Imported Upstream version 1.8.0upstream/1.8.0

73 files changed, 4074 insertions, 2421 deletions

diff --git a/builtin/add.c b/builtin/add.c
index b79336d7..e664100c 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -16,7 +16,7 @@
 #include "bulk-checkin.h"
 
 static const char * const builtin_add_usage[] = {
-	"git add [options] [--] <filepattern>...",
+	N_("git add [options] [--] <filepattern>..."),
 	NULL
 };
 static int patch_interactive, add_interactive, edit_interactive;
@@ -260,7 +260,7 @@ int interactive_add(int argc, const char **argv, const char *prefix, int patch)
 
 static int edit_patch(int argc, const char **argv, const char *prefix)
 {
-	char *file = xstrdup(git_path("ADD_EDIT.patch"));
+	char *file = git_pathdup("ADD_EDIT.patch");
 	const char *apply_argv[] = { "apply", "--recount", "--cached",
 		NULL, NULL };
 	struct child_process child;
@@ -281,7 +281,7 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 	argc = setup_revisions(argc, argv, &rev, NULL);
 	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
 	DIFF_OPT_SET(&rev.diffopt, IGNORE_DIRTY_SUBMODULES);
-	out = open(file, O_CREAT | O_WRONLY, 0644);
+	out = open(file, O_CREAT | O_WRONLY, 0666);
 	if (out < 0)
 		die (_("Could not open '%s' for writing."), file);
 	rev.diffopt.file = xfdopen(out, "w");
@@ -303,6 +303,7 @@ static int edit_patch(int argc, const char **argv, const char *prefix)
 		die (_("Could not apply '%s'"), file);
 
 	unlink(file);
+	free(file);
 	return 0;
 }
 
@@ -315,19 +316,19 @@ static int verbose = 0, show_only = 0, ignored_too = 0, refresh_only = 0;
 static int ignore_add_errors, addremove, intent_to_add, ignore_missing = 0;
 
 static struct option builtin_add_options[] = {
-	OPT__DRY_RUN(&show_only, "dry run"),
-	OPT__VERBOSE(&verbose, "be verbose"),
+	OPT__DRY_RUN(&show_only, N_("dry run")),
+	OPT__VERBOSE(&verbose, N_("be verbose")),
 	OPT_GROUP(""),
-	OPT_BOOLEAN('i', "interactive", &add_interactive, "interactive picking"),
-	OPT_BOOLEAN('p', "patch", &patch_interactive, "select hunks interactively"),
-	OPT_BOOLEAN('e', "edit", &edit_interactive, "edit current diff and apply"),
-	OPT__FORCE(&ignored_too, "allow adding otherwise ignored files"),
-	OPT_BOOLEAN('u', "update", &take_worktree_changes, "update tracked files"),
-	OPT_BOOLEAN('N', "intent-to-add", &intent_to_add, "record only the fact that the path will be added later"),
-	OPT_BOOLEAN('A', "all", &addremove, "add changes from all tracked and untracked files"),
-	OPT_BOOLEAN( 0 , "refresh", &refresh_only, "don't add, only refresh the index"),
-	OPT_BOOLEAN( 0 , "ignore-errors", &ignore_add_errors, "just skip files which cannot be added because of errors"),
-	OPT_BOOLEAN( 0 , "ignore-missing", &ignore_missing, "check if - even missing - files are ignored in dry run"),
+	OPT_BOOLEAN('i', "interactive", &add_interactive, N_("interactive picking")),
+	OPT_BOOLEAN('p', "patch", &patch_interactive, N_("select hunks interactively")),
+	OPT_BOOLEAN('e', "edit", &edit_interactive, N_("edit current diff and apply")),
+	OPT__FORCE(&ignored_too, N_("allow adding otherwise ignored files")),
+	OPT_BOOLEAN('u', "update", &take_worktree_changes, N_("update tracked files")),
+	OPT_BOOLEAN('N', "intent-to-add", &intent_to_add, N_("record only the fact that the path will be added later")),
+	OPT_BOOLEAN('A', "all", &addremove, N_("add changes from all tracked and untracked files")),
+	OPT_BOOLEAN( 0 , "refresh", &refresh_only, N_("don't add, only refresh the index")),
+	OPT_BOOLEAN( 0 , "ignore-errors", &ignore_add_errors, N_("just skip files which cannot be added because of errors")),
+	OPT_BOOLEAN( 0 , "ignore-missing", &ignore_missing, N_("check if - even missing - files are ignored in dry run")),
 	OPT_END(),
 };
 
@@ -443,6 +444,9 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 
 	if (pathspec) {
 		int i;
+		struct path_exclude_check check;
+
+		path_exclude_check_init(&check, &dir);
 		if (!seen)
 			seen = find_used_pathspec(pathspec);
 		for (i = 0; pathspec[i]; i++) {
@@ -450,7 +454,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			    && !file_exists(pathspec[i])) {
 				if (ignore_missing) {
 					int dtype = DT_UNKNOWN;
-					if (excluded(&dir, pathspec[i], &dtype))
+					if (path_excluded(&check, pathspec[i], -1, &dtype))
 						dir_add_ignored(&dir, pathspec[i], strlen(pathspec[i]));
 				} else
 					die(_("pathspec '%s' did not match any files"),
@@ -458,6 +462,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			}
 		}
 		free(seen);
+		path_exclude_check_clear(&check);
 	}
 
 	plug_bulk_checkin();
diff --git a/builtin/apply.c b/builtin/apply.c
index 389898f1..156b3ce3 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -16,6 +16,9 @@
 #include "dir.h"
 #include "diff.h"
 #include "parse-options.h"
+#include "xdiff-interface.h"
+#include "ll-merge.h"
+#include "rerere.h"
 
 /*
  *  --check turns on checking that the working tree matches the
@@ -46,11 +49,12 @@ static int apply_with_reject;
 static int apply_verbosely;
 static int allow_overlap;
 static int no_add;
+static int threeway;
 static const char *fake_ancestor;
 static int line_termination = '\n';
 static unsigned int p_context = UINT_MAX;
 static const char * const apply_usage[] = {
-	"git apply [options] [<patch>...]",
+	N_("git apply [options] [<patch>...]"),
 	NULL
 };
 
@@ -103,7 +107,7 @@ static void parse_whitespace_option(const char *option)
 		ws_error_action = correct_ws_error;
 		return;
 	}
-	die("unrecognized whitespace option '%s'", option);
+	die(_("unrecognized whitespace option '%s'"), option);
 }
 
 static void parse_ignorewhitespace_option(const char *option)
@@ -118,7 +122,7 @@ static void parse_ignorewhitespace_option(const char *option)
 		ws_ignore_action = ignore_ws_change;
 		return;
 	}
-	die("unrecognized whitespace ignore option '%s'", option);
+	die(_("unrecognized whitespace ignore option '%s'"), option);
 }
 
 static void set_default_whitespace_mode(const char *whitespace_option)
@@ -152,9 +156,14 @@ struct fragment {
 	unsigned long leading, trailing;
 	unsigned long oldpos, oldlines;
 	unsigned long newpos, newlines;
+	/*
+	 * 'patch' is usually borrowed from buf in apply_patch(),
+	 * but some codepaths store an allocated buffer.
+	 */
 	const char *patch;
+	unsigned free_patch:1,
+		rejected:1;
 	int size;
-	int rejected;
 	int linenr;
 	struct fragment *next;
 };
@@ -179,7 +188,6 @@ struct patch {
 	int is_new, is_delete;	/* -1 = unknown, 0 = false, 1 = true */
 	int rejected;
 	unsigned ws_rule;
-	unsigned long deflate_origlen;
 	int lines_added, lines_deleted;
 	int score;
 	unsigned int is_toplevel_relative:1;
@@ -188,14 +196,49 @@ struct patch {
 	unsigned int is_copy:1;
 	unsigned int is_rename:1;
 	unsigned int recount:1;
+	unsigned int conflicted_threeway:1;
+	unsigned int direct_to_threeway:1;
 	struct fragment *fragments;
 	char *result;
 	size_t resultsize;
 	char old_sha1_prefix[41];
 	char new_sha1_prefix[41];
 	struct patch *next;
+
+	/* three-way fallback result */
+	unsigned char threeway_stage[3][20];
 };
 
+static void free_fragment_list(struct fragment *list)
+{
+	while (list) {
+		struct fragment *next = list->next;
+		if (list->free_patch)
+			free((char *)list->patch);
+		free(list);
+		list = next;
+	}
+}
+
+static void free_patch(struct patch *patch)
+{
+	free_fragment_list(patch->fragments);
+	free(patch->def_name);
+	free(patch->old_name);
+	free(patch->new_name);
+	free(patch->result);
+	free(patch);
+}
+
+static void free_patch_list(struct patch *list)
+{
+	while (list) {
+		struct patch *next = list->next;
+		free_patch(list);
+		list = next;
+	}
+}
+
 /*
  * A line in a file, len-bytes long (includes the terminating LF,
  * except for an incomplete line at the end if the file ends with
@@ -302,6 +345,11 @@ static void add_line_info(struct image *img, const char *bol, size_t len, unsign
 	img->nr++;
 }
 
+/*
+ * "buf" has the file contents to be patched (read from various sources).
+ * attach it to "image" and add line-based index to it.
+ * "image" now owns the "buf".
+ */
 static void prepare_image(struct image *image, char *buf, size_t len,
 			  int prepare_linetable)
 {
@@ -331,29 +379,31 @@ static void prepare_image(struct image *image, char *buf, size_t len,
 static void clear_image(struct image *image)
 {
 	free(image->buf);
-	image->buf = NULL;
-	image->len = 0;
+	free(image->line_allocated);
+	memset(image, 0, sizeof(*image));
 }
 
-static void say_patch_name(FILE *output, const char *pre,
-			   struct patch *patch, const char *post)
+/* fmt must contain _one_ %s and no other substitution */
+static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
 {
-	fputs(pre, output);
+	struct strbuf sb = STRBUF_INIT;
+
 	if (patch->old_name && patch->new_name &&
 	    strcmp(patch->old_name, patch->new_name)) {
-		quote_c_style(patch->old_name, NULL, output, 0);
-		fputs(" => ", output);
-		quote_c_style(patch->new_name, NULL, output, 0);
+		quote_c_style(patch->old_name, &sb, NULL, 0);
+		strbuf_addstr(&sb, " => ");
+		quote_c_style(patch->new_name, &sb, NULL, 0);
 	} else {
 		const char *n = patch->new_name;
 		if (!n)
 			n = patch->old_name;
-		quote_c_style(n, NULL, output, 0);
+		quote_c_style(n, &sb, NULL, 0);
 	}
-	fputs(post, output);
+	fprintf(output, fmt, sb.buf);
+	fputc('\n', output);
+	strbuf_release(&sb);
 }
 
-#define CHUNKSIZE (8192)
 #define SLOP (16)
 
 static void read_patch_file(struct strbuf *sb, int fd)
@@ -416,7 +466,7 @@ static char *squash_slash(char *name)
 	return name;
 }
 
-static char *find_name_gnu(const char *line, char *def, int p_value)
+static char *find_name_gnu(const char *line, const char *def, int p_value)
 {
 	struct strbuf name = STRBUF_INIT;
 	char *cp;
@@ -439,11 +489,7 @@ static char *find_name_gnu(const char *line, char *def, int p_value)
 		cp++;
 	}
 
-	/* name can later be freed, so we need
-	 * to memmove, not just return cp
-	 */
 	strbuf_remove(&name, 0, cp - name.buf);
-	free(def);
 	if (root)
 		strbuf_insert(&name, 0, root, root_len);
 	return squash_slash(strbuf_detach(&name, NULL));
@@ -608,8 +654,13 @@ static size_t diff_timestamp_len(const char *line, size_t len)
 	return line + len - end;
 }
 
-static char *find_name_common(const char *line, char *def, int p_value,
-				const char *end, int terminate)
+static char *null_strdup(const char *s)
+{
+	return s ? xstrdup(s) : NULL;
+}
+
+static char *find_name_common(const char *line, const char *def,
+			      int p_value, const char *end, int terminate)
 {
 	int len;
 	const char *start = NULL;
@@ -630,10 +681,10 @@ static char *find_name_common(const char *line, char *def, int p_value,
 			start = line;
 	}
 	if (!start)
-		return squash_slash(def);
+		return squash_slash(null_strdup(def));
 	len = line - start;
 	if (!len)
-		return squash_slash(def);
+		return squash_slash(null_strdup(def));
 
 	/*
 	 * Generally we prefer the shorter name, especially
@@ -644,8 +695,7 @@ static char *find_name_common(const char *line, char *def, int p_value,
 	if (def) {
 		int deflen = strlen(def);
 		if (deflen < len && !strncmp(start, def, deflen))
-			return squash_slash(def);
-		free(def);
+			return squash_slash(xstrdup(def));
 	}
 
 	if (root) {
@@ -770,7 +820,7 @@ static int has_epoch_timestamp(const char *nameline)
 	if (!stamp) {
 		stamp = xmalloc(sizeof(*stamp));
 		if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
-			warning("Cannot prepare timestamp regexp %s",
+			warning(_("Cannot prepare timestamp regexp %s"),
 				stamp_regexp);
 			return 0;
 		}
@@ -779,7 +829,7 @@ static int has_epoch_timestamp(const char *nameline)
 	status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
 	if (status) {
 		if (status != REG_NOMATCH)
-			warning("regexec returned %d for input: %s",
+			warning(_("regexec returned %d for input: %s"),
 				status, timestamp);
 		return 0;
 	}
@@ -842,8 +892,10 @@ static void parse_traditional_patch(const char *first, const char *second, struc
 		name = find_name_traditional(first, NULL, p_value);
 		patch->old_name = name;
 	} else {
-		name = find_name_traditional(first, NULL, p_value);
-		name = find_name_traditional(second, name, p_value);
+		char *first_name;
+		first_name = find_name_traditional(first, NULL, p_value);
+		name = find_name_traditional(second, first_name, p_value);
+		free(first_name);
 		if (has_epoch_timestamp(first)) {
 			patch->is_new = 1;
 			patch->is_delete = 0;
@@ -853,11 +905,12 @@ static void parse_traditional_patch(const char *first, const char *second, struc
 			patch->is_delete = 1;
 			patch->old_name = name;
 		} else {
-			patch->old_name = patch->new_name = name;
+			patch->old_name = name;
+			patch->new_name = xstrdup(name);
 		}
 	}
 	if (!name)
-		die("unable to find filename in patch at line %d", linenr);
+		die(_("unable to find filename in patch at line %d"), linenr);
 }
 
 static int gitdiff_hdrend(const char *line, struct patch *patch)
@@ -874,7 +927,10 @@ static int gitdiff_hdrend(const char *line, struct patch *patch)
  * their names against any previous information, just
  * to make sure..
  */
-static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
+#define DIFF_OLD_NAME 0
+#define DIFF_NEW_NAME 1
+
+static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, int side)
 {
 	if (!orig_name && !isnull)
 		return find_name(line, NULL, p_value, TERM_TAB);
@@ -886,30 +942,40 @@ static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name,
 		name = orig_name;
 		len = strlen(name);
 		if (isnull)
-			die("git apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
+			die(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"), name, linenr);
 		another = find_name(line, NULL, p_value, TERM_TAB);
 		if (!another || memcmp(another, name, len + 1))
-			die("git apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
+			die((side == DIFF_NEW_NAME) ?
+			    _("git apply: bad git-diff - inconsistent new filename on line %d") :
+			    _("git apply: bad git-diff - inconsistent old filename on line %d"), linenr);
 		free(another);
 		return orig_name;
 	}
 	else {
 		/* expect "/dev/null" */
 		if (memcmp("/dev/null", line, 9) || line[9] != '\n')
-			die("git apply: bad git-diff - expected /dev/null on line %d", linenr);
+			die(_("git apply: bad git-diff - expected /dev/null on line %d"), linenr);
 		return NULL;
 	}
 }
 
 static int gitdiff_oldname(const char *line, struct patch *patch)
 {
-	patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name, "old");
+	char *orig = patch->old_name;
+	patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name,
+					      DIFF_OLD_NAME);
+	if (orig != patch->old_name)
+		free(orig);
 	return 0;
 }
 
 static int gitdiff_newname(const char *line, struct patch *patch)
 {
-	patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name, "new");
+	char *orig = patch->new_name;
+	patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name,
+					      DIFF_NEW_NAME);
+	if (orig != patch->new_name)
+		free(orig);
 	return 0;
 }
 
@@ -928,20 +994,23 @@ static int gitdiff_newmode(const char *line, struct patch *patch)
 static int gitdiff_delete(const char *line, struct patch *patch)
 {
 	patch->is_delete = 1;
-	patch->old_name = patch->def_name;
+	free(patch->old_name);
+	patch->old_name = null_strdup(patch->def_name);
 	return gitdiff_oldmode(line, patch);
 }
 
 static int gitdiff_newfile(const char *line, struct patch *patch)
 {
 	patch->is_new = 1;
-	patch->new_name = patch->def_name;
+	free(patch->new_name);
+	patch->new_name = null_strdup(patch->def_name);
 	return gitdiff_newmode(line, patch);
 }
 
 static int gitdiff_copysrc(const char *line, struct patch *patch)
 {
 	patch->is_copy = 1;
+	free(patch->old_name);
 	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
@@ -949,6 +1018,7 @@ static int gitdiff_copysrc(const char *line, struct patch *patch)
 static int gitdiff_copydst(const char *line, struct patch *patch)
 {
 	patch->is_copy = 1;
+	free(patch->new_name);
 	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
@@ -956,6 +1026,7 @@ static int gitdiff_copydst(const char *line, struct patch *patch)
 static int gitdiff_renamesrc(const char *line, struct patch *patch)
 {
 	patch->is_rename = 1;
+	free(patch->old_name);
 	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
@@ -963,6 +1034,7 @@ static int gitdiff_renamesrc(const char *line, struct patch *patch)
 static int gitdiff_renamedst(const char *line, struct patch *patch)
 {
 	patch->is_rename = 1;
+	free(patch->new_name);
 	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
 	return 0;
 }
@@ -1023,15 +1095,23 @@ static int gitdiff_unrecognized(const char *line, struct patch *patch)
 	return -1;
 }
 
-static const char *stop_at_slash(const char *line, int llen)
+/*
+ * Skip p_value leading components from "line"; as we do not accept
+ * absolute paths, return NULL in that case.
+ */
+static const char *skip_tree_prefix(const char *line, int llen)
 {
-	int nslash = p_value;
+	int nslash;
 	int i;
 
+	if (!p_value)
+		return (llen && line[0] == '/') ? NULL : line;
+
+	nslash = p_value;
 	for (i = 0; i < llen; i++) {
 		int ch = line[i];
 		if (ch == '/' && --nslash <= 0)
-			return &line[i];
+			return (i == 0) ? NULL : &line[i + 1];
 	}
 	return NULL;
 }
@@ -1044,7 +1124,7 @@ static const char *stop_at_slash(const char *line, int llen)
  * creation or deletion of an empty file.  In any of these cases,
  * both sides are the same name under a/ and b/ respectively.
  */
-static char *git_header_name(char *line, int llen)
+static char *git_header_name(const char *line, int llen)
 {
 	const char *name;
 	const char *second = NULL;
@@ -1061,12 +1141,11 @@ static char *git_header_name(char *line, int llen)
 		if (unquote_c_style(&first, line, &second))
 			goto free_and_fail1;
 
-		/* advance to the first slash */
-		cp = stop_at_slash(first.buf, first.len);
-		/* we do not accept absolute paths */
-		if (!cp || cp == first.buf)
+		/* strip the a/b prefix including trailing slash */
+		cp = skip_tree_prefix(first.buf, first.len);
+		if (!cp)
 			goto free_and_fail1;
-		strbuf_remove(&first, 0, cp + 1 - first.buf);
+		strbuf_remove(&first, 0, cp - first.buf);
 
 		/*
 		 * second points at one past closing dq of name.
@@ -1080,22 +1159,21 @@ static char *git_header_name(char *line, int llen)
 		if (*second == '"') {
 			if (unquote_c_style(&sp, second, NULL))
 				goto free_and_fail1;
-			cp = stop_at_slash(sp.buf, sp.len);
-			if (!cp || cp == sp.buf)
+			cp = skip_tree_prefix(sp.buf, sp.len);
+			if (!cp)
 				goto free_and_fail1;
 			/* They must match, otherwise ignore */
-			if (strcmp(cp + 1, first.buf))
+			if (strcmp(cp, first.buf))
 				goto free_and_fail1;
 			strbuf_release(&sp);
 			return strbuf_detach(&first, NULL);
 		}
 
 		/* unquoted second */
-		cp = stop_at_slash(second, line + llen - second);
-		if (!cp || cp == second)
+		cp = skip_tree_prefix(second, line + llen - second);
+		if (!cp)
 			goto free_and_fail1;
-		cp++;
-		if (line + llen - cp != first.len + 1 ||
+		if (line + llen - cp != first.len ||
 		    memcmp(first.buf, cp, first.len))
 			goto free_and_fail1;
 		return strbuf_detach(&first, NULL);
@@ -1107,10 +1185,9 @@ static char *git_header_name(char *line, int llen)
 	}
 
 	/* unquoted first name */
-	name = stop_at_slash(line, llen);
-	if (!name || name == line)
+	name = skip_tree_prefix(line, llen);
+	if (!name)
 		return NULL;
-	name++;
 
 	/*
 	 * since the first name is unquoted, a dq if exists must be
@@ -1124,10 +1201,9 @@ static char *git_header_name(char *line, int llen)
 			if (unquote_c_style(&sp, second, NULL))
 				goto free_and_fail2;
 
-			np = stop_at_slash(sp.buf, sp.len);
-			if (!np || np == sp.buf)
+			np = skip_tree_prefix(sp.buf, sp.len);
+			if (!np)
 				goto free_and_fail2;
-			np++;
 
 			len = sp.buf + sp.len - np;
 			if (len < second - name &&
@@ -1159,19 +1235,33 @@ static char *git_header_name(char *line, int llen)
 		case '\n':
 			return NULL;
 		case '\t': case ' ':
-			second = stop_at_slash(name + len, line_len - len);
+			/*
+			 * Is this the separator between the preimage
+			 * and the postimage pathname?  Again, we are
+			 * only interested in the case where there is
+			 * no rename, as this is only to set def_name
+			 * and a rename patch has the names elsewhere
+			 * in an unambiguous form.
+			 */
+			if (!name[len + 1])
+				return NULL; /* no postimage name */
+			second = skip_tree_prefix(name + len + 1,
+						  line_len - (len + 1));
 			if (!second)
 				return NULL;
-			second++;
-			if (second[len] == '\n' && !strncmp(name, second, len)) {
+			/*
+			 * Does len bytes starting at "name" and "second"
+			 * (that are separated by one HT or SP we just
+			 * found) exactly match?
+			 */
+			if (second[len] == '\n' && !strncmp(name, second, len))
 				return xmemdupz(name, len);
-			}
 		}
 	}
 }
 
 /* Verify that we recognize the lines following a git header */
-static int parse_git_header(char *line, int len, unsigned int size, struct patch *patch)
+static int parse_git_header(const char *line, int len, unsigned int size, struct patch *patch)
 {
 	unsigned long offset;
 
@@ -1287,7 +1377,7 @@ static int parse_range(const char *line, int len, int offset, const char *expect
 	return offset + ex;
 }
 
-static void recount_diff(char *line, int size, struct fragment *fragment)
+static void recount_diff(const char *line, int size, struct fragment *fragment)
 {
 	int oldlines = 0, newlines = 0, ret = 0;
 
@@ -1327,7 +1417,7 @@ static void recount_diff(char *line, int size, struct fragment *fragment)
 			break;
 		}
 		if (ret) {
-			warning("recount: unexpected line: %.*s",
+			warning(_("recount: unexpected line: %.*s"),
 				(int)linelen(line, size), line);
 			return;
 		}
@@ -1341,7 +1431,7 @@ static void recount_diff(char *line, int size, struct fragment *fragment)
  * Parse a unified diff fragment header of the
  * form "@@ -a,b +c,d @@"
  */
-static int parse_fragment_header(char *line, int len, struct fragment *fragment)
+static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
 {
 	int offset;
 
@@ -1355,7 +1445,7 @@ static int parse_fragment_header(char *line, int len, struct fragment *fragment)
 	return offset;
 }
 
-static int find_header(char *line, unsigned long size, int *hdrsize, struct patch *patch)
+static int find_header(const char *line, unsigned long size, int *hdrsize, struct patch *patch)
 {
 	unsigned long offset, len;
 
@@ -1384,7 +1474,7 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
 			struct fragment dummy;
 			if (parse_fragment_header(line, len, &dummy) < 0)
 				continue;
-			die("patch fragment without header at line %d: %.*s",
+			die(_("patch fragment without header at line %d: %.*s"),
 			    linenr, (int)len-1, line);
 		}
 
@@ -1401,9 +1491,14 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
 				continue;
 			if (!patch->old_name && !patch->new_name) {
 				if (!patch->def_name)
-					die("git diff header lacks filename information when removing "
-					    "%d leading pathname components (line %d)" , p_value, linenr);
-				patch->old_name = patch->new_name = patch->def_name;
+					die(Q_("git diff header lacks filename information when removing "
+					       "%d leading pathname component (line %d)",
+					       "git diff header lacks filename information when removing "
+					       "%d leading pathname components (line %d)",
+					       p_value),
+					    p_value, linenr);
+				patch->old_name = xstrdup(patch->def_name);
+				patch->new_name = xstrdup(patch->def_name);
 			}
 			if (!patch->is_delete && !patch->new_name)
 				die("git diff header lacks filename information "
@@ -1466,7 +1561,7 @@ static void check_whitespace(const char *line, int len, unsigned ws_rule)
  * between a "---" that is part of a patch, and a "---" that starts
  * the next patch is to look at the line counts..
  */
-static int parse_fragment(char *line, unsigned long size,
+static int parse_fragment(const char *line, unsigned long size,
 			  struct patch *patch, struct fragment *fragment)
 {
 	int added, deleted;
@@ -1556,13 +1651,21 @@ static int parse_fragment(char *line, unsigned long size,
 	patch->lines_deleted += deleted;
 
 	if (0 < patch->is_new && oldlines)
-		return error("new file depends on old contents");
+		return error(_("new file depends on old contents"));
 	if (0 < patch->is_delete && newlines)
-		return error("deleted file still has contents");
+		return error(_("deleted file still has contents"));
 	return offset;
 }
 
-static int parse_single_patch(char *line, unsigned long size, struct patch *patch)
+/*
+ * We have seen "diff --git a/... b/..." header (or a traditional patch
+ * header).  Read hunks that belong to this patch into fragments and hang
+ * them to the given patch structure.
+ *
+ * The (fragment->patch, fragment->size) pair points into the memory given
+ * by the caller, not a copy, when we return.
+ */
+static int parse_single_patch(const char *line, unsigned long size, struct patch *patch)
 {
 	unsigned long offset = 0;
 	unsigned long oldlines = 0, newlines = 0, context = 0;
@@ -1576,7 +1679,7 @@ static int parse_single_patch(char *line, unsigned long size, struct patch *patc
 		fragment->linenr = linenr;
 		len = parse_fragment(line, size, patch, fragment);
 		if (len <= 0)
-			die("corrupt patch at line %d", linenr);
+			die(_("corrupt patch at line %d"), linenr);
 		fragment->patch = line;
 		fragment->size = len;
 		oldlines += fragment->oldlines;
@@ -1612,12 +1715,14 @@ static int parse_single_patch(char *line, unsigned long size, struct patch *patc
 		patch->is_delete = 0;
 
 	if (0 < patch->is_new && oldlines)
-		die("new file %s depends on old contents", patch->new_name);
+		die(_("new file %s depends on old contents"), patch->new_name);
 	if (0 < patch->is_delete && newlines)
-		die("deleted file %s still has contents", patch->old_name);
+		die(_("deleted file %s still has contents"), patch->old_name);
 	if (!patch->is_delete && !newlines && context)
-		fprintf(stderr, "** warning: file %s becomes empty but "
-			"is not deleted\n", patch->new_name);
+		fprintf_ln(stderr,
+			   _("** warning: "
+			     "file %s becomes empty but is not deleted"),
+			   patch->new_name);
 
 	return offset;
 }
@@ -1655,6 +1760,11 @@ static char *inflate_it(const void *data, unsigned long size,
 	return out;
 }
 
+/*
+ * Read a binary hunk and return a new fragment; fragment->patch
+ * points at an allocated memory that the caller must free, so
+ * it is marked as "->free_patch = 1".
+ */
 static struct fragment *parse_binary_hunk(char **buf_p,
 					  unsigned long *sz_p,
 					  int *status_p,
@@ -1742,6 +1852,7 @@ static struct fragment *parse_binary_hunk(char **buf_p,
 
 	frag = xcalloc(1, sizeof(*frag));
 	frag->patch = inflate_it(data, hunk_size, origlen);
+	frag->free_patch = 1;
 	if (!frag->patch)
 		goto corrupt;
 	free(data);
@@ -1755,7 +1866,7 @@ static struct fragment *parse_binary_hunk(char **buf_p,
  corrupt:
 	free(data);
 	*status_p = -1;
-	error("corrupt binary patch at line %d: %.*s",
+	error(_("corrupt binary patch at line %d: %.*s"),
 	      linenr-1, llen-1, buffer);
 	return NULL;
 }
@@ -1784,7 +1895,7 @@ static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
 	forward = parse_binary_hunk(&buffer, &size, &status, &used);
 	if (!forward && !status)
 		/* there has to be one hunk (forward hunk) */
-		return error("unrecognized binary patch at line %d", linenr-1);
+		return error(_("unrecognized binary patch at line %d"), linenr-1);
 	if (status)
 		/* otherwise we already gave an error message */
 		return status;
@@ -1807,6 +1918,13 @@ static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
 	return used;
 }
 
+/*
+ * Read the patch text in "buffer" taht extends for "size" bytes; stop
+ * reading after seeing a single patch (i.e. changes to a single file).
+ * Create fragments (i.e. patch hunks) and hang them to the given patch.
+ * Return the number of bytes consumed, so that the caller can call us
+ * again for the next patch.
+ */
 static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 {
 	int hdrsize, patchsize;
@@ -1863,7 +1981,7 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
 		 */
 		if ((apply || check) &&
 		    (!patch->is_binary && !metadata_changes(patch)))
-			die("patch with only garbage at line %d", linenr);
+			die(_("patch with only garbage at line %d"), linenr);
 	}
 
 	return offset + hdrsize + patchsize;
@@ -1953,11 +2071,11 @@ static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
 	switch (st->st_mode & S_IFMT) {
 	case S_IFLNK:
 		if (strbuf_readlink(buf, path, st->st_size) < 0)
-			return error("unable to read symlink %s", path);
+			return error(_("unable to read symlink %s"), path);
 		return 0;
 	case S_IFREG:
 		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
-			return error("unable to open or read %s", path);
+			return error(_("unable to open or read %s"), path);
 		convert_to_git(path, buf->buf, buf->len, buf, 0);
 		return 0;
 	default:
@@ -2028,7 +2146,7 @@ static void update_pre_post_images(struct image *preimage,
 			ctx++;
 		}
 		if (preimage->nr <= ctx)
-			die("oops");
+			die(_("oops"));
 
 		/* and copy it in, while fixing the line length */
 		len = preimage->line[ctx].len;
@@ -2367,6 +2485,11 @@ static void remove_last_line(struct image *img)
 	img->len -= img->line[--img->nr].len;
 }
 
+/*
+ * The change from "preimage" and "postimage" has been found to
+ * apply at applied_pos (counts in line numbers) in "img".
+ * Update "img" to remove "preimage" and replace it with "postimage".
+ */
 static void update_image(struct image *img,
 			 int applied_pos,
 			 struct image *preimage,
@@ -2438,6 +2561,11 @@ static void update_image(struct image *img,
 	img->nr = nr;
 }
 
+/*
+ * Use the patch-hunk text in "frag" to prepare two images (preimage and
+ * postimage) for the hunk.  Find lines that match "preimage" in "img" and
+ * replace the part of "img" with "postimage" text.
+ */
 static int apply_one_fragment(struct image *img, struct fragment *frag,
 			      int inaccurate_eof, unsigned ws_rule,
 			      int nth_fragment)
@@ -2540,7 +2668,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 			break;
 		default:
 			if (apply_verbosely)
-				error("invalid start of line: '%c'", first);
+				error(_("invalid start of line: '%c'"), first);
 			return -1;
 		}
 		if (added_blank_line) {
@@ -2657,9 +2785,11 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 			int offset = applied_pos - pos;
 			if (apply_in_reverse)
 				offset = 0 - offset;
-			fprintf(stderr,
-				"Hunk #%d succeeded at %d (offset %d lines).\n",
-				nth_fragment, applied_pos + 1, offset);
+			fprintf_ln(stderr,
+				   Q_("Hunk #%d succeeded at %d (offset %d line).",
+				      "Hunk #%d succeeded at %d (offset %d lines).",
+				      offset),
+				   nth_fragment, applied_pos + 1, offset);
 		}
 
 		/*
@@ -2668,13 +2798,13 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 		 */
 		if ((leading != frag->leading) ||
 		    (trailing != frag->trailing))
-			fprintf(stderr, "Context reduced to (%ld/%ld)"
-				" to apply fragment at %d\n",
-				leading, trailing, applied_pos+1);
+			fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
+					     " to apply fragment at %d"),
+				   leading, trailing, applied_pos+1);
 		update_image(img, applied_pos, &preimage, &postimage);
 	} else {
 		if (apply_verbosely)
-			error("while searching for:\n%.*s",
+			error(_("while searching for:\n%.*s"),
 			      (int)(old - oldlines), oldlines);
 	}
 
@@ -2693,7 +2823,7 @@ static int apply_binary_fragment(struct image *img, struct patch *patch)
 	void *dst;
 
 	if (!fragment)
-		return error("missing binary patch data for '%s'",
+		return error(_("missing binary patch data for '%s'"),
 			     patch->new_name ?
 			     patch->new_name :
 			     patch->old_name);
@@ -2728,6 +2858,12 @@ static int apply_binary_fragment(struct image *img, struct patch *patch)
 	return -1;
 }
 
+/*
+ * Replace "img" with the result of applying the binary patch.
+ * The binary patch data itself in patch->fragment is still kept
+ * but the preimage prepared by the caller in "img" is freed here
+ * or in the helper function apply_binary_fragment() this calls.
+ */
 static int apply_binary(struct image *img, struct patch *patch)
 {
 	const char *name = patch->old_name ? patch->old_name : patch->new_name;
@@ -2790,13 +2926,13 @@ static int apply_binary(struct image *img, struct patch *patch)
 		 * in the patch->fragments->{patch,size}.
 		 */
 		if (apply_binary_fragment(img, patch))
-			return error("binary patch does not apply to '%s'",
+			return error(_("binary patch does not apply to '%s'"),
 				     name);
 
 		/* verify that the result matches */
 		hash_sha1_file(img->buf, img->len, blob_type, sha1);
 		if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
-			return error("binary patch to '%s' creates incorrect result (expecting %s, got %s)",
+			return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
 				name, patch->new_sha1_prefix, sha1_to_hex(sha1));
 	}
 
@@ -2817,7 +2953,7 @@ static int apply_fragments(struct image *img, struct patch *patch)
 	while (frag) {
 		nth++;
 		if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule, nth)) {
-			error("patch failed: %s:%ld", name, frag->oldpos);
+			error(_("patch failed: %s:%ld"), name, frag->oldpos);
 			if (!apply_with_reject)
 				return -1;
 			frag->rejected = 1;
@@ -2827,20 +2963,17 @@ static int apply_fragments(struct image *img, struct patch *patch)
 	return 0;
 }
 
-static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
+static int read_blob_object(struct strbuf *buf, const unsigned char *sha1, unsigned mode)
 {
-	if (!ce)
-		return 0;
-
-	if (S_ISGITLINK(ce->ce_mode)) {
+	if (S_ISGITLINK(mode)) {
 		strbuf_grow(buf, 100);
-		strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(ce->sha1));
+		strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(sha1));
 	} else {
 		enum object_type type;
 		unsigned long sz;
 		char *result;
 
-		result = read_sha1_file(ce->sha1, &type, &sz);
+		result = read_sha1_file(sha1, &type, &sz);
 		if (!result)
 			return -1;
 		/* XXX read_sha1_file NUL-terminates */
@@ -2849,6 +2982,13 @@ static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
 	return 0;
 }
 
+static int read_file_or_gitlink(struct cache_entry *ce, struct strbuf *buf)
+{
+	if (!ce)
+		return 0;
+	return read_blob_object(buf, ce->sha1, ce->ce_mode);
+}
+
 static struct patch *in_fn_table(const char *name)
 {
 	struct string_list_item *item;
@@ -2867,9 +3007,15 @@ static struct patch *in_fn_table(const char *name)
  * item->util in the filename table records the status of the path.
  * Usually it points at a patch (whose result records the contents
  * of it after applying it), but it could be PATH_WAS_DELETED for a
- * path that a previously applied patch has already removed.
+ * path that a previously applied patch has already removed, or
+ * PATH_TO_BE_DELETED for a path that a later patch would remove.
+ *
+ * The latter is needed to deal with a case where two paths A and B
+ * are swapped by first renaming A to B and then renaming B to A;
+ * moving A to B should not be prevented due to presense of B as we
+ * will remove it in a later patch.
  */
- #define PATH_TO_BE_DELETED ((struct patch *) -2)
+#define PATH_TO_BE_DELETED ((struct patch *) -2)
 #define PATH_WAS_DELETED ((struct patch *) -1)
 
 static int to_be_deleted(struct patch *patch)
@@ -2921,152 +3067,346 @@ static void prepare_fn_table(struct patch *patch)
 	}
 }
 
-static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
+static int checkout_target(struct cache_entry *ce, struct stat *st)
+{
+	struct checkout costate;
+
+	memset(&costate, 0, sizeof(costate));
+	costate.base_dir = "";
+	costate.refresh_cache = 1;
+	if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
+		return error(_("cannot checkout %s"), ce->name);
+	return 0;
+}
+
+static struct patch *previous_patch(struct patch *patch, int *gone)
+{
+	struct patch *previous;
+
+	*gone = 0;
+	if (patch->is_copy || patch->is_rename)
+		return NULL; /* "git" patches do not depend on the order */
+
+	previous = in_fn_table(patch->old_name);
+	if (!previous)
+		return NULL;
+
+	if (to_be_deleted(previous))
+		return NULL; /* the deletion hasn't happened yet */
+
+	if (was_deleted(previous))
+		*gone = 1;
+
+	return previous;
+}
+
+static int verify_index_match(struct cache_entry *ce, struct stat *st)
+{
+	if (S_ISGITLINK(ce->ce_mode)) {
+		if (!S_ISDIR(st->st_mode))
+			return -1;
+		return 0;
+	}
+	return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
+}
+
+#define SUBMODULE_PATCH_WITHOUT_INDEX 1
+
+static int load_patch_target(struct strbuf *buf,
+			     struct cache_entry *ce,
+			     struct stat *st,
+			     const char *name,
+			     unsigned expected_mode)
+{
+	if (cached) {
+		if (read_file_or_gitlink(ce, buf))
+			return error(_("read of %s failed"), name);
+	} else if (name) {
+		if (S_ISGITLINK(expected_mode)) {
+			if (ce)
+				return read_file_or_gitlink(ce, buf);
+			else
+				return SUBMODULE_PATCH_WITHOUT_INDEX;
+		} else {
+			if (read_old_data(st, name, buf))
+				return error(_("read of %s failed"), name);
+		}
+	}
+	return 0;
+}
+
+/*
+ * We are about to apply "patch"; populate the "image" with the
+ * current version we have, from the working tree or from the index,
+ * depending on the situation e.g. --cached/--index.  If we are
+ * applying a non-git patch that incrementally updates the tree,
+ * we read from the result of a previous diff.
+ */
+static int load_preimage(struct image *image,
+			 struct patch *patch, struct stat *st, struct cache_entry *ce)
 {
 	struct strbuf buf = STRBUF_INIT;
-	struct image image;
 	size_t len;
 	char *img;
-	struct patch *tpatch;
+	struct patch *previous;
+	int status;
 
-	if (!(patch->is_copy || patch->is_rename) &&
-	    (tpatch = in_fn_table(patch->old_name)) != NULL && !to_be_deleted(tpatch)) {
-		if (was_deleted(tpatch)) {
-			return error("patch %s has been renamed/deleted",
-				patch->old_name);
-		}
-		/* We have a patched copy in memory use that */
-		strbuf_add(&buf, tpatch->result, tpatch->resultsize);
-	} else if (cached) {
-		if (read_file_or_gitlink(ce, &buf))
-			return error("read of %s failed", patch->old_name);
-	} else if (patch->old_name) {
-		if (S_ISGITLINK(patch->old_mode)) {
-			if (ce) {
-				read_file_or_gitlink(ce, &buf);
-			} else {
-				/*
-				 * There is no way to apply subproject
-				 * patch without looking at the index.
-				 */
-				patch->fragments = NULL;
-			}
-		} else {
-			if (read_old_data(st, patch->old_name, &buf))
-				return error("read of %s failed", patch->old_name);
+	previous = previous_patch(patch, &status);
+	if (status)
+		return error(_("path %s has been renamed/deleted"),
+			     patch->old_name);
+	if (previous) {
+		/* We have a patched copy in memory; use that. */
+		strbuf_add(&buf, previous->result, previous->resultsize);
+	} else {
+		status = load_patch_target(&buf, ce, st,
+					   patch->old_name, patch->old_mode);
+		if (status < 0)
+			return status;
+		else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
+			/*
+			 * There is no way to apply subproject
+			 * patch without looking at the index.
+			 * NEEDSWORK: shouldn't this be flagged
+			 * as an error???
+			 */
+			free_fragment_list(patch->fragments);
+			patch->fragments = NULL;
+		} else if (status) {
+			return error(_("read of %s failed"), patch->old_name);
 		}
 	}
 
 	img = strbuf_detach(&buf, &len);
-	prepare_image(&image, img, len, !patch->is_binary);
+	prepare_image(image, img, len, !patch->is_binary);
+	return 0;
+}
 
-	if (apply_fragments(&image, patch) < 0)
-		return -1; /* note with --reject this succeeds. */
-	patch->result = image.buf;
-	patch->resultsize = image.len;
-	add_to_fn_table(patch);
-	free(image.line_allocated);
+static int three_way_merge(struct image *image,
+			   char *path,
+			   const unsigned char *base,
+			   const unsigned char *ours,
+			   const unsigned char *theirs)
+{
+	mmfile_t base_file, our_file, their_file;
+	mmbuffer_t result = { NULL };
+	int status;
 
-	if (0 < patch->is_delete && patch->resultsize)
-		return error("removal patch leaves file contents");
+	read_mmblob(&base_file, base);
+	read_mmblob(&our_file, ours);
+	read_mmblob(&their_file, theirs);
+	status = ll_merge(&result, path,
+			  &base_file, "base",
+			  &our_file, "ours",
+			  &their_file, "theirs", NULL);
+	free(base_file.ptr);
+	free(our_file.ptr);
+	free(their_file.ptr);
+	if (status < 0 || !result.ptr) {
+		free(result.ptr);
+		return -1;
+	}
+	clear_image(image);
+	image->buf = result.ptr;
+	image->len = result.size;
+
+	return status;
+}
 
+/*
+ * When directly falling back to add/add three-way merge, we read from
+ * the current contents of the new_name.  In no cases other than that
+ * this function will be called.
+ */
+static int load_current(struct image *image, struct patch *patch)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int status, pos;
+	size_t len;
+	char *img;
+	struct stat st;
+	struct cache_entry *ce;
+	char *name = patch->new_name;
+	unsigned mode = patch->new_mode;
+
+	if (!patch->is_new)
+		die("BUG: patch to %s is not a creation", patch->old_name);
+
+	pos = cache_name_pos(name, strlen(name));
+	if (pos < 0)
+		return error(_("%s: does not exist in index"), name);
+	ce = active_cache[pos];
+	if (lstat(name, &st)) {
+		if (errno != ENOENT)
+			return error(_("%s: %s"), name, strerror(errno));
+		if (checkout_target(ce, &st))
+			return -1;
+	}
+	if (verify_index_match(ce, &st))
+		return error(_("%s: does not match index"), name);
+
+	status = load_patch_target(&buf, ce, &st, name, mode);
+	if (status < 0)
+		return status;
+	else if (status)
+		return -1;
+	img = strbuf_detach(&buf, &len);
+	prepare_image(image, img, len, !patch->is_binary);
 	return 0;
 }
 
-static int check_to_create_blob(const char *new_name, int ok_if_exists)
+static int try_threeway(struct image *image, struct patch *patch,
+			struct stat *st, struct cache_entry *ce)
 {
-	struct stat nst;
-	if (!lstat(new_name, &nst)) {
-		if (S_ISDIR(nst.st_mode) || ok_if_exists)
-			return 0;
-		/*
-		 * A leading component of new_name might be a symlink
-		 * that is going to be removed with this patch, but
-		 * still pointing at somewhere that has the path.
-		 * In such a case, path "new_name" does not exist as
-		 * far as git is concerned.
-		 */
-		if (has_symlink_leading_path(new_name, strlen(new_name)))
-			return 0;
+	unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
+	struct strbuf buf = STRBUF_INIT;
+	size_t len;
+	int status;
+	char *img;
+	struct image tmp_image;
 
-		return error("%s: already exists in working directory", new_name);
+	/* No point falling back to 3-way merge in these cases */
+	if (patch->is_delete ||
+	    S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
+		return -1;
+
+	/* Preimage the patch was prepared for */
+	if (patch->is_new)
+		write_sha1_file("", 0, blob_type, pre_sha1);
+	else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
+		 read_blob_object(&buf, pre_sha1, patch->old_mode))
+		return error("repository lacks the necessary blob to fall back on 3-way merge.");
+
+	fprintf(stderr, "Falling back to three-way merge...\n");
+
+	img = strbuf_detach(&buf, &len);
+	prepare_image(&tmp_image, img, len, 1);
+	/* Apply the patch to get the post image */
+	if (apply_fragments(&tmp_image, patch) < 0) {
+		clear_image(&tmp_image);
+		return -1;
+	}
+	/* post_sha1[] is theirs */
+	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
+	clear_image(&tmp_image);
+
+	/* our_sha1[] is ours */
+	if (patch->is_new) {
+		if (load_current(&tmp_image, patch))
+			return error("cannot read the current contents of '%s'",
+				     patch->new_name);
+	} else {
+		if (load_preimage(&tmp_image, patch, st, ce))
+			return error("cannot read the current contents of '%s'",
+				     patch->old_name);
+	}
+	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
+	clear_image(&tmp_image);
+
+	/* in-core three-way merge between post and our using pre as base */
+	status = three_way_merge(image, patch->new_name,
+				 pre_sha1, our_sha1, post_sha1);
+	if (status < 0) {
+		fprintf(stderr, "Failed to fall back on three-way merge...\n");
+		return status;
+	}
+
+	if (status) {
+		patch->conflicted_threeway = 1;
+		if (patch->is_new)
+			hashclr(patch->threeway_stage[0]);
+		else
+			hashcpy(patch->threeway_stage[0], pre_sha1);
+		hashcpy(patch->threeway_stage[1], our_sha1);
+		hashcpy(patch->threeway_stage[2], post_sha1);
+		fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name);
+	} else {
+		fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name);
 	}
-	else if ((errno != ENOENT) && (errno != ENOTDIR))
-		return error("%s: %s", new_name, strerror(errno));
 	return 0;
 }
 
-static int verify_index_match(struct cache_entry *ce, struct stat *st)
+static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce)
 {
-	if (S_ISGITLINK(ce->ce_mode)) {
-		if (!S_ISDIR(st->st_mode))
+	struct image image;
+
+	if (load_preimage(&image, patch, st, ce) < 0)
+		return -1;
+
+	if (patch->direct_to_threeway ||
+	    apply_fragments(&image, patch) < 0) {
+		/* Note: with --reject, apply_fragments() returns 0 */
+		if (!threeway || try_threeway(&image, patch, st, ce) < 0)
 			return -1;
-		return 0;
 	}
-	return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
+	patch->result = image.buf;
+	patch->resultsize = image.len;
+	add_to_fn_table(patch);
+	free(image.line_allocated);
+
+	if (0 < patch->is_delete && patch->resultsize)
+		return error(_("removal patch leaves file contents"));
+
+	return 0;
 }
 
+/*
+ * If "patch" that we are looking at modifies or deletes what we have,
+ * we would want it not to lose any local modification we have, either
+ * in the working tree or in the index.
+ *
+ * This also decides if a non-git patch is a creation patch or a
+ * modification to an existing empty file.  We do not check the state
+ * of the current tree for a creation patch in this function; the caller
+ * check_patch() separately makes sure (and errors out otherwise) that
+ * the path the patch creates does not exist in the current tree.
+ */
 static int check_preimage(struct patch *patch, struct cache_entry **ce, struct stat *st)
 {
 	const char *old_name = patch->old_name;
-	struct patch *tpatch = NULL;
-	int stat_ret = 0;
+	struct patch *previous = NULL;
+	int stat_ret = 0, status;
 	unsigned st_mode = 0;
 
-	/*
-	 * Make sure that we do not have local modifications from the
-	 * index when we are looking at the index.  Also make sure
-	 * we have the preimage file to be patched in the work tree,
-	 * unless --cached, which tells git to apply only in the index.
-	 */
 	if (!old_name)
 		return 0;
 
 	assert(patch->is_new <= 0);
+	previous = previous_patch(patch, &status);
 
-	if (!(patch->is_copy || patch->is_rename) &&
-	    (tpatch = in_fn_table(old_name)) != NULL && !to_be_deleted(tpatch)) {
-		if (was_deleted(tpatch))
-			return error("%s: has been deleted/renamed", old_name);
-		st_mode = tpatch->new_mode;
+	if (status)
+		return error(_("path %s has been renamed/deleted"), old_name);
+	if (previous) {
+		st_mode = previous->new_mode;
 	} else if (!cached) {
 		stat_ret = lstat(old_name, st);
 		if (stat_ret && errno != ENOENT)
-			return error("%s: %s", old_name, strerror(errno));
+			return error(_("%s: %s"), old_name, strerror(errno));
 	}
 
-	if (to_be_deleted(tpatch))
-		tpatch = NULL;
-
-	if (check_index && !tpatch) {
+	if (check_index && !previous) {
 		int pos = cache_name_pos(old_name, strlen(old_name));
 		if (pos < 0) {
 			if (patch->is_new < 0)
 				goto is_new;
-			return error("%s: does not exist in index", old_name);
+			return error(_("%s: does not exist in index"), old_name);
 		}
 		*ce = active_cache[pos];
 		if (stat_ret < 0) {
-			struct checkout costate;
-			/* checkout */
-			memset(&costate, 0, sizeof(costate));
-			costate.base_dir = "";
-			costate.refresh_cache = 1;
-			if (checkout_entry(*ce, &costate, NULL) ||
-			    lstat(old_name, st))
+			if (checkout_target(*ce, st))
 				return -1;
 		}
 		if (!cached && verify_index_match(*ce, st))
-			return error("%s: does not match index", old_name);
+			return error(_("%s: does not match index"), old_name);
 		if (cached)
 			st_mode = (*ce)->ce_mode;
 	} else if (stat_ret < 0) {
 		if (patch->is_new < 0)
 			goto is_new;
-		return error("%s: %s", old_name, strerror(errno));
+		return error(_("%s: %s"), old_name, strerror(errno));
 	}
 
-	if (!cached && !tpatch)
+	if (!cached && !previous)
 		st_mode = ce_mode_from_stat(*ce, st->st_mode);
 
 	if (patch->is_new < 0)
@@ -3074,9 +3414,9 @@ static int check_preimage(struct patch *patch, struct cache_entry **ce, struct s
 	if (!patch->old_mode)
 		patch->old_mode = st_mode;
 	if ((st_mode ^ patch->old_mode) & S_IFMT)
-		return error("%s: wrong type", old_name);
+		return error(_("%s: wrong type"), old_name);
 	if (st_mode != patch->old_mode)
-		warning("%s has type %o, expected %o",
+		warning(_("%s has type %o, expected %o"),
 			old_name, st_mode, patch->old_mode);
 	if (!patch->new_mode && !patch->is_delete)
 		patch->new_mode = st_mode;
@@ -3085,10 +3425,50 @@ static int check_preimage(struct patch *patch, struct cache_entry **ce, struct s
  is_new:
 	patch->is_new = 1;
 	patch->is_delete = 0;
+	free(patch->old_name);
 	patch->old_name = NULL;
 	return 0;
 }
 
+
+#define EXISTS_IN_INDEX 1
+#define EXISTS_IN_WORKTREE 2
+
+static int check_to_create(const char *new_name, int ok_if_exists)
+{
+	struct stat nst;
+
+	if (check_index &&
+	    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
+	    !ok_if_exists)
+		return EXISTS_IN_INDEX;
+	if (cached)
+		return 0;
+
+	if (!lstat(new_name, &nst)) {
+		if (S_ISDIR(nst.st_mode) || ok_if_exists)
+			return 0;
+		/*
+		 * A leading component of new_name might be a symlink
+		 * that is going to be removed with this patch, but
+		 * still pointing at somewhere that has the path.
+		 * In such a case, path "new_name" does not exist as
+		 * far as git is concerned.
+		 */
+		if (has_symlink_leading_path(new_name, strlen(new_name)))
+			return 0;
+
+		return EXISTS_IN_WORKTREE;
+	} else if ((errno != ENOENT) && (errno != ENOTDIR)) {
+		return error("%s: %s", new_name, strerror(errno));
+	}
+	return 0;
+}
+
+/*
+ * Check and apply the patch in-core; leave the result in patch->result
+ * for the caller to write it out to the final destination.
+ */
 static int check_patch(struct patch *patch)
 {
 	struct stat st;
@@ -3107,31 +3487,45 @@ static int check_patch(struct patch *patch)
 		return status;
 	old_name = patch->old_name;
 
+	/*
+	 * A type-change diff is always split into a patch to delete
+	 * old, immediately followed by a patch to create new (see
+	 * diff.c::run_diff()); in such a case it is Ok that the entry
+	 * to be deleted by the previous patch is still in the working
+	 * tree and in the index.
+	 *
+	 * A patch to swap-rename between A and B would first rename A
+	 * to B and then rename B to A.  While applying the first one,
+	 * the presense of B should not stop A from getting renamed to
+	 * B; ask to_be_deleted() about the later rename.  Removal of
+	 * B and rename from A to B is handled the same way by asking
+	 * was_deleted().
+	 */
 	if ((tpatch = in_fn_table(new_name)) &&
-			(was_deleted(tpatch) || to_be_deleted(tpatch)))
-		/*
-		 * A type-change diff is always split into a patch to
-		 * delete old, immediately followed by a patch to
-		 * create new (see diff.c::run_diff()); in such a case
-		 * it is Ok that the entry to be deleted by the
-		 * previous patch is still in the working tree and in
-		 * the index.
-		 */
+	    (was_deleted(tpatch) || to_be_deleted(tpatch)))
 		ok_if_exists = 1;
 	else
 		ok_if_exists = 0;
 
 	if (new_name &&
 	    ((0 < patch->is_new) | (0 < patch->is_rename) | patch->is_copy)) {
-		if (check_index &&
-		    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
-		    !ok_if_exists)
-			return error("%s: already exists in index", new_name);
-		if (!cached) {
-			int err = check_to_create_blob(new_name, ok_if_exists);
-			if (err)
-				return err;
+		int err = check_to_create(new_name, ok_if_exists);
+
+		if (err && threeway) {
+			patch->direct_to_threeway = 1;
+		} else switch (err) {
+		case 0:
+			break; /* happy */
+		case EXISTS_IN_INDEX:
+			return error(_("%s: already exists in index"), new_name);
+			break;
+		case EXISTS_IN_WORKTREE:
+			return error(_("%s: already exists in working directory"),
+				     new_name);
+		default:
+			return err;
 		}
+
 		if (!patch->new_mode) {
 			if (0 < patch->is_new)
 				patch->new_mode = S_IFREG | 0644;
@@ -3144,14 +3538,22 @@ static int check_patch(struct patch *patch)
 		int same = !strcmp(old_name, new_name);
 		if (!patch->new_mode)
 			patch->new_mode = patch->old_mode;
-		if ((patch->old_mode ^ patch->new_mode) & S_IFMT)
-			return error("new mode (%o) of %s does not match old mode (%o)%s%s",
-				patch->new_mode, new_name, patch->old_mode,
-				same ? "" : " of ", same ? "" : old_name);
+		if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
+			if (same)
+				return error(_("new mode (%o) of %s does not "
+					       "match old mode (%o)"),
+					patch->new_mode, new_name,
+					patch->old_mode);
+			else
+				return error(_("new mode (%o) of %s does not "
+					       "match old mode (%o) of %s"),
+					patch->new_mode, new_name,
+					patch->old_mode, old_name);
+		}
 	}
 
 	if (apply_data(patch, &st, ce) < 0)
-		return error("%s: patch does not apply", name);
+		return error(_("%s: patch does not apply"), name);
 	patch->rejected = 0;
 	return 0;
 }
@@ -3164,7 +3566,7 @@ static int check_patch_list(struct patch *patch)
 	while (patch) {
 		if (apply_verbosely)
 			say_patch_name(stderr,
-				       "Checking patch ", patch, "...\n");
+				       _("Checking patch %s..."), patch);
 		err |= check_patch(patch);
 		patch = patch->next;
 	}
@@ -3204,7 +3606,7 @@ static void build_fake_ancestor(struct patch *list, const char *filename)
 		name = patch->old_name ? patch->old_name : patch->new_name;
 		if (0 < patch->is_new)
 			continue;
-		else if (get_sha1(patch->old_sha1_prefix, sha1))
+		else if (get_sha1_blob(patch->old_sha1_prefix, sha1))
 			/* git diff has no index line for mode/type changes */
 			if (!patch->lines_added && !patch->lines_deleted) {
 				if (get_current_sha1(patch->old_name, sha1))
@@ -3219,7 +3621,7 @@ static void build_fake_ancestor(struct patch *list, const char *filename)
 
 		ce = make_cache_entry(patch->old_mode, sha1_ptr, name, 0, 0);
 		if (!ce)
-			die("make_cache_entry failed for path '%s'", name);
+			die(_("make_cache_entry failed for path '%s'"), name);
 		if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
 			die ("Could not add %s to temporary index", name);
 	}
@@ -3362,7 +3764,7 @@ static void remove_file(struct patch *patch, int rmdir_empty)
 {
 	if (update_index) {
 		if (remove_file_from_cache(patch->old_name) < 0)
-			die("unable to remove %s from index", patch->old_name);
+			die(_("unable to remove %s from index"), patch->old_name);
 	}
 	if (!cached) {
 		if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
@@ -3384,24 +3786,25 @@ static void add_index_file(const char *path, unsigned mode, void *buf, unsigned
 	ce = xcalloc(1, ce_size);
 	memcpy(ce->name, path, namelen);
 	ce->ce_mode = create_ce_mode(mode);
-	ce->ce_flags = namelen;
+	ce->ce_flags = create_ce_flags(0);
+	ce->ce_namelen = namelen;
 	if (S_ISGITLINK(mode)) {
 		const char *s = buf;
 
 		if (get_sha1_hex(s + strlen("Subproject commit "), ce->sha1))
-			die("corrupt patch for subproject %s", path);
+			die(_("corrupt patch for subproject %s"), path);
 	} else {
 		if (!cached) {
 			if (lstat(path, &st) < 0)
-				die_errno("unable to stat newly created file '%s'",
+				die_errno(_("unable to stat newly created file '%s'"),
 					  path);
 			fill_stat_cache_info(ce, &st);
 		}
 		if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
-			die("unable to create backing store for newly created file %s", path);
+			die(_("unable to create backing store for newly created file %s"), path);
 	}
 	if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
-		die("unable to add cache entry for %s", path);
+		die(_("unable to add cache entry for %s"), path);
 }
 
 static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
@@ -3434,7 +3837,7 @@ static int try_create_file(const char *path, unsigned int mode, const char *buf,
 	strbuf_release(&nbuf);
 
 	if (close(fd) < 0)
-		die_errno("closing file '%s'", path);
+		die_errno(_("closing file '%s'"), path);
 	return 0;
 }
 
@@ -3483,7 +3886,34 @@ static void create_one_file(char *path, unsigned mode, const char *buf, unsigned
 			++nr;
 		}
 	}
-	die_errno("unable to write file '%s' mode %o", path, mode);
+	die_errno(_("unable to write file '%s' mode %o"), path, mode);
+}
+
+static void add_conflicted_stages_file(struct patch *patch)
+{
+	int stage, namelen;
+	unsigned ce_size, mode;
+	struct cache_entry *ce;
+
+	if (!update_index)
+		return;
+	namelen = strlen(patch->new_name);
+	ce_size = cache_entry_size(namelen);
+	mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
+
+	remove_file_from_cache(patch->new_name);
+	for (stage = 1; stage < 4; stage++) {
+		if (is_null_sha1(patch->threeway_stage[stage - 1]))
+			continue;
+		ce = xcalloc(1, ce_size);
+		memcpy(ce->name, patch->new_name, namelen);
+		ce->ce_mode = create_ce_mode(mode);
+		ce->ce_flags = create_ce_flags(stage);
+		ce->ce_namelen = namelen;
+		hashcpy(ce->sha1, patch->threeway_stage[stage - 1]);
+		if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
+			die(_("unable to add cache entry for %s"), patch->new_name);
+	}
 }
 
 static void create_file(struct patch *patch)
@@ -3496,7 +3926,11 @@ static void create_file(struct patch *patch)
 	if (!mode)
 		mode = S_IFREG | 0644;
 	create_one_file(path, mode, buf, size);
-	add_index_file(path, mode, buf, size);
+
+	if (patch->conflicted_threeway)
+		add_conflicted_stages_file(patch);
+	else
+		add_index_file(path, mode, buf, size);
 }
 
 /* phase zero is to remove, phase one is to create */
@@ -3528,6 +3962,7 @@ static int write_out_one_reject(struct patch *patch)
 	char namebuf[PATH_MAX];
 	struct fragment *frag;
 	int cnt = 0;
+	struct strbuf sb = STRBUF_INIT;
 
 	for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
 		if (!frag->rejected)
@@ -3538,7 +3973,7 @@ static int write_out_one_reject(struct patch *patch)
 	if (!cnt) {
 		if (apply_verbosely)
 			say_patch_name(stderr,
-				       "Applied patch ", patch, " cleanly.\n");
+				       _("Applied patch %s cleanly."), patch);
 		return 0;
 	}
 
@@ -3546,16 +3981,20 @@ static int write_out_one_reject(struct patch *patch)
 	 * contents are marked "rejected" at the patch level.
 	 */
 	if (!patch->new_name)
-		die("internal error");
+		die(_("internal error"));
 
 	/* Say this even without --verbose */
-	say_patch_name(stderr, "Applying patch ", patch, " with");
-	fprintf(stderr, " %d rejects...\n", cnt);
+	strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
+			    "Applying patch %%s with %d rejects...",
+			    cnt),
+		    cnt);
+	say_patch_name(stderr, sb.buf, patch);
+	strbuf_release(&sb);
 
 	cnt = strlen(patch->new_name);
 	if (ARRAY_SIZE(namebuf) <= cnt + 5) {
 		cnt = ARRAY_SIZE(namebuf) - 5;
-		warning("truncating .rej filename to %.*s.rej",
+		warning(_("truncating .rej filename to %.*s.rej"),
 			cnt - 1, patch->new_name);
 	}
 	memcpy(namebuf, patch->new_name, cnt);
@@ -3563,7 +4002,7 @@ static int write_out_one_reject(struct patch *patch)
 
 	rej = fopen(namebuf, "w");
 	if (!rej)
-		return error("cannot open %s: %s", namebuf, strerror(errno));
+		return error(_("cannot open %s: %s"), namebuf, strerror(errno));
 
 	/* Normal git tools never deal with .rej, so do not pretend
 	 * this is a git patch by saying --git nor give extended
@@ -3576,10 +4015,10 @@ static int write_out_one_reject(struct patch *patch)
 	     frag;
 	     cnt++, frag = frag->next) {
 		if (!frag->rejected) {
-			fprintf(stderr, "Hunk #%d applied cleanly.\n", cnt);
+			fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
 			continue;
 		}
-		fprintf(stderr, "Rejected hunk #%d.\n", cnt);
+		fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
 		fprintf(rej, "%.*s", frag->size, frag->patch);
 		if (frag->patch[frag->size-1] != '\n')
 			fputc('\n', rej);
@@ -3593,6 +4032,7 @@ static int write_out_results(struct patch *list)
 	int phase;
 	int errs = 0;
 	struct patch *l;
+	struct string_list cpath = STRING_LIST_INIT_DUP;
 
 	for (phase = 0; phase < 2; phase++) {
 		l = list;
@@ -3601,12 +4041,30 @@ static int write_out_results(struct patch *list)
 				errs = 1;
 			else {
 				write_out_one_result(l, phase);
-				if (phase == 1 && write_out_one_reject(l))
-					errs = 1;
+				if (phase == 1) {
+					if (write_out_one_reject(l))
+						errs = 1;
+					if (l->conflicted_threeway) {
+						string_list_append(&cpath, l->new_name);
+						errs = 1;
+					}
+				}
 			}
 			l = l->next;
 		}
 	}
+
+	if (cpath.nr) {
+		struct string_list_item *item;
+
+		sort_string_list(&cpath);
+		for_each_string_list_item(item, &cpath)
+			fprintf(stderr, "U %s\n", item->string);
+		string_list_clear(&cpath, 0);
+
+		rerere(0);
+	}
+
 	return errs;
 }
 
@@ -3665,15 +4123,8 @@ static void prefix_patches(struct patch *p)
 	if (!prefix || p->is_toplevel_relative)
 		return;
 	for ( ; p; p = p->next) {
-		if (p->new_name == p->old_name) {
-			char *prefixed = p->new_name;
-			prefix_one(&prefixed);
-			p->new_name = p->old_name = prefixed;
-		}
-		else {
-			prefix_one(&p->new_name);
-			prefix_one(&p->old_name);
-		}
+		prefix_one(&p->new_name);
+		prefix_one(&p->old_name);
 	}
 }
 
@@ -3683,12 +4134,10 @@ static void prefix_patches(struct patch *p)
 static int apply_patch(int fd, const char *filename, int options)
 {
 	size_t offset;
-	struct strbuf buf = STRBUF_INIT;
+	struct strbuf buf = STRBUF_INIT; /* owns the patch text */
 	struct patch *list = NULL, **listp = &list;
 	int skipped_patch = 0;
 
-	/* FIXME - memory leak when using multiple patch files as inputs */
-	memset(&fn_table, 0, sizeof(struct string_list));
 	patch_input_file = filename;
 	read_patch_file(&buf, fd);
 	offset = 0;
@@ -3712,15 +4161,14 @@ static int apply_patch(int fd, const char *filename, int options)
 			listp = &patch->next;
 		}
 		else {
-			/* perhaps free it a bit better? */
-			free(patch);
+			free_patch(patch);
 			skipped_patch++;
 		}
 		offset += nr;
 	}
 
 	if (!list && !skipped_patch)
-		die("unrecognized input");
+		die(_("unrecognized input"));
 
 	if (whitespace_error && (ws_error_action == die_on_ws_error))
 		apply = 0;
@@ -3731,7 +4179,7 @@ static int apply_patch(int fd, const char *filename, int options)
 
 	if (check_index) {
 		if (read_cache() < 0)
-			die("unable to read index file");
+			die(_("unable to read index file"));
 	}
 
 	if ((check || apply) &&
@@ -3739,8 +4187,12 @@ static int apply_patch(int fd, const char *filename, int options)
 	    !apply_with_reject)
 		exit(1);
 
-	if (apply && write_out_results(list))
-		exit(1);
+	if (apply && write_out_results(list)) {
+		if (apply_with_reject)
+			exit(1);
+		/* with --3way, we still need to write the index out */
+		return 1;
+	}
 
 	if (fake_ancestor)
 		build_fake_ancestor(list, fake_ancestor);
@@ -3754,7 +4206,9 @@ static int apply_patch(int fd, const char *filename, int options)
 	if (summary)
 		summary_patch_list(list);
 
+	free_patch_list(list);
 	strbuf_release(&buf);
+	string_list_clear(&fn_table, 0);
 	return 0;
 }
 
@@ -3844,66 +4298,68 @@ int cmd_apply(int argc, const char **argv, const char *prefix_)
 	const char *whitespace_option = NULL;
 
 	struct option builtin_apply_options[] = {
-		{ OPTION_CALLBACK, 0, "exclude", NULL, "path",
-			"don't apply changes matching the given path",
+		{ OPTION_CALLBACK, 0, "exclude", NULL, N_("path"),
+			N_("don't apply changes matching the given path"),
 			0, option_parse_exclude },
-		{ OPTION_CALLBACK, 0, "include", NULL, "path",
-			"apply changes matching the given path",
+		{ OPTION_CALLBACK, 0, "include", NULL, N_("path"),
+			N_("apply changes matching the given path"),
 			0, option_parse_include },
-		{ OPTION_CALLBACK, 'p', NULL, NULL, "num",
-			"remove <num> leading slashes from traditional diff paths",
+		{ OPTION_CALLBACK, 'p', NULL, NULL, N_("num"),
+			N_("remove <num> leading slashes from traditional diff paths"),
 			0, option_parse_p },
 		OPT_BOOLEAN(0, "no-add", &no_add,
-			"ignore additions made by the patch"),
+			N_("ignore additions made by the patch")),
 		OPT_BOOLEAN(0, "stat", &diffstat,
-			"instead of applying the patch, output diffstat for the input"),
+			N_("instead of applying the patch, output diffstat for the input")),
 		OPT_NOOP_NOARG(0, "allow-binary-replacement"),
 		OPT_NOOP_NOARG(0, "binary"),
 		OPT_BOOLEAN(0, "numstat", &numstat,
-			"shows number of added and deleted lines in decimal notation"),
+			N_("show number of added and deleted lines in decimal notation")),
 		OPT_BOOLEAN(0, "summary", &summary,
-			"instead of applying the patch, output a summary for the input"),
+			N_("instead of applying the patch, output a summary for the input")),
 		OPT_BOOLEAN(0, "check", &check,
-			"instead of applying the patch, see if the patch is applicable"),
+			N_("instead of applying the patch, see if the patch is applicable")),
 		OPT_BOOLEAN(0, "index", &check_index,
-			"make sure the patch is applicable to the current index"),
+			N_("make sure the patch is applicable to the current index")),
 		OPT_BOOLEAN(0, "cached", &cached,
-			"apply a patch without touching the working tree"),
+			N_("apply a patch without touching the working tree")),
 		OPT_BOOLEAN(0, "apply", &force_apply,
-			"also apply the patch (use with --stat/--summary/--check)"),
+			N_("also apply the patch (use with --stat/--summary/--check)")),
+		OPT_BOOL('3', "3way", &threeway,
+			 N_( "attempt three-way merge if a patch does not apply")),
 		OPT_FILENAME(0, "build-fake-ancestor", &fake_ancestor,
-			"build a temporary index based on embedded index information"),
+			N_("build a temporary index based on embedded index information")),
 		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
-			"paths are separated with NUL character",
+			N_("paths are separated with NUL character"),
 			PARSE_OPT_NOARG, option_parse_z },
 		OPT_INTEGER('C', NULL, &p_context,
-				"ensure at least <n> lines of context match"),
-		{ OPTION_CALLBACK, 0, "whitespace", &whitespace_option, "action",
-			"detect new or modified lines that have whitespace errors",
+				N_("ensure at least <n> lines of context match")),
+		{ OPTION_CALLBACK, 0, "whitespace", &whitespace_option, N_("action"),
+			N_("detect new or modified lines that have whitespace errors"),
 			0, option_parse_whitespace },
 		{ OPTION_CALLBACK, 0, "ignore-space-change", NULL, NULL,
-			"ignore changes in whitespace when finding context",
+			N_("ignore changes in whitespace when finding context"),
 			PARSE_OPT_NOARG, option_parse_space_change },
 		{ OPTION_CALLBACK, 0, "ignore-whitespace", NULL, NULL,
-			"ignore changes in whitespace when finding context",
+			N_("ignore changes in whitespace when finding context"),
 			PARSE_OPT_NOARG, option_parse_space_change },
 		OPT_BOOLEAN('R', "reverse", &apply_in_reverse,
-			"apply the patch in reverse"),
+			N_("apply the patch in reverse")),
 		OPT_BOOLEAN(0, "unidiff-zero", &unidiff_zero,
-			"don't expect at least one line of context"),
+			N_("don't expect at least one line of context")),
 		OPT_BOOLEAN(0, "reject", &apply_with_reject,
-			"leave the rejected hunks in corresponding *.rej files"),
+			N_("leave the rejected hunks in corresponding *.rej files")),
 		OPT_BOOLEAN(0, "allow-overlap", &allow_overlap,
-			"allow overlapping hunks"),
-		OPT__VERBOSE(&apply_verbosely, "be verbose"),
+			N_("allow overlapping hunks")),
+		OPT__VERBOSE(&apply_verbosely, N_("be verbose")),
 		OPT_BIT(0, "inaccurate-eof", &options,
-			"tolerate incorrectly detected missing new-line at the end of file",
+			N_("tolerate incorrectly detected missing new-line at the end of file"),
 			INACCURATE_EOF),
 		OPT_BIT(0, "recount", &options,
-			"do not trust the line counts in the hunk headers",
+			N_("do not trust the line counts in the hunk headers"),
 			RECOUNT),
-		{ OPTION_CALLBACK, 0, "directory", NULL, "root",
-			"prepend <root> to all filenames",
+		{ OPTION_CALLBACK, 0, "directory", NULL, N_("root"),
+			N_("prepend <root> to all filenames"),
 			0, option_parse_directory },
 		OPT_END()
 	};
@@ -3919,15 +4375,24 @@ int cmd_apply(int argc, const char **argv, const char *prefix_)
 	argc = parse_options(argc, argv, prefix, builtin_apply_options,
 			apply_usage, 0);
 
+	if (apply_with_reject && threeway)
+		die("--reject and --3way cannot be used together.");
+	if (cached && threeway)
+		die("--cached and --3way cannot be used together.");
+	if (threeway) {
+		if (is_not_gitdir)
+			die(_("--3way outside a repository"));
+		check_index = 1;
+	}
 	if (apply_with_reject)
 		apply = apply_verbosely = 1;
 	if (!force_apply && (diffstat || numstat || summary || check || fake_ancestor))
 		apply = 0;
 	if (check_index && is_not_gitdir)
-		die("--index outside a repository");
+		die(_("--index outside a repository"));
 	if (cached) {
 		if (is_not_gitdir)
-			die("--cached outside a repository");
+			die(_("--cached outside a repository"));
 		check_index = 1;
 	}
 	for (i = 0; i < argc; i++) {
@@ -3943,7 +4408,7 @@ int cmd_apply(int argc, const char **argv, const char *prefix_)
 
 		fd = open(arg, O_RDONLY);
 		if (fd < 0)
-			die_errno("can't open patch '%s'", arg);
+			die_errno(_("can't open patch '%s'"), arg);
 		read_stdin = 0;
 		set_default_whitespace_mode(whitespace_option);
 		errs |= apply_patch(fd, arg, options);
@@ -3957,32 +4422,32 @@ int cmd_apply(int argc, const char **argv, const char *prefix_)
 		    squelch_whitespace_errors < whitespace_error) {
 			int squelched =
 				whitespace_error - squelch_whitespace_errors;
-			warning("squelched %d "
-				"whitespace error%s",
-				squelched,
-				squelched == 1 ? "" : "s");
+			warning(Q_("squelched %d whitespace error",
+				   "squelched %d whitespace errors",
+				   squelched),
+				squelched);
 		}
 		if (ws_error_action == die_on_ws_error)
-			die("%d line%s add%s whitespace errors.",
-			    whitespace_error,
-			    whitespace_error == 1 ? "" : "s",
-			    whitespace_error == 1 ? "s" : "");
+			die(Q_("%d line adds whitespace errors.",
+			       "%d lines add whitespace errors.",
+			       whitespace_error),
+			    whitespace_error);
 		if (applied_after_fixing_ws && apply)
 			warning("%d line%s applied after"
 				" fixing whitespace errors.",
 				applied_after_fixing_ws,
 				applied_after_fixing_ws == 1 ? "" : "s");
 		else if (whitespace_error)
-			warning("%d line%s add%s whitespace errors.",
-				whitespace_error,
-				whitespace_error == 1 ? "" : "s",
-				whitespace_error == 1 ? "s" : "");
+			warning(Q_("%d line adds whitespace errors.",
+				   "%d lines add whitespace errors.",
+				   whitespace_error),
+				whitespace_error);
 	}
 
 	if (update_index) {
 		if (write_cache(newfd, active_cache, active_nr) ||
 		    commit_locked_index(&lock_file))
-			die("Unable to write new index file");
+			die(_("Unable to write new index file"));
 	}
 
 	return !!errs;
diff --git a/builtin/archive.c b/builtin/archive.c
index 931956de..9a1cfd3d 100644
--- a/builtin/archive.c
+++ b/builtin/archive.c
@@ -88,12 +88,12 @@ int cmd_archive(int argc, const char **argv, const char *prefix)
 	const char *output = NULL;
 	const char *remote = NULL;
 	struct option local_opts[] = {
-		OPT_STRING('o', "output", &output, "file",
-			"write the archive to this file"),
-		OPT_STRING(0, "remote", &remote, "repo",
-			"retrieve the archive from remote repository <repo>"),
-		OPT_STRING(0, "exec", &exec, "cmd",
-			"path to the remote git-upload-archive command"),
+		OPT_STRING('o', "output", &output, N_("file"),
+			N_("write the archive to this file")),
+		OPT_STRING(0, "remote", &remote, N_("repo"),
+			N_("retrieve the archive from remote repository <repo>")),
+		OPT_STRING(0, "exec", &exec, N_("command"),
+			N_("path to the remote git-upload-archive command")),
 		OPT_END()
 	};
 
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 8d325a51..e3884e3b 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -4,7 +4,7 @@
 #include "bisect.h"
 
 static const char * const git_bisect_helper_usage[] = {
-	"git bisect--helper --next-all [--no-checkout]",
+	N_("git bisect--helper --next-all [--no-checkout]"),
 	NULL
 };
 
@@ -14,9 +14,9 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 	int no_checkout = 0;
 	struct option options[] = {
 		OPT_BOOLEAN(0, "next-all", &next_all,
-			    "perform 'git bisect next'"),
+			    N_("perform 'git bisect next'")),
 		OPT_BOOLEAN(0, "no-checkout", &no_checkout,
-			    "update BISECT_HEAD instead of checking out the current commit"),
+			    N_("update BISECT_HEAD instead of checking out the current commit")),
 		OPT_END()
 	};
 
diff --git a/builtin/blame.c b/builtin/blame.c
index 324d476a..c27ef21c 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -22,12 +22,12 @@
 #include "utf8.h"
 #include "userdiff.h"
 
-static char blame_usage[] = "git blame [options] [rev-opts] [rev] [--] file";
+static char blame_usage[] = N_("git blame [options] [rev-opts] [rev] [--] file");
 
 static const char *blame_opt_usage[] = {
 	blame_usage,
 	"",
-	"[rev-opts] are documented in git-rev-list(1)",
+	N_("[rev-opts] are documented in git-rev-list(1)"),
 	NULL
 };
 
@@ -88,6 +88,20 @@ struct origin {
 	char path[FLEX_ARRAY];
 };
 
+static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b, long ctxlen,
+		      xdl_emit_hunk_consume_func_t hunk_func, void *cb_data)
+{
+	xpparam_t xpp = {0};
+	xdemitconf_t xecfg = {0};
+	xdemitcb_t ecb = {NULL};
+
+	xpp.flags = xdl_opts;
+	xecfg.ctxlen = ctxlen;
+	xecfg.hunk_func = hunk_func;
+	ecb.priv = cb_data;
+	return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
+}
+
 /*
  * Prepare diff_filespec and convert it using diff textconv API
  * if the textconv driver exists.
@@ -96,6 +110,7 @@ struct origin {
 int textconv_object(const char *path,
 		    unsigned mode,
 		    const unsigned char *sha1,
+		    int sha1_valid,
 		    char **buf,
 		    unsigned long *buf_size)
 {
@@ -103,7 +118,7 @@ int textconv_object(const char *path,
 	struct userdiff_driver *textconv;
 
 	df = alloc_filespec(path);
-	fill_filespec(df, sha1, mode);
+	fill_filespec(df, sha1, sha1_valid, mode);
 	textconv = get_textconv(df);
 	if (!textconv) {
 		free_filespec(df);
@@ -128,7 +143,7 @@ static void fill_origin_blob(struct diff_options *opt,
 
 		num_read_blob++;
 		if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
-		    textconv_object(o->path, o->mode, o->blob_sha1, &file->ptr, &file_size))
+		    textconv_object(o->path, o->mode, o->blob_sha1, 1, &file->ptr, &file_size))
 			;
 		else
 			file->ptr = read_sha1_file(o->blob_sha1, &type, &file_size);
@@ -392,8 +407,7 @@ static struct origin *find_origin(struct scoreboard *sb,
 	paths[1] = NULL;
 
 	diff_tree_setup_paths(paths, &diff_opts);
-	if (diff_setup_done(&diff_opts) < 0)
-		die("diff-setup");
+	diff_setup_done(&diff_opts);
 
 	if (is_null_sha1(origin->commit->object.sha1))
 		do_diff_cache(parent->tree->object.sha1, &diff_opts);
@@ -479,8 +493,7 @@ static struct origin *find_rename(struct scoreboard *sb,
 	diff_opts.single_follow = origin->path;
 	paths[0] = NULL;
 	diff_tree_setup_paths(paths, &diff_opts);
-	if (diff_setup_done(&diff_opts) < 0)
-		die("diff-setup");
+	diff_setup_done(&diff_opts);
 
 	if (is_null_sha1(origin->commit->object.sha1))
 		do_diff_cache(parent->tree->object.sha1, &diff_opts);
@@ -759,12 +772,14 @@ struct blame_chunk_cb_data {
 	long tlno;
 };
 
-static void blame_chunk_cb(void *data, long same, long p_next, long t_next)
+static int blame_chunk_cb(long start_a, long count_a,
+			  long start_b, long count_b, void *data)
 {
 	struct blame_chunk_cb_data *d = data;
-	blame_chunk(d->sb, d->tlno, d->plno, same, d->target, d->parent);
-	d->plno = p_next;
-	d->tlno = t_next;
+	blame_chunk(d->sb, d->tlno, d->plno, start_b, d->target, d->parent);
+	d->plno = start_a + count_a;
+	d->tlno = start_b + count_b;
+	return 0;
 }
 
 /*
@@ -779,8 +794,7 @@ static int pass_blame_to_parent(struct scoreboard *sb,
 	int last_in_target;
 	mmfile_t file_p, file_o;
 	struct blame_chunk_cb_data d;
-	xpparam_t xpp;
-	xdemitconf_t xecfg;
+
 	memset(&d, 0, sizeof(d));
 	d.sb = sb; d.target = target; d.parent = parent;
 	last_in_target = find_last_in_target(sb, target);
@@ -791,11 +805,7 @@ static int pass_blame_to_parent(struct scoreboard *sb,
 	fill_origin_blob(&sb->revs->diffopt, target, &file_o);
 	num_get_patch++;
 
-	memset(&xpp, 0, sizeof(xpp));
-	xpp.flags = xdl_opts;
-	memset(&xecfg, 0, sizeof(xecfg));
-	xecfg.ctxlen = 0;
-	xdi_diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, &xpp, &xecfg);
+	diff_hunks(&file_p, &file_o, 0, blame_chunk_cb, &d);
 	/* The rest (i.e. anything after tlno) are the same as the parent */
 	blame_chunk(sb, d.tlno, d.plno, last_in_target, target, parent);
 
@@ -899,12 +909,15 @@ struct handle_split_cb_data {
 	long tlno;
 };
 
-static void handle_split_cb(void *data, long same, long p_next, long t_next)
+static int handle_split_cb(long start_a, long count_a,
+			   long start_b, long count_b, void *data)
 {
 	struct handle_split_cb_data *d = data;
-	handle_split(d->sb, d->ent, d->tlno, d->plno, same, d->parent, d->split);
-	d->plno = p_next;
-	d->tlno = t_next;
+	handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
+		     d->split);
+	d->plno = start_a + count_a;
+	d->tlno = start_b + count_b;
+	return 0;
 }
 
 /*
@@ -922,8 +935,7 @@ static void find_copy_in_blob(struct scoreboard *sb,
 	int cnt;
 	mmfile_t file_o;
 	struct handle_split_cb_data d;
-	xpparam_t xpp;
-	xdemitconf_t xecfg;
+
 	memset(&d, 0, sizeof(d));
 	d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
 	/*
@@ -943,12 +955,8 @@ static void find_copy_in_blob(struct scoreboard *sb,
 	 * file_o is a part of final image we are annotating.
 	 * file_p partially may match that image.
 	 */
-	memset(&xpp, 0, sizeof(xpp));
-	xpp.flags = xdl_opts;
-	memset(&xecfg, 0, sizeof(xecfg));
-	xecfg.ctxlen = 1;
 	memset(split, 0, sizeof(struct blame_entry [3]));
-	xdi_diff_hunks(file_p, &file_o, handle_split_cb, &d, &xpp, &xecfg);
+	diff_hunks(file_p, &file_o, 1, handle_split_cb, &d);
 	/* remainder, if any, all match the preimage */
 	handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
 }
@@ -1065,8 +1073,7 @@ static int find_copy_in_parent(struct scoreboard *sb,
 
 	paths[0] = NULL;
 	diff_tree_setup_paths(paths, &diff_opts);
-	if (diff_setup_done(&diff_opts) < 0)
-		die("diff-setup");
+	diff_setup_done(&diff_opts);
 
 	/* Try "find copies harder" on new path if requested;
 	 * we do not want to use diffcore_rename() actually to
@@ -1828,6 +1835,16 @@ static int read_ancestry(const char *graft_file)
 	return 0;
 }
 
+static int update_auto_abbrev(int auto_abbrev, struct origin *suspect)
+{
+	const char *uniq = find_unique_abbrev(suspect->commit->object.sha1,
+					      auto_abbrev);
+	int len = strlen(uniq);
+	if (auto_abbrev < len)
+		return len;
+	return auto_abbrev;
+}
+
 /*
  * How many columns do we need to show line numbers, authors,
  * and filenames?
@@ -1838,12 +1855,16 @@ static void find_alignment(struct scoreboard *sb, int *option)
 	int longest_dst_lines = 0;
 	unsigned largest_score = 0;
 	struct blame_entry *e;
+	int compute_auto_abbrev = (abbrev < 0);
+	int auto_abbrev = default_abbrev;
 
 	for (e = sb->ent; e; e = e->next) {
 		struct origin *suspect = e->suspect;
 		struct commit_info ci;
 		int num;
 
+		if (compute_auto_abbrev)
+			auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
 		if (strcmp(suspect->path, sb->path))
 			*option |= OUTPUT_SHOW_NAME;
 		num = strlen(suspect->path);
@@ -1871,6 +1892,10 @@ static void find_alignment(struct scoreboard *sb, int *option)
 	max_orig_digits = decimal_width(longest_src_lines);
 	max_digits = decimal_width(longest_dst_lines);
 	max_score_digits = decimal_width(largest_score);
+
+	if (compute_auto_abbrev)
+		/* one more abbrev length is needed for the boundary commit */
+		abbrev = auto_abbrev + 1;
 }
 
 /*
@@ -2044,6 +2069,55 @@ static int git_blame_config(const char *var, const char *value, void *cb)
 	return git_default_config(var, value, cb);
 }
 
+static void verify_working_tree_path(struct commit *work_tree, const char *path)
+{
+	struct commit_list *parents;
+
+	for (parents = work_tree->parents; parents; parents = parents->next) {
+		const unsigned char *commit_sha1 = parents->item->object.sha1;
+		unsigned char blob_sha1[20];
+		unsigned mode;
+
+		if (!get_tree_entry(commit_sha1, path, blob_sha1, &mode) &&
+		    sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
+			return;
+	}
+	die("no such path '%s' in HEAD", path);
+}
+
+static struct commit_list **append_parent(struct commit_list **tail, const unsigned char *sha1)
+{
+	struct commit *parent;
+
+	parent = lookup_commit_reference(sha1);
+	if (!parent)
+		die("no such commit %s", sha1_to_hex(sha1));
+	return &commit_list_insert(parent, tail)->next;
+}
+
+static void append_merge_parents(struct commit_list **tail)
+{
+	int merge_head;
+	const char *merge_head_file = git_path("MERGE_HEAD");
+	struct strbuf line = STRBUF_INIT;
+
+	merge_head = open(merge_head_file, O_RDONLY);
+	if (merge_head < 0) {
+		if (errno == ENOENT)
+			return;
+		die("cannot open '%s' for reading", merge_head_file);
+	}
+
+	while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
+		unsigned char sha1[20];
+		if (line.len < 40 || get_sha1_hex(line.buf, sha1))
+			die("unknown line in '%s': %s", merge_head_file, line.buf);
+		tail = append_parent(tail, sha1);
+	}
+	close(merge_head);
+	strbuf_release(&line);
+}
+
 /*
  * Prepare a dummy commit that represents the work tree (or staged) item.
  * Note that annotating work tree item never works in the reverse.
@@ -2054,6 +2128,7 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 {
 	struct commit *commit;
 	struct origin *origin;
+	struct commit_list **parent_tail, *parent;
 	unsigned char head_sha1[20];
 	struct strbuf buf = STRBUF_INIT;
 	const char *ident;
@@ -2061,20 +2136,38 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 	int size, len;
 	struct cache_entry *ce;
 	unsigned mode;
-
-	if (get_sha1("HEAD", head_sha1))
-		die("No such ref: HEAD");
+	struct strbuf msg = STRBUF_INIT;
 
 	time(&now);
 	commit = xcalloc(1, sizeof(*commit));
-	commit->parents = xcalloc(1, sizeof(*commit->parents));
-	commit->parents->item = lookup_commit_reference(head_sha1);
 	commit->object.parsed = 1;
 	commit->date = now;
 	commit->object.type = OBJ_COMMIT;
+	parent_tail = &commit->parents;
+
+	if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL))
+		die("no such ref: HEAD");
+
+	parent_tail = append_parent(parent_tail, head_sha1);
+	append_merge_parents(parent_tail);
+	verify_working_tree_path(commit, path);
 
 	origin = make_origin(commit, path);
 
+	ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
+	strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
+	for (parent = commit->parents; parent; parent = parent->next)
+		strbuf_addf(&msg, "parent %s\n",
+			    sha1_to_hex(parent->item->object.sha1));
+	strbuf_addf(&msg,
+		    "author %s\n"
+		    "committer %s\n\n"
+		    "Version of %s from %s\n",
+		    ident, ident, path,
+		    (!contents_from ? path :
+		     (!strcmp(contents_from, "-") ? "standard input" : contents_from)));
+	commit->buffer = strbuf_detach(&msg, NULL);
+
 	if (!contents_from || strcmp("-", contents_from)) {
 		struct stat st;
 		const char *read_from;
@@ -2096,7 +2189,7 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 		switch (st.st_mode & S_IFMT) {
 		case S_IFREG:
 			if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
-			    textconv_object(read_from, mode, null_sha1, &buf_ptr, &buf_len))
+			    textconv_object(read_from, mode, null_sha1, 0, &buf_ptr, &buf_len))
 				strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1);
 			else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size)
 				die_errno("cannot open or read '%s'", read_from);
@@ -2111,7 +2204,6 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 	}
 	else {
 		/* Reading from stdin */
-		contents_from = "standard input";
 		mode = 0;
 		if (strbuf_read(&buf, 0, 0) < 0)
 			die_errno("failed to read from stdin");
@@ -2144,7 +2236,8 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 	ce = xcalloc(1, size);
 	hashcpy(ce->sha1, origin->blob_sha1);
 	memcpy(ce->name, path, len);
-	ce->ce_flags = create_ce_flags(len, 0);
+	ce->ce_flags = create_ce_flags(0);
+	ce->ce_namelen = len;
 	ce->ce_mode = create_ce_mode(mode);
 	add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
 
@@ -2155,16 +2248,6 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 	 */
 	cache_tree_invalidate_path(active_cache_tree, path);
 
-	commit->buffer = xmalloc(400);
-	ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
-	snprintf(commit->buffer, 400,
-		"tree 0000000000000000000000000000000000000000\n"
-		"parent %s\n"
-		"author %s\n"
-		"committer %s\n\n"
-		"Version of %s from %s\n",
-		sha1_to_hex(head_sha1),
-		ident, ident, path, contents_from ? contents_from : path);
 	return commit;
 }
 
@@ -2287,27 +2370,27 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 	static const char *revs_file = NULL;
 	static const char *contents_from = NULL;
 	static const struct option options[] = {
-		OPT_BOOLEAN(0, "incremental", &incremental, "Show blame entries as we find them, incrementally"),
-		OPT_BOOLEAN('b', NULL, &blank_boundary, "Show blank SHA-1 for boundary commits (Default: off)"),
-		OPT_BOOLEAN(0, "root", &show_root, "Do not treat root commits as boundaries (Default: off)"),
-		OPT_BOOLEAN(0, "show-stats", &show_stats, "Show work cost statistics"),
-		OPT_BIT(0, "score-debug", &output_option, "Show output score for blame entries", OUTPUT_SHOW_SCORE),
-		OPT_BIT('f', "show-name", &output_option, "Show original filename (Default: auto)", OUTPUT_SHOW_NAME),
-		OPT_BIT('n', "show-number", &output_option, "Show original linenumber (Default: off)", OUTPUT_SHOW_NUMBER),
-		OPT_BIT('p', "porcelain", &output_option, "Show in a format designed for machine consumption", OUTPUT_PORCELAIN),
-		OPT_BIT(0, "line-porcelain", &output_option, "Show porcelain format with per-line commit information", OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
-		OPT_BIT('c', NULL, &output_option, "Use the same output mode as git-annotate (Default: off)", OUTPUT_ANNOTATE_COMPAT),
-		OPT_BIT('t', NULL, &output_option, "Show raw timestamp (Default: off)", OUTPUT_RAW_TIMESTAMP),
-		OPT_BIT('l', NULL, &output_option, "Show long commit SHA1 (Default: off)", OUTPUT_LONG_OBJECT_NAME),
-		OPT_BIT('s', NULL, &output_option, "Suppress author name and timestamp (Default: off)", OUTPUT_NO_AUTHOR),
-		OPT_BIT('e', "show-email", &output_option, "Show author email instead of name (Default: off)", OUTPUT_SHOW_EMAIL),
-		OPT_BIT('w', NULL, &xdl_opts, "Ignore whitespace differences", XDF_IGNORE_WHITESPACE),
-		OPT_BIT(0, "minimal", &xdl_opts, "Spend extra cycles to find better match", XDF_NEED_MINIMAL),
-		OPT_STRING('S', NULL, &revs_file, "file", "Use revisions from <file> instead of calling git-rev-list"),
-		OPT_STRING(0, "contents", &contents_from, "file", "Use <file>'s contents as the final image"),
-		{ OPTION_CALLBACK, 'C', NULL, &opt, "score", "Find line copies within and across files", PARSE_OPT_OPTARG, blame_copy_callback },
-		{ OPTION_CALLBACK, 'M', NULL, &opt, "score", "Find line movements within and across files", PARSE_OPT_OPTARG, blame_move_callback },
-		OPT_CALLBACK('L', NULL, &bottomtop, "n,m", "Process only line range n,m, counting from 1", blame_bottomtop_callback),
+		OPT_BOOLEAN(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
+		OPT_BOOLEAN('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
+		OPT_BOOLEAN(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
+		OPT_BOOLEAN(0, "show-stats", &show_stats, N_("Show work cost statistics")),
+		OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
+		OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
+		OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
+		OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
+		OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
+		OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
+		OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
+		OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
+		OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
+		OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
+		OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
+		OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
+		OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
+		OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
+		{ OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
+		{ OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
+		OPT_CALLBACK('L', NULL, &bottomtop, N_("n,m"), N_("Process only line range n,m, counting from 1"), blame_bottomtop_callback),
 		OPT__ABBREV(&abbrev),
 		OPT_END()
 	};
@@ -2344,10 +2427,9 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 parse_done:
 	argc = parse_options_end(&ctx);
 
-	if (abbrev == -1)
-		abbrev = default_abbrev;
-	/* one more abbrev length is needed for the boundary commit */
-	abbrev++;
+	if (0 < abbrev)
+		/* one more abbrev length is needed for the boundary commit */
+		abbrev++;
 
 	if (revs_file && read_ancestry(revs_file))
 		die_errno("reading graft file '%s' failed", revs_file);
@@ -2489,7 +2571,7 @@ parse_done:
 			die("no such path %s in %s", path, final_commit_name);
 
 		if (DIFF_OPT_TST(&sb.revs->diffopt, ALLOW_TEXTCONV) &&
-		    textconv_object(path, o->mode, o->blob_sha1, (char **) &sb.final_buf,
+		    textconv_object(path, o->mode, o->blob_sha1, 1, (char **) &sb.final_buf,
 				    &sb.final_buf_size))
 			;
 		else
diff --git a/builtin/branch.c b/builtin/branch.c
index d8cccf72..ffd26849 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -15,12 +15,15 @@
 #include "branch.h"
 #include "diff.h"
 #include "revision.h"
+#include "string-list.h"
+#include "column.h"
+#include "utf8.h"
 
 static const char * const builtin_branch_usage[] = {
-	"git branch [options] [-r | -a] [--merged | --no-merged]",
-	"git branch [options] [-l] [-f] <branchname> [<start-point>]",
-	"git branch [options] [-r] (-d | -D) <branchname>...",
-	"git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
+	N_("git branch [options] [-r | -a] [--merged | --no-merged]"),
+	N_("git branch [options] [-l] [-f] <branchname> [<start-point>]"),
+	N_("git branch [options] [-r] (-d | -D) <branchname>..."),
+	N_("git branch [options] (-m | -M) [<oldbranch>] <newbranch>"),
 	NULL
 };
 
@@ -53,6 +56,9 @@ static enum merge_filter {
 } merge_filter;
 static unsigned char merge_filter_ref[20];
 
+static struct string_list output = STRING_LIST_INIT_DUP;
+static unsigned int colopts;
+
 static int parse_branch_color_slot(const char *var, int ofs)
 {
 	if (!strcasecmp(var+ofs, "plain"))
@@ -70,6 +76,8 @@ static int parse_branch_color_slot(const char *var, int ofs)
 
 static int git_branch_config(const char *var, const char *value, void *cb)
 {
+	if (!prefixcmp(var, "column."))
+		return git_column_config(var, value, "branch", &colopts);
 	if (!strcmp(var, "color.branch")) {
 		branch_use_color = git_config_colorbool(var, value);
 		return 0;
@@ -122,7 +130,7 @@ static int branch_merged(int kind, const char *name,
 	if (!reference_rev)
 		reference_rev = head_rev;
 
-	merged = in_merge_bases(rev, &reference_rev, 1);
+	merged = in_merge_bases(rev, reference_rev);
 
 	/*
 	 * After the safety valve is fully redefined to "check with
@@ -132,7 +140,7 @@ static int branch_merged(int kind, const char *name,
 	 * a gentle reminder is in order.
 	 */
 	if ((head_rev != reference_rev) &&
-	    in_merge_bases(rev, &head_rev, 1) != merged) {
+	    in_merge_bases(rev, head_rev) != merged) {
 		if (merged)
 			warning(_("deleting branch '%s' that has been merged to\n"
 				"         '%s', but not yet merged to HEAD."),
@@ -146,26 +154,28 @@ static int branch_merged(int kind, const char *name,
 	return merged;
 }
 
-static int delete_branches(int argc, const char **argv, int force, int kinds)
+static int delete_branches(int argc, const char **argv, int force, int kinds,
+			   int quiet)
 {
 	struct commit *rev, *head_rev = NULL;
 	unsigned char sha1[20];
 	char *name = NULL;
-	const char *fmt, *remote;
+	const char *fmt;
 	int i;
 	int ret = 0;
+	int remote_branch = 0;
 	struct strbuf bname = STRBUF_INIT;
 
 	switch (kinds) {
 	case REF_REMOTE_BRANCH:
 		fmt = "refs/remotes/%s";
-		/* TRANSLATORS: This is "remote " in "remote branch '%s' not found" */
-		remote = _("remote ");
+		/* For subsequent UI messages */
+		remote_branch = 1;
+
 		force = 1;
 		break;
 	case REF_LOCAL_BRANCH:
 		fmt = "refs/heads/%s";
-		remote = "";
 		break;
 	default:
 		die(_("cannot use -a with -d"));
@@ -187,10 +197,11 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
 
 		free(name);
 
-		name = xstrdup(mkpath(fmt, bname.buf));
+		name = mkpathdup(fmt, bname.buf);
 		if (read_ref(name, sha1)) {
-			error(_("%sbranch '%s' not found."),
-					remote, bname.buf);
+			error(remote_branch
+			      ? _("remote branch '%s' not found.")
+			      : _("branch '%s' not found."), bname.buf);
 			ret = 1;
 			continue;
 		}
@@ -211,14 +222,19 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
 		}
 
 		if (delete_ref(name, sha1, 0)) {
-			error(_("Error deleting %sbranch '%s'"), remote,
+			error(remote_branch
+			      ? _("Error deleting remote branch '%s'")
+			      : _("Error deleting branch '%s'"),
 			      bname.buf);
 			ret = 1;
 		} else {
 			struct strbuf buf = STRBUF_INIT;
-			printf(_("Deleted %sbranch %s (was %s).\n"), remote,
-			       bname.buf,
-			       find_unique_abbrev(sha1, DEFAULT_ABBREV));
+			if (!quiet)
+				printf(remote_branch
+				       ? _("Deleted remote branch %s (was %s).\n")
+				       : _("Deleted branch %s (was %s).\n"),
+				       bname.buf,
+				       find_unique_abbrev(sha1, DEFAULT_ABBREV));
 			strbuf_addf(&buf, "branch.%s", bname.buf);
 			if (git_config_rename_section(buf.buf, NULL) < 0)
 				warning(_("Update of config-file failed"));
@@ -234,7 +250,7 @@ static int delete_branches(int argc, const char **argv, int force, int kinds)
 struct ref_item {
 	char *name;
 	char *dest;
-	unsigned int kind, len;
+	unsigned int kind, width;
 	struct commit *commit;
 };
 
@@ -339,14 +355,14 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
 	newitem->name = xstrdup(refname);
 	newitem->kind = kind;
 	newitem->commit = commit;
-	newitem->len = strlen(refname);
+	newitem->width = utf8_strwidth(refname);
 	newitem->dest = resolve_symref(orig_refname, prefix);
 	/* adjust for "remotes/" */
 	if (newitem->kind == REF_REMOTE_BRANCH &&
 	    ref_list->kinds != REF_REMOTE_BRANCH)
-		newitem->len += 8;
-	if (newitem->len > ref_list->maxwidth)
-		ref_list->maxwidth = newitem->len;
+		newitem->width += 8;
+	if (newitem->width > ref_list->maxwidth)
+		ref_list->maxwidth = newitem->width;
 
 	return 0;
 }
@@ -376,6 +392,7 @@ static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
 		int show_upstream_ref)
 {
 	int ours, theirs;
+	char *ref = NULL;
 	struct branch *branch = branch_get(branch_name);
 
 	if (!stat_tracking_info(branch, &ours, &theirs)) {
@@ -386,16 +403,29 @@ static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
 		return;
 	}
 
-	strbuf_addch(stat, '[');
 	if (show_upstream_ref)
-		strbuf_addf(stat, "%s: ",
-			shorten_unambiguous_ref(branch->merge[0]->dst, 0));
-	if (!ours)
-		strbuf_addf(stat, _("behind %d] "), theirs);
-	else if (!theirs)
-		strbuf_addf(stat, _("ahead %d] "), ours);
-	else
-		strbuf_addf(stat, _("ahead %d, behind %d] "), ours, theirs);
+		ref = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
+	if (!ours) {
+		if (ref)
+			strbuf_addf(stat, _("[%s: behind %d]"), ref, theirs);
+		else
+			strbuf_addf(stat, _("[behind %d]"), theirs);
+
+	} else if (!theirs) {
+		if (ref)
+			strbuf_addf(stat, _("[%s: ahead %d]"), ref, ours);
+		else
+			strbuf_addf(stat, _("[ahead %d]"), ours);
+	} else {
+		if (ref)
+			strbuf_addf(stat, _("[%s: ahead %d, behind %d]"),
+				    ref, ours, theirs);
+		else
+			strbuf_addf(stat, _("[ahead %d, behind %d]"),
+				    ours, theirs);
+	}
+	strbuf_addch(stat, ' ');
+	free(ref);
 }
 
 static int matches_merge_filter(struct commit *commit)
@@ -461,11 +491,12 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 	}
 
 	strbuf_addf(&name, "%s%s", prefix, item->name);
-	if (verbose)
+	if (verbose) {
+		int utf8_compensation = strlen(name.buf) - utf8_strwidth(name.buf);
 		strbuf_addf(&out, "%c %s%-*s%s", c, branch_get_color(color),
-			    maxwidth, name.buf,
+			    maxwidth + utf8_compensation, name.buf,
 			    branch_get_color(BRANCH_COLOR_RESET));
-	else
+	} else
 		strbuf_addf(&out, "%c %s%s%s", c, branch_get_color(color),
 			    name.buf, branch_get_color(BRANCH_COLOR_RESET));
 
@@ -474,7 +505,12 @@ static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 	else if (verbose)
 		/* " f7c0c00 [ahead 58, behind 197] vcs-svn: drop obj_pool.h" */
 		add_verbose_info(&out, item, verbose, abbrev);
-	printf("%s\n", out.buf);
+	if (column_active(colopts)) {
+		assert(!verbose && "--column and --verbose are incompatible");
+		string_list_append(&output, out.buf);
+	} else {
+		printf("%s\n", out.buf);
+	}
 	strbuf_release(&name);
 	strbuf_release(&out);
 }
@@ -485,8 +521,8 @@ static int calc_maxwidth(struct ref_list *refs)
 	for (i = 0; i < refs->index; i++) {
 		if (!matches_merge_filter(refs->list[i].commit))
 			continue;
-		if (refs->list[i].len > w)
-			w = refs->list[i].len;
+		if (refs->list[i].width > w)
+			w = refs->list[i].width;
 	}
 	return w;
 }
@@ -499,12 +535,12 @@ static void show_detached(struct ref_list *ref_list)
 	if (head_commit && is_descendant_of(head_commit, ref_list->with_commit)) {
 		struct ref_item item;
 		item.name = xstrdup(_("(no branch)"));
-		item.len = strlen(item.name);
+		item.width = utf8_strwidth(item.name);
 		item.kind = REF_LOCAL_BRANCH;
 		item.dest = NULL;
 		item.commit = head_commit;
-		if (item.len > ref_list->maxwidth)
-			ref_list->maxwidth = item.len;
+		if (item.width > ref_list->maxwidth)
+			ref_list->maxwidth = item.width;
 		print_ref_item(&item, ref_list->maxwidth, ref_list->verbose, ref_list->abbrev, 1, "");
 		free(item.name);
 	}
@@ -655,7 +691,7 @@ static int edit_branch_description(const char *branch_name)
 	fp = fopen(git_path(edit_description), "w");
 	if ((fwrite(buf.buf, 1, buf.len, fp) < buf.len) || fclose(fp)) {
 		strbuf_release(&buf);
-		return error(_("could not write branch description template: %s\n"),
+		return error(_("could not write branch description template: %s"),
 			     strerror(errno));
 	}
 	strbuf_reset(&buf);
@@ -678,59 +714,65 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	int delete = 0, rename = 0, force_create = 0, list = 0;
 	int verbose = 0, abbrev = -1, detached = 0;
 	int reflog = 0, edit_description = 0;
+	int quiet = 0, unset_upstream = 0;
+	const char *new_upstream = NULL;
 	enum branch_track track;
 	int kinds = REF_LOCAL_BRANCH;
 	struct commit_list *with_commit = NULL;
 
 	struct option options[] = {
-		OPT_GROUP("Generic options"),
+		OPT_GROUP(N_("Generic options")),
 		OPT__VERBOSE(&verbose,
-			"show hash and subject, give twice for upstream branch"),
-		OPT_SET_INT('t', "track",  &track, "set up tracking mode (see git-pull(1))",
+			N_("show hash and subject, give twice for upstream branch")),
+		OPT__QUIET(&quiet, N_("suppress informational messages")),
+		OPT_SET_INT('t', "track",  &track, N_("set up tracking mode (see git-pull(1))"),
 			BRANCH_TRACK_EXPLICIT),
-		OPT_SET_INT( 0, "set-upstream",  &track, "change upstream info",
+		OPT_SET_INT( 0, "set-upstream",  &track, N_("change upstream info"),
 			BRANCH_TRACK_OVERRIDE),
-		OPT__COLOR(&branch_use_color, "use colored output"),
-		OPT_SET_INT('r', "remotes",     &kinds, "act on remote-tracking branches",
+		OPT_STRING('u', "set-upstream-to", &new_upstream, "upstream", "change the upstream info"),
+		OPT_BOOLEAN(0, "unset-upstream", &unset_upstream, "Unset the upstream info"),
+		OPT__COLOR(&branch_use_color, N_("use colored output")),
+		OPT_SET_INT('r', "remotes",     &kinds, N_("act on remote-tracking branches"),
 			REF_REMOTE_BRANCH),
 		{
-			OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
-			"print only branches that contain the commit",
+			OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
+			N_("print only branches that contain the commit"),
 			PARSE_OPT_LASTARG_DEFAULT,
 			parse_opt_with_commit, (intptr_t)"HEAD",
 		},
 		{
-			OPTION_CALLBACK, 0, "with", &with_commit, "commit",
-			"print only branches that contain the commit",
+			OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
+			N_("print only branches that contain the commit"),
 			PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 			parse_opt_with_commit, (intptr_t) "HEAD",
 		},
 		OPT__ABBREV(&abbrev),
 
-		OPT_GROUP("Specific git-branch actions:"),
-		OPT_SET_INT('a', "all", &kinds, "list both remote-tracking and local branches",
+		OPT_GROUP(N_("Specific git-branch actions:")),
+		OPT_SET_INT('a', "all", &kinds, N_("list both remote-tracking and local branches"),
 			REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
-		OPT_BIT('d', "delete", &delete, "delete fully merged branch", 1),
-		OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
-		OPT_BIT('m', "move", &rename, "move/rename a branch and its reflog", 1),
-		OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
-		OPT_BOOLEAN(0, "list", &list, "list branch names"),
-		OPT_BOOLEAN('l', "create-reflog", &reflog, "create the branch's reflog"),
+		OPT_BIT('d', "delete", &delete, N_("delete fully merged branch"), 1),
+		OPT_BIT('D', NULL, &delete, N_("delete branch (even if not merged)"), 2),
+		OPT_BIT('m', "move", &rename, N_("move/rename a branch and its reflog"), 1),
+		OPT_BIT('M', NULL, &rename, N_("move/rename a branch, even if target exists"), 2),
+		OPT_BOOLEAN(0, "list", &list, N_("list branch names")),
+		OPT_BOOLEAN('l', "create-reflog", &reflog, N_("create the branch's reflog")),
 		OPT_BOOLEAN(0, "edit-description", &edit_description,
-			    "edit the description for the branch"),
-		OPT__FORCE(&force_create, "force creation (when already exists)"),
+			    N_("edit the description for the branch")),
+		OPT__FORCE(&force_create, N_("force creation (when already exists)")),
 		{
 			OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
-			"commit", "print only not merged branches",
+			N_("commit"), N_("print only not merged branches"),
 			PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 			opt_parse_merge_filter, (intptr_t) "HEAD",
 		},
 		{
 			OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
-			"commit", "print only merged branches",
+			N_("commit"), N_("print only merged branches"),
 			PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 			opt_parse_merge_filter, (intptr_t) "HEAD",
 		},
+		OPT_COLUMN(0, "column", &colopts, N_("list branches in columns")),
 		OPT_END(),
 	};
 
@@ -753,23 +795,34 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	}
 	hashcpy(merge_filter_ref, head_sha1);
 
+
 	argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
 			     0);
 
-	if (!delete && !rename && !edit_description && argc == 0)
+	if (!delete && !rename && !edit_description && !new_upstream && !unset_upstream && argc == 0)
 		list = 1;
 
-	if (!!delete + !!rename + !!force_create + !!list > 1)
+	if (!!delete + !!rename + !!force_create + !!list + !!new_upstream + !!unset_upstream > 1)
 		usage_with_options(builtin_branch_usage, options);
 
 	if (abbrev == -1)
 		abbrev = DEFAULT_ABBREV;
+	finalize_colopts(&colopts, -1);
+	if (verbose) {
+		if (explicitly_enable_column(colopts))
+			die(_("--column and --verbose are incompatible"));
+		colopts = 0;
+	}
 
 	if (delete)
-		return delete_branches(argc, argv, delete > 1, kinds);
-	else if (list)
-		return print_ref_list(kinds, detached, verbose, abbrev,
-				      with_commit, argv);
+		return delete_branches(argc, argv, delete > 1, kinds, quiet);
+	else if (list) {
+		int ret = print_ref_list(kinds, detached, verbose, abbrev,
+					 with_commit, argv);
+		print_columns(&output, colopts, NULL);
+		string_list_clear(&output, 0);
+		return ret;
+	}
 	else if (edit_description) {
 		const char *branch_name;
 		struct strbuf branch_ref = STRBUF_INIT;
@@ -804,11 +857,62 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 			rename_branch(argv[0], argv[1], rename > 1);
 		else
 			usage_with_options(builtin_branch_usage, options);
+	} else if (new_upstream) {
+		struct branch *branch = branch_get(argv[0]);
+
+		if (!ref_exists(branch->refname))
+			die(_("branch '%s' does not exist"), branch->name);
+
+		/*
+		 * create_branch takes care of setting up the tracking
+		 * info and making sure new_upstream is correct
+		 */
+		create_branch(head, branch->name, new_upstream, 0, 0, 0, quiet, BRANCH_TRACK_OVERRIDE);
+	} else if (unset_upstream) {
+		struct branch *branch = branch_get(argv[0]);
+		struct strbuf buf = STRBUF_INIT;
+
+		if (!branch_has_merge_config(branch)) {
+			die(_("Branch '%s' has no upstream information"), branch->name);
+		}
+
+		strbuf_addf(&buf, "branch.%s.remote", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, 1);
+		strbuf_reset(&buf);
+		strbuf_addf(&buf, "branch.%s.merge", branch->name);
+		git_config_set_multivar(buf.buf, NULL, NULL, 1);
+		strbuf_release(&buf);
 	} else if (argc > 0 && argc <= 2) {
+		struct branch *branch = branch_get(argv[0]);
+		int branch_existed = 0, remote_tracking = 0;
+		struct strbuf buf = STRBUF_INIT;
+
 		if (kinds != REF_LOCAL_BRANCH)
 			die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
+
+		if (track == BRANCH_TRACK_OVERRIDE)
+			fprintf(stderr, _("The --set-upstream flag is deprecated and will be removed. Consider using --track or --set-upstream-to\n"));
+
+		strbuf_addf(&buf, "refs/remotes/%s", branch->name);
+		remote_tracking = ref_exists(buf.buf);
+		strbuf_release(&buf);
+
+		branch_existed = ref_exists(branch->refname);
 		create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
-			      force_create, reflog, 0, track);
+			      force_create, reflog, 0, quiet, track);
+
+		/*
+		 * We only show the instructions if the user gave us
+		 * one branch which doesn't exist locally, but is the
+		 * name of a remote-tracking branch.
+		 */
+		if (argc == 1 && track == BRANCH_TRACK_OVERRIDE &&
+		    !branch_existed && remote_tracking) {
+			fprintf(stderr, _("\nIf you wanted to make '%s' track '%s', do this:\n\n"), head, branch->name);
+			fprintf(stderr, _("    git branch -d %s\n"), branch->name);
+			fprintf(stderr, _("    git branch --set-upstream-to %s\n"), branch->name);
+		}
+
 	} else
 		usage_with_options(builtin_branch_usage, options);
 
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 8ed501f2..00528ddc 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -11,6 +11,7 @@
 #include "parse-options.h"
 #include "diff.h"
 #include "userdiff.h"
+#include "streaming.h"
 
 #define BATCH 1
 #define BATCH_CHECK 2
@@ -90,7 +91,7 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 	unsigned long size;
 	struct object_context obj_context;
 
-	if (get_sha1_with_context(obj_name, sha1, &obj_context))
+	if (get_sha1_with_context(obj_name, 0, sha1, &obj_context))
 		die("Not a valid object name %s", obj_name);
 
 	buf = NULL;
@@ -127,6 +128,8 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 			return cmd_ls_tree(2, ls_args, NULL);
 		}
 
+		if (type == OBJ_BLOB)
+			return stream_blob_to_fd(1, sha1, NULL, 0);
 		buf = read_sha1_file(sha1, &type, &size);
 		if (!buf)
 			die("Cannot read object %s", obj_name);
@@ -143,12 +146,34 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 			die("git cat-file --textconv %s: <object> must be <sha1:path>",
 			    obj_name);
 
-		if (!textconv_object(obj_context.path, obj_context.mode, sha1, &buf, &size))
+		if (!textconv_object(obj_context.path, obj_context.mode, sha1, 1, &buf, &size))
 			die("git cat-file --textconv: unable to run textconv on %s",
 			    obj_name);
 		break;
 
 	case 0:
+		if (type_from_string(exp_type) == OBJ_BLOB) {
+			unsigned char blob_sha1[20];
+			if (sha1_object_info(sha1, NULL) == OBJ_TAG) {
+				enum object_type type;
+				unsigned long size;
+				char *buffer = read_sha1_file(sha1, &type, &size);
+				if (memcmp(buffer, "object ", 7) ||
+				    get_sha1_hex(buffer + 7, blob_sha1))
+					die("%s not a valid tag", sha1_to_hex(sha1));
+				free(buffer);
+			} else
+				hashcpy(blob_sha1, sha1);
+
+			if (sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
+				return stream_blob_to_fd(1, blob_sha1, NULL, 0);
+			/*
+			 * we attempted to dereference a tag to a blob
+			 * and failed; there may be new dereference
+			 * mechanisms this code is not aware of.
+			 * fall-back to the usual case.
+			 */
+		}
 		buf = read_object_with_reference(sha1, exp_type, &size, NULL);
 		break;
 
@@ -219,8 +244,8 @@ static int batch_objects(int print_contents)
 }
 
 static const char * const cat_file_usage[] = {
-	"git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>",
-	"git cat-file (--batch|--batch-check) < <list_of_objects>",
+	N_("git cat-file (-t|-s|-e|-p|<type>|--textconv) <object>"),
+	N_("git cat-file (--batch|--batch-check) < <list_of_objects>"),
 	NULL
 };
 
@@ -238,19 +263,19 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 	const char *exp_type = NULL, *obj_name = NULL;
 
 	const struct option options[] = {
-		OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
-		OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
-		OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
+		OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
+		OPT_SET_INT('t', NULL, &opt, N_("show object type"), 't'),
+		OPT_SET_INT('s', NULL, &opt, N_("show object size"), 's'),
 		OPT_SET_INT('e', NULL, &opt,
-			    "exit with zero when there's no error", 'e'),
-		OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
+			    N_("exit with zero when there's no error"), 'e'),
+		OPT_SET_INT('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
 		OPT_SET_INT(0, "textconv", &opt,
-			    "for blob objects, run textconv on object's content", 'c'),
+			    N_("for blob objects, run textconv on object's content"), 'c'),
 		OPT_SET_INT(0, "batch", &batch,
-			    "show info and content of objects fed from the standard input",
+			    N_("show info and content of objects fed from the standard input"),
 			    BATCH),
 		OPT_SET_INT(0, "batch-check", &batch,
-			    "show info about objects fed from the standard input",
+			    N_("show info about objects fed from the standard input"),
 			    BATCH_CHECK),
 		OPT_END()
 	};
diff --git a/builtin/check-attr.c b/builtin/check-attr.c
index 44c421eb..075d01d3 100644
--- a/builtin/check-attr.c
+++ b/builtin/check-attr.c
@@ -8,19 +8,19 @@ static int all_attrs;
 static int cached_attrs;
 static int stdin_paths;
 static const char * const check_attr_usage[] = {
-"git check-attr [-a | --all | attr...] [--] pathname...",
-"git check-attr --stdin [-a | --all | attr...] < <list-of-paths>",
+N_("git check-attr [-a | --all | attr...] [--] pathname..."),
+N_("git check-attr --stdin [-z] [-a | --all | attr...] < <list-of-paths>"),
 NULL
 };
 
 static int null_term_line;
 
 static const struct option check_attr_options[] = {
-	OPT_BOOLEAN('a', "all", &all_attrs, "report all attributes set on file"),
-	OPT_BOOLEAN(0,  "cached", &cached_attrs, "use .gitattributes only from the index"),
-	OPT_BOOLEAN(0 , "stdin", &stdin_paths, "read file names from stdin"),
+	OPT_BOOLEAN('a', "all", &all_attrs, N_("report all attributes set on file")),
+	OPT_BOOLEAN(0,  "cached", &cached_attrs, N_("use .gitattributes only from the index")),
+	OPT_BOOLEAN(0 , "stdin", &stdin_paths, N_("read file names from stdin")),
 	OPT_BOOLEAN('z', NULL, &null_term_line,
-		"input paths are terminated by a null character"),
+		N_("input paths are terminated by a null character")),
 	OPT_END()
 };
 
diff --git a/builtin/checkout-index.c b/builtin/checkout-index.c
index c16d82b7..b1feda7d 100644
--- a/builtin/checkout-index.c
+++ b/builtin/checkout-index.c
@@ -123,7 +123,7 @@ static void checkout_all(const char *prefix, int prefix_length)
 }
 
 static const char * const builtin_checkout_index_usage[] = {
-	"git checkout-index [options] [--] [<file>...]",
+	N_("git checkout-index [options] [--] [<file>...]"),
 	NULL
 };
 
@@ -184,27 +184,27 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
 	int force = 0, quiet = 0, not_new = 0;
 	struct option builtin_checkout_index_options[] = {
 		OPT_BOOLEAN('a', "all", &all,
-			"checks out all files in the index"),
-		OPT__FORCE(&force, "forces overwrite of existing files"),
+			N_("check out all files in the index")),
+		OPT__FORCE(&force, N_("force overwrite of existing files")),
 		OPT__QUIET(&quiet,
-			"no warning for existing files and files not in index"),
+			N_("no warning for existing files and files not in index")),
 		OPT_BOOLEAN('n', "no-create", &not_new,
-			"don't checkout new files"),
+			N_("don't checkout new files")),
 		{ OPTION_CALLBACK, 'u', "index", &newfd, NULL,
-			"update stat information in the index file",
+			N_("update stat information in the index file"),
 			PARSE_OPT_NOARG, option_parse_u },
 		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
-			"paths are separated with NUL character",
+			N_("paths are separated with NUL character"),
 			PARSE_OPT_NOARG, option_parse_z },
 		OPT_BOOLEAN(0, "stdin", &read_from_stdin,
-			"read list of paths from the standard input"),
+			N_("read list of paths from the standard input")),
 		OPT_BOOLEAN(0, "temp", &to_tempfile,
-			"write the content to temporary files"),
-		OPT_CALLBACK(0, "prefix", NULL, "string",
-			"when creating files, prepend <string>",
+			N_("write the content to temporary files")),
+		OPT_CALLBACK(0, "prefix", NULL, N_("string"),
+			N_("when creating files, prepend <string>"),
 			option_parse_prefix),
 		OPT_CALLBACK(0, "stage", NULL, NULL,
-			"copy out the files from named stage",
+			N_("copy out the files from named stage"),
 			option_parse_stage),
 		OPT_END()
 	};
diff --git a/builtin/checkout.c b/builtin/checkout.c
index f9f7f40a..781295b2 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -22,29 +22,31 @@
 #include "argv-array.h"
 
 static const char * const checkout_usage[] = {
-	"git checkout [options] <branch>",
-	"git checkout [options] [<branch>] -- <file>...",
+	N_("git checkout [options] <branch>"),
+	N_("git checkout [options] [<branch>] -- <file>..."),
 	NULL,
 };
 
 struct checkout_opts {
+	int patch_mode;
 	int quiet;
 	int merge;
 	int force;
 	int force_detach;
 	int writeout_stage;
-	int writeout_error;
 	int overwrite_ignore;
 
-	/* not set by parse_options */
-	int branch_exists;
-
 	const char *new_branch;
 	const char *new_branch_force;
 	const char *new_orphan_branch;
 	int new_branch_log;
 	enum branch_track track;
 	struct diff_options diff_options;
+
+	int branch_exists;
+	const char *prefix;
+	const char **pathspec;
+	struct tree *source_tree;
 };
 
 static int post_checkout_hook(struct commit *old, struct commit *new,
@@ -73,7 +75,8 @@ static int update_some(const unsigned char *sha1, const char *base, int baselen,
 	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, base, baselen);
 	memcpy(ce->name + baselen, pathname, len - baselen);
-	ce->ce_flags = create_ce_flags(len, 0) | CE_UPDATE;
+	ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
+	ce->ce_namelen = len;
 	ce->ce_mode = create_ce_mode(mode);
 	add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
 	return 0;
@@ -214,8 +217,8 @@ static int checkout_merged(int pos, struct checkout *state)
 	return status;
 }
 
-static int checkout_paths(struct tree *source_tree, const char **pathspec,
-			  const char *prefix, struct checkout_opts *opts)
+static int checkout_paths(const struct checkout_opts *opts,
+			  const char *revision)
 {
 	int pos;
 	struct checkout state;
@@ -227,37 +230,65 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec,
 	int stage = opts->writeout_stage;
 	int merge = opts->merge;
 	int newfd;
-	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct lock_file *lock_file;
+
+	if (opts->track != BRANCH_TRACK_UNSPECIFIED)
+		die(_("'%s' cannot be used with updating paths"), "--track");
+
+	if (opts->new_branch_log)
+		die(_("'%s' cannot be used with updating paths"), "-l");
+
+	if (opts->force && opts->patch_mode)
+		die(_("'%s' cannot be used with updating paths"), "-f");
+
+	if (opts->force_detach)
+		die(_("'%s' cannot be used with updating paths"), "--detach");
+
+	if (opts->merge && opts->patch_mode)
+		die(_("'%s' cannot be used with %s"), "--merge", "--patch");
+
+	if (opts->force && opts->merge)
+		die(_("'%s' cannot be used with %s"), "-f", "-m");
+
+	if (opts->new_branch)
+		die(_("Cannot update paths and switch to branch '%s' at the same time."),
+		    opts->new_branch);
+
+	if (opts->patch_mode)
+		return run_add_interactive(revision, "--patch=checkout",
+					   opts->pathspec);
+
+	lock_file = xcalloc(1, sizeof(struct lock_file));
 
 	newfd = hold_locked_index(lock_file, 1);
-	if (read_cache_preload(pathspec) < 0)
+	if (read_cache_preload(opts->pathspec) < 0)
 		return error(_("corrupt index file"));
 
-	if (source_tree)
-		read_tree_some(source_tree, pathspec);
+	if (opts->source_tree)
+		read_tree_some(opts->source_tree, opts->pathspec);
 
-	for (pos = 0; pathspec[pos]; pos++)
+	for (pos = 0; opts->pathspec[pos]; pos++)
 		;
 	ps_matched = xcalloc(1, pos);
 
 	for (pos = 0; pos < active_nr; pos++) {
 		struct cache_entry *ce = active_cache[pos];
-		if (source_tree && !(ce->ce_flags & CE_UPDATE))
+		if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
 			continue;
-		match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, ps_matched);
+		match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, ps_matched);
 	}
 
-	if (report_path_error(ps_matched, pathspec, prefix))
+	if (report_path_error(ps_matched, opts->pathspec, opts->prefix))
 		return 1;
 
 	/* "checkout -m path" to recreate conflicted state */
 	if (opts->merge)
-		unmerge_cache(pathspec);
+		unmerge_cache(opts->pathspec);
 
 	/* Any unmerged paths? */
 	for (pos = 0; pos < active_nr; pos++) {
 		struct cache_entry *ce = active_cache[pos];
-		if (match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
+		if (match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
 			if (!ce_stage(ce))
 				continue;
 			if (opts->force) {
@@ -282,9 +313,9 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec,
 	state.refresh_cache = 1;
 	for (pos = 0; pos < active_nr; pos++) {
 		struct cache_entry *ce = active_cache[pos];
-		if (source_tree && !(ce->ce_flags & CE_UPDATE))
+		if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
 			continue;
-		if (match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
+		if (match_pathspec(opts->pathspec, ce->name, ce_namelen(ce), 0, NULL)) {
 			if (!ce_stage(ce)) {
 				errs |= checkout_entry(ce, &state, NULL);
 				continue;
@@ -308,15 +339,15 @@ static int checkout_paths(struct tree *source_tree, const char **pathspec,
 	return errs;
 }
 
-static void show_local_changes(struct object *head, struct diff_options *opts)
+static void show_local_changes(struct object *head,
+			       const struct diff_options *opts)
 {
 	struct rev_info rev;
 	/* I think we want full paths, even if we're in a subdirectory. */
 	init_revisions(&rev, NULL);
 	rev.diffopt.flags = opts->flags;
 	rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
-	if (diff_setup_done(&rev.diffopt) < 0)
-		die(_("diff_setup_done failed"));
+	diff_setup_done(&rev.diffopt);
 	add_pending_object(&rev, head, NULL);
 	run_diff_index(&rev, 0);
 }
@@ -331,7 +362,8 @@ static void describe_detached_head(const char *msg, struct commit *commit)
 	strbuf_release(&sb);
 }
 
-static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
+static int reset_tree(struct tree *tree, const struct checkout_opts *o,
+		      int worktree, int *writeout_error)
 {
 	struct unpack_trees_options opts;
 	struct tree_desc tree_desc;
@@ -350,7 +382,7 @@ static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
 	init_tree_desc(&tree_desc, tree->buffer, tree->size);
 	switch (unpack_trees(1, &tree_desc, &opts)) {
 	case -2:
-		o->writeout_error = 1;
+		*writeout_error = 1;
 		/*
 		 * We return 0 nevertheless, as the index is all right
 		 * and more importantly we have made best efforts to
@@ -381,8 +413,10 @@ static void setup_branch_path(struct branch_info *branch)
 	branch->path = strbuf_detach(&buf, NULL);
 }
 
-static int merge_working_tree(struct checkout_opts *opts,
-			      struct branch_info *old, struct branch_info *new)
+static int merge_working_tree(const struct checkout_opts *opts,
+			      struct branch_info *old,
+			      struct branch_info *new,
+			      int *writeout_error)
 {
 	int ret;
 	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
@@ -393,7 +427,7 @@ static int merge_working_tree(struct checkout_opts *opts,
 
 	resolve_undo_clear();
 	if (opts->force) {
-		ret = reset_tree(new->commit->tree, opts, 1);
+		ret = reset_tree(new->commit->tree, opts, 1, writeout_error);
 		if (ret)
 			return ret;
 	} else {
@@ -479,7 +513,8 @@ static int merge_working_tree(struct checkout_opts *opts,
 			o.verbosity = 0;
 			work = write_tree_from_memory(&o);
 
-			ret = reset_tree(new->commit->tree, opts, 1);
+			ret = reset_tree(new->commit->tree, opts, 1,
+					 writeout_error);
 			if (ret)
 				return ret;
 			o.ancestor = old->name;
@@ -487,7 +522,8 @@ static int merge_working_tree(struct checkout_opts *opts,
 			o.branch2 = "local";
 			merge_trees(&o, new->commit->tree, work,
 				old->commit->tree, &result);
-			ret = reset_tree(new->commit->tree, opts, 0);
+			ret = reset_tree(new->commit->tree, opts, 0,
+					 writeout_error);
 			if (ret)
 				return ret;
 		}
@@ -514,7 +550,7 @@ static void report_tracking(struct branch_info *new)
 	strbuf_release(&sb);
 }
 
-static void update_refs_for_switch(struct checkout_opts *opts,
+static void update_refs_for_switch(const struct checkout_opts *opts,
 				   struct branch_info *old,
 				   struct branch_info *new)
 {
@@ -543,6 +579,7 @@ static void update_refs_for_switch(struct checkout_opts *opts,
 				      opts->new_branch_force ? 1 : 0,
 				      opts->new_branch_log,
 				      opts->new_branch_force ? 1 : 0,
+				      opts->quiet,
 				      opts->track);
 		new->name = opts->new_branch;
 		setup_branch_path(new);
@@ -604,7 +641,7 @@ static int add_pending_uninteresting_ref(const char *refname,
 					 const unsigned char *sha1,
 					 int flags, void *cb_data)
 {
-	add_pending_sha1(cb_data, refname, sha1, flags | UNINTERESTING);
+	add_pending_sha1(cb_data, refname, sha1, UNINTERESTING);
 	return 0;
 }
 
@@ -700,13 +737,14 @@ static void orphaned_commit_warning(struct commit *old, struct commit *new)
 	free(refs.objects);
 }
 
-static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
+static int switch_branches(const struct checkout_opts *opts,
+			   struct branch_info *new)
 {
 	int ret = 0;
 	struct branch_info old;
 	void *path_to_free;
 	unsigned char rev[20];
-	int flag;
+	int flag, writeout_error = 0;
 	memset(&old, 0, sizeof(old));
 	old.path = path_to_free = resolve_refdup("HEAD", rev, 0, &flag);
 	old.commit = lookup_commit_reference_gently(rev, 1);
@@ -724,7 +762,7 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
 		parse_commit(new->commit);
 	}
 
-	ret = merge_working_tree(opts, &old, new);
+	ret = merge_working_tree(opts, &old, new, &writeout_error);
 	if (ret) {
 		free(path_to_free);
 		return ret;
@@ -737,7 +775,7 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
 
 	ret = post_checkout_hook(old.commit, new->commit, 1);
 	free(path_to_free);
-	return ret || opts->writeout_error;
+	return ret || writeout_error;
 }
 
 static int git_checkout_config(const char *var, const char *value, void *cb)
@@ -754,12 +792,6 @@ static int git_checkout_config(const char *var, const char *value, void *cb)
 	return git_xmerge_config(var, value, NULL);
 }
 
-static int interactive_checkout(const char *revision, const char **pathspec,
-				struct checkout_opts *opts)
-{
-	return run_add_interactive(revision, "--patch=checkout", pathspec);
-}
-
 struct tracking_name_data {
 	const char *name;
 	char *remote;
@@ -909,49 +941,93 @@ static int parse_branchname_arg(int argc, const char **argv,
 	return argcount;
 }
 
-static int switch_unborn_to_new_branch(struct checkout_opts *opts)
+static int switch_unborn_to_new_branch(const struct checkout_opts *opts)
 {
 	int status;
 	struct strbuf branch_ref = STRBUF_INIT;
 
+	if (!opts->new_branch)
+		die(_("You are on a branch yet to be born"));
 	strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch);
 	status = create_symref("HEAD", branch_ref.buf, "checkout -b");
 	strbuf_release(&branch_ref);
 	return status;
 }
 
+static int checkout_branch(struct checkout_opts *opts,
+			   struct branch_info *new)
+{
+	if (opts->pathspec)
+		die(_("paths cannot be used with switching branches"));
+
+	if (opts->patch_mode)
+		die(_("'%s' cannot be used with switching branches"),
+		    "--patch");
+
+	if (opts->writeout_stage)
+		die(_("'%s' cannot be used with switching branches"),
+		    "--ours/--theirs");
+
+	if (opts->force && opts->merge)
+		die(_("'%s' cannot be used with '%s'"), "-f", "-m");
+
+	if (opts->force_detach && opts->new_branch)
+		die(_("'%s' cannot be used with '%s'"),
+		    "--detach", "-b/-B/--orphan");
+
+	if (opts->new_orphan_branch) {
+		if (opts->track != BRANCH_TRACK_UNSPECIFIED)
+			die(_("'%s' cannot be used with '%s'"), "--orphan", "-t");
+	} else if (opts->force_detach) {
+		if (opts->track != BRANCH_TRACK_UNSPECIFIED)
+			die(_("'%s' cannot be used with '%s'"), "--detach", "-t");
+	} else if (opts->track == BRANCH_TRACK_UNSPECIFIED)
+		opts->track = git_branch_track;
+
+	if (new->name && !new->commit)
+		die(_("Cannot switch branch to a non-commit '%s'"),
+		    new->name);
+
+	if (!new->commit && opts->new_branch) {
+		unsigned char rev[20];
+		int flag;
+
+		if (!read_ref_full("HEAD", rev, 0, &flag) &&
+		    (flag & REF_ISSYMREF) && is_null_sha1(rev))
+			return switch_unborn_to_new_branch(opts);
+	}
+	return switch_branches(opts, new);
+}
+
 int cmd_checkout(int argc, const char **argv, const char *prefix)
 {
 	struct checkout_opts opts;
-	unsigned char rev[20];
 	struct branch_info new;
-	struct tree *source_tree = NULL;
 	char *conflict_style = NULL;
-	int patch_mode = 0;
 	int dwim_new_local_branch = 1;
 	struct option options[] = {
-		OPT__QUIET(&opts.quiet, "suppress progress reporting"),
-		OPT_STRING('b', NULL, &opts.new_branch, "branch",
-			   "create and checkout a new branch"),
-		OPT_STRING('B', NULL, &opts.new_branch_force, "branch",
-			   "create/reset and checkout a branch"),
-		OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "create reflog for new branch"),
-		OPT_BOOLEAN(0, "detach", &opts.force_detach, "detach the HEAD at named commit"),
-		OPT_SET_INT('t', "track",  &opts.track, "set upstream info for new branch",
+		OPT__QUIET(&opts.quiet, N_("suppress progress reporting")),
+		OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
+			   N_("create and checkout a new branch")),
+		OPT_STRING('B', NULL, &opts.new_branch_force, N_("branch"),
+			   N_("create/reset and checkout a branch")),
+		OPT_BOOLEAN('l', NULL, &opts.new_branch_log, N_("create reflog for new branch")),
+		OPT_BOOLEAN(0, "detach", &opts.force_detach, N_("detach the HEAD at named commit")),
+		OPT_SET_INT('t', "track",  &opts.track, N_("set upstream info for new branch"),
 			BRANCH_TRACK_EXPLICIT),
-		OPT_STRING(0, "orphan", &opts.new_orphan_branch, "new branch", "new unparented branch"),
-		OPT_SET_INT('2', "ours", &opts.writeout_stage, "checkout our version for unmerged files",
+		OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new branch"), N_("new unparented branch")),
+		OPT_SET_INT('2', "ours", &opts.writeout_stage, N_("checkout our version for unmerged files"),
 			    2),
-		OPT_SET_INT('3', "theirs", &opts.writeout_stage, "checkout their version for unmerged files",
+		OPT_SET_INT('3', "theirs", &opts.writeout_stage, N_("checkout their version for unmerged files"),
 			    3),
-		OPT__FORCE(&opts.force, "force checkout (throw away local modifications)"),
-		OPT_BOOLEAN('m', "merge", &opts.merge, "perform a 3-way merge with the new branch"),
-		OPT_BOOLEAN(0, "overwrite-ignore", &opts.overwrite_ignore, "update ignored files (default)"),
-		OPT_STRING(0, "conflict", &conflict_style, "style",
-			   "conflict style (merge or diff3)"),
-		OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"),
+		OPT__FORCE(&opts.force, N_("force checkout (throw away local modifications)")),
+		OPT_BOOLEAN('m', "merge", &opts.merge, N_("perform a 3-way merge with the new branch")),
+		OPT_BOOLEAN(0, "overwrite-ignore", &opts.overwrite_ignore, N_("update ignored files (default)")),
+		OPT_STRING(0, "conflict", &conflict_style, N_("style"),
+			   N_("conflict style (merge or diff3)")),
+		OPT_BOOLEAN('p', "patch", &opts.patch_mode, N_("select hunks interactively")),
 		{ OPTION_BOOLEAN, 0, "guess", &dwim_new_local_branch, NULL,
-		  "second guess 'git checkout no-such-branch'",
+		  N_("second guess 'git checkout no-such-branch'"),
 		  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 		OPT_END(),
 	};
@@ -959,6 +1035,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 	memset(&opts, 0, sizeof(opts));
 	memset(&new, 0, sizeof(new));
 	opts.overwrite_ignore = 1;
+	opts.prefix = prefix;
 
 	gitmodules_config();
 	git_config(git_checkout_config, &opts);
@@ -968,26 +1045,27 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, options, checkout_usage,
 			     PARSE_OPT_KEEP_DASHDASH);
 
-	/* we can assume from now on new_branch = !new_branch_force */
-	if (opts.new_branch && opts.new_branch_force)
-		die(_("-B cannot be used with -b"));
+	if (conflict_style) {
+		opts.merge = 1; /* implied */
+		git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
+	}
+
+	if ((!!opts.new_branch + !!opts.new_branch_force + !!opts.new_orphan_branch) > 1)
+		die(_("-b, -B and --orphan are mutually exclusive"));
 
-	/* copy -B over to -b, so that we can just check the latter */
+	/*
+	 * From here on, new_branch will contain the branch to be checked out,
+	 * and new_branch_force and new_orphan_branch will tell us which one of
+	 * -b/-B/--orphan is being used.
+	 */
 	if (opts.new_branch_force)
 		opts.new_branch = opts.new_branch_force;
 
-	if (patch_mode && (opts.track > 0 || opts.new_branch
-			   || opts.new_branch_log || opts.merge || opts.force
-			   || opts.force_detach))
-		die (_("--patch is incompatible with all other options"));
-
-	if (opts.force_detach && (opts.new_branch || opts.new_orphan_branch))
-		die(_("--detach cannot be used with -b/-B/--orphan"));
-	if (opts.force_detach && 0 < opts.track)
-		die(_("--detach cannot be used with -t"));
+	if (opts.new_orphan_branch)
+		opts.new_branch = opts.new_orphan_branch;
 
-	/* --track without -b should DWIM */
-	if (0 < opts.track && !opts.new_branch) {
+	/* --track without -b/-B/--orphan should DWIM */
+	if (opts.track != BRANCH_TRACK_UNSPECIFIED && !opts.new_branch) {
 		const char *argv0 = argv[0];
 		if (!argc || !strcmp(argv0, "--"))
 			die (_("--track needs a branch name"));
@@ -1001,22 +1079,6 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 		opts.new_branch = argv0 + 1;
 	}
 
-	if (opts.new_orphan_branch) {
-		if (opts.new_branch)
-			die(_("--orphan and -b|-B are mutually exclusive"));
-		if (opts.track > 0)
-			die(_("--orphan cannot be used with -t"));
-		opts.new_branch = opts.new_orphan_branch;
-	}
-
-	if (conflict_style) {
-		opts.merge = 1; /* implied */
-		git_xmerge_config("merge.conflictstyle", conflict_style, NULL);
-	}
-
-	if (opts.force && opts.merge)
-		die(_("git checkout: -f and -m are incompatible"));
-
 	/*
 	 * Extract branch name from command line arguments, so
 	 * all that is left is pathspecs.
@@ -1031,73 +1093,56 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 	 * remote branches, erroring out for invalid or ambiguous cases.
 	 */
 	if (argc) {
+		unsigned char rev[20];
 		int dwim_ok =
-			!patch_mode &&
+			!opts.patch_mode &&
 			dwim_new_local_branch &&
 			opts.track == BRANCH_TRACK_UNSPECIFIED &&
 			!opts.new_branch;
 		int n = parse_branchname_arg(argc, argv, dwim_ok,
-				&new, &source_tree, rev, &opts.new_branch);
+					     &new, &opts.source_tree,
+					     rev, &opts.new_branch);
 		argv += n;
 		argc -= n;
 	}
 
-	if (opts.track == BRANCH_TRACK_UNSPECIFIED)
-		opts.track = git_branch_track;
-
 	if (argc) {
-		const char **pathspec = get_pathspec(prefix, argv);
+		opts.pathspec = get_pathspec(prefix, argv);
 
-		if (!pathspec)
+		if (!opts.pathspec)
 			die(_("invalid path specification"));
 
-		if (patch_mode)
-			return interactive_checkout(new.name, pathspec, &opts);
-
-		/* Checkout paths */
-		if (opts.new_branch) {
-			if (argc == 1) {
-				die(_("git checkout: updating paths is incompatible with switching branches.\nDid you intend to checkout '%s' which can not be resolved as commit?"), argv[0]);
-			} else {
-				die(_("git checkout: updating paths is incompatible with switching branches."));
-			}
-		}
+		/*
+		 * Try to give more helpful suggestion.
+		 * new_branch && argc > 1 will be caught later.
+		 */
+		if (opts.new_branch && argc == 1)
+			die(_("Cannot update paths and switch to branch '%s' at the same time.\n"
+			      "Did you intend to checkout '%s' which can not be resolved as commit?"),
+			    opts.new_branch, argv[0]);
 
 		if (opts.force_detach)
-			die(_("git checkout: --detach does not take a path argument"));
+			die(_("git checkout: --detach does not take a path argument '%s'"),
+			    argv[0]);
 
 		if (1 < !!opts.writeout_stage + !!opts.force + !!opts.merge)
-			die(_("git checkout: --ours/--theirs, --force and --merge are incompatible when\nchecking out of the index."));
-
-		return checkout_paths(source_tree, pathspec, prefix, &opts);
+			die(_("git checkout: --ours/--theirs, --force and --merge are incompatible when\n"
+			      "checking out of the index."));
 	}
 
-	if (patch_mode)
-		return interactive_checkout(new.name, NULL, &opts);
-
 	if (opts.new_branch) {
 		struct strbuf buf = STRBUF_INIT;
 
-		opts.branch_exists = validate_new_branchname(opts.new_branch, &buf,
-							     !!opts.new_branch_force,
-							     !!opts.new_branch_force);
+		opts.branch_exists =
+			validate_new_branchname(opts.new_branch, &buf,
+						!!opts.new_branch_force,
+						!!opts.new_branch_force);
 
 		strbuf_release(&buf);
 	}
 
-	if (new.name && !new.commit) {
-		die(_("Cannot switch branch to a non-commit."));
-	}
-	if (opts.writeout_stage)
-		die(_("--ours/--theirs is incompatible with switching branches."));
-
-	if (!new.commit && opts.new_branch) {
-		unsigned char rev[20];
-		int flag;
-
-		if (!read_ref_full("HEAD", rev, 0, &flag) &&
-		    (flag & REF_ISSYMREF) && is_null_sha1(rev))
-			return switch_unborn_to_new_branch(&opts);
-	}
-	return switch_branches(&opts, &new);
+	if (opts.patch_mode || opts.pathspec)
+		return checkout_paths(&opts, new.name);
+	else
+		return checkout_branch(&opts, &new);
 }
diff --git a/builtin/clean.c b/builtin/clean.c
index 0c7b3d0f..69c1cda9 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -16,7 +16,7 @@
 static int force = -1; /* unset */
 
 static const char *const builtin_clean_usage[] = {
-	"git clean [-d] [-f] [-n] [-q] [-e <pattern>] [-x | -X] [--] <paths>...",
+	N_("git clean [-d] [-f] [-n] [-q] [-e <pattern>] [-x | -X] [--] <paths>..."),
 	NULL
 };
 
@@ -48,16 +48,16 @@ int cmd_clean(int argc, const char **argv, const char *prefix)
 	const char *qname;
 	char *seen = NULL;
 	struct option options[] = {
-		OPT__QUIET(&quiet, "do not print names of files removed"),
-		OPT__DRY_RUN(&show_only, "dry run"),
-		OPT__FORCE(&force, "force"),
+		OPT__QUIET(&quiet, N_("do not print names of files removed")),
+		OPT__DRY_RUN(&show_only, N_("dry run")),
+		OPT__FORCE(&force, N_("force")),
 		OPT_BOOLEAN('d', NULL, &remove_directories,
-				"remove whole directories"),
-		{ OPTION_CALLBACK, 'e', "exclude", &exclude_list, "pattern",
-		  "add <pattern> to ignore rules", PARSE_OPT_NONEG, exclude_cb },
-		OPT_BOOLEAN('x', NULL, &ignored, "remove ignored files, too"),
+				N_("remove whole directories")),
+		{ OPTION_CALLBACK, 'e', "exclude", &exclude_list, N_("pattern"),
+		  N_("add <pattern> to ignore rules"), PARSE_OPT_NONEG, exclude_cb },
+		OPT_BOOLEAN('x', NULL, &ignored, N_("remove ignored files, too")),
 		OPT_BOOLEAN('X', NULL, &ignored_only,
-				"remove only ignored files"),
+				N_("remove only ignored files")),
 		OPT_END()
 	};
 
diff --git a/builtin/clone.c b/builtin/clone.c
index a4d8d25e..ec2f75b4 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -33,12 +33,12 @@
  *
  */
 static const char * const builtin_clone_usage[] = {
-	"git clone [options] [--] <repo> [<dir>]",
+	N_("git clone [options] [--] <repo> [<dir>]"),
 	NULL
 };
 
 static int option_no_checkout, option_bare, option_mirror, option_single_branch = -1;
-static int option_local, option_no_hardlinks, option_shared, option_recursive;
+static int option_local = -1, option_no_hardlinks, option_shared, option_recursive;
 static char *option_template, *option_depth;
 static char *option_origin = NULL;
 static char *option_branch = NULL;
@@ -61,43 +61,43 @@ static int opt_parse_reference(const struct option *opt, const char *arg, int un
 static struct option builtin_clone_options[] = {
 	OPT__VERBOSITY(&option_verbosity),
 	OPT_BOOL(0, "progress", &option_progress,
-		 "force progress reporting"),
+		 N_("force progress reporting")),
 	OPT_BOOLEAN('n', "no-checkout", &option_no_checkout,
-		    "don't create a checkout"),
-	OPT_BOOLEAN(0, "bare", &option_bare, "create a bare repository"),
+		    N_("don't create a checkout")),
+	OPT_BOOLEAN(0, "bare", &option_bare, N_("create a bare repository")),
 	{ OPTION_BOOLEAN, 0, "naked", &option_bare, NULL,
-		"create a bare repository",
+		N_("create a bare repository"),
 		PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 	OPT_BOOLEAN(0, "mirror", &option_mirror,
-		    "create a mirror repository (implies bare)"),
-	OPT_BOOLEAN('l', "local", &option_local,
-		    "to clone from a local repository"),
+		    N_("create a mirror repository (implies bare)")),
+	OPT_BOOL('l', "local", &option_local,
+		N_("to clone from a local repository")),
 	OPT_BOOLEAN(0, "no-hardlinks", &option_no_hardlinks,
-		    "don't use local hardlinks, always copy"),
+		    N_("don't use local hardlinks, always copy")),
 	OPT_BOOLEAN('s', "shared", &option_shared,
-		    "setup as shared repository"),
+		    N_("setup as shared repository")),
 	OPT_BOOLEAN(0, "recursive", &option_recursive,
-		    "initialize submodules in the clone"),
+		    N_("initialize submodules in the clone")),
 	OPT_BOOLEAN(0, "recurse-submodules", &option_recursive,
-		    "initialize submodules in the clone"),
-	OPT_STRING(0, "template", &option_template, "template-directory",
-		   "directory from which templates will be used"),
-	OPT_CALLBACK(0 , "reference", &option_reference, "repo",
-		     "reference repository", &opt_parse_reference),
-	OPT_STRING('o', "origin", &option_origin, "name",
-		   "use <name> instead of 'origin' to track upstream"),
-	OPT_STRING('b', "branch", &option_branch, "branch",
-		   "checkout <branch> instead of the remote's HEAD"),
-	OPT_STRING('u', "upload-pack", &option_upload_pack, "path",
-		   "path to git-upload-pack on the remote"),
-	OPT_STRING(0, "depth", &option_depth, "depth",
-		    "create a shallow clone of that depth"),
+		    N_("initialize submodules in the clone")),
+	OPT_STRING(0, "template", &option_template, N_("template-directory"),
+		   N_("directory from which templates will be used")),
+	OPT_CALLBACK(0 , "reference", &option_reference, N_("repo"),
+		     N_("reference repository"), &opt_parse_reference),
+	OPT_STRING('o', "origin", &option_origin, N_("name"),
+		   N_("use <name> instead of 'origin' to track upstream")),
+	OPT_STRING('b', "branch", &option_branch, N_("branch"),
+		   N_("checkout <branch> instead of the remote's HEAD")),
+	OPT_STRING('u', "upload-pack", &option_upload_pack, N_("path"),
+		   N_("path to git-upload-pack on the remote")),
+	OPT_STRING(0, "depth", &option_depth, N_("depth"),
+		    N_("create a shallow clone of that depth")),
 	OPT_BOOL(0, "single-branch", &option_single_branch,
-		    "clone only one branch, HEAD or --branch"),
-	OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
-		   "separate git dir from working tree"),
-	OPT_STRING_LIST('c', "config", &option_config, "key=value",
-			"set config inside the new repository"),
+		    N_("clone only one branch, HEAD or --branch")),
+	OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
+		   N_("separate git dir from working tree")),
+	OPT_STRING_LIST('c', "config", &option_config, N_("key=value"),
+			N_("set config inside the new repository")),
 	OPT_END()
 };
 
@@ -236,7 +236,7 @@ static int add_one_reference(struct string_list_item *item, void *cb_data)
 	/* Beware: real_path() and mkpath() return static buffer */
 	ref_git = xstrdup(real_path(item->string));
 	if (is_directory(mkpath("%s/.git/objects", ref_git))) {
-		char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
+		char *ref_git_git = mkpathdup("%s/.git", ref_git);
 		free(ref_git);
 		ref_git = ref_git_git;
 	} else if (!is_directory(mkpath("%s/objects", ref_git)))
@@ -342,7 +342,7 @@ static void copy_or_link_directory(struct strbuf *src, struct strbuf *dest,
 		if (!option_no_hardlinks) {
 			if (!link(src->buf, dest->buf))
 				continue;
-			if (option_local)
+			if (option_local > 0)
 				die_errno(_("failed to create link '%s'"), dest->buf);
 			option_no_hardlinks = 1;
 		}
@@ -433,8 +433,11 @@ static struct ref *wanted_peer_refs(const struct ref *refs,
 
 		if (!option_branch)
 			remote_head = guess_remote_head(head, refs, 0);
-		else
-			remote_head = find_remote_branch(refs, option_branch);
+		else {
+			local_refs = NULL;
+			tail = &local_refs;
+			remote_head = copy_ref(find_remote_branch(refs, option_branch));
+		}
 
 		if (!remote_head && option_branch)
 			warning(_("Could not find remote branch %s to clone."),
@@ -607,6 +610,54 @@ static void write_config(struct string_list *config)
 	}
 }
 
+static void write_refspec_config(const char* src_ref_prefix,
+		const struct ref* our_head_points_at,
+		const struct ref* remote_head_points_at, struct strbuf* branch_top)
+{
+	struct strbuf key = STRBUF_INIT;
+	struct strbuf value = STRBUF_INIT;
+
+	if (option_mirror || !option_bare) {
+		if (option_single_branch && !option_mirror) {
+			if (option_branch) {
+				if (strstr(our_head_points_at->name, "refs/tags/"))
+					strbuf_addf(&value, "+%s:%s", our_head_points_at->name,
+						our_head_points_at->name);
+				else
+					strbuf_addf(&value, "+%s:%s%s", our_head_points_at->name,
+						branch_top->buf, option_branch);
+			} else if (remote_head_points_at) {
+				strbuf_addf(&value, "+%s:%s%s", remote_head_points_at->name,
+						branch_top->buf,
+						skip_prefix(remote_head_points_at->name, "refs/heads/"));
+			}
+			/*
+			 * otherwise, the next "git fetch" will
+			 * simply fetch from HEAD without updating
+			 * any remote tracking branch, which is what
+			 * we want.
+			 */
+		} else {
+			strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top->buf);
+		}
+		/* Configure the remote */
+		if (value.len) {
+			strbuf_addf(&key, "remote.%s.fetch", option_origin);
+			git_config_set_multivar(key.buf, value.buf, "^$", 0);
+			strbuf_reset(&key);
+
+			if (option_mirror) {
+				strbuf_addf(&key, "remote.%s.mirror", option_origin);
+				git_config_set(key.buf, "true");
+				strbuf_reset(&key);
+			}
+		}
+	}
+
+	strbuf_release(&key);
+	strbuf_release(&value);
+}
+
 int cmd_clone(int argc, const char **argv, const char *prefix)
 {
 	int is_bundle = 0, is_local;
@@ -668,7 +719,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		die(_("repository '%s' does not exist"), repo_name);
 	else
 		repo = repo_name;
-	is_local = path && !is_bundle;
+	is_local = option_local != 0 && path && !is_bundle;
 	if (is_local && option_depth)
 		warning(_("--depth is ignored in local clones; use file:// instead."));
 
@@ -697,7 +748,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		git_dir = xstrdup(dir);
 	else {
 		work_tree = dir;
-		git_dir = xstrdup(mkpath("%s/.git", dir));
+		git_dir = mkpathdup("%s/.git", dir);
 	}
 
 	if (!option_bare) {
@@ -705,7 +756,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 		if (safe_create_leading_directories_const(work_tree) < 0)
 			die_errno(_("could not create leading directories of '%s'"),
 				  work_tree);
-		if (!dest_exists && mkdir(work_tree, 0755))
+		if (!dest_exists && mkdir(work_tree, 0777))
 			die_errno(_("could not create work tree dir '%s'."),
 				  work_tree);
 		set_git_work_tree(work_tree);
@@ -752,20 +803,6 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	}
 
 	strbuf_addf(&value, "+%s*:%s*", src_ref_prefix, branch_top.buf);
-
-	if (option_mirror || !option_bare) {
-		/* Configure the remote */
-		strbuf_addf(&key, "remote.%s.fetch", option_origin);
-		git_config_set_multivar(key.buf, value.buf, "^$", 0);
-		strbuf_reset(&key);
-
-		if (option_mirror) {
-			strbuf_addf(&key, "remote.%s.mirror", option_origin);
-			git_config_set(key.buf, "true");
-			strbuf_reset(&key);
-		}
-	}
-
 	strbuf_addf(&key, "remote.%s.url", option_origin);
 	git_config_set(key.buf, repo);
 	strbuf_reset(&key);
@@ -850,6 +887,9 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 					      "refs/heads/master");
 	}
 
+	write_refspec_config(src_ref_prefix, our_head_points_at,
+			remote_head_points_at, &branch_top);
+
 	if (is_local)
 		clone_local(path, git_dir);
 	else if (refs && complete_refs_before_fetch)
diff --git a/builtin/column.c b/builtin/column.c
new file mode 100644
index 00000000..e125a55f
--- /dev/null
+++ b/builtin/column.c
@@ -0,0 +1,59 @@
+#include "builtin.h"
+#include "cache.h"
+#include "strbuf.h"
+#include "parse-options.h"
+#include "string-list.h"
+#include "column.h"
+
+static const char * const builtin_column_usage[] = {
+	N_("git column [options]"),
+	NULL
+};
+static unsigned int colopts;
+
+static int column_config(const char *var, const char *value, void *cb)
+{
+	return git_column_config(var, value, cb, &colopts);
+}
+
+int cmd_column(int argc, const char **argv, const char *prefix)
+{
+	struct string_list list = STRING_LIST_INIT_DUP;
+	struct strbuf sb = STRBUF_INIT;
+	struct column_options copts;
+	const char *command = NULL, *real_command = NULL;
+	struct option options[] = {
+		OPT_STRING(0, "command", &real_command, N_("name"), N_("lookup config vars")),
+		OPT_COLUMN(0, "mode", &colopts, N_("layout to use")),
+		OPT_INTEGER(0, "raw-mode", &colopts, N_("layout to use")),
+		OPT_INTEGER(0, "width", &copts.width, N_("Maximum width")),
+		OPT_STRING(0, "indent", &copts.indent, N_("string"), N_("Padding space on left border")),
+		OPT_INTEGER(0, "nl", &copts.nl, N_("Padding space on right border")),
+		OPT_INTEGER(0, "padding", &copts.padding, N_("Padding space between columns")),
+		OPT_END()
+	};
+
+	/* This one is special and must be the first one */
+	if (argc > 1 && !prefixcmp(argv[1], "--command=")) {
+		command = argv[1] + 10;
+		git_config(column_config, (void *)command);
+	} else
+		git_config(column_config, NULL);
+
+	memset(&copts, 0, sizeof(copts));
+	copts.width = term_columns();
+	copts.padding = 1;
+	argc = parse_options(argc, argv, "", options, builtin_column_usage, 0);
+	if (argc)
+		usage_with_options(builtin_column_usage, options);
+	if (real_command || command) {
+		if (!real_command || !command || strcmp(real_command, command))
+			die(_("--command must be the first argument"));
+	}
+	finalize_colopts(&colopts, -1);
+	while (!strbuf_getline(&sb, stdin, '\n'))
+		string_list_append(&list, sb.buf);
+
+	print_columns(&list, colopts, &copts);
+	return 0;
+}
diff --git a/builtin/commit-tree.c b/builtin/commit-tree.c
index 164b655d..eac901a0 100644
--- a/builtin/commit-tree.c
+++ b/builtin/commit-tree.c
@@ -48,16 +48,13 @@ int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 	if (argc < 2 || !strcmp(argv[1], "-h"))
 		usage(commit_tree_usage);
 
-	if (get_sha1(argv[1], tree_sha1))
-		die("Not a valid object name %s", argv[1]);
-
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
 		if (!strcmp(arg, "-p")) {
 			unsigned char sha1[20];
 			if (argc <= ++i)
 				usage(commit_tree_usage);
-			if (get_sha1(argv[i], sha1))
+			if (get_sha1_commit(argv[i], sha1))
 				die("Not a valid object name %s", argv[i]);
 			assert_sha1_type(sha1, OBJ_COMMIT);
 			new_parent(lookup_commit(sha1), &parents);
@@ -104,7 +101,7 @@ int cmd_commit_tree(int argc, const char **argv, const char *prefix)
 			continue;
 		}
 
-		if (get_sha1(arg, tree_sha1))
+		if (get_sha1_tree(arg, tree_sha1))
 			die("Not a valid object name %s", arg);
 		if (got_tree)
 			die("Cannot give more than one trees");
diff --git a/builtin/commit.c b/builtin/commit.c
index e2d9cbe3..a17a5df4 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -27,14 +27,16 @@
 #include "quote.h"
 #include "submodule.h"
 #include "gpg-interface.h"
+#include "column.h"
+#include "sequencer.h"
 
 static const char * const builtin_commit_usage[] = {
-	"git commit [options] [--] <filepattern>...",
+	N_("git commit [options] [--] <filepattern>..."),
 	NULL
 };
 
 static const char * const builtin_status_usage[] = {
-	"git status [options] [--] <filepattern>...",
+	N_("git status [options] [--] <filepattern>..."),
 	NULL
 };
 
@@ -139,24 +141,6 @@ static void determine_whence(struct wt_status *s)
 		s->whence = whence;
 }
 
-static const char *whence_s(void)
-{
-	const char *s = "";
-
-	switch (whence) {
-	case FROM_COMMIT:
-		break;
-	case FROM_MERGE:
-		s = _("merge");
-		break;
-	case FROM_CHERRY_PICK:
-		s = _("cherry-pick");
-		break;
-	}
-
-	return s;
-}
-
 static void rollback_index_files(void)
 {
 	switch (commit_style) {
@@ -201,6 +185,9 @@ static int list_paths(struct string_list *list, const char *with_tree,
 	int i;
 	char *m;
 
+	if (!pattern)
+		return 0;
+
 	for (i = 0; pattern[i]; i++)
 		;
 	m = xcalloc(1, i);
@@ -362,7 +349,7 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	 * and create commit from the_index.
 	 * We still need to refresh the index here.
 	 */
-	if (!pathspec || !*pathspec) {
+	if (!only && (!pathspec || !*pathspec)) {
 		fd = hold_locked_index(&index_lock, 1);
 		refresh_cache_or_die(refresh_flags);
 		if (active_cache_changed) {
@@ -398,8 +385,12 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	 */
 	commit_style = COMMIT_PARTIAL;
 
-	if (whence != FROM_COMMIT)
-		die(_("cannot do a partial commit during a %s."), whence_s());
+	if (whence != FROM_COMMIT) {
+		if (whence == FROM_MERGE)
+			die(_("cannot do a partial commit during a merge."));
+		else if (whence == FROM_CHERRY_PICK)
+			die(_("cannot do a partial commit during a cherry-pick."));
+	}
 
 	memset(&partial, 0, sizeof(partial));
 	partial.strdup_strings = 1;
@@ -476,8 +467,6 @@ static int is_a_merge(const struct commit *current_head)
 	return !!(current_head->parents && current_head->parents->next);
 }
 
-static const char sign_off_header[] = "Signed-off-by: ";
-
 static void export_one(const char *var, const char *s, const char *e, int hack)
 {
 	struct strbuf buf = STRBUF_INIT;
@@ -488,6 +477,20 @@ static void export_one(const char *var, const char *s, const char *e, int hack)
 	strbuf_release(&buf);
 }
 
+static int sane_ident_split(struct ident_split *person)
+{
+	if (!person->name_begin || !person->name_end ||
+	    person->name_begin == person->name_end)
+		return 0; /* no human readable name */
+	if (!person->mail_begin || !person->mail_end ||
+	    person->mail_begin == person->mail_end)
+		return 0; /* no usable mail */
+	if (!person->date_begin || !person->date_end ||
+	    !person->tz_begin || !person->tz_end)
+		return 0;
+	return 1;
+}
+
 static void determine_author_info(struct strbuf *author_ident)
 {
 	char *name, *email, *date;
@@ -539,56 +542,15 @@ static void determine_author_info(struct strbuf *author_ident)
 
 	if (force_date)
 		date = force_date;
-	strbuf_addstr(author_ident, fmt_ident(name, email, date,
-					      IDENT_ERROR_ON_NO_NAME));
-	if (!split_ident_line(&author, author_ident->buf, author_ident->len)) {
+	strbuf_addstr(author_ident, fmt_ident(name, email, date, IDENT_STRICT));
+	if (!split_ident_line(&author, author_ident->buf, author_ident->len) &&
+	    sane_ident_split(&author)) {
 		export_one("GIT_AUTHOR_NAME", author.name_begin, author.name_end, 0);
 		export_one("GIT_AUTHOR_EMAIL", author.mail_begin, author.mail_end, 0);
 		export_one("GIT_AUTHOR_DATE", author.date_begin, author.tz_end, '@');
 	}
 }
 
-static int ends_rfc2822_footer(struct strbuf *sb)
-{
-	int ch;
-	int hit = 0;
-	int i, j, k;
-	int len = sb->len;
-	int first = 1;
-	const char *buf = sb->buf;
-
-	for (i = len - 1; i > 0; i--) {
-		if (hit && buf[i] == '\n')
-			break;
-		hit = (buf[i] == '\n');
-	}
-
-	while (i < len - 1 && buf[i] == '\n')
-		i++;
-
-	for (; i < len; i = k) {
-		for (k = i; k < len && buf[k] != '\n'; k++)
-			; /* do nothing */
-		k++;
-
-		if ((buf[k] == ' ' || buf[k] == '\t') && !first)
-			continue;
-
-		first = 0;
-
-		for (j = 0; i + j < len; j++) {
-			ch = buf[i + j];
-			if (ch == ':')
-				break;
-			if (isalnum(ch) ||
-			    (ch == '-'))
-				continue;
-			return 0;
-		}
-	}
-	return 1;
-}
-
 static char *cut_ident_timestamp_part(char *string)
 {
 	char *ket = strrchr(string, '>');
@@ -654,7 +616,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 		hook_arg1 = "message";
 	} else if (use_message) {
 		buffer = strstr(use_message_buffer, "\n\n");
-		if (!buffer || buffer[2] == '\0')
+		if (!use_editor && (!buffer || buffer[2] == '\0'))
 			die(_("commit has empty message"));
 		strbuf_add(&sb, buffer + 2, strlen(buffer + 2));
 		hook_arg1 = "commit";
@@ -713,21 +675,30 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 		stripspace(&sb, 0);
 
 	if (signoff) {
-		struct strbuf sob = STRBUF_INIT;
-		int i;
-
-		strbuf_addstr(&sob, sign_off_header);
-		strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
-					     getenv("GIT_COMMITTER_EMAIL")));
-		strbuf_addch(&sob, '\n');
-		for (i = sb.len - 1; i > 0 && sb.buf[i - 1] != '\n'; i--)
-			; /* do nothing */
-		if (prefixcmp(sb.buf + i, sob.buf)) {
-			if (!i || !ends_rfc2822_footer(&sb))
-				strbuf_addch(&sb, '\n');
-			strbuf_addbuf(&sb, &sob);
+		/*
+		 * See if we have a Conflicts: block at the end. If yes, count
+		 * its size, so we can ignore it.
+		 */
+		int ignore_footer = 0;
+		int i, eol, previous = 0;
+		const char *nl;
+
+		for (i = 0; i < sb.len; i++) {
+			nl = memchr(sb.buf + i, '\n', sb.len - i);
+			if (nl)
+				eol = nl - sb.buf;
+			else
+				eol = sb.len;
+			if (!prefixcmp(sb.buf + previous, "\nConflicts:\n")) {
+				ignore_footer = sb.len - previous;
+				break;
+			}
+			while (i < eol)
+				i++;
+			previous = eol;
 		}
-		strbuf_release(&sob);
+
+		append_signoff(&sb, ignore_footer);
 	}
 
 	if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
@@ -736,33 +707,36 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	strbuf_release(&sb);
 
 	/* This checks if committer ident is explicitly given */
-	strbuf_addstr(&committer_ident, git_committer_info(0));
+	strbuf_addstr(&committer_ident, git_committer_info(IDENT_STRICT));
 	if (use_editor && include_status) {
 		char *ai_tmp, *ci_tmp;
 		if (whence != FROM_COMMIT)
 			status_printf_ln(s, GIT_COLOR_NORMAL,
-				_("\n"
-				"It looks like you may be committing a %s.\n"
-				"If this is not correct, please remove the file\n"
-				"	%s\n"
-				"and try again.\n"
-				""),
-				whence_s(),
+			    whence == FROM_MERGE
+				? _("\n"
+					"It looks like you may be committing a merge.\n"
+					"If this is not correct, please remove the file\n"
+					"	%s\n"
+					"and try again.\n")
+				: _("\n"
+					"It looks like you may be committing a cherry-pick.\n"
+					"If this is not correct, please remove the file\n"
+					"	%s\n"
+					"and try again.\n"),
 				git_path(whence == FROM_MERGE
 					 ? "MERGE_HEAD"
 					 : "CHERRY_PICK_HEAD"));
 
 		fprintf(s->fp, "\n");
-		status_printf(s, GIT_COLOR_NORMAL,
-			_("Please enter the commit message for your changes."));
 		if (cleanup_mode == CLEANUP_ALL)
-			status_printf_more(s, GIT_COLOR_NORMAL,
-				_(" Lines starting\n"
-				"with '#' will be ignored, and an empty"
+			status_printf(s, GIT_COLOR_NORMAL,
+				_("Please enter the commit message for your changes."
+				" Lines starting\nwith '#' will be ignored, and an empty"
 				" message aborts the commit.\n"));
 		else /* CLEANUP_SPACE, that is. */
-			status_printf_more(s, GIT_COLOR_NORMAL,
-				_(" Lines starting\n"
+			status_printf(s, GIT_COLOR_NORMAL,
+				_("Please enter the commit message for your changes."
+				" Lines starting\n"
 				"with '#' will be kept; you may remove them"
 				" yourself if you want to.\n"
 				"An empty message aborts the commit.\n"));
@@ -1017,8 +991,12 @@ static int parse_and_validate_options(int argc, const char *argv[],
 	/* Sanity check options */
 	if (amend && !current_head)
 		die(_("You have nothing to amend."));
-	if (amend && whence != FROM_COMMIT)
-		die(_("You are in the middle of a %s -- cannot amend."), whence_s());
+	if (amend && whence != FROM_COMMIT) {
+		if (whence == FROM_MERGE)
+			die(_("You are in the middle of a merge -- cannot amend."));
+		else if (whence == FROM_CHERRY_PICK)
+			die(_("You are in the middle of a cherry-pick -- cannot amend."));
+	}
 	if (fixup_message && squash_message)
 		die(_("Options --squash and --fixup cannot be used together"));
 	if (use_message)
@@ -1125,6 +1103,8 @@ static int git_status_config(const char *k, const char *v, void *cb)
 {
 	struct wt_status *s = cb;
 
+	if (!prefixcmp(k, "column."))
+		return git_column_config(k, v, "status", &s->colopts);
 	if (!strcmp(k, "status.submodulesummary")) {
 		int is_bool;
 		s->submodule_summary = git_config_bool_or_int(k, v, &is_bool);
@@ -1171,25 +1151,26 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 	int fd;
 	unsigned char sha1[20];
 	static struct option builtin_status_options[] = {
-		OPT__VERBOSE(&verbose, "be verbose"),
+		OPT__VERBOSE(&verbose, N_("be verbose")),
 		OPT_SET_INT('s', "short", &status_format,
-			    "show status concisely", STATUS_FORMAT_SHORT),
+			    N_("show status concisely"), STATUS_FORMAT_SHORT),
 		OPT_BOOLEAN('b', "branch", &s.show_branch,
-			    "show branch information"),
+			    N_("show branch information")),
 		OPT_SET_INT(0, "porcelain", &status_format,
-			    "machine-readable output",
+			    N_("machine-readable output"),
 			    STATUS_FORMAT_PORCELAIN),
 		OPT_BOOLEAN('z', "null", &s.null_termination,
-			    "terminate entries with NUL"),
+			    N_("terminate entries with NUL")),
 		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg,
-		  "mode",
-		  "show untracked files, optional modes: all, normal, no. (Default: all)",
+		  N_("mode"),
+		  N_("show untracked files, optional modes: all, normal, no. (Default: all)"),
 		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 		OPT_BOOLEAN(0, "ignored", &show_ignored_in_status,
-			    "show ignored files"),
-		{ OPTION_STRING, 0, "ignore-submodules", &ignore_submodule_arg, "when",
-		  "ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)",
+			    N_("show ignored files")),
+		{ OPTION_STRING, 0, "ignore-submodules", &ignore_submodule_arg, N_("when"),
+		  N_("ignore changes to submodules, optional when: all, dirty, untracked. (Default: all)"),
 		  PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
+		OPT_COLUMN(0, "column", &s.colopts, N_("list untracked files in columns")),
 		OPT_END(),
 	};
 
@@ -1203,6 +1184,7 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix,
 			     builtin_status_options,
 			     builtin_status_usage, 0);
+	finalize_colopts(&s.colopts, -1);
 
 	if (s.null_termination && status_format == STATUS_FORMAT_LONG)
 		status_format = STATUS_FORMAT_PORCELAIN;
@@ -1369,53 +1351,53 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 {
 	static struct wt_status s;
 	static struct option builtin_commit_options[] = {
-		OPT__QUIET(&quiet, "suppress summary after successful commit"),
-		OPT__VERBOSE(&verbose, "show diff in commit message template"),
-
-		OPT_GROUP("Commit message options"),
-		OPT_FILENAME('F', "file", &logfile, "read message from file"),
-		OPT_STRING(0, "author", &force_author, "author", "override author for commit"),
-		OPT_STRING(0, "date", &force_date, "date", "override date for commit"),
-		OPT_CALLBACK('m', "message", &message, "message", "commit message", opt_parse_m),
-		OPT_STRING('c', "reedit-message", &edit_message, "commit", "reuse and edit message from specified commit"),
-		OPT_STRING('C', "reuse-message", &use_message, "commit", "reuse message from specified commit"),
-		OPT_STRING(0, "fixup", &fixup_message, "commit", "use autosquash formatted message to fixup specified commit"),
-		OPT_STRING(0, "squash", &squash_message, "commit", "use autosquash formatted message to squash specified commit"),
-		OPT_BOOLEAN(0, "reset-author", &renew_authorship, "the commit is authored by me now (used with -C/-c/--amend)"),
-		OPT_BOOLEAN('s', "signoff", &signoff, "add Signed-off-by:"),
-		OPT_FILENAME('t', "template", &template_file, "use specified template file"),
-		OPT_BOOL('e', "edit", &edit_flag, "force edit of commit"),
-		OPT_STRING(0, "cleanup", &cleanup_arg, "default", "how to strip spaces and #comments from message"),
-		OPT_BOOLEAN(0, "status", &include_status, "include status in commit message template"),
-		{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, "key id",
-		  "GPG sign commit", PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+		OPT__QUIET(&quiet, N_("suppress summary after successful commit")),
+		OPT__VERBOSE(&verbose, N_("show diff in commit message template")),
+
+		OPT_GROUP(N_("Commit message options")),
+		OPT_FILENAME('F', "file", &logfile, N_("read message from file")),
+		OPT_STRING(0, "author", &force_author, N_("author"), N_("override author for commit")),
+		OPT_STRING(0, "date", &force_date, N_("date"), N_("override date for commit")),
+		OPT_CALLBACK('m', "message", &message, N_("message"), N_("commit message"), opt_parse_m),
+		OPT_STRING('c', "reedit-message", &edit_message, N_("commit"), N_("reuse and edit message from specified commit")),
+		OPT_STRING('C', "reuse-message", &use_message, N_("commit"), N_("reuse message from specified commit")),
+		OPT_STRING(0, "fixup", &fixup_message, N_("commit"), N_("use autosquash formatted message to fixup specified commit")),
+		OPT_STRING(0, "squash", &squash_message, N_("commit"), N_("use autosquash formatted message to squash specified commit")),
+		OPT_BOOLEAN(0, "reset-author", &renew_authorship, N_("the commit is authored by me now (used with -C/-c/--amend)")),
+		OPT_BOOLEAN('s', "signoff", &signoff, N_("add Signed-off-by:")),
+		OPT_FILENAME('t', "template", &template_file, N_("use specified template file")),
+		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of commit")),
+		OPT_STRING(0, "cleanup", &cleanup_arg, N_("default"), N_("how to strip spaces and #comments from message")),
+		OPT_BOOLEAN(0, "status", &include_status, N_("include status in commit message template")),
+		{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key id"),
+		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 		/* end commit message options */
 
-		OPT_GROUP("Commit contents options"),
-		OPT_BOOLEAN('a', "all", &all, "commit all changed files"),
-		OPT_BOOLEAN('i', "include", &also, "add specified files to index for commit"),
-		OPT_BOOLEAN(0, "interactive", &interactive, "interactively add files"),
-		OPT_BOOLEAN('p', "patch", &patch_interactive, "interactively add changes"),
-		OPT_BOOLEAN('o', "only", &only, "commit only specified files"),
-		OPT_BOOLEAN('n', "no-verify", &no_verify, "bypass pre-commit hook"),
-		OPT_BOOLEAN(0, "dry-run", &dry_run, "show what would be committed"),
-		OPT_SET_INT(0, "short", &status_format, "show status concisely",
+		OPT_GROUP(N_("Commit contents options")),
+		OPT_BOOLEAN('a', "all", &all, N_("commit all changed files")),
+		OPT_BOOLEAN('i', "include", &also, N_("add specified files to index for commit")),
+		OPT_BOOLEAN(0, "interactive", &interactive, N_("interactively add files")),
+		OPT_BOOLEAN('p', "patch", &patch_interactive, N_("interactively add changes")),
+		OPT_BOOLEAN('o', "only", &only, N_("commit only specified files")),
+		OPT_BOOLEAN('n', "no-verify", &no_verify, N_("bypass pre-commit hook")),
+		OPT_BOOLEAN(0, "dry-run", &dry_run, N_("show what would be committed")),
+		OPT_SET_INT(0, "short", &status_format, N_("show status concisely"),
 			    STATUS_FORMAT_SHORT),
-		OPT_BOOLEAN(0, "branch", &s.show_branch, "show branch information"),
+		OPT_BOOLEAN(0, "branch", &s.show_branch, N_("show branch information")),
 		OPT_SET_INT(0, "porcelain", &status_format,
-			    "machine-readable output", STATUS_FORMAT_PORCELAIN),
+			    N_("machine-readable output"), STATUS_FORMAT_PORCELAIN),
 		OPT_BOOLEAN('z', "null", &s.null_termination,
-			    "terminate entries with NUL"),
-		OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
-		OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
-		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
+			    N_("terminate entries with NUL")),
+		OPT_BOOLEAN(0, "amend", &amend, N_("amend previous commit")),
+		OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, N_("bypass post-rewrite hook")),
+		{ OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, N_("mode"), N_("show untracked files, optional modes: all, normal, no. (Default: all)"), PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
 		/* end commit contents options */
 
 		{ OPTION_BOOLEAN, 0, "allow-empty", &allow_empty, NULL,
-		  "ok to record an empty change",
+		  N_("ok to record an empty change"),
 		  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 		{ OPTION_BOOLEAN, 0, "allow-empty-message", &allow_empty_message, NULL,
-		  "ok to record a change with an empty message",
+		  N_("ok to record a change with an empty message"),
 		  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
 
 		OPT_END()
@@ -1437,8 +1419,10 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_commit_usage, builtin_commit_options);
 
 	wt_status_prepare(&s);
+	gitmodules_config();
 	git_config(git_commit_config, &s);
 	determine_whence(&s);
+	s.colopts = 0;
 
 	if (get_sha1("HEAD", sha1))
 		current_head = NULL;
diff --git a/builtin/config.c b/builtin/config.c
index 33c8820a..e1c33e06 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -4,7 +4,7 @@
 #include "parse-options.h"
 
 static const char *const builtin_config_usage[] = {
-	"git config [options]",
+	N_("git config [options]"),
 	NULL
 };
 
@@ -49,33 +49,33 @@ static int respect_includes = -1;
 #define TYPE_PATH (1<<3)
 
 static struct option builtin_config_options[] = {
-	OPT_GROUP("Config file location"),
-	OPT_BOOLEAN(0, "global", &use_global_config, "use global config file"),
-	OPT_BOOLEAN(0, "system", &use_system_config, "use system config file"),
-	OPT_BOOLEAN(0, "local", &use_local_config, "use repository config file"),
-	OPT_STRING('f', "file", &given_config_file, "file", "use given config file"),
-	OPT_GROUP("Action"),
-	OPT_BIT(0, "get", &actions, "get value: name [value-regex]", ACTION_GET),
-	OPT_BIT(0, "get-all", &actions, "get all values: key [value-regex]", ACTION_GET_ALL),
-	OPT_BIT(0, "get-regexp", &actions, "get values for regexp: name-regex [value-regex]", ACTION_GET_REGEXP),
-	OPT_BIT(0, "replace-all", &actions, "replace all matching variables: name value [value_regex]", ACTION_REPLACE_ALL),
-	OPT_BIT(0, "add", &actions, "adds a new variable: name value", ACTION_ADD),
-	OPT_BIT(0, "unset", &actions, "removes a variable: name [value-regex]", ACTION_UNSET),
-	OPT_BIT(0, "unset-all", &actions, "removes all matches: name [value-regex]", ACTION_UNSET_ALL),
-	OPT_BIT(0, "rename-section", &actions, "rename section: old-name new-name", ACTION_RENAME_SECTION),
-	OPT_BIT(0, "remove-section", &actions, "remove a section: name", ACTION_REMOVE_SECTION),
-	OPT_BIT('l', "list", &actions, "list all", ACTION_LIST),
-	OPT_BIT('e', "edit", &actions, "opens an editor", ACTION_EDIT),
-	OPT_STRING(0, "get-color", &get_color_slot, "slot", "find the color configured: [default]"),
-	OPT_STRING(0, "get-colorbool", &get_colorbool_slot, "slot", "find the color setting: [stdout-is-tty]"),
-	OPT_GROUP("Type"),
-	OPT_BIT(0, "bool", &types, "value is \"true\" or \"false\"", TYPE_BOOL),
-	OPT_BIT(0, "int", &types, "value is decimal number", TYPE_INT),
-	OPT_BIT(0, "bool-or-int", &types, "value is --bool or --int", TYPE_BOOL_OR_INT),
-	OPT_BIT(0, "path", &types, "value is a path (file or directory name)", TYPE_PATH),
-	OPT_GROUP("Other"),
-	OPT_BOOLEAN('z', "null", &end_null, "terminate values with NUL byte"),
-	OPT_BOOL(0, "includes", &respect_includes, "respect include directives on lookup"),
+	OPT_GROUP(N_("Config file location")),
+	OPT_BOOLEAN(0, "global", &use_global_config, N_("use global config file")),
+	OPT_BOOLEAN(0, "system", &use_system_config, N_("use system config file")),
+	OPT_BOOLEAN(0, "local", &use_local_config, N_("use repository config file")),
+	OPT_STRING('f', "file", &given_config_file, N_("file"), N_("use given config file")),
+	OPT_GROUP(N_("Action")),
+	OPT_BIT(0, "get", &actions, N_("get value: name [value-regex]"), ACTION_GET),
+	OPT_BIT(0, "get-all", &actions, N_("get all values: key [value-regex]"), ACTION_GET_ALL),
+	OPT_BIT(0, "get-regexp", &actions, N_("get values for regexp: name-regex [value-regex]"), ACTION_GET_REGEXP),
+	OPT_BIT(0, "replace-all", &actions, N_("replace all matching variables: name value [value_regex]"), ACTION_REPLACE_ALL),
+	OPT_BIT(0, "add", &actions, N_("add a new variable: name value"), ACTION_ADD),
+	OPT_BIT(0, "unset", &actions, N_("remove a variable: name [value-regex]"), ACTION_UNSET),
+	OPT_BIT(0, "unset-all", &actions, N_("remove all matches: name [value-regex]"), ACTION_UNSET_ALL),
+	OPT_BIT(0, "rename-section", &actions, N_("rename section: old-name new-name"), ACTION_RENAME_SECTION),
+	OPT_BIT(0, "remove-section", &actions, N_("remove a section: name"), ACTION_REMOVE_SECTION),
+	OPT_BIT('l', "list", &actions, N_("list all"), ACTION_LIST),
+	OPT_BIT('e', "edit", &actions, N_("open an editor"), ACTION_EDIT),
+	OPT_STRING(0, "get-color", &get_color_slot, N_("slot"), N_("find the color configured: [default]")),
+	OPT_STRING(0, "get-colorbool", &get_colorbool_slot, N_("slot"), N_("find the color setting: [stdout-is-tty]")),
+	OPT_GROUP(N_("Type")),
+	OPT_BIT(0, "bool", &types, N_("value is \"true\" or \"false\""), TYPE_BOOL),
+	OPT_BIT(0, "int", &types, N_("value is decimal number"), TYPE_INT),
+	OPT_BIT(0, "bool-or-int", &types, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
+	OPT_BIT(0, "path", &types, N_("value is a path (file or directory name)"), TYPE_PATH),
+	OPT_GROUP(N_("Other")),
+	OPT_BOOLEAN('z', "null", &end_null, N_("terminate values with NUL byte")),
+	OPT_BOOL(0, "includes", &respect_includes, N_("respect include directives on lookup")),
 	OPT_END(),
 };
 
@@ -160,8 +160,8 @@ static int show_config(const char *key_, const char *value_, void *cb)
 
 static int get_value(const char *key_, const char *regex_)
 {
-	int ret = -1;
-	char *global = NULL, *repo_config = NULL;
+	int ret = CONFIG_GENERIC_ERROR;
+	char *global = NULL, *xdg = NULL, *repo_config = NULL;
 	const char *system_wide = NULL, *local;
 	struct config_include_data inc = CONFIG_INCLUDE_INIT;
 	config_fn_t fn;
@@ -169,12 +169,10 @@ static int get_value(const char *key_, const char *regex_)
 
 	local = given_config_file;
 	if (!local) {
-		const char *home = getenv("HOME");
 		local = repo_config = git_pathdup("config");
-		if (home)
-			global = xstrdup(mkpath("%s/.gitconfig", home));
 		if (git_config_system())
 			system_wide = git_etc_gitconfig();
+		home_config_paths(&global, &xdg, "config");
 	}
 
 	if (use_key_regexp) {
@@ -198,11 +196,14 @@ static int get_value(const char *key_, const char *regex_)
 		if (regcomp(key_regexp, key, REG_EXTENDED)) {
 			fprintf(stderr, "Invalid key pattern: %s\n", key_);
 			free(key);
+			ret = CONFIG_INVALID_PATTERN;
 			goto free_strings;
 		}
 	} else {
-		if (git_config_parse_key(key_, &key, NULL))
+		if (git_config_parse_key(key_, &key, NULL)) {
+			ret = CONFIG_INVALID_KEY;
 			goto free_strings;
+		}
 	}
 
 	if (regex_) {
@@ -214,6 +215,7 @@ static int get_value(const char *key_, const char *regex_)
 		regexp = (regex_t*)xmalloc(sizeof(regex_t));
 		if (regcomp(regexp, regex_, REG_EXTENDED)) {
 			fprintf(stderr, "Invalid pattern: %s\n", regex_);
+			ret = CONFIG_INVALID_PATTERN;
 			goto free_strings;
 		}
 	}
@@ -229,6 +231,8 @@ static int get_value(const char *key_, const char *regex_)
 
 	if (do_all && system_wide)
 		git_config_from_file(fn, system_wide, data);
+	if (do_all && xdg)
+		git_config_from_file(fn, xdg, data);
 	if (do_all && global)
 		git_config_from_file(fn, global, data);
 	if (do_all)
@@ -238,6 +242,8 @@ static int get_value(const char *key_, const char *regex_)
 		git_config_from_file(fn, local, data);
 	if (!do_all && !seen && global)
 		git_config_from_file(fn, global, data);
+	if (!do_all && !seen && xdg)
+		git_config_from_file(fn, xdg, data);
 	if (!do_all && !seen && system_wide)
 		git_config_from_file(fn, system_wide, data);
 
@@ -255,6 +261,7 @@ static int get_value(const char *key_, const char *regex_)
 free_strings:
 	free(repo_config);
 	free(global);
+	free(xdg);
 	return ret;
 }
 
@@ -379,13 +386,25 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	}
 
 	if (use_global_config) {
-		char *home = getenv("HOME");
-		if (home) {
-			char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
-			given_config_file = user_config;
-		} else {
+		char *user_config = NULL;
+		char *xdg_config = NULL;
+
+		home_config_paths(&user_config, &xdg_config, "config");
+
+		if (!user_config)
+			/*
+			 * It is unknown if HOME/.gitconfig exists, so
+			 * we do not know if we should write to XDG
+			 * location; error out even if XDG_CONFIG_HOME
+			 * is set and points at a sane location.
+			 */
 			die("$HOME not set");
-		}
+
+		if (access_or_warn(user_config, R_OK) &&
+		    xdg_config && !access_or_warn(xdg_config, R_OK))
+			given_config_file = xdg_config;
+		else
+			given_config_file = user_config;
 	}
 	else if (use_system_config)
 		given_config_file = git_etc_gitconfig();
diff --git a/builtin/count-objects.c b/builtin/count-objects.c
index c37cb98c..9afaa88f 100644
--- a/builtin/count-objects.c
+++ b/builtin/count-objects.c
@@ -66,7 +66,7 @@ static void count_objects(DIR *d, char *path, int len, int verbose,
 }
 
 static char const * const count_objects_usage[] = {
-	"git count-objects [-v]",
+	N_("git count-objects [-v]"),
 	NULL
 };
 
@@ -79,7 +79,7 @@ int cmd_count_objects(int argc, const char **argv, const char *prefix)
 	unsigned long loose = 0, packed = 0, packed_loose = 0, garbage = 0;
 	off_t loose_size = 0;
 	struct option opts[] = {
-		OPT__VERBOSE(&verbose, "be verbose"),
+		OPT__VERBOSE(&verbose, N_("be verbose")),
 		OPT_END(),
 	};
 
diff --git a/builtin/credential.c b/builtin/credential.c
new file mode 100644
index 00000000..0412fa00
--- /dev/null
+++ b/builtin/credential.c
@@ -0,0 +1,31 @@
+#include "git-compat-util.h"
+#include "credential.h"
+#include "builtin.h"
+
+static const char usage_msg[] =
+	"git credential [fill|approve|reject]";
+
+int cmd_credential(int argc, const char **argv, const char *prefix)
+{
+	const char *op;
+	struct credential c = CREDENTIAL_INIT;
+
+	op = argv[1];
+	if (!op)
+		usage(usage_msg);
+
+	if (credential_read(&c, stdin) < 0)
+		die("unable to read credential from stdin");
+
+	if (!strcmp(op, "fill")) {
+		credential_fill(&c);
+		credential_write(&c, stdout);
+	} else if (!strcmp(op, "approve")) {
+		credential_approve(&c);
+	} else if (!strcmp(op, "reject")) {
+		credential_reject(&c);
+	} else {
+		usage(usage_msg);
+	}
+	return 0;
+}
diff --git a/builtin/describe.c b/builtin/describe.c
index 9f63067f..9fe11ed9 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -12,8 +12,8 @@
 #define MAX_TAGS	(FLAG_BITS - 1)
 
 static const char * const describe_usage[] = {
-	"git describe [options] <committish>*",
-	"git describe [options] --dirty",
+	N_("git describe [options] <committish>*"),
+	N_("git describe [options] --dirty"),
 	NULL
 };
 
@@ -400,22 +400,22 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
 {
 	int contains = 0;
 	struct option options[] = {
-		OPT_BOOLEAN(0, "contains",   &contains, "find the tag that comes after the commit"),
-		OPT_BOOLEAN(0, "debug",      &debug, "debug search strategy on stderr"),
-		OPT_BOOLEAN(0, "all",        &all, "use any ref in .git/refs"),
-		OPT_BOOLEAN(0, "tags",       &tags, "use any tag in .git/refs/tags"),
-		OPT_BOOLEAN(0, "long",       &longformat, "always use long format"),
+		OPT_BOOLEAN(0, "contains",   &contains, N_("find the tag that comes after the commit")),
+		OPT_BOOLEAN(0, "debug",      &debug, N_("debug search strategy on stderr")),
+		OPT_BOOLEAN(0, "all",        &all, N_("use any ref in .git/refs")),
+		OPT_BOOLEAN(0, "tags",       &tags, N_("use any tag in .git/refs/tags")),
+		OPT_BOOLEAN(0, "long",       &longformat, N_("always use long format")),
 		OPT__ABBREV(&abbrev),
 		OPT_SET_INT(0, "exact-match", &max_candidates,
-			    "only output exact matches", 0),
+			    N_("only output exact matches"), 0),
 		OPT_INTEGER(0, "candidates", &max_candidates,
-			    "consider <n> most recent tags (default: 10)"),
-		OPT_STRING(0, "match",       &pattern, "pattern",
-			   "only consider tags matching <pattern>"),
+			    N_("consider <n> most recent tags (default: 10)")),
+		OPT_STRING(0, "match",       &pattern, N_("pattern"),
+			   N_("only consider tags matching <pattern>")),
 		OPT_BOOLEAN(0, "always",     &always,
-			   "show abbreviated commit object as fallback"),
-		{OPTION_STRING, 0, "dirty",  &dirty, "mark",
-			   "append <mark> on dirty working tree (default: \"-dirty\")",
+			   N_("show abbreviated commit object as fallback")),
+		{OPTION_STRING, 0, "dirty",  &dirty, N_("mark"),
+			   N_("append <mark> on dirty working tree (default: \"-dirty\")"),
 		 PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
 		OPT_END(),
 	};
diff --git a/builtin/diff.c b/builtin/diff.c
index 9069dc41..9650be2c 100644
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -29,6 +29,8 @@ static void stuff_change(struct diff_options *opt,
 			 unsigned old_mode, unsigned new_mode,
 			 const unsigned char *old_sha1,
 			 const unsigned char *new_sha1,
+			 int old_sha1_valid,
+			 int new_sha1_valid,
 			 const char *old_name,
 			 const char *new_name)
 {
@@ -54,8 +56,8 @@ static void stuff_change(struct diff_options *opt,
 
 	one = alloc_filespec(old_name);
 	two = alloc_filespec(new_name);
-	fill_filespec(one, old_sha1, old_mode);
-	fill_filespec(two, new_sha1, new_mode);
+	fill_filespec(one, old_sha1, old_sha1_valid, old_mode);
+	fill_filespec(two, new_sha1, new_sha1_valid, new_mode);
 
 	diff_queue(&diff_queued_diff, one, two);
 }
@@ -84,6 +86,7 @@ static int builtin_diff_b_f(struct rev_info *revs,
 	stuff_change(&revs->diffopt,
 		     blob[0].mode, canon_mode(st.st_mode),
 		     blob[0].sha1, null_sha1,
+		     1, 0,
 		     path, path);
 	diffcore_std(&revs->diffopt);
 	diff_flush(&revs->diffopt);
@@ -108,6 +111,7 @@ static int builtin_diff_blobs(struct rev_info *revs,
 	stuff_change(&revs->diffopt,
 		     blob[0].mode, blob[1].mode,
 		     blob[0].sha1, blob[1].sha1,
+		     1, 1,
 		     blob[0].name, blob[1].name);
 	diffcore_std(&revs->diffopt);
 	diff_flush(&revs->diffopt);
@@ -298,19 +302,12 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 	argc = setup_revisions(argc, argv, &rev, NULL);
 	if (!rev.diffopt.output_format) {
 		rev.diffopt.output_format = DIFF_FORMAT_PATCH;
-		if (diff_setup_done(&rev.diffopt) < 0)
-			die(_("diff_setup_done failed"));
+		diff_setup_done(&rev.diffopt);
 	}
 
 	DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 
-	/*
-	 * If the user asked for our exit code then don't start a
-	 * pager or we would end up reporting its exit code instead.
-	 */
-	if (!DIFF_OPT_TST(&rev.diffopt, EXIT_WITH_STATUS) &&
-	    check_pager_config("diff") != 0)
-		setup_pager();
+	setup_diff_pager(&rev.diffopt);
 
 	/*
 	 * Do we have --cached and not have a pending object, then
@@ -421,3 +418,19 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 		refresh_index_quietly();
 	return result;
 }
+
+void setup_diff_pager(struct diff_options *opt)
+{
+	/*
+	 * If the user asked for our exit code, then either they want --quiet
+	 * or --exit-code. We should definitely not bother with a pager in the
+	 * former case, as we will generate no output. Since we still properly
+	 * report our exit code even when a pager is run, we _could_ run a
+	 * pager with --exit-code. But since we have not done so historically,
+	 * and because it is easy to find people oneline advising "git diff
+	 * --exit-code" in hooks and other scripts, we do not do so.
+	 */
+	if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
+	    check_pager_config("diff") != 0)
+		setup_pager();
+}
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 19509ea7..12220ad8 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -19,7 +19,7 @@
 #include "quote.h"
 
 static const char *fast_export_usage[] = {
-	"git fast-export [rev-list-opts]",
+	N_("git fast-export [rev-list-opts]"),
 	NULL
 };
 
@@ -185,6 +185,8 @@ static void print_path(const char *path)
 	int need_quote = quote_c_style(path, NULL, NULL, 0);
 	if (need_quote)
 		quote_c_style(path, NULL, stdout, 0);
+	else if (strchr(path, ' '))
+		printf("\"%s\"", path);
 	else
 		printf("%s", path);
 }
@@ -610,7 +612,7 @@ static void import_marks(char *input_file)
 			die ("Could not read blob %s", sha1_to_hex(sha1));
 
 		if (object->flags & SHOWN)
-			error("Object %s already has a mark", sha1);
+			error("Object %s already has a mark", sha1_to_hex(sha1));
 
 		mark_object(object, mark);
 		if (last_idnum < mark)
@@ -630,24 +632,24 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
 	char *export_filename = NULL, *import_filename = NULL;
 	struct option options[] = {
 		OPT_INTEGER(0, "progress", &progress,
-			    "show progress after <n> objects"),
-		OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode",
-			     "select handling of signed tags",
+			    N_("show progress after <n> objects")),
+		OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
+			     N_("select handling of signed tags"),
 			     parse_opt_signed_tag_mode),
-		OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, "mode",
-			     "select handling of tags that tag filtered objects",
+		OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
+			     N_("select handling of tags that tag filtered objects"),
 			     parse_opt_tag_of_filtered_mode),
-		OPT_STRING(0, "export-marks", &export_filename, "file",
-			     "Dump marks to this file"),
-		OPT_STRING(0, "import-marks", &import_filename, "file",
-			     "Import marks from this file"),
+		OPT_STRING(0, "export-marks", &export_filename, N_("file"),
+			     N_("Dump marks to this file")),
+		OPT_STRING(0, "import-marks", &import_filename, N_("file"),
+			     N_("Import marks from this file")),
 		OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
-			     "Fake a tagger when tags lack one"),
+			     N_("Fake a tagger when tags lack one")),
 		OPT_BOOLEAN(0, "full-tree", &full_tree,
-			     "Output full tree for each commit"),
+			     N_("Output full tree for each commit")),
 		OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
-			     "Use the done feature to terminate the stream"),
-		OPT_BOOL(0, "no-data", &no_data, "Skip output of blob data"),
+			     N_("Use the done feature to terminate the stream")),
+		OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 		OPT_END()
 	};
 
diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 10db15b1..e6443986 100644
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -10,6 +10,7 @@
 #include "remote.h"
 #include "run-command.h"
 #include "transport.h"
+#include "version.h"
 
 static int transfer_unpack_limit = -1;
 static int fetch_unpack_limit = -1;
@@ -18,6 +19,7 @@ static int prefer_ofs_delta = 1;
 static int no_done;
 static int fetch_fsck_objects = -1;
 static int transfer_fsck_objects = -1;
+static int agent_supported;
 static struct fetch_pack_args args = {
 	/* .uploadpack = */ "git-upload-pack",
 };
@@ -327,6 +329,8 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 			if (args.no_progress)   strbuf_addstr(&c, " no-progress");
 			if (args.include_tag)   strbuf_addstr(&c, " include-tag");
 			if (prefer_ofs_delta)   strbuf_addstr(&c, " ofs-delta");
+			if (agent_supported)    strbuf_addf(&c, " agent=%s",
+							    git_user_agent_sanitized());
 			packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf);
 			strbuf_release(&c);
 		} else
@@ -521,65 +525,59 @@ static void mark_recent_complete_commits(unsigned long cutoff)
 	}
 }
 
-static void filter_refs(struct ref **refs, int nr_match, char **match)
+static int non_matching_ref(struct string_list_item *item, void *unused)
+{
+	if (item->util) {
+		item->util = NULL;
+		return 0;
+	}
+	else
+		return 1;
+}
+
+static void filter_refs(struct ref **refs, struct string_list *sought)
 {
-	struct ref **return_refs;
 	struct ref *newlist = NULL;
 	struct ref **newtail = &newlist;
 	struct ref *ref, *next;
-	struct ref *fastarray[32];
-
-	if (nr_match && !args.fetch_all) {
-		if (ARRAY_SIZE(fastarray) < nr_match)
-			return_refs = xcalloc(nr_match, sizeof(struct ref *));
-		else {
-			return_refs = fastarray;
-			memset(return_refs, 0, sizeof(struct ref *) * nr_match);
-		}
-	}
-	else
-		return_refs = NULL;
+	int sought_pos;
 
+	sought_pos = 0;
 	for (ref = *refs; ref; ref = next) {
+		int keep = 0;
 		next = ref->next;
 		if (!memcmp(ref->name, "refs/", 5) &&
 		    check_refname_format(ref->name + 5, 0))
 			; /* trash */
-		else if (args.fetch_all &&
-			 (!args.depth || prefixcmp(ref->name, "refs/tags/") )) {
-			*newtail = ref;
-			ref->next = NULL;
-			newtail = &ref->next;
-			continue;
-		}
 		else {
-			int i;
-			for (i = 0; i < nr_match; i++) {
-				if (!strcmp(ref->name, match[i])) {
-					match[i][0] = '\0';
-					return_refs[i] = ref;
+			while (sought_pos < sought->nr) {
+				int cmp = strcmp(ref->name, sought->items[sought_pos].string);
+				if (cmp < 0)
+					break; /* definitely do not have it */
+				else if (cmp == 0) {
+					keep = 1; /* definitely have it */
+					sought->items[sought_pos++].util = "matched";
 					break;
 				}
+				else
+					sought_pos++; /* might have it; keep looking */
 			}
-			if (i < nr_match)
-				continue; /* we will link it later */
 		}
-		free(ref);
-	}
 
-	if (!args.fetch_all) {
-		int i;
-		for (i = 0; i < nr_match; i++) {
-			ref = return_refs[i];
-			if (ref) {
-				*newtail = ref;
-				ref->next = NULL;
-				newtail = &ref->next;
-			}
+		if (! keep && args.fetch_all &&
+		    (!args.depth || prefixcmp(ref->name, "refs/tags/")))
+			keep = 1;
+
+		if (keep) {
+			*newtail = ref;
+			ref->next = NULL;
+			newtail = &ref->next;
+		} else {
+			free(ref);
 		}
-		if (return_refs != fastarray)
-			free(return_refs);
 	}
+
+	filter_string_list(sought, 0, non_matching_ref, NULL);
 	*refs = newlist;
 }
 
@@ -588,7 +586,7 @@ static void mark_alternate_complete(const struct ref *ref, void *unused)
 	mark_complete(NULL, ref->old_sha1, 0, NULL);
 }
 
-static int everything_local(struct ref **refs, int nr_match, char **match)
+static int everything_local(struct ref **refs, struct string_list *sought)
 {
 	struct ref *ref;
 	int retval;
@@ -639,7 +637,7 @@ static int everything_local(struct ref **refs, int nr_match, char **match)
 		}
 	}
 
-	filter_refs(refs, nr_match, match);
+	filter_refs(refs, sought);
 
 	for (retval = 1, ref = *refs; ref ; ref = ref->next) {
 		const unsigned char *remote = ref->old_sha1;
@@ -770,12 +768,15 @@ static int get_pack(int xd[2], char **pack_lockfile)
 
 static struct ref *do_fetch_pack(int fd[2],
 		const struct ref *orig_ref,
-		int nr_match,
-		char **match,
+		struct string_list *sought,
 		char **pack_lockfile)
 {
 	struct ref *ref = copy_ref_list(orig_ref);
 	unsigned char sha1[20];
+	const char *agent_feature;
+	int agent_len;
+
+	sort_ref_list(&ref, ref_compare_name);
 
 	if (is_repository_shallow() && !server_supports("shallow"))
 		die("Server does not support shallow clients");
@@ -805,12 +806,26 @@ static struct ref *do_fetch_pack(int fd[2],
 			fprintf(stderr, "Server supports side-band\n");
 		use_sideband = 1;
 	}
+	if (!server_supports("thin-pack"))
+		args.use_thin_pack = 0;
+	if (!server_supports("no-progress"))
+		args.no_progress = 0;
+	if (!server_supports("include-tag"))
+		args.include_tag = 0;
 	if (server_supports("ofs-delta")) {
 		if (args.verbose)
 			fprintf(stderr, "Server supports ofs-delta\n");
 	} else
 		prefer_ofs_delta = 0;
-	if (everything_local(&ref, nr_match, match)) {
+
+	if ((agent_feature = server_feature_value("agent", &agent_len))) {
+		agent_supported = 1;
+		if (args.verbose && agent_len)
+			fprintf(stderr, "Server version is %.*s\n",
+				agent_len, agent_feature);
+	}
+
+	if (everything_local(&ref, sought)) {
 		packet_flush(fd[1]);
 		goto all_done;
 	}
@@ -830,28 +845,6 @@ static struct ref *do_fetch_pack(int fd[2],
 	return ref;
 }
 
-static int remove_duplicates(int nr_heads, char **heads)
-{
-	int src, dst;
-
-	for (src = dst = 0; src < nr_heads; src++) {
-		/* If heads[src] is different from any of
-		 * heads[0..dst], push it in.
-		 */
-		int i;
-		for (i = 0; i < dst; i++) {
-			if (!strcmp(heads[i], heads[src]))
-				break;
-		}
-		if (i < dst)
-			continue;
-		if (src != dst)
-			heads[dst] = heads[src];
-		dst++;
-	}
-	return dst;
-}
-
 static int fetch_pack_config(const char *var, const char *value, void *cb)
 {
 	if (strcmp(var, "fetch.unpacklimit") == 0) {
@@ -899,9 +892,10 @@ static void fetch_pack_setup(void)
 
 int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 {
-	int i, ret, nr_heads;
+	int i, ret;
 	struct ref *ref = NULL;
-	char *dest = NULL, **heads;
+	const char *dest = NULL;
+	struct string_list sought = STRING_LIST_INIT_DUP;
 	int fd[2];
 	char *pack_lockfile = NULL;
 	char **pack_lockfile_ptr = NULL;
@@ -909,84 +903,78 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 
 	packet_trace_identity("fetch-pack");
 
-	nr_heads = 0;
-	heads = NULL;
-	for (i = 1; i < argc; i++) {
+	for (i = 1; i < argc && *argv[i] == '-'; i++) {
 		const char *arg = argv[i];
 
-		if (*arg == '-') {
-			if (!prefixcmp(arg, "--upload-pack=")) {
-				args.uploadpack = arg + 14;
-				continue;
-			}
-			if (!prefixcmp(arg, "--exec=")) {
-				args.uploadpack = arg + 7;
-				continue;
-			}
-			if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) {
-				args.quiet = 1;
-				continue;
-			}
-			if (!strcmp("--keep", arg) || !strcmp("-k", arg)) {
-				args.lock_pack = args.keep_pack;
-				args.keep_pack = 1;
-				continue;
-			}
-			if (!strcmp("--thin", arg)) {
-				args.use_thin_pack = 1;
-				continue;
-			}
-			if (!strcmp("--include-tag", arg)) {
-				args.include_tag = 1;
-				continue;
-			}
-			if (!strcmp("--all", arg)) {
-				args.fetch_all = 1;
-				continue;
-			}
-			if (!strcmp("--stdin", arg)) {
-				args.stdin_refs = 1;
-				continue;
-			}
-			if (!strcmp("-v", arg)) {
-				args.verbose = 1;
-				continue;
-			}
-			if (!prefixcmp(arg, "--depth=")) {
-				args.depth = strtol(arg + 8, NULL, 0);
-				continue;
-			}
-			if (!strcmp("--no-progress", arg)) {
-				args.no_progress = 1;
-				continue;
-			}
-			if (!strcmp("--stateless-rpc", arg)) {
-				args.stateless_rpc = 1;
-				continue;
-			}
-			if (!strcmp("--lock-pack", arg)) {
-				args.lock_pack = 1;
-				pack_lockfile_ptr = &pack_lockfile;
-				continue;
-			}
-			usage(fetch_pack_usage);
+		if (!prefixcmp(arg, "--upload-pack=")) {
+			args.uploadpack = arg + 14;
+			continue;
+		}
+		if (!prefixcmp(arg, "--exec=")) {
+			args.uploadpack = arg + 7;
+			continue;
+		}
+		if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) {
+			args.quiet = 1;
+			continue;
 		}
-		dest = (char *)arg;
-		heads = (char **)(argv + i + 1);
-		nr_heads = argc - i - 1;
-		break;
+		if (!strcmp("--keep", arg) || !strcmp("-k", arg)) {
+			args.lock_pack = args.keep_pack;
+			args.keep_pack = 1;
+			continue;
+		}
+		if (!strcmp("--thin", arg)) {
+			args.use_thin_pack = 1;
+			continue;
+		}
+		if (!strcmp("--include-tag", arg)) {
+			args.include_tag = 1;
+			continue;
+		}
+		if (!strcmp("--all", arg)) {
+			args.fetch_all = 1;
+			continue;
+		}
+		if (!strcmp("--stdin", arg)) {
+			args.stdin_refs = 1;
+			continue;
+		}
+		if (!strcmp("-v", arg)) {
+			args.verbose = 1;
+			continue;
+		}
+		if (!prefixcmp(arg, "--depth=")) {
+			args.depth = strtol(arg + 8, NULL, 0);
+			continue;
+		}
+		if (!strcmp("--no-progress", arg)) {
+			args.no_progress = 1;
+			continue;
+		}
+		if (!strcmp("--stateless-rpc", arg)) {
+			args.stateless_rpc = 1;
+			continue;
+		}
+		if (!strcmp("--lock-pack", arg)) {
+			args.lock_pack = 1;
+			pack_lockfile_ptr = &pack_lockfile;
+			continue;
+		}
+		usage(fetch_pack_usage);
 	}
-	if (!dest)
+
+	if (i < argc)
+		dest = argv[i++];
+	else
 		usage(fetch_pack_usage);
 
+	/*
+	 * Copy refs from cmdline to growable list, then append any
+	 * refs from the standard input:
+	 */
+	for (; i < argc; i++)
+		string_list_append(&sought, xstrdup(argv[i]));
 	if (args.stdin_refs) {
-		/*
-		 * Copy refs from cmdline to new growable list, then
-		 * append the refs from the standard input.
-		 */
-		int alloc_heads = nr_heads;
-		int size = nr_heads * sizeof(*heads);
-		heads = memcpy(xmalloc(size), heads, size);
 		if (args.stateless_rpc) {
 			/* in stateless RPC mode we use pkt-line to read
 			 * from stdin, until we get a flush packet
@@ -998,17 +986,14 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 					break;
 				if (line[n-1] == '\n')
 					n--;
-				ALLOC_GROW(heads, nr_heads + 1, alloc_heads);
-				heads[nr_heads++] = xmemdupz(line, n);
+				string_list_append(&sought, xmemdupz(line, n));
 			}
 		}
 		else {
 			/* read from stdin one ref per line, until EOF */
 			struct strbuf line = STRBUF_INIT;
-			while (strbuf_getline(&line, stdin, '\n') != EOF) {
-				ALLOC_GROW(heads, nr_heads + 1, alloc_heads);
-				heads[nr_heads++] = strbuf_detach(&line, NULL);
-			}
+			while (strbuf_getline(&line, stdin, '\n') != EOF)
+				string_list_append(&sought, strbuf_detach(&line, NULL));
 			strbuf_release(&line);
 		}
 	}
@@ -1018,14 +1003,14 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 		fd[0] = 0;
 		fd[1] = 1;
 	} else {
-		conn = git_connect(fd, (char *)dest, args.uploadpack,
+		conn = git_connect(fd, dest, args.uploadpack,
 				   args.verbose ? CONNECT_VERBOSE : 0);
 	}
 
 	get_remote_heads(fd[0], &ref, 0, NULL);
 
 	ref = fetch_pack(&args, fd, conn, ref, dest,
-		nr_heads, heads, pack_lockfile_ptr);
+			 &sought, pack_lockfile_ptr);
 	if (pack_lockfile) {
 		printf("lock %s\n", pack_lockfile);
 		fflush(stdout);
@@ -1033,21 +1018,18 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 	close(fd[0]);
 	close(fd[1]);
 	if (finish_connect(conn))
-		ref = NULL;
-	ret = !ref;
-
-	if (!ret && nr_heads) {
-		/* If the heads to pull were given, we should have
-		 * consumed all of them by matching the remote.
-		 * Otherwise, 'git fetch remote no-such-ref' would
-		 * silently succeed without issuing an error.
-		 */
-		for (i = 0; i < nr_heads; i++)
-			if (heads[i] && heads[i][0]) {
-				error("no such remote ref %s", heads[i]);
-				ret = 1;
-			}
-	}
+		return 1;
+
+	ret = !ref || sought.nr;
+
+	/*
+	 * If the heads to pull were given, we should have consumed
+	 * all of them by matching the remote.  Otherwise, 'git fetch
+	 * remote no-such-ref' would silently succeed without issuing
+	 * an error.
+	 */
+	for (i = 0; i < sought.nr; i++)
+		error("no such remote ref %s", sought.items[i].string);
 	while (ref) {
 		printf("%s %s\n",
 		       sha1_to_hex(ref->old_sha1), ref->name);
@@ -1060,10 +1042,9 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 struct ref *fetch_pack(struct fetch_pack_args *my_args,
 		       int fd[], struct child_process *conn,
 		       const struct ref *ref,
-		const char *dest,
-		int nr_heads,
-		char **heads,
-		char **pack_lockfile)
+		       const char *dest,
+		       struct string_list *sought,
+		       char **pack_lockfile)
 {
 	struct stat st;
 	struct ref *ref_cpy;
@@ -1076,13 +1057,16 @@ struct ref *fetch_pack(struct fetch_pack_args *my_args,
 			st.st_mtime = 0;
 	}
 
-	if (heads && nr_heads)
-		nr_heads = remove_duplicates(nr_heads, heads);
+	if (sought->nr) {
+		sort_string_list(sought);
+		string_list_remove_duplicates(sought, 0);
+	}
+
 	if (!ref) {
 		packet_flush(fd[1]);
 		die("no matching remote head");
 	}
-	ref_cpy = do_fetch_pack(fd, ref, nr_heads, heads, pack_lockfile);
+	ref_cpy = do_fetch_pack(fd, ref, sought, pack_lockfile);
 
 	if (args.depth > 0) {
 		struct cache_time mtime;
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 1c8cb624..4b5a8983 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -14,12 +14,13 @@
 #include "transport.h"
 #include "submodule.h"
 #include "connected.h"
+#include "argv-array.h"
 
 static const char * const builtin_fetch_usage[] = {
-	"git fetch [<options>] [<repository> [<refspec>...]]",
-	"git fetch [<options>] <group>",
-	"git fetch --multiple [<options>] [(<repository> | <group>)...]",
-	"git fetch --all [<options>]",
+	N_("git fetch [<options>] [<repository> [<refspec>...]]"),
+	N_("git fetch [<options>] <group>"),
+	N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
+	N_("git fetch --all [<options>]"),
 	NULL
 };
 
@@ -56,36 +57,36 @@ static int option_parse_recurse_submodules(const struct option *opt,
 static struct option builtin_fetch_options[] = {
 	OPT__VERBOSITY(&verbosity),
 	OPT_BOOLEAN(0, "all", &all,
-		    "fetch from all remotes"),
+		    N_("fetch from all remotes")),
 	OPT_BOOLEAN('a', "append", &append,
-		    "append to .git/FETCH_HEAD instead of overwriting"),
-	OPT_STRING(0, "upload-pack", &upload_pack, "path",
-		   "path to upload pack on remote end"),
-	OPT__FORCE(&force, "force overwrite of local branch"),
+		    N_("append to .git/FETCH_HEAD instead of overwriting")),
+	OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
+		   N_("path to upload pack on remote end")),
+	OPT__FORCE(&force, N_("force overwrite of local branch")),
 	OPT_BOOLEAN('m', "multiple", &multiple,
-		    "fetch from multiple remotes"),
+		    N_("fetch from multiple remotes")),
 	OPT_SET_INT('t', "tags", &tags,
-		    "fetch all tags and associated objects", TAGS_SET),
+		    N_("fetch all tags and associated objects"), TAGS_SET),
 	OPT_SET_INT('n', NULL, &tags,
-		    "do not fetch all tags (--no-tags)", TAGS_UNSET),
+		    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 	OPT_BOOLEAN('p', "prune", &prune,
-		    "prune remote-tracking branches no longer on remote"),
-	{ OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
-		    "control recursive fetching of submodules",
+		    N_("prune remote-tracking branches no longer on remote")),
+	{ OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
+		    N_("control recursive fetching of submodules"),
 		    PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 	OPT_BOOLEAN(0, "dry-run", &dry_run,
-		    "dry run"),
-	OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
+		    N_("dry run")),
+	OPT_BOOLEAN('k', "keep", &keep, N_("keep downloaded pack")),
 	OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
-		    "allow updating of HEAD ref"),
-	OPT_BOOL(0, "progress", &progress, "force progress reporting"),
-	OPT_STRING(0, "depth", &depth, "depth",
-		   "deepen history of shallow clone"),
-	{ OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
-		   "prepend this to submodule path output", PARSE_OPT_HIDDEN },
+		    N_("allow updating of HEAD ref")),
+	OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
+	OPT_STRING(0, "depth", &depth, N_("depth"),
+		   N_("deepen history of shallow clone")),
+	{ OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
+		   N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 	{ OPTION_STRING, 0, "recurse-submodules-default",
 		   &recurse_submodules_default, NULL,
-		   "default mode for recursion", PARSE_OPT_HIDDEN },
+		   N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 	OPT_END()
 };
 
@@ -255,9 +256,8 @@ static int update_local_ref(struct ref *ref,
 	if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 		if (verbosity > 0)
 			strbuf_addf(display, "= %-*s %-*s -> %s",
-				    TRANSPORT_SUMMARY_WIDTH,
-				    _("[up to date]"), REFCOL_WIDTH,
-				    remote, pretty_ref);
+				    TRANSPORT_SUMMARY(_("[up to date]")),
+				    REFCOL_WIDTH, remote, pretty_ref);
 		return 0;
 	}
 
@@ -271,7 +271,7 @@ static int update_local_ref(struct ref *ref,
 		 */
 		strbuf_addf(display,
 			    _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
-			    TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
+			    TRANSPORT_SUMMARY(_("[rejected]")),
 			    REFCOL_WIDTH, remote, pretty_ref);
 		return 1;
 	}
@@ -282,7 +282,7 @@ static int update_local_ref(struct ref *ref,
 		r = s_update_ref("updating tag", ref, 0);
 		strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 			    r ? '!' : '-',
-			    TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
+			    TRANSPORT_SUMMARY(_("[tag update]")),
 			    REFCOL_WIDTH, remote, pretty_ref,
 			    r ? _("  (unable to update local ref)") : "");
 		return r;
@@ -317,13 +317,13 @@ static int update_local_ref(struct ref *ref,
 		r = s_update_ref(msg, ref, 0);
 		strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 			    r ? '!' : '*',
-			    TRANSPORT_SUMMARY_WIDTH, what,
+			    TRANSPORT_SUMMARY(what),
 			    REFCOL_WIDTH, remote, pretty_ref,
 			    r ? _("  (unable to update local ref)") : "");
 		return r;
 	}
 
-	if (in_merge_bases(current, &updated, 1)) {
+	if (in_merge_bases(current, updated)) {
 		char quickref[83];
 		int r;
 		strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
@@ -357,7 +357,7 @@ static int update_local_ref(struct ref *ref,
 		return r;
 	} else {
 		strbuf_addf(display, "! %-*s %-*s -> %s  %s",
-			    TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
+			    TRANSPORT_SUMMARY(_("[rejected]")),
 			    REFCOL_WIDTH, remote, pretty_ref,
 			    _("(non-fast-forward)"));
 		return 1;
@@ -546,15 +546,15 @@ static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 	int result = 0;
 	struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 	const char *dangling_msg = dry_run
-		? _("   (%s will become dangling)\n")
-		: _("   (%s has become dangling)\n");
+		? _("   (%s will become dangling)")
+		: _("   (%s has become dangling)");
 
 	for (ref = stale_refs; ref; ref = ref->next) {
 		if (!dry_run)
 			result |= delete_ref(ref->name, NULL, 0);
 		if (verbosity >= 0) {
 			fprintf(stderr, " x %-*s %-*s -> %s\n",
-				TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
+				TRANSPORT_SUMMARY(_("[deleted]")),
 				REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 			warn_dangling_symref(stderr, dangling_msg, ref->name);
 		}
@@ -841,38 +841,39 @@ static int add_remote_or_group(const char *name, struct string_list *list)
 	return 1;
 }
 
-static void add_options_to_argv(int *argc, const char **argv)
+static void add_options_to_argv(struct argv_array *argv)
 {
 	if (dry_run)
-		argv[(*argc)++] = "--dry-run";
+		argv_array_push(argv, "--dry-run");
 	if (prune)
-		argv[(*argc)++] = "--prune";
+		argv_array_push(argv, "--prune");
 	if (update_head_ok)
-		argv[(*argc)++] = "--update-head-ok";
+		argv_array_push(argv, "--update-head-ok");
 	if (force)
-		argv[(*argc)++] = "--force";
+		argv_array_push(argv, "--force");
 	if (keep)
-		argv[(*argc)++] = "--keep";
+		argv_array_push(argv, "--keep");
 	if (recurse_submodules == RECURSE_SUBMODULES_ON)
-		argv[(*argc)++] = "--recurse-submodules";
+		argv_array_push(argv, "--recurse-submodules");
 	else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
-		argv[(*argc)++] = "--recurse-submodules=on-demand";
+		argv_array_push(argv, "--recurse-submodules=on-demand");
+	if (tags == TAGS_SET)
+		argv_array_push(argv, "--tags");
+	else if (tags == TAGS_UNSET)
+		argv_array_push(argv, "--no-tags");
 	if (verbosity >= 2)
-		argv[(*argc)++] = "-v";
+		argv_array_push(argv, "-v");
 	if (verbosity >= 1)
-		argv[(*argc)++] = "-v";
+		argv_array_push(argv, "-v");
 	else if (verbosity < 0)
-		argv[(*argc)++] = "-q";
+		argv_array_push(argv, "-q");
 
 }
 
 static int fetch_multiple(struct string_list *list)
 {
 	int i, result = 0;
-	const char *argv[12] = { "fetch", "--append" };
-	int argc = 2;
-
-	add_options_to_argv(&argc, argv);
+	struct argv_array argv = ARGV_ARRAY_INIT;
 
 	if (!append && !dry_run) {
 		int errcode = truncate_fetch_head();
@@ -880,18 +881,22 @@ static int fetch_multiple(struct string_list *list)
 			return errcode;
 	}
 
+	argv_array_pushl(&argv, "fetch", "--append", NULL);
+	add_options_to_argv(&argv);
+
 	for (i = 0; i < list->nr; i++) {
 		const char *name = list->items[i].string;
-		argv[argc] = name;
-		argv[argc + 1] = NULL;
+		argv_array_push(&argv, name);
 		if (verbosity >= 0)
 			printf(_("Fetching %s\n"), name);
-		if (run_command_v_opt(argv, RUN_GIT_CMD)) {
+		if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
 			error(_("Could not fetch %s"), name);
 			result = 1;
 		}
+		argv_array_pop(&argv);
 	}
 
+	argv_array_clear(&argv);
 	return result;
 }
 
@@ -1007,13 +1012,14 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	}
 
 	if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
-		const char *options[10];
-		int num_options = 0;
-		add_options_to_argv(&num_options, options);
-		result = fetch_populated_submodules(num_options, options,
+		struct argv_array options = ARGV_ARRAY_INIT;
+
+		add_options_to_argv(&options);
+		result = fetch_populated_submodules(&options,
 						    submodule_prefix,
 						    recurse_submodules,
 						    verbosity < 0);
+		argv_array_clear(&options);
 	}
 
 	/* All names were strdup()ed or strndup()ed */
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index fb1ebcbe..e2e27b2c 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -10,7 +10,7 @@
 #include "gpg-interface.h"
 
 static const char * const fmt_merge_msg_usage[] = {
-	"git fmt-merge-msg [-m <message>] [--log[=<n>]|--no-log] [--file <file>]",
+	N_("git fmt-merge-msg [-m <message>] [--log[=<n>]|--no-log] [--file <file>]"),
 	NULL
 };
 
@@ -27,6 +27,8 @@ int fmt_merge_msg_config(const char *key, const char *value, void *cb)
 			merge_log_config = DEFAULT_MERGE_LOG_LEN;
 	} else if (!strcmp(key, "merge.branchdesc")) {
 		use_branch_desc = git_config_bool(key, value);
+	} else {
+		return git_default_config(key, value, cb);
 	}
 	return 0;
 }
@@ -223,6 +225,101 @@ static void add_branch_desc(struct strbuf *out, const char *name)
 	strbuf_release(&desc);
 }
 
+#define util_as_integral(elem) ((intptr_t)((elem)->util))
+
+static void record_person(int which, struct string_list *people,
+			  struct commit *commit)
+{
+	char *name_buf, *name, *name_end;
+	struct string_list_item *elem;
+	const char *field = (which == 'a') ? "\nauthor " : "\ncommitter ";
+
+	name = strstr(commit->buffer, field);
+	if (!name)
+		return;
+	name += strlen(field);
+	name_end = strchrnul(name, '<');
+	if (*name_end)
+		name_end--;
+	while (isspace(*name_end) && name <= name_end)
+		name_end--;
+	if (name_end < name)
+		return;
+	name_buf = xmemdupz(name, name_end - name + 1);
+
+	elem = string_list_lookup(people, name_buf);
+	if (!elem) {
+		elem = string_list_insert(people, name_buf);
+		elem->util = (void *)0;
+	}
+	elem->util = (void*)(util_as_integral(elem) + 1);
+	free(name_buf);
+}
+
+static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
+{
+	const struct string_list_item *a = a_, *b = b_;
+	return util_as_integral(b) - util_as_integral(a);
+}
+
+static void add_people_count(struct strbuf *out, struct string_list *people)
+{
+	if (people->nr == 1)
+		strbuf_addf(out, "%s", people->items[0].string);
+	else if (people->nr == 2)
+		strbuf_addf(out, "%s (%d) and %s (%d)",
+			    people->items[0].string,
+			    (int)util_as_integral(&people->items[0]),
+			    people->items[1].string,
+			    (int)util_as_integral(&people->items[1]));
+	else if (people->nr)
+		strbuf_addf(out, "%s (%d) and others",
+			    people->items[0].string,
+			    (int)util_as_integral(&people->items[0]));
+}
+
+static void credit_people(struct strbuf *out,
+			  struct string_list *them,
+			  int kind)
+{
+	const char *label;
+	const char *me;
+
+	if (kind == 'a') {
+		label = "\n# By ";
+		me = git_author_info(IDENT_NO_DATE);
+	} else {
+		label = "\n# Via ";
+		me = git_committer_info(IDENT_NO_DATE);
+	}
+
+	if (!them->nr ||
+	    (them->nr == 1 &&
+	     me &&
+	     (me = skip_prefix(me, them->items->string)) != NULL &&
+	     skip_prefix(me, " <")))
+		return;
+	strbuf_addstr(out, label);
+	add_people_count(out, them);
+}
+
+static void add_people_info(struct strbuf *out,
+			    struct string_list *authors,
+			    struct string_list *committers)
+{
+	if (authors->nr)
+		qsort(authors->items,
+		      authors->nr, sizeof(authors->items[0]),
+		      cmp_string_list_util_as_integral);
+	if (committers->nr)
+		qsort(committers->items,
+		      committers->nr, sizeof(committers->items[0]),
+		      cmp_string_list_util_as_integral);
+
+	credit_people(out, authors, 'a');
+	credit_people(out, committers, 'c');
+}
+
 static void shortlog(const char *name,
 		     struct origin_data *origin_data,
 		     struct commit *head,
@@ -233,6 +330,8 @@ static void shortlog(const char *name,
 	struct commit *commit;
 	struct object *branch;
 	struct string_list subjects = STRING_LIST_INIT_DUP;
+	struct string_list authors = STRING_LIST_INIT_DUP;
+	struct string_list committers = STRING_LIST_INIT_DUP;
 	int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
 	struct strbuf sb = STRBUF_INIT;
 	const unsigned char *sha1 = origin_data->sha1;
@@ -242,7 +341,6 @@ static void shortlog(const char *name,
 		return;
 
 	setup_revisions(0, NULL, rev, NULL);
-	rev->ignore_merges = 1;
 	add_pending_object(rev, branch, name);
 	add_pending_object(rev, &head->object, "^HEAD");
 	head->object.flags |= UNINTERESTING;
@@ -251,10 +349,15 @@ static void shortlog(const char *name,
 	while ((commit = get_revision(rev)) != NULL) {
 		struct pretty_print_context ctx = {0};
 
-		/* ignore merges */
-		if (commit->parents && commit->parents->next)
+		if (commit->parents && commit->parents->next) {
+			/* do not list a merge but count committer */
+			record_person('c', &committers, commit);
 			continue;
-
+		}
+		if (!count)
+			/* the 'tip' committer */
+			record_person('c', &committers, commit);
+		record_person('a', &authors, commit);
 		count++;
 		if (subjects.nr > limit)
 			continue;
@@ -269,6 +372,7 @@ static void shortlog(const char *name,
 			string_list_append(&subjects, strbuf_detach(&sb, NULL));
 	}
 
+	add_people_info(out, &authors, &committers);
 	if (count > limit)
 		strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
 	else
@@ -289,6 +393,8 @@ static void shortlog(const char *name,
 	rev->commits = NULL;
 	rev->pending.nr = 0;
 
+	string_list_clear(&authors, 0);
+	string_list_clear(&committers, 0);
 	string_list_clear(&subjects, 0);
 }
 
@@ -544,16 +650,16 @@ int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 	const char *message = NULL;
 	int shortlog_len = -1;
 	struct option options[] = {
-		{ OPTION_INTEGER, 0, "log", &shortlog_len, "n",
-		  "populate log with at most <n> entries from shortlog",
+		{ OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
+		  N_("populate log with at most <n> entries from shortlog"),
 		  PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
-		{ OPTION_INTEGER, 0, "summary", &shortlog_len, "n",
-		  "alias for --log (deprecated)",
+		{ OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
+		  N_("alias for --log (deprecated)"),
 		  PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
 		  DEFAULT_MERGE_LOG_LEN },
-		OPT_STRING('m', "message", &message, "text",
-			"use <text> as start of message"),
-		OPT_FILENAME('F', "file", &inpath, "file to read from"),
+		OPT_STRING('m', "message", &message, N_("text"),
+			N_("use <text> as start of message")),
+		OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
 		OPT_END()
 	};
 
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index b01d76a2..7f059c31 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -962,7 +962,9 @@ static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 	if (!arg) /* should --no-sort void the list ? */
 		return -1;
 
-	*sort_tail = s = xcalloc(1, sizeof(*s));
+	s = xcalloc(1, sizeof(*s));
+	s->next = *sort_tail;
+	*sort_tail = s;
 
 	if (*arg == '-') {
 		s->reverse = 1;
@@ -974,7 +976,7 @@ static int opt_parse_sort(const struct option *opt, const char *arg, int unset)
 }
 
 static char const * const for_each_ref_usage[] = {
-	"git for-each-ref [options] [<pattern>]",
+	N_("git for-each-ref [options] [<pattern>]"),
 	NULL
 };
 
@@ -989,19 +991,19 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 
 	struct option opts[] = {
 		OPT_BIT('s', "shell", &quote_style,
-		        "quote placeholders suitably for shells", QUOTE_SHELL),
+			N_("quote placeholders suitably for shells"), QUOTE_SHELL),
 		OPT_BIT('p', "perl",  &quote_style,
-		        "quote placeholders suitably for perl", QUOTE_PERL),
+			N_("quote placeholders suitably for perl"), QUOTE_PERL),
 		OPT_BIT(0 , "python", &quote_style,
-		        "quote placeholders suitably for python", QUOTE_PYTHON),
+			N_("quote placeholders suitably for python"), QUOTE_PYTHON),
 		OPT_BIT(0 , "tcl",  &quote_style,
-		        "quote placeholders suitably for tcl", QUOTE_TCL),
+			N_("quote placeholders suitably for tcl"), QUOTE_TCL),
 
 		OPT_GROUP(""),
-		OPT_INTEGER( 0 , "count", &maxcount, "show only <n> matched refs"),
-		OPT_STRING(  0 , "format", &format, "format", "format to use for the output"),
-		OPT_CALLBACK(0 , "sort", sort_tail, "key",
-		            "field name to sort on", &opt_parse_sort),
+		OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
+		OPT_STRING(  0 , "format", &format, N_("format"), N_("format to use for the output")),
+		OPT_CALLBACK(0 , "sort", sort_tail, N_("key"),
+			    N_("field name to sort on"), &opt_parse_sort),
 		OPT_END(),
 	};
 
diff --git a/builtin/fsck.c b/builtin/fsck.c
index 67eb553c..bb9a2cd4 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -12,6 +12,7 @@
 #include "parse-options.h"
 #include "dir.h"
 #include "progress.h"
+#include "streaming.h"
 
 #define REACHABLE 0x0001
 #define SEEN      0x0002
@@ -238,13 +239,8 @@ static void check_unreachable_object(struct object *obj)
 			if (!(f = fopen(filename, "w")))
 				die_errno("Could not open '%s'", filename);
 			if (obj->type == OBJ_BLOB) {
-				enum object_type type;
-				unsigned long size;
-				char *buf = read_sha1_file(obj->sha1,
-						&type, &size);
-				if (buf && fwrite(buf, 1, size, f) != size)
+				if (stream_blob_to_fd(fileno(f), obj->sha1, NULL, 1))
 					die_errno("Could not write '%s'", filename);
-				free(buf);
 			} else
 				fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
 			if (fclose(f))
@@ -609,23 +605,23 @@ static int fsck_cache_tree(struct cache_tree *it)
 }
 
 static char const * const fsck_usage[] = {
-	"git fsck [options] [<object>...]",
+	N_("git fsck [options] [<object>...]"),
 	NULL
 };
 
 static struct option fsck_opts[] = {
-	OPT__VERBOSE(&verbose, "be verbose"),
-	OPT_BOOLEAN(0, "unreachable", &show_unreachable, "show unreachable objects"),
-	OPT_BOOL(0, "dangling", &show_dangling, "show dangling objects"),
-	OPT_BOOLEAN(0, "tags", &show_tags, "report tags"),
-	OPT_BOOLEAN(0, "root", &show_root, "report root nodes"),
-	OPT_BOOLEAN(0, "cache", &keep_cache_objects, "make index objects head nodes"),
-	OPT_BOOLEAN(0, "reflogs", &include_reflogs, "make reflogs head nodes (default)"),
-	OPT_BOOLEAN(0, "full", &check_full, "also consider packs and alternate objects"),
-	OPT_BOOLEAN(0, "strict", &check_strict, "enable more strict checking"),
+	OPT__VERBOSE(&verbose, N_("be verbose")),
+	OPT_BOOLEAN(0, "unreachable", &show_unreachable, N_("show unreachable objects")),
+	OPT_BOOL(0, "dangling", &show_dangling, N_("show dangling objects")),
+	OPT_BOOLEAN(0, "tags", &show_tags, N_("report tags")),
+	OPT_BOOLEAN(0, "root", &show_root, N_("report root nodes")),
+	OPT_BOOLEAN(0, "cache", &keep_cache_objects, N_("make index objects head nodes")),
+	OPT_BOOLEAN(0, "reflogs", &include_reflogs, N_("make reflogs head nodes (default)")),
+	OPT_BOOLEAN(0, "full", &check_full, N_("also consider packs and alternate objects")),
+	OPT_BOOLEAN(0, "strict", &check_strict, N_("enable more strict checking")),
 	OPT_BOOLEAN(0, "lost-found", &write_lost_and_found,
-				"write dangling objects in .git/lost-found"),
-	OPT_BOOL(0, "progress", &show_progress, "show progress"),
+				N_("write dangling objects in .git/lost-found")),
+	OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 	OPT_END(),
 };
 
diff --git a/builtin/gc.c b/builtin/gc.c
index 9b4232c8..6be6c8d6 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -19,7 +19,7 @@
 #define FAILED_RUN "failed to run %s"
 
 static const char * const builtin_gc_usage[] = {
-	"git gc [options]",
+	N_("git gc [options]"),
 	NULL
 };
 
@@ -174,12 +174,12 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
 	int quiet = 0;
 
 	struct option builtin_gc_options[] = {
-		OPT__QUIET(&quiet, "suppress progress reporting"),
-		{ OPTION_STRING, 0, "prune", &prune_expire, "date",
-			"prune unreferenced objects",
+		OPT__QUIET(&quiet, N_("suppress progress reporting")),
+		{ OPTION_STRING, 0, "prune", &prune_expire, N_("date"),
+			N_("prune unreferenced objects"),
 			PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
-		OPT_BOOLEAN(0, "aggressive", &aggressive, "be more thorough (increased runtime)"),
-		OPT_BOOLEAN(0, "auto", &auto_gc, "enable auto-gc mode"),
+		OPT_BOOLEAN(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")),
+		OPT_BOOLEAN(0, "auto", &auto_gc, N_("enable auto-gc mode")),
 		OPT_END()
 	};
 
@@ -217,9 +217,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
 		 */
 		if (!need_to_gc())
 			return 0;
-		if (quiet)
-			fprintf(stderr, _("Auto packing the repository for optimum performance.\n"));
-		else
+		if (!quiet)
 			fprintf(stderr,
 					_("Auto packing the repository for optimum performance. You may also\n"
 					"run \"git gc\" manually. See "
diff --git a/builtin/grep.c b/builtin/grep.c
index fe1726f5..82530a61 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -19,7 +19,7 @@
 #include "dir.h"
 
 static char const * const grep_usage[] = {
-	"git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]",
+	N_("git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]"),
 	NULL
 };
 
@@ -209,6 +209,7 @@ static void start_threads(struct grep_opt *opt)
 		int err;
 		struct grep_opt *o = grep_opt_dup(opt);
 		o->output = strbuf_out;
+		o->debug = 0;
 		compile_grep_patterns(o);
 		err = pthread_create(&threads[i], NULL, run, o);
 
@@ -260,6 +261,53 @@ static int wait_all(void)
 }
 #endif
 
+static int parse_pattern_type_arg(const char *opt, const char *arg)
+{
+	if (!strcmp(arg, "default"))
+		return GREP_PATTERN_TYPE_UNSPECIFIED;
+	else if (!strcmp(arg, "basic"))
+		return GREP_PATTERN_TYPE_BRE;
+	else if (!strcmp(arg, "extended"))
+		return GREP_PATTERN_TYPE_ERE;
+	else if (!strcmp(arg, "fixed"))
+		return GREP_PATTERN_TYPE_FIXED;
+	else if (!strcmp(arg, "perl"))
+		return GREP_PATTERN_TYPE_PCRE;
+	die("bad %s argument: %s", opt, arg);
+}
+
+static void grep_pattern_type_options(const int pattern_type, struct grep_opt *opt)
+{
+	switch (pattern_type) {
+	case GREP_PATTERN_TYPE_UNSPECIFIED:
+		/* fall through */
+
+	case GREP_PATTERN_TYPE_BRE:
+		opt->fixed = 0;
+		opt->pcre = 0;
+		opt->regflags &= ~REG_EXTENDED;
+		break;
+
+	case GREP_PATTERN_TYPE_ERE:
+		opt->fixed = 0;
+		opt->pcre = 0;
+		opt->regflags |= REG_EXTENDED;
+		break;
+
+	case GREP_PATTERN_TYPE_FIXED:
+		opt->fixed = 1;
+		opt->pcre = 0;
+		opt->regflags &= ~REG_EXTENDED;
+		break;
+
+	case GREP_PATTERN_TYPE_PCRE:
+		opt->fixed = 0;
+		opt->pcre = 1;
+		opt->regflags &= ~REG_EXTENDED;
+		break;
+	}
+}
+
 static int grep_config(const char *var, const char *value, void *cb)
 {
 	struct grep_opt *opt = cb;
@@ -270,12 +318,17 @@ static int grep_config(const char *var, const char *value, void *cb)
 
 	if (!strcmp(var, "grep.extendedregexp")) {
 		if (git_config_bool(var, value))
-			opt->regflags |= REG_EXTENDED;
+			opt->extended_regexp_option = 1;
 		else
-			opt->regflags &= ~REG_EXTENDED;
+			opt->extended_regexp_option = 0;
 		return 0;
 	}
 
+	if (!strcmp(var, "grep.patterntype")) {
+		opt->pattern_type_option = parse_pattern_type_arg(var, value);
+		return 0;
+  }
+
 	if (!strcmp(var, "grep.linenumber")) {
 		opt->linenum = git_config_bool(var, value);
 		return 0;
@@ -669,95 +722,88 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	int i;
 	int dummy;
 	int use_index = 1;
-	enum {
-		pattern_type_unspecified = 0,
-		pattern_type_bre,
-		pattern_type_ere,
-		pattern_type_fixed,
-		pattern_type_pcre,
-	};
-	int pattern_type = pattern_type_unspecified;
+	int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 
 	struct option options[] = {
 		OPT_BOOLEAN(0, "cached", &cached,
-			"search in index instead of in the work tree"),
+			N_("search in index instead of in the work tree")),
 		OPT_NEGBIT(0, "no-index", &use_index,
-			 "finds in contents not managed by git", 1),
+			 N_("find in contents not managed by git"), 1),
 		OPT_BOOLEAN(0, "untracked", &untracked,
-			"search in both tracked and untracked files"),
+			N_("search in both tracked and untracked files")),
 		OPT_SET_INT(0, "exclude-standard", &opt_exclude,
-			    "search also in ignored files", 1),
+			    N_("search also in ignored files"), 1),
 		OPT_GROUP(""),
 		OPT_BOOLEAN('v', "invert-match", &opt.invert,
-			"show non-matching lines"),
+			N_("show non-matching lines")),
 		OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
-			"case insensitive matching"),
+			N_("case insensitive matching")),
 		OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
-			"match patterns only at word boundaries"),
+			N_("match patterns only at word boundaries")),
 		OPT_SET_INT('a', "text", &opt.binary,
-			"process binary files as text", GREP_BINARY_TEXT),
+			N_("process binary files as text"), GREP_BINARY_TEXT),
 		OPT_SET_INT('I', NULL, &opt.binary,
-			"don't match patterns in binary files",
+			N_("don't match patterns in binary files"),
 			GREP_BINARY_NOMATCH),
-		{ OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
-			"descend at most <depth> levels", PARSE_OPT_NONEG,
+		{ OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
+			N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
 			NULL, 1 },
 		OPT_GROUP(""),
-		OPT_SET_INT('E', "extended-regexp", &pattern_type,
-			    "use extended POSIX regular expressions",
-			    pattern_type_ere),
-		OPT_SET_INT('G', "basic-regexp", &pattern_type,
-			    "use basic POSIX regular expressions (default)",
-			    pattern_type_bre),
-		OPT_SET_INT('F', "fixed-strings", &pattern_type,
-			    "interpret patterns as fixed strings",
-			    pattern_type_fixed),
-		OPT_SET_INT('P', "perl-regexp", &pattern_type,
-			    "use Perl-compatible regular expressions",
-			    pattern_type_pcre),
+		OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
+			    N_("use extended POSIX regular expressions"),
+			    GREP_PATTERN_TYPE_ERE),
+		OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
+			    N_("use basic POSIX regular expressions (default)"),
+			    GREP_PATTERN_TYPE_BRE),
+		OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
+			    N_("interpret patterns as fixed strings"),
+			    GREP_PATTERN_TYPE_FIXED),
+		OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
+			    N_("use Perl-compatible regular expressions"),
+			    GREP_PATTERN_TYPE_PCRE),
 		OPT_GROUP(""),
-		OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
-		OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
-		OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
+		OPT_BOOLEAN('n', "line-number", &opt.linenum, N_("show line numbers")),
+		OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
+		OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
 		OPT_NEGBIT(0, "full-name", &opt.relative,
-			"show filenames relative to top directory", 1),
+			N_("show filenames relative to top directory"), 1),
 		OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
-			"show only filenames instead of matching lines"),
+			N_("show only filenames instead of matching lines")),
 		OPT_BOOLEAN(0, "name-only", &opt.name_only,
-			"synonym for --files-with-matches"),
+			N_("synonym for --files-with-matches")),
 		OPT_BOOLEAN('L', "files-without-match",
 			&opt.unmatch_name_only,
-			"show only the names of files without match"),
+			N_("show only the names of files without match")),
 		OPT_BOOLEAN('z', "null", &opt.null_following_name,
-			"print NUL after filenames"),
+			N_("print NUL after filenames")),
 		OPT_BOOLEAN('c', "count", &opt.count,
-			"show the number of matches instead of matching lines"),
-		OPT__COLOR(&opt.color, "highlight matches"),
+			N_("show the number of matches instead of matching lines")),
+		OPT__COLOR(&opt.color, N_("highlight matches")),
 		OPT_BOOLEAN(0, "break", &opt.file_break,
-			"print empty line between matches from different files"),
+			N_("print empty line between matches from different files")),
 		OPT_BOOLEAN(0, "heading", &opt.heading,
-			"show filename only once above matches from same file"),
+			N_("show filename only once above matches from same file")),
 		OPT_GROUP(""),
-		OPT_CALLBACK('C', "context", &opt, "n",
-			"show <n> context lines before and after matches",
+		OPT_CALLBACK('C', "context", &opt, N_("n"),
+			N_("show <n> context lines before and after matches"),
 			context_callback),
 		OPT_INTEGER('B', "before-context", &opt.pre_context,
-			"show <n> context lines before matches"),
+			N_("show <n> context lines before matches")),
 		OPT_INTEGER('A', "after-context", &opt.post_context,
-			"show <n> context lines after matches"),
-		OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
+			N_("show <n> context lines after matches")),
+		OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
 			context_callback),
 		OPT_BOOLEAN('p', "show-function", &opt.funcname,
-			"show a line with the function name before matches"),
+			N_("show a line with the function name before matches")),
 		OPT_BOOLEAN('W', "function-context", &opt.funcbody,
-			"show the surrounding function"),
+			N_("show the surrounding function")),
 		OPT_GROUP(""),
-		OPT_CALLBACK('f', NULL, &opt, "file",
-			"read patterns from file", file_callback),
-		{ OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
-			"match <pattern>", PARSE_OPT_NONEG, pattern_callback },
+		OPT_CALLBACK('f', NULL, &opt, N_("file"),
+			N_("read patterns from file"), file_callback),
+		{ OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
+			N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
 		{ OPTION_CALLBACK, 0, "and", &opt, NULL,
-		  "combine patterns specified with -e",
+		  N_("combine patterns specified with -e"),
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
 		OPT_BOOLEAN(0, "or", &dummy, ""),
 		{ OPTION_CALLBACK, 0, "not", &opt, NULL, "",
@@ -769,16 +815,19 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 		  close_callback },
 		OPT__QUIET(&opt.status_only,
-			   "indicate hit with exit status without output"),
+			   N_("indicate hit with exit status without output")),
 		OPT_BOOLEAN(0, "all-match", &opt.all_match,
-			"show only matches from files that match all patterns"),
+			N_("show only matches from files that match all patterns")),
+		{ OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
+		  N_("show parse tree for grep expression"),
+		  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
 		OPT_GROUP(""),
 		{ OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
-			"pager", "show matching files in the pager",
+			N_("pager"), N_("show matching files in the pager"),
 			PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
 		OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
-			    "allow calling of grep(1) (ignored by this build)"),
-		{ OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
+			    N_("allow calling of grep(1) (ignored by this build)")),
+		{ OPTION_CALLBACK, 0, "help-all", &options, NULL, N_("show usage"),
 		  PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 		OPT_END()
 	};
@@ -799,6 +848,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	opt.header_tail = &opt.header_list;
 	opt.regflags = REG_NEWLINE;
 	opt.max_depth = -1;
+	opt.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
+	opt.extended_regexp_option = 0;
 
 	strcpy(opt.color_context, "");
 	strcpy(opt.color_filename, "");
@@ -824,28 +875,13 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 			     PARSE_OPT_KEEP_DASHDASH |
 			     PARSE_OPT_STOP_AT_NON_OPTION |
 			     PARSE_OPT_NO_INTERNAL_HELP);
-	switch (pattern_type) {
-	case pattern_type_fixed:
-		opt.fixed = 1;
-		opt.pcre = 0;
-		break;
-	case pattern_type_bre:
-		opt.fixed = 0;
-		opt.pcre = 0;
-		opt.regflags &= ~REG_EXTENDED;
-		break;
-	case pattern_type_ere:
-		opt.fixed = 0;
-		opt.pcre = 0;
-		opt.regflags |= REG_EXTENDED;
-		break;
-	case pattern_type_pcre:
-		opt.fixed = 0;
-		opt.pcre = 1;
-		break;
-	default:
-		break; /* nothing */
-	}
+
+	if (pattern_type_arg != GREP_PATTERN_TYPE_UNSPECIFIED)
+		grep_pattern_type_options(pattern_type_arg, &opt);
+	else if (opt.pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
+		grep_pattern_type_options(opt.pattern_type_option, &opt);
+	else if (opt.extended_regexp_option)
+		grep_pattern_type_options(GREP_PATTERN_TYPE_ERE, &opt);
 
 	if (use_index && !startup_info->have_repository)
 		/* die the same way as if we did it at the beginning */
@@ -928,7 +964,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 	if (!seen_dashdash) {
 		int j;
 		for (j = i; j < argc; j++)
-			verify_filename(prefix, argv[j]);
+			verify_filename(prefix, argv[j], j == i);
 	}
 
 	paths = get_pathspec(prefix, argv + i);
diff --git a/builtin/hash-object.c b/builtin/hash-object.c
index 33911fd5..8d184f1a 100644
--- a/builtin/hash-object.c
+++ b/builtin/hash-object.c
@@ -57,8 +57,8 @@ static void hash_stdin_paths(const char *type, int write_objects)
 }
 
 static const char * const hash_object_usage[] = {
-	"git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>...",
-	"git hash-object  --stdin-paths < <list-of-paths>",
+	N_("git hash-object [-t <type>] [-w] [--path=<file>|--no-filters] [--stdin] [--] <file>..."),
+	N_("git hash-object  --stdin-paths < <list-of-paths>"),
 	NULL
 };
 
@@ -69,12 +69,12 @@ static int stdin_paths;
 static const char *vpath;
 
 static const struct option hash_object_options[] = {
-	OPT_STRING('t', NULL, &type, "type", "object type"),
-	OPT_BOOLEAN('w', NULL, &write_object, "write the object into the object database"),
-	OPT_BOOLEAN( 0 , "stdin", &hashstdin, "read the object from stdin"),
-	OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, "read file names from stdin"),
-	OPT_BOOLEAN( 0 , "no-filters", &no_filters, "store file as is without filters"),
-	OPT_STRING( 0 , "path", &vpath, "file", "process file as it were from this path"),
+	OPT_STRING('t', NULL, &type, N_("type"), N_("object type")),
+	OPT_BOOLEAN('w', NULL, &write_object, N_("write the object into the object database")),
+	OPT_BOOLEAN( 0 , "stdin", &hashstdin, N_("read the object from stdin")),
+	OPT_BOOLEAN( 0 , "stdin-paths", &stdin_paths, N_("read file names from stdin")),
+	OPT_BOOLEAN( 0 , "no-filters", &no_filters, N_("store file as is without filters")),
+	OPT_STRING( 0 , "path", &vpath, N_("file"), N_("process file as it were from this path")),
 	OPT_END()
 };
 
diff --git a/builtin/help.c b/builtin/help.c
index 61ff7983..bd86253d 100644
--- a/builtin/help.c
+++ b/builtin/help.c
@@ -9,8 +9,13 @@
 #include "common-cmds.h"
 #include "parse-options.h"
 #include "run-command.h"
+#include "column.h"
 #include "help.h"
 
+#ifndef DEFAULT_HELP_FORMAT
+#define DEFAULT_HELP_FORMAT "man"
+#endif
+
 static struct man_viewer_list {
 	struct man_viewer_list *next;
 	char name[FLEX_ARRAY];
@@ -29,20 +34,23 @@ enum help_format {
 	HELP_FORMAT_WEB
 };
 
+static const char *html_path;
+
 static int show_all = 0;
+static unsigned int colopts;
 static enum help_format help_format = HELP_FORMAT_NONE;
 static struct option builtin_help_options[] = {
-	OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
-	OPT_SET_INT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
-	OPT_SET_INT('w', "web", &help_format, "show manual in web browser",
+	OPT_BOOLEAN('a', "all", &show_all, N_("print all available commands")),
+	OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),
+	OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
 			HELP_FORMAT_WEB),
-	OPT_SET_INT('i', "info", &help_format, "show info page",
+	OPT_SET_INT('i', "info", &help_format, N_("show info page"),
 			HELP_FORMAT_INFO),
 	OPT_END(),
 };
 
 static const char * const builtin_help_usage[] = {
-	"git help [--all] [--man|--web|--info] [command]",
+	N_("git help [--all] [--man|--web|--info] [command]"),
 	NULL
 };
 
@@ -54,7 +62,7 @@ static enum help_format parse_help_format(const char *format)
 		return HELP_FORMAT_INFO;
 	if (!strcmp(format, "web") || !strcmp(format, "html"))
 		return HELP_FORMAT_WEB;
-	die("unrecognized help format '%s'", format);
+	die(_("unrecognized help format '%s'"), format);
 }
 
 static const char *get_man_viewer_info(const char *name)
@@ -82,7 +90,7 @@ static int check_emacsclient_version(void)
 	ec_process.err = -1;
 	ec_process.stdout_to_stderr = 1;
 	if (start_command(&ec_process))
-		return error("Failed to start emacsclient.");
+		return error(_("Failed to start emacsclient."));
 
 	strbuf_read(&buffer, ec_process.err, 20);
 	close(ec_process.err);
@@ -95,7 +103,7 @@ static int check_emacsclient_version(void)
 
 	if (prefixcmp(buffer.buf, "emacsclient")) {
 		strbuf_release(&buffer);
-		return error("Failed to parse emacsclient version.");
+		return error(_("Failed to parse emacsclient version."));
 	}
 
 	strbuf_remove(&buffer, 0, strlen("emacsclient"));
@@ -103,7 +111,7 @@ static int check_emacsclient_version(void)
 
 	if (version < 22) {
 		strbuf_release(&buffer);
-		return error("emacsclient version '%d' too old (< 22).",
+		return error(_("emacsclient version '%d' too old (< 22)."),
 			version);
 	}
 
@@ -121,7 +129,7 @@ static void exec_woman_emacs(const char *path, const char *page)
 			path = "emacsclient";
 		strbuf_addf(&man_page, "(woman \"%s\")", page);
 		execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL);
-		warning("failed to exec '%s': %s", path, strerror(errno));
+		warning(_("failed to exec '%s': %s"), path, strerror(errno));
 	}
 }
 
@@ -149,7 +157,7 @@ static void exec_man_konqueror(const char *path, const char *page)
 			path = "kfmclient";
 		strbuf_addf(&man_page, "man:%s(1)", page);
 		execlp(path, filename, "newTab", man_page.buf, (char *)NULL);
-		warning("failed to exec '%s': %s", path, strerror(errno));
+		warning(_("failed to exec '%s': %s"), path, strerror(errno));
 	}
 }
 
@@ -158,7 +166,7 @@ static void exec_man_man(const char *path, const char *page)
 	if (!path)
 		path = "man";
 	execlp(path, "man", page, (char *)NULL);
-	warning("failed to exec '%s': %s", path, strerror(errno));
+	warning(_("failed to exec '%s': %s"), path, strerror(errno));
 }
 
 static void exec_man_cmd(const char *cmd, const char *page)
@@ -166,7 +174,7 @@ static void exec_man_cmd(const char *cmd, const char *page)
 	struct strbuf shell_cmd = STRBUF_INIT;
 	strbuf_addf(&shell_cmd, "%s %s", cmd, page);
 	execl("/bin/sh", "sh", "-c", shell_cmd.buf, (char *)NULL);
-	warning("failed to exec '%s': %s", cmd, strerror(errno));
+	warning(_("failed to exec '%s': %s"), cmd, strerror(errno));
 }
 
 static void add_man_viewer(const char *name)
@@ -206,8 +214,8 @@ static int add_man_viewer_path(const char *name,
 	if (supported_man_viewer(name, len))
 		do_add_man_viewer_info(name, len, value);
 	else
-		warning("'%s': path for unsupported man viewer.\n"
-			"Please consider using 'man.<tool>.cmd' instead.",
+		warning(_("'%s': path for unsupported man viewer.\n"
+			  "Please consider using 'man.<tool>.cmd' instead."),
 			name);
 
 	return 0;
@@ -218,8 +226,8 @@ static int add_man_viewer_cmd(const char *name,
 			      const char *value)
 {
 	if (supported_man_viewer(name, len))
-		warning("'%s': cmd for supported man viewer.\n"
-			"Please consider using 'man.<tool>.path' instead.",
+		warning(_("'%s': cmd for supported man viewer.\n"
+			  "Please consider using 'man.<tool>.path' instead."),
 			name);
 	else
 		do_add_man_viewer_info(name, len, value);
@@ -251,12 +259,20 @@ static int add_man_viewer_info(const char *var, const char *value)
 
 static int git_help_config(const char *var, const char *value, void *cb)
 {
+	if (!prefixcmp(var, "column."))
+		return git_column_config(var, value, "help", &colopts);
 	if (!strcmp(var, "help.format")) {
 		if (!value)
 			return config_error_nonbool(var);
 		help_format = parse_help_format(value);
 		return 0;
 	}
+	if (!strcmp(var, "help.htmlpath")) {
+		if (!value)
+			return config_error_nonbool(var);
+		html_path = xstrdup(value);
+		return 0;
+	}
 	if (!strcmp(var, "man.viewer")) {
 		if (!value)
 			return config_error_nonbool(var);
@@ -280,11 +296,11 @@ void list_common_cmds_help(void)
 			longest = strlen(common_cmds[i].name);
 	}
 
-	puts("The most commonly used git commands are:");
+	puts(_("The most commonly used git commands are:"));
 	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
 		printf("   %s   ", common_cmds[i].name);
 		mput_char(' ', longest - strlen(common_cmds[i].name));
-		puts(common_cmds[i].help);
+		puts(_(common_cmds[i].help));
 	}
 }
 
@@ -348,7 +364,7 @@ static void exec_viewer(const char *name, const char *page)
 	else if (info)
 		exec_man_cmd(info, page);
 	else
-		warning("'%s': unknown man viewer.", name);
+		warning(_("'%s': unknown man viewer."), name);
 }
 
 static void show_man_page(const char *git_cmd)
@@ -365,7 +381,7 @@ static void show_man_page(const char *git_cmd)
 	if (fallback)
 		exec_viewer(fallback, page);
 	exec_viewer("man", page);
-	die("no man viewer handled the request");
+	die(_("no man viewer handled the request"));
 }
 
 static void show_info_page(const char *git_cmd)
@@ -373,18 +389,21 @@ static void show_info_page(const char *git_cmd)
 	const char *page = cmd_to_page(git_cmd);
 	setenv("INFOPATH", system_path(GIT_INFO_PATH), 1);
 	execlp("info", "info", "gitman", page, (char *)NULL);
-	die("no info viewer handled the request");
+	die(_("no info viewer handled the request"));
 }
 
 static void get_html_page_path(struct strbuf *page_path, const char *page)
 {
 	struct stat st;
-	const char *html_path = system_path(GIT_HTML_PATH);
+	if (!html_path)
+		html_path = system_path(GIT_HTML_PATH);
 
 	/* Check that we have a git documentation directory. */
-	if (stat(mkpath("%s/git.html", html_path), &st)
-	    || !S_ISREG(st.st_mode))
-		die("'%s': not a documentation directory.", html_path);
+	if (!strstr(html_path, "://")) {
+		if (stat(mkpath("%s/git.html", html_path), &st)
+		    || !S_ISREG(st.st_mode))
+			die("'%s': not a documentation directory.", html_path);
+	}
 
 	strbuf_init(page_path, 0);
 	strbuf_addf(page_path, "%s/%s.html", html_path, page);
@@ -424,16 +443,17 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 	parsed_help_format = help_format;
 
 	if (show_all) {
-		printf("usage: %s\n\n", git_usage_string);
-		list_commands("git commands", &main_cmds, &other_cmds);
-		printf("%s\n", git_more_info_string);
+		git_config(git_help_config, NULL);
+		printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
+		list_commands(colopts, &main_cmds, &other_cmds);
+		printf("%s\n", _(git_more_info_string));
 		return 0;
 	}
 
 	if (!argv[0]) {
-		printf("usage: %s\n\n", git_usage_string);
+		printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 		list_common_cmds_help();
-		printf("\n%s\n", git_more_info_string);
+		printf("\n%s\n", _(git_more_info_string));
 		return 0;
 	}
 
@@ -442,10 +462,12 @@ int cmd_help(int argc, const char **argv, const char *prefix)
 
 	if (parsed_help_format != HELP_FORMAT_NONE)
 		help_format = parsed_help_format;
+	if (help_format == HELP_FORMAT_NONE)
+		help_format = parse_help_format(DEFAULT_HELP_FORMAT);
 
 	alias = alias_lookup(argv[0]);
 	if (alias && !is_git_command(argv[0])) {
-		printf("`git %s' is aliased to `%s'\n", argv[0], alias);
+		printf_ln(_("`git %s' is aliased to `%s'"), argv[0], alias);
 		return 0;
 	}
 
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index dd1c5c96..43d364b8 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -9,6 +9,8 @@
 #include "progress.h"
 #include "fsck.h"
 #include "exec_cmd.h"
+#include "streaming.h"
+#include "thread-utils.h"
 
 static const char index_pack_usage[] =
 "git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
@@ -38,6 +40,19 @@ struct base_data {
 	int ofs_first, ofs_last;
 };
 
+#if !defined(NO_PTHREADS) && defined(NO_THREAD_SAFE_PREAD)
+/* pread() emulation is not thread-safe. Disable threading. */
+#define NO_PTHREADS
+#endif
+
+struct thread_local {
+#ifndef NO_PTHREADS
+	pthread_t thread;
+#endif
+	struct base_data *base_cache;
+	size_t base_cache_used;
+};
+
 /*
  * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want
  * to memcmp() only the first 20 bytes.
@@ -54,11 +69,11 @@ struct delta_entry {
 
 static struct object_entry *objects;
 static struct delta_entry *deltas;
-static struct base_data *base_cache;
-static size_t base_cache_used;
+static struct thread_local nothread_data;
 static int nr_objects;
 static int nr_deltas;
 static int nr_resolved_deltas;
+static int nr_threads;
 
 static int from_stdin;
 static int strict;
@@ -75,13 +90,84 @@ static git_SHA_CTX input_ctx;
 static uint32_t input_crc32;
 static int input_fd, output_fd, pack_fd;
 
+#ifndef NO_PTHREADS
+
+static struct thread_local *thread_data;
+static int nr_dispatched;
+static int threads_active;
+
+static pthread_mutex_t read_mutex;
+#define read_lock()		lock_mutex(&read_mutex)
+#define read_unlock()		unlock_mutex(&read_mutex)
+
+static pthread_mutex_t counter_mutex;
+#define counter_lock()		lock_mutex(&counter_mutex)
+#define counter_unlock()	unlock_mutex(&counter_mutex)
+
+static pthread_mutex_t work_mutex;
+#define work_lock()		lock_mutex(&work_mutex)
+#define work_unlock()		unlock_mutex(&work_mutex)
+
+static pthread_key_t key;
+
+static inline void lock_mutex(pthread_mutex_t *mutex)
+{
+	if (threads_active)
+		pthread_mutex_lock(mutex);
+}
+
+static inline void unlock_mutex(pthread_mutex_t *mutex)
+{
+	if (threads_active)
+		pthread_mutex_unlock(mutex);
+}
+
+/*
+ * Mutex and conditional variable can't be statically-initialized on Windows.
+ */
+static void init_thread(void)
+{
+	init_recursive_mutex(&read_mutex);
+	pthread_mutex_init(&counter_mutex, NULL);
+	pthread_mutex_init(&work_mutex, NULL);
+	pthread_key_create(&key, NULL);
+	thread_data = xcalloc(nr_threads, sizeof(*thread_data));
+	threads_active = 1;
+}
+
+static void cleanup_thread(void)
+{
+	if (!threads_active)
+		return;
+	threads_active = 0;
+	pthread_mutex_destroy(&read_mutex);
+	pthread_mutex_destroy(&counter_mutex);
+	pthread_mutex_destroy(&work_mutex);
+	pthread_key_delete(key);
+	free(thread_data);
+}
+
+#else
+
+#define read_lock()
+#define read_unlock()
+
+#define counter_lock()
+#define counter_unlock()
+
+#define work_lock()
+#define work_unlock()
+
+#endif
+
+
 static int mark_link(struct object *obj, int type, void *data)
 {
 	if (!obj)
 		return -1;
 
 	if (type != OBJ_ANY && obj->type != type)
-		die("object type mismatch at %s", sha1_to_hex(obj->sha1));
+		die(_("object type mismatch at %s"), sha1_to_hex(obj->sha1));
 
 	obj->flags |= FLAG_LINK;
 	return 0;
@@ -101,7 +187,7 @@ static void check_object(struct object *obj)
 		unsigned long size;
 		int type = sha1_object_info(obj->sha1, &size);
 		if (type != obj->type || type <= 0)
-			die("object of unexpected type");
+			die(_("object of unexpected type"));
 		obj->flags |= FLAG_CHECKED;
 		return;
 	}
@@ -138,15 +224,18 @@ static void *fill(int min)
 	if (min <= input_len)
 		return input_buffer + input_offset;
 	if (min > sizeof(input_buffer))
-		die("cannot fill %d bytes", min);
+		die(Q_("cannot fill %d byte",
+		       "cannot fill %d bytes",
+		       min),
+		    min);
 	flush();
 	do {
 		ssize_t ret = xread(input_fd, input_buffer + input_len,
 				sizeof(input_buffer) - input_len);
 		if (ret <= 0) {
 			if (!ret)
-				die("early EOF");
-			die_errno("read error on input");
+				die(_("early EOF"));
+			die_errno(_("read error on input"));
 		}
 		input_len += ret;
 		if (from_stdin)
@@ -158,14 +247,14 @@ static void *fill(int min)
 static void use(int bytes)
 {
 	if (bytes > input_len)
-		die("used more bytes than were available");
+		die(_("used more bytes than were available"));
 	input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
 	input_len -= bytes;
 	input_offset += bytes;
 
 	/* make sure off_t is sufficiently large not to wrap */
 	if (signed_add_overflows(consumed_bytes, bytes))
-		die("pack too large for current definition of off_t");
+		die(_("pack too large for current definition of off_t"));
 	consumed_bytes += bytes;
 }
 
@@ -181,12 +270,12 @@ static const char *open_pack_file(const char *pack_name)
 		} else
 			output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
 		if (output_fd < 0)
-			die_errno("unable to create '%s'", pack_name);
+			die_errno(_("unable to create '%s'"), pack_name);
 		pack_fd = output_fd;
 	} else {
 		input_fd = open(pack_name, O_RDONLY);
 		if (input_fd < 0)
-			die_errno("cannot open packfile '%s'", pack_name);
+			die_errno(_("cannot open packfile '%s'"), pack_name);
 		output_fd = -1;
 		pack_fd = input_fd;
 	}
@@ -200,9 +289,9 @@ static void parse_pack_header(void)
 
 	/* Header consistency check */
 	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
-		die("pack signature mismatch");
+		die(_("pack signature mismatch"));
 	if (!pack_version_ok(hdr->hdr_version))
-		die("pack version %"PRIu32" unsupported",
+		die(_("pack version %"PRIu32" unsupported"),
 			ntohl(hdr->hdr_version));
 
 	nr_objects = ntohl(hdr->hdr_entries);
@@ -220,9 +309,28 @@ static NORETURN void bad_object(unsigned long offset, const char *format, ...)
 	va_start(params, format);
 	vsnprintf(buf, sizeof(buf), format, params);
 	va_end(params);
-	die("pack has bad object at offset %lu: %s", offset, buf);
+	die(_("pack has bad object at offset %lu: %s"), offset, buf);
+}
+
+static inline struct thread_local *get_thread_data(void)
+{
+#ifndef NO_PTHREADS
+	if (threads_active)
+		return pthread_getspecific(key);
+	assert(!threads_active &&
+	       "This should only be reached when all threads are gone");
+#endif
+	return &nothread_data;
 }
 
+#ifndef NO_PTHREADS
+static void set_thread_data(struct thread_local *data)
+{
+	if (threads_active)
+		pthread_setspecific(key, data);
+}
+#endif
+
 static struct base_data *alloc_base_data(void)
 {
 	struct base_data *base = xmalloc(sizeof(struct base_data));
@@ -237,15 +345,16 @@ static void free_base_data(struct base_data *c)
 	if (c->data) {
 		free(c->data);
 		c->data = NULL;
-		base_cache_used -= c->size;
+		get_thread_data()->base_cache_used -= c->size;
 	}
 }
 
 static void prune_base_data(struct base_data *retain)
 {
 	struct base_data *b;
-	for (b = base_cache;
-	     base_cache_used > delta_base_cache_limit && b;
+	struct thread_local *data = get_thread_data();
+	for (b = data->base_cache;
+	     data->base_cache_used > delta_base_cache_limit && b;
 	     b = b->child) {
 		if (b->data && b != retain)
 			free_base_data(b);
@@ -257,12 +366,12 @@ static void link_base_data(struct base_data *base, struct base_data *c)
 	if (base)
 		base->child = c;
 	else
-		base_cache = c;
+		get_thread_data()->base_cache = c;
 
 	c->base = base;
 	c->child = NULL;
 	if (c->data)
-		base_cache_used += c->size;
+		get_thread_data()->base_cache_used += c->size;
 	prune_base_data(c);
 }
 
@@ -272,34 +381,66 @@ static void unlink_base_data(struct base_data *c)
 	if (base)
 		base->child = NULL;
 	else
-		base_cache = NULL;
+		get_thread_data()->base_cache = NULL;
 	free_base_data(c);
 }
 
-static void *unpack_entry_data(unsigned long offset, unsigned long size)
+static int is_delta_type(enum object_type type)
+{
+	return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
+}
+
+static void *unpack_entry_data(unsigned long offset, unsigned long size,
+			       enum object_type type, unsigned char *sha1)
 {
+	static char fixed_buf[8192];
 	int status;
 	git_zstream stream;
-	void *buf = xmalloc(size);
+	void *buf;
+	git_SHA_CTX c;
+	char hdr[32];
+	int hdrlen;
+
+	if (!is_delta_type(type)) {
+		hdrlen = sprintf(hdr, "%s %lu", typename(type), size) + 1;
+		git_SHA1_Init(&c);
+		git_SHA1_Update(&c, hdr, hdrlen);
+	} else
+		sha1 = NULL;
+	if (type == OBJ_BLOB && size > big_file_threshold)
+		buf = fixed_buf;
+	else
+		buf = xmalloc(size);
 
 	memset(&stream, 0, sizeof(stream));
 	git_inflate_init(&stream);
 	stream.next_out = buf;
-	stream.avail_out = size;
+	stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
 
 	do {
+		unsigned char *last_out = stream.next_out;
 		stream.next_in = fill(1);
 		stream.avail_in = input_len;
 		status = git_inflate(&stream, 0);
 		use(input_len - stream.avail_in);
+		if (sha1)
+			git_SHA1_Update(&c, last_out, stream.next_out - last_out);
+		if (buf == fixed_buf) {
+			stream.next_out = buf;
+			stream.avail_out = sizeof(fixed_buf);
+		}
 	} while (status == Z_OK);
 	if (stream.total_out != size || status != Z_STREAM_END)
-		bad_object(offset, "inflate returned %d", status);
+		bad_object(offset, _("inflate returned %d"), status);
 	git_inflate_end(&stream);
-	return buf;
+	if (sha1)
+		git_SHA1_Final(sha1, &c);
+	return buf == fixed_buf ? NULL : buf;
 }
 
-static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base)
+static void *unpack_raw_entry(struct object_entry *obj,
+			      union delta_base *delta_base,
+			      unsigned char *sha1)
 {
 	unsigned char *p;
 	unsigned long size, c;
@@ -339,7 +480,7 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
 		while (c & 128) {
 			base_offset += 1;
 			if (!base_offset || MSB(base_offset, 7))
-				bad_object(obj->idx.offset, "offset value overflow for delta base object");
+				bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
 			p = fill(1);
 			c = *p;
 			use(1);
@@ -347,7 +488,7 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
 		}
 		delta_base->offset = obj->idx.offset - base_offset;
 		if (delta_base->offset <= 0 || delta_base->offset >= obj->idx.offset)
-			bad_object(obj->idx.offset, "delta base offset is out of bound");
+			bad_object(obj->idx.offset, _("delta base offset is out of bound"));
 		break;
 	case OBJ_COMMIT:
 	case OBJ_TREE:
@@ -355,16 +496,18 @@ static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_
 	case OBJ_TAG:
 		break;
 	default:
-		bad_object(obj->idx.offset, "unknown object type %d", obj->type);
+		bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
 	}
 	obj->hdr_size = consumed_bytes - obj->idx.offset;
 
-	data = unpack_entry_data(obj->idx.offset, obj->size);
+	data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, sha1);
 	obj->idx.crc32 = input_crc32;
 	return data;
 }
 
-static void *get_data_from_pack(struct object_entry *obj)
+static void *unpack_data(struct object_entry *obj,
+			 int (*consume)(const unsigned char *, unsigned long, void *),
+			 void *cb_data)
 {
 	off_t from = obj[0].idx.offset + obj[0].hdr_size;
 	unsigned long len = obj[1].idx.offset - from;
@@ -372,37 +515,62 @@ static void *get_data_from_pack(struct object_entry *obj)
 	git_zstream stream;
 	int status;
 
-	data = xmalloc(obj->size);
+	data = xmalloc(consume ? 64*1024 : obj->size);
 	inbuf = xmalloc((len < 64*1024) ? len : 64*1024);
 
 	memset(&stream, 0, sizeof(stream));
 	git_inflate_init(&stream);
 	stream.next_out = data;
-	stream.avail_out = obj->size;
+	stream.avail_out = consume ? 64*1024 : obj->size;
 
 	do {
 		ssize_t n = (len < 64*1024) ? len : 64*1024;
 		n = pread(pack_fd, inbuf, n, from);
 		if (n < 0)
-			die_errno("cannot pread pack file");
+			die_errno(_("cannot pread pack file"));
 		if (!n)
-			die("premature end of pack file, %lu bytes missing", len);
+			die(Q_("premature end of pack file, %lu byte missing",
+			       "premature end of pack file, %lu bytes missing",
+			       len),
+			    len);
 		from += n;
 		len -= n;
 		stream.next_in = inbuf;
 		stream.avail_in = n;
-		status = git_inflate(&stream, 0);
+		if (!consume)
+			status = git_inflate(&stream, 0);
+		else {
+			do {
+				status = git_inflate(&stream, 0);
+				if (consume(data, stream.next_out - data, cb_data)) {
+					free(inbuf);
+					free(data);
+					return NULL;
+				}
+				stream.next_out = data;
+				stream.avail_out = 64*1024;
+			} while (status == Z_OK && stream.avail_in);
+		}
 	} while (len && status == Z_OK && !stream.avail_in);
 
 	/* This has been inflated OK when first encountered, so... */
 	if (status != Z_STREAM_END || stream.total_out != obj->size)
-		die("serious inflate inconsistency");
+		die(_("serious inflate inconsistency"));
 
 	git_inflate_end(&stream);
 	free(inbuf);
+	if (consume) {
+		free(data);
+		data = NULL;
+	}
 	return data;
 }
 
+static void *get_data_from_pack(struct object_entry *obj)
+{
+	return unpack_data(obj, NULL, NULL);
+}
+
 static int compare_delta_bases(const union delta_base *base1,
 			       const union delta_base *base2,
 			       enum object_type type1,
@@ -457,45 +625,130 @@ static void find_delta_children(const union delta_base *base,
 	*last_index = last;
 }
 
-static void sha1_object(const void *data, unsigned long size,
-			enum object_type type, unsigned char *sha1)
+struct compare_data {
+	struct object_entry *entry;
+	struct git_istream *st;
+	unsigned char *buf;
+	unsigned long buf_size;
+};
+
+static int compare_objects(const unsigned char *buf, unsigned long size,
+			   void *cb_data)
+{
+	struct compare_data *data = cb_data;
+
+	if (data->buf_size < size) {
+		free(data->buf);
+		data->buf = xmalloc(size);
+		data->buf_size = size;
+	}
+
+	while (size) {
+		ssize_t len = read_istream(data->st, data->buf, size);
+		if (len == 0)
+			die(_("SHA1 COLLISION FOUND WITH %s !"),
+			    sha1_to_hex(data->entry->idx.sha1));
+		if (len < 0)
+			die(_("unable to read %s"),
+			    sha1_to_hex(data->entry->idx.sha1));
+		if (memcmp(buf, data->buf, len))
+			die(_("SHA1 COLLISION FOUND WITH %s !"),
+			    sha1_to_hex(data->entry->idx.sha1));
+		size -= len;
+		buf += len;
+	}
+	return 0;
+}
+
+static int check_collison(struct object_entry *entry)
+{
+	struct compare_data data;
+	enum object_type type;
+	unsigned long size;
+
+	if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
+		return -1;
+
+	memset(&data, 0, sizeof(data));
+	data.entry = entry;
+	data.st = open_istream(entry->idx.sha1, &type, &size, NULL);
+	if (!data.st)
+		return -1;
+	if (size != entry->size || type != entry->type)
+		die(_("SHA1 COLLISION FOUND WITH %s !"),
+		    sha1_to_hex(entry->idx.sha1));
+	unpack_data(entry, compare_objects, &data);
+	close_istream(data.st);
+	free(data.buf);
+	return 0;
+}
+
+static void sha1_object(const void *data, struct object_entry *obj_entry,
+			unsigned long size, enum object_type type,
+			const unsigned char *sha1)
 {
-	hash_sha1_file(data, size, typename(type), sha1);
-	if (has_sha1_file(sha1)) {
+	void *new_data = NULL;
+	int collision_test_needed;
+
+	assert(data || obj_entry);
+
+	read_lock();
+	collision_test_needed = has_sha1_file(sha1);
+	read_unlock();
+
+	if (collision_test_needed && !data) {
+		read_lock();
+		if (!check_collison(obj_entry))
+			collision_test_needed = 0;
+		read_unlock();
+	}
+	if (collision_test_needed) {
 		void *has_data;
 		enum object_type has_type;
 		unsigned long has_size;
+		read_lock();
+		has_type = sha1_object_info(sha1, &has_size);
+		if (has_type != type || has_size != size)
+			die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
 		has_data = read_sha1_file(sha1, &has_type, &has_size);
+		read_unlock();
+		if (!data)
+			data = new_data = get_data_from_pack(obj_entry);
 		if (!has_data)
-			die("cannot read existing object %s", sha1_to_hex(sha1));
+			die(_("cannot read existing object %s"), sha1_to_hex(sha1));
 		if (size != has_size || type != has_type ||
 		    memcmp(data, has_data, size) != 0)
-			die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
+			die(_("SHA1 COLLISION FOUND WITH %s !"), sha1_to_hex(sha1));
 		free(has_data);
 	}
+
 	if (strict) {
+		read_lock();
 		if (type == OBJ_BLOB) {
 			struct blob *blob = lookup_blob(sha1);
 			if (blob)
 				blob->object.flags |= FLAG_CHECKED;
 			else
-				die("invalid blob object %s", sha1_to_hex(sha1));
+				die(_("invalid blob object %s"), sha1_to_hex(sha1));
 		} else {
 			struct object *obj;
 			int eaten;
 			void *buf = (void *) data;
 
+			if (!buf)
+				buf = new_data = get_data_from_pack(obj_entry);
+
 			/*
 			 * we do not need to free the memory here, as the
 			 * buf is deleted by the caller.
 			 */
 			obj = parse_object_buffer(sha1, type, size, buf, &eaten);
 			if (!obj)
-				die("invalid %s", typename(type));
+				die(_("invalid %s"), typename(type));
 			if (fsck_object(obj, 1, fsck_error_function))
-				die("Error in object");
+				die(_("Error in object"));
 			if (fsck_walk(obj, mark_link, NULL))
-				die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1));
+				die(_("Not all child objects of %s are reachable"), sha1_to_hex(obj->sha1));
 
 			if (obj->type == OBJ_TREE) {
 				struct tree *item = (struct tree *) obj;
@@ -507,12 +760,10 @@ static void sha1_object(const void *data, unsigned long size,
 			}
 			obj->flags |= FLAG_CHECKED;
 		}
+		read_unlock();
 	}
-}
 
-static int is_delta_type(enum object_type type)
-{
-	return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
+	free(new_data);
 }
 
 /*
@@ -552,7 +803,7 @@ static void *get_base_data(struct base_data *c)
 		if (!delta_nr) {
 			c->data = get_data_from_pack(obj);
 			c->size = obj->size;
-			base_cache_used += c->size;
+			get_thread_data()->base_cache_used += c->size;
 			prune_base_data(c);
 		}
 		for (; delta_nr > 0; delta_nr--) {
@@ -567,8 +818,8 @@ static void *get_base_data(struct base_data *c)
 				&c->size);
 			free(raw);
 			if (!c->data)
-				bad_object(obj->idx.offset, "failed to apply delta");
-			base_cache_used += c->size;
+				bad_object(obj->idx.offset, _("failed to apply delta"));
+			get_thread_data()->base_cache_used += c->size;
 			prune_base_data(c);
 		}
 		free(delta);
@@ -593,10 +844,14 @@ static void resolve_delta(struct object_entry *delta_obj,
 				   delta_data, delta_obj->size, &result->size);
 	free(delta_data);
 	if (!result->data)
-		bad_object(delta_obj->idx.offset, "failed to apply delta");
-	sha1_object(result->data, result->size, delta_obj->real_type,
+		bad_object(delta_obj->idx.offset, _("failed to apply delta"));
+	hash_sha1_file(result->data, result->size,
+		       typename(delta_obj->real_type), delta_obj->idx.sha1);
+	sha1_object(result->data, NULL, result->size, delta_obj->real_type,
 		    delta_obj->idx.sha1);
+	counter_lock();
 	nr_resolved_deltas++;
+	counter_unlock();
 }
 
 static struct base_data *find_unresolved_deltas_1(struct base_data *base,
@@ -682,33 +937,68 @@ static int compare_delta_entry(const void *a, const void *b)
 				   objects[delta_b->obj_no].type);
 }
 
-/* Parse all objects and return the pack content SHA1 hash */
+static void resolve_base(struct object_entry *obj)
+{
+	struct base_data *base_obj = alloc_base_data();
+	base_obj->obj = obj;
+	base_obj->data = NULL;
+	find_unresolved_deltas(base_obj);
+}
+
+#ifndef NO_PTHREADS
+static void *threaded_second_pass(void *data)
+{
+	set_thread_data(data);
+	for (;;) {
+		int i;
+		work_lock();
+		display_progress(progress, nr_resolved_deltas);
+		while (nr_dispatched < nr_objects &&
+		       is_delta_type(objects[nr_dispatched].type))
+			nr_dispatched++;
+		if (nr_dispatched >= nr_objects) {
+			work_unlock();
+			break;
+		}
+		i = nr_dispatched++;
+		work_unlock();
+
+		resolve_base(&objects[i]);
+	}
+	return NULL;
+}
+#endif
+
+/*
+ * First pass:
+ * - find locations of all objects;
+ * - calculate SHA1 of all non-delta objects;
+ * - remember base (SHA1 or offset) for all deltas.
+ */
 static void parse_pack_objects(unsigned char *sha1)
 {
-	int i;
+	int i, nr_delays = 0;
 	struct delta_entry *delta = deltas;
 	struct stat st;
 
-	/*
-	 * First pass:
-	 * - find locations of all objects;
-	 * - calculate SHA1 of all non-delta objects;
-	 * - remember base (SHA1 or offset) for all deltas.
-	 */
 	if (verbose)
 		progress = start_progress(
-				from_stdin ? "Receiving objects" : "Indexing objects",
+				from_stdin ? _("Receiving objects") : _("Indexing objects"),
 				nr_objects);
 	for (i = 0; i < nr_objects; i++) {
 		struct object_entry *obj = &objects[i];
-		void *data = unpack_raw_entry(obj, &delta->base);
+		void *data = unpack_raw_entry(obj, &delta->base, obj->idx.sha1);
 		obj->real_type = obj->type;
 		if (is_delta_type(obj->type)) {
 			nr_deltas++;
 			delta->obj_no = i;
 			delta++;
+		} else if (!data) {
+			/* large blobs, check later */
+			obj->real_type = OBJ_BAD;
+			nr_delays++;
 		} else
-			sha1_object(data, obj->size, obj->type, obj->idx.sha1);
+			sha1_object(data, NULL, obj->size, obj->type, obj->idx.sha1);
 		free(data);
 		display_progress(progress, i+1);
 	}
@@ -719,15 +1009,39 @@ static void parse_pack_objects(unsigned char *sha1)
 	flush();
 	git_SHA1_Final(sha1, &input_ctx);
 	if (hashcmp(fill(20), sha1))
-		die("pack is corrupted (SHA1 mismatch)");
+		die(_("pack is corrupted (SHA1 mismatch)"));
 	use(20);
 
 	/* If input_fd is a file, we should have reached its end now. */
 	if (fstat(input_fd, &st))
-		die_errno("cannot fstat packfile");
+		die_errno(_("cannot fstat packfile"));
 	if (S_ISREG(st.st_mode) &&
 			lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
-		die("pack has junk at the end");
+		die(_("pack has junk at the end"));
+
+	for (i = 0; i < nr_objects; i++) {
+		struct object_entry *obj = &objects[i];
+		if (obj->real_type != OBJ_BAD)
+			continue;
+		obj->real_type = obj->type;
+		sha1_object(NULL, obj, obj->size, obj->type, obj->idx.sha1);
+		nr_delays--;
+	}
+	if (nr_delays)
+		die(_("confusion beyond insanity in parse_pack_objects()"));
+}
+
+/*
+ * Second pass:
+ * - for all non-delta objects, look if it is used as a base for
+ *   deltas;
+ * - if used as a base, uncompress the object and apply all deltas,
+ *   recursively checking if the resulting object is used as a base
+ *   for some more deltas.
+ */
+static void resolve_deltas(void)
+{
+	int i;
 
 	if (!nr_deltas)
 		return;
@@ -736,29 +1050,84 @@ static void parse_pack_objects(unsigned char *sha1)
 	qsort(deltas, nr_deltas, sizeof(struct delta_entry),
 	      compare_delta_entry);
 
-	/*
-	 * Second pass:
-	 * - for all non-delta objects, look if it is used as a base for
-	 *   deltas;
-	 * - if used as a base, uncompress the object and apply all deltas,
-	 *   recursively checking if the resulting object is used as a base
-	 *   for some more deltas.
-	 */
 	if (verbose)
-		progress = start_progress("Resolving deltas", nr_deltas);
+		progress = start_progress(_("Resolving deltas"), nr_deltas);
+
+#ifndef NO_PTHREADS
+	nr_dispatched = 0;
+	if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) {
+		init_thread();
+		for (i = 0; i < nr_threads; i++) {
+			int ret = pthread_create(&thread_data[i].thread, NULL,
+						 threaded_second_pass, thread_data + i);
+			if (ret)
+				die(_("unable to create thread: %s"),
+				    strerror(ret));
+		}
+		for (i = 0; i < nr_threads; i++)
+			pthread_join(thread_data[i].thread, NULL);
+		cleanup_thread();
+		return;
+	}
+#endif
+
 	for (i = 0; i < nr_objects; i++) {
 		struct object_entry *obj = &objects[i];
-		struct base_data *base_obj = alloc_base_data();
 
 		if (is_delta_type(obj->type))
 			continue;
-		base_obj->obj = obj;
-		base_obj->data = NULL;
-		find_unresolved_deltas(base_obj);
+		resolve_base(obj);
 		display_progress(progress, nr_resolved_deltas);
 	}
 }
 
+/*
+ * Third pass:
+ * - append objects to convert thin pack to full pack if required
+ * - write the final 20-byte SHA-1
+ */
+static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved);
+static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_sha1)
+{
+	if (nr_deltas == nr_resolved_deltas) {
+		stop_progress(&progress);
+		/* Flush remaining pack final 20-byte SHA1. */
+		flush();
+		return;
+	}
+
+	if (fix_thin_pack) {
+		struct sha1file *f;
+		unsigned char read_sha1[20], tail_sha1[20];
+		char msg[48];
+		int nr_unresolved = nr_deltas - nr_resolved_deltas;
+		int nr_objects_initial = nr_objects;
+		if (nr_unresolved <= 0)
+			die(_("confusion beyond insanity"));
+		objects = xrealloc(objects,
+				   (nr_objects + nr_unresolved + 1)
+				   * sizeof(*objects));
+		f = sha1fd(output_fd, curr_pack);
+		fix_unresolved_deltas(f, nr_unresolved);
+		sprintf(msg, _("completed with %d local objects"),
+			nr_objects - nr_objects_initial);
+		stop_progress_msg(&progress, msg);
+		sha1close(f, tail_sha1, 0);
+		hashcpy(read_sha1, pack_sha1);
+		fixup_pack_header_footer(output_fd, pack_sha1,
+					 curr_pack, nr_objects,
+					 read_sha1, consumed_bytes-20);
+		if (hashcmp(read_sha1, tail_sha1) != 0)
+			die(_("Unexpected tail checksum for %s "
+			      "(disk corruption?)"), curr_pack);
+	}
+	if (nr_deltas != nr_resolved_deltas)
+		die(Q_("pack has %d unresolved delta",
+		       "pack has %d unresolved deltas",
+		       nr_deltas - nr_resolved_deltas),
+		    nr_deltas - nr_resolved_deltas);
+}
+
 static int write_compressed(struct sha1file *f, void *in, unsigned int size)
 {
 	git_zstream stream;
@@ -778,7 +1147,7 @@ static int write_compressed(struct sha1file *f, void *in, unsigned int size)
 	} while (status == Z_OK);
 
 	if (status != Z_STREAM_END)
-		die("unable to deflate appended object (%d)", status);
+		die(_("unable to deflate appended object (%d)"), status);
 	size = stream.total_out;
 	git_deflate_end(&stream);
 	return size;
@@ -857,7 +1226,7 @@ static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
 
 		if (check_sha1_signature(d->base.sha1, base_obj->data,
 				base_obj->size, typename(type)))
-			die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
+			die(_("local object %s is corrupt"), sha1_to_hex(d->base.sha1));
 		base_obj->obj = append_obj_to_pack(f, d->base.sha1,
 					base_obj->data, base_obj->size, type);
 		find_unresolved_deltas(base_obj);
@@ -881,7 +1250,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 		fsync_or_die(output_fd, curr_pack_name);
 		err = close(output_fd);
 		if (err)
-			die_errno("error while closing pack file");
+			die_errno(_("error while closing pack file"));
 	}
 
 	if (keep_msg) {
@@ -894,7 +1263,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 
 		if (keep_fd < 0) {
 			if (errno != EEXIST)
-				die_errno("cannot write keep file '%s'",
+				die_errno(_("cannot write keep file '%s'"),
 					  keep_name);
 		} else {
 			if (keep_msg_len > 0) {
@@ -902,7 +1271,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 				write_or_die(keep_fd, "\n", 1);
 			}
 			if (close(keep_fd) != 0)
-				die_errno("cannot close written keep file '%s'",
+				die_errno(_("cannot close written keep file '%s'"),
 				    keep_name);
 			report = "keep";
 		}
@@ -915,7 +1284,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 			final_pack_name = name;
 		}
 		if (move_temp_to_file(curr_pack_name, final_pack_name))
-			die("cannot store pack file");
+			die(_("cannot store pack file"));
 	} else if (from_stdin)
 		chmod(final_pack_name, 0444);
 
@@ -926,7 +1295,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 			final_index_name = name;
 		}
 		if (move_temp_to_file(curr_index_name, final_index_name))
-			die("cannot store index file");
+			die(_("cannot store index file"));
 	} else
 		chmod(final_index_name, 0444);
 
@@ -959,7 +1328,19 @@ static int git_index_pack_config(const char *k, const char *v, void *cb)
 	if (!strcmp(k, "pack.indexversion")) {
 		opts->version = git_config_int(k, v);
 		if (opts->version > 2)
-			die("bad pack.indexversion=%"PRIu32, opts->version);
+			die(_("bad pack.indexversion=%"PRIu32), opts->version);
+		return 0;
+	}
+	if (!strcmp(k, "pack.threads")) {
+		nr_threads = git_config_int(k, v);
+		if (nr_threads < 0)
+			die(_("invalid number of threads specified (%d)"),
+			    nr_threads);
+#ifdef NO_PTHREADS
+		if (nr_threads != 1)
+			warning(_("no threads support, ignoring %s"), k);
+		nr_threads = 1;
+#endif
 		return 0;
 	}
 	return git_default_config(k, v, cb);
@@ -1015,9 +1396,9 @@ static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
 	struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
 
 	if (!p)
-		die("Cannot open existing pack file '%s'", pack_name);
+		die(_("Cannot open existing pack file '%s'"), pack_name);
 	if (open_pack_index(p))
-		die("Cannot open existing pack idx file for '%s'", pack_name);
+		die(_("Cannot open existing pack idx file for '%s'"), pack_name);
 
 	/* Read the attributes from the existing idx file */
 	opts->version = p->index_version;
@@ -1064,15 +1445,18 @@ static void show_pack_info(int stat_only)
 	}
 
 	if (baseobjects)
-		printf("non delta: %d object%s\n",
-		       baseobjects, baseobjects > 1 ? "s" : "");
+		printf_ln(Q_("non delta: %d object",
+			     "non delta: %d objects",
+			     baseobjects),
+			  baseobjects);
 	for (i = 0; i < deepest_delta; i++) {
 		if (!chain_histogram[i])
 			continue;
-		printf("chain length = %d: %lu object%s\n",
-		       i + 1,
-		       chain_histogram[i],
-		       chain_histogram[i] > 1 ? "s" : "");
+		printf_ln(Q_("chain length = %d: %lu object",
+			     "chain length = %d: %lu objects",
+			     chain_histogram[i]),
+			  i + 1,
+			  chain_histogram[i]);
 	}
 }
 
@@ -1095,7 +1479,7 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	reset_pack_idx_option(&opts);
 	git_config(git_index_pack_config, &opts);
 	if (prefix && chdir(prefix))
-		die("Cannot come back to cwd");
+		die(_("Cannot come back to cwd"));
 
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
@@ -1120,6 +1504,17 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 				keep_msg = "";
 			} else if (!prefixcmp(arg, "--keep=")) {
 				keep_msg = arg + 7;
+			} else if (!prefixcmp(arg, "--threads=")) {
+				char *end;
+				nr_threads = strtoul(arg+10, &end, 0);
+				if (!arg[10] || *end || nr_threads < 0)
+					usage(index_pack_usage);
+#ifdef NO_PTHREADS
+				if (nr_threads != 1)
+					warning(_("no threads support, "
+						  "ignoring %s"), arg);
+				nr_threads = 1;
+#endif
 			} else if (!prefixcmp(arg, "--pack_header=")) {
 				struct pack_header *hdr;
 				char *c;
@@ -1128,10 +1523,10 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 				hdr->hdr_signature = htonl(PACK_SIGNATURE);
 				hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
 				if (*c != ',')
-					die("bad %s", arg);
+					die(_("bad %s"), arg);
 				hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
 				if (*c)
-					die("bad %s", arg);
+					die(_("bad %s"), arg);
 				input_len = sizeof(*hdr);
 			} else if (!strcmp(arg, "-v")) {
 				verbose = 1;
@@ -1143,11 +1538,11 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 				char *c;
 				opts.version = strtoul(arg + 16, &c, 10);
 				if (opts.version > 2)
-					die("bad %s", arg);
+					die(_("bad %s"), arg);
 				if (*c == ',')
 					opts.off32_limit = strtoul(c+1, &c, 0);
 				if (*c || opts.off32_limit & 0x80000000)
-					die("bad %s", arg);
+					die(_("bad %s"), arg);
 			} else
 				usage(index_pack_usage);
 			continue;
@@ -1161,11 +1556,11 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	if (!pack_name && !from_stdin)
 		usage(index_pack_usage);
 	if (fix_thin_pack && !from_stdin)
-		die("--fix-thin cannot be used without --stdin");
+		die(_("--fix-thin cannot be used without --stdin"));
 	if (!index_name && pack_name) {
 		int len = strlen(pack_name);
 		if (!has_extension(pack_name, ".pack"))
-			die("packfile name '%s' does not end with '.pack'",
+			die(_("packfile name '%s' does not end with '.pack'"),
 			    pack_name);
 		index_name_buf = xmalloc(len);
 		memcpy(index_name_buf, pack_name, len - 5);
@@ -1175,7 +1570,7 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	if (keep_msg && !keep_name && pack_name) {
 		int len = strlen(pack_name);
 		if (!has_extension(pack_name, ".pack"))
-			die("packfile name '%s' does not end with '.pack'",
+			die(_("packfile name '%s' does not end with '.pack'"),
 			    pack_name);
 		keep_name_buf = xmalloc(len);
 		memcpy(keep_name_buf, pack_name, len - 5);
@@ -1184,52 +1579,29 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	}
 	if (verify) {
 		if (!index_name)
-			die("--verify with no packfile name given");
+			die(_("--verify with no packfile name given"));
 		read_idx_option(&opts, index_name);
 		opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT;
 	}
 	if (strict)
 		opts.flags |= WRITE_IDX_STRICT;
 
+#ifndef NO_PTHREADS
+	if (!nr_threads) {
+		nr_threads = online_cpus();
+		/* An experiment showed that more threads does not mean faster */
+		if (nr_threads > 3)
+			nr_threads = 3;
+	}
+#endif
+
 	curr_pack = open_pack_file(pack_name);
 	parse_pack_header();
 	objects = xcalloc(nr_objects + 1, sizeof(struct object_entry));
 	deltas = xcalloc(nr_objects, sizeof(struct delta_entry));
 	parse_pack_objects(pack_sha1);
-	if (nr_deltas == nr_resolved_deltas) {
-		stop_progress(&progress);
-		/* Flush remaining pack final 20-byte SHA1. */
-		flush();
-	} else {
-		if (fix_thin_pack) {
-			struct sha1file *f;
-			unsigned char read_sha1[20], tail_sha1[20];
-			char msg[48];
-			int nr_unresolved = nr_deltas - nr_resolved_deltas;
-			int nr_objects_initial = nr_objects;
-			if (nr_unresolved <= 0)
-				die("confusion beyond insanity");
-			objects = xrealloc(objects,
-					   (nr_objects + nr_unresolved + 1)
-					   * sizeof(*objects));
-			f = sha1fd(output_fd, curr_pack);
-			fix_unresolved_deltas(f, nr_unresolved);
-			sprintf(msg, "completed with %d local objects",
-				nr_objects - nr_objects_initial);
-			stop_progress_msg(&progress, msg);
-			sha1close(f, tail_sha1, 0);
-			hashcpy(read_sha1, pack_sha1);
-			fixup_pack_header_footer(output_fd, pack_sha1,
-						 curr_pack, nr_objects,
-						 read_sha1, consumed_bytes-20);
-			if (hashcmp(read_sha1, tail_sha1) != 0)
-				die("Unexpected tail checksum for %s "
-				    "(disk corruption?)", curr_pack);
-		}
-		if (nr_deltas != nr_resolved_deltas)
-			die("pack has %d unresolved deltas",
-			    nr_deltas - nr_resolved_deltas);
-	}
+	resolve_deltas();
+	conclude_pack(fix_thin_pack, curr_pack, pack_sha1);
 	free(deltas);
 	if (strict)
 		check_objects();
diff --git a/builtin/init-db.c b/builtin/init-db.c
index 0dacb8b7..78aa3872 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -290,6 +290,7 @@ static int create_default_files(const char *template_path)
 		strcpy(path + len, "CoNfIg");
 		if (!access(path, F_OK))
 			git_config_set("core.ignorecase", "true");
+		probe_utf8_pathname_composition(path, len);
 	}
 
 	return reinit;
@@ -463,7 +464,7 @@ static int shared_callback(const struct option *opt, const char *arg, int unset)
 }
 
 static const char *const init_db_usage[] = {
-	"git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]",
+	N_("git init [-q | --quiet] [--bare] [--template=<template-directory>] [--shared[=<permissions>]] [directory]"),
 	NULL
 };
 
@@ -481,17 +482,17 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
 	const char *template_dir = NULL;
 	unsigned int flags = 0;
 	const struct option init_db_options[] = {
-		OPT_STRING(0, "template", &template_dir, "template-directory",
-				"directory from which templates will be used"),
+		OPT_STRING(0, "template", &template_dir, N_("template-directory"),
+				N_("directory from which templates will be used")),
 		OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
-				"create a bare repository", 1),
+				N_("create a bare repository"), 1),
 		{ OPTION_CALLBACK, 0, "shared", &init_shared_repository,
-			"permissions",
-			"specify that the git repository is to be shared amongst several users",
+			N_("permissions"),
+			N_("specify that the git repository is to be shared amongst several users"),
 			PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
-		OPT_BIT('q', "quiet", &flags, "be quiet", INIT_DB_QUIET),
-		OPT_STRING(0, "separate-git-dir", &real_git_dir, "gitdir",
-			   "separate git dir from working tree"),
+		OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
+		OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
+			   N_("separate git dir from working tree")),
 		OPT_END()
 	};
 
diff --git a/builtin/log.c b/builtin/log.c
index 8a47012b..09cf43e6 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -20,6 +20,8 @@
 #include "string-list.h"
 #include "parse-options.h"
 #include "branch.h"
+#include "streaming.h"
+#include "version.h"
 
 /* Set a default date-time format for git log ("log.date" config variable) */
 static const char *default_date_mode = NULL;
@@ -32,8 +34,8 @@ static const char *fmt_patch_subject_prefix = "PATCH";
 static const char *fmt_pretty;
 
 static const char * const builtin_log_usage[] = {
-	"git log [<options>] [<since>..<until>] [[--] <path>...]\n"
-	"   or: git show [options] <object>...",
+	N_("git log [<options>] [<since>..<until>] [[--] <path>...]\n")
+	N_("   or: git show [options] <object>..."),
 	NULL
 };
 
@@ -95,9 +97,9 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 	int quiet = 0, source = 0;
 
 	const struct option builtin_log_options[] = {
-		OPT_BOOLEAN(0, "quiet", &quiet, "suppress diff output"),
-		OPT_BOOLEAN(0, "source", &source, "show source"),
-		{ OPTION_CALLBACK, 0, "decorate", NULL, NULL, "decorate options",
+		OPT_BOOLEAN(0, "quiet", &quiet, N_("suppress diff output")),
+		OPT_BOOLEAN(0, "source", &source, N_("show source")),
+		{ OPTION_CALLBACK, 0, "decorate", NULL, NULL, N_("decorate options"),
 		  PARSE_OPT_OPTARG, decorate_callback},
 		OPT_END()
 	};
@@ -107,9 +109,9 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
 			     PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
 			     PARSE_OPT_KEEP_DASHDASH);
 
-	argc = setup_revisions(argc, argv, rev, opt);
 	if (quiet)
 		rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
+	argc = setup_revisions(argc, argv, rev, opt);
 
 	/* Any arguments at this point are not recognized */
 	if (argc > 1)
@@ -365,6 +367,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 	rev.simplify_history = 0;
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 	if (!rev.diffopt.output_format)
 		rev.diffopt.output_format = DIFF_FORMAT_RAW;
@@ -383,8 +386,13 @@ static void show_tagger(char *buf, int len, struct rev_info *rev)
 	strbuf_release(&out);
 }
 
-static int show_object(const unsigned char *sha1, int show_tag_object,
-	struct rev_info *rev)
+static int show_blob_object(const unsigned char *sha1, struct rev_info *rev)
+{
+	fflush(stdout);
+	return stream_blob_to_fd(1, sha1, NULL, 0);
+}
+
+static int show_tag_object(const unsigned char *sha1, struct rev_info *rev)
 {
 	unsigned long size;
 	enum object_type type;
@@ -394,16 +402,16 @@ static int show_object(const unsigned char *sha1, int show_tag_object,
 	if (!buf)
 		return error(_("Could not read object %s"), sha1_to_hex(sha1));
 
-	if (show_tag_object)
-		while (offset < size && buf[offset] != '\n') {
-			int new_offset = offset + 1;
-			while (new_offset < size && buf[new_offset++] != '\n')
-				; /* do nothing */
-			if (!prefixcmp(buf + offset, "tagger "))
-				show_tagger(buf + offset + 7,
-					    new_offset - offset - 7, rev);
-			offset = new_offset;
-		}
+	assert(type == OBJ_TAG);
+	while (offset < size && buf[offset] != '\n') {
+		int new_offset = offset + 1;
+		while (new_offset < size && buf[new_offset++] != '\n')
+			; /* do nothing */
+		if (!prefixcmp(buf + offset, "tagger "))
+			show_tagger(buf + offset + 7,
+				    new_offset - offset - 7, rev);
+		offset = new_offset;
+	}
 
 	if (offset < size)
 		fwrite(buf + offset, size - offset, 1, stdout);
@@ -448,7 +456,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	init_revisions(&rev, prefix);
 	rev.diff = 1;
 	rev.always_show_header = 1;
-	rev.no_walk = 1;
+	rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
 	rev.diffopt.stat_width = -1; 	/* Scale to real terminal size */
 
 	memset(&opt, 0, sizeof(opt));
@@ -456,6 +464,9 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	opt.tweak = show_rev_tweak_rev;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 
+	if (!rev.no_walk)
+		return cmd_log_walk(&rev);
+
 	count = rev.pending.nr;
 	objects = rev.pending.objects;
 	for (i = 0; i < count && !ret; i++) {
@@ -463,7 +474,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 		const char *name = objects[i].name;
 		switch (o->type) {
 		case OBJ_BLOB:
-			ret = show_object(o->sha1, 0, NULL);
+			ret = show_blob_object(o->sha1, NULL);
 			break;
 		case OBJ_TAG: {
 			struct tag *t = (struct tag *)o;
@@ -474,7 +485,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 					diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
 					t->tag,
 					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
-			ret = show_object(o->sha1, 1, &rev);
+			ret = show_tag_object(o->sha1, &rev);
 			rev.shown_one = 1;
 			if (ret)
 				break;
@@ -547,6 +558,7 @@ int cmd_log(int argc, const char **argv, const char *prefix)
 	rev.always_show_header = 1;
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 	return cmd_log_walk(&rev);
 }
@@ -657,7 +669,8 @@ static FILE *realstdout = NULL;
 static const char *output_directory = NULL;
 static int outdir_offset;
 
-static int reopen_stdout(struct commit *commit, struct rev_info *rev, int quiet)
+static int reopen_stdout(struct commit *commit, const char *subject,
+			 struct rev_info *rev, int quiet)
 {
 	struct strbuf filename = STRBUF_INIT;
 	int suffix_len = strlen(fmt_patch_suffix) + 1;
@@ -671,7 +684,7 @@ static int reopen_stdout(struct commit *commit, struct rev_info *rev, int quiet)
 			strbuf_addch(&filename, '/');
 	}
 
-	get_patch_filename(commit, rev->nr, fmt_patch_suffix, &filename);
+	get_patch_filename(commit, subject, rev->nr, fmt_patch_suffix, &filename);
 
 	if (!quiet)
 		fprintf(realstdout, "%s\n", filename.buf + outdir_offset);
@@ -683,7 +696,7 @@ static int reopen_stdout(struct commit *commit, struct rev_info *rev, int quiet)
 	return 0;
 }
 
-static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
+static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
 {
 	struct rev_info check_rev;
 	struct commit *commit;
@@ -704,7 +717,8 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const cha
 	init_patch_ids(ids);
 
 	/* given a range a..b get all patch ids for b..a */
-	init_revisions(&check_rev, prefix);
+	init_revisions(&check_rev, rev->prefix);
+	check_rev.max_parents = 1;
 	o1->flags ^= UNINTERESTING;
 	o2->flags ^= UNINTERESTING;
 	add_pending_object(&check_rev, o1, "o1");
@@ -713,10 +727,6 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const cha
 		die(_("revision walk setup failed"));
 
 	while ((commit = get_revision(&check_rev)) != NULL) {
-		/* ignore merges */
-		if (commit->parents && commit->parents->next)
-			continue;
-
 		add_commit_patch_id(commit, ids);
 	}
 
@@ -731,15 +741,10 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const cha
 
 static void gen_message_id(struct rev_info *info, char *base)
 {
-	const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
-	const char *email_start = strrchr(committer, '<');
-	const char *email_end = strrchr(committer, '>');
 	struct strbuf buf = STRBUF_INIT;
-	if (!email_start || !email_end || email_start > email_end - 1)
-		die(_("Could not extract email from committer identity."));
-	strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
+	strbuf_addf(&buf, "%s.%lu.git.%s", base,
 		    (unsigned long) time(NULL),
-		    (int)(email_end - email_start - 1), email_start + 1);
+		    git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
 	info->message_id = strbuf_detach(&buf, NULL);
 }
 
@@ -778,7 +783,6 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 	const char *encoding = "UTF-8";
 	struct diff_options opts;
 	int need_8bit_cte = 0;
-	struct commit *commit = NULL;
 	struct pretty_print_context pp = {0};
 
 	if (rev->commit_format != CMIT_FMT_EMAIL)
@@ -786,31 +790,10 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 
 	committer = git_committer_info(0);
 
-	if (!numbered_files) {
-		/*
-		 * We fake a commit for the cover letter so we get the filename
-		 * desired.
-		 */
-		commit = xcalloc(1, sizeof(*commit));
-		commit->buffer = xmalloc(400);
-		snprintf(commit->buffer, 400,
-			"tree 0000000000000000000000000000000000000000\n"
-			"parent %s\n"
-			"author %s\n"
-			"committer %s\n\n"
-			"cover letter\n",
-			sha1_to_hex(head->object.sha1), committer, committer);
-	}
-
-	if (!use_stdout && reopen_stdout(commit, rev, quiet))
+	if (!use_stdout &&
+	    reopen_stdout(NULL, numbered_files ? NULL : "cover-letter", rev, quiet))
 		return;
 
-	if (commit) {
-
-		free(commit->buffer);
-		free(commit);
-	}
-
 	log_write_email_headers(rev, head, &pp.subject, &pp.after_subject,
 				&need_8bit_cte);
 
@@ -904,7 +887,7 @@ static const char *set_outdir(const char *prefix, const char *output_directory)
 }
 
 static const char * const builtin_format_patch_usage[] = {
-	"git format-patch [options] [<since> | <revision range>]",
+	N_("git format-patch [options] [<since> | <revision range>]"),
 	NULL
 };
 
@@ -1077,61 +1060,61 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	char *branch_name = NULL;
 	const struct option builtin_format_patch_options[] = {
 		{ OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
-			    "use [PATCH n/m] even with a single patch",
+			    N_("use [PATCH n/m] even with a single patch"),
 			    PARSE_OPT_NOARG, numbered_callback },
 		{ OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
-			    "use [PATCH] even with multiple patches",
+			    N_("use [PATCH] even with multiple patches"),
 			    PARSE_OPT_NOARG, no_numbered_callback },
-		OPT_BOOLEAN('s', "signoff", &do_signoff, "add Signed-off-by:"),
+		OPT_BOOLEAN('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
 		OPT_BOOLEAN(0, "stdout", &use_stdout,
-			    "print patches to standard out"),
+			    N_("print patches to standard out")),
 		OPT_BOOLEAN(0, "cover-letter", &cover_letter,
-			    "generate a cover letter"),
+			    N_("generate a cover letter")),
 		OPT_BOOLEAN(0, "numbered-files", &numbered_files,
-			    "use simple number sequence for output file names"),
-		OPT_STRING(0, "suffix", &fmt_patch_suffix, "sfx",
-			    "use <sfx> instead of '.patch'"),
+			    N_("use simple number sequence for output file names")),
+		OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
+			    N_("use <sfx> instead of '.patch'")),
 		OPT_INTEGER(0, "start-number", &start_number,
-			    "start numbering patches at <n> instead of 1"),
-		{ OPTION_CALLBACK, 0, "subject-prefix", &rev, "prefix",
-			    "Use [<prefix>] instead of [PATCH]",
+			    N_("start numbering patches at <n> instead of 1")),
+		{ OPTION_CALLBACK, 0, "subject-prefix", &rev, N_("prefix"),
+			    N_("Use [<prefix>] instead of [PATCH]"),
 			    PARSE_OPT_NONEG, subject_prefix_callback },
 		{ OPTION_CALLBACK, 'o', "output-directory", &output_directory,
-			    "dir", "store resulting files in <dir>",
+			    N_("dir"), N_("store resulting files in <dir>"),
 			    PARSE_OPT_NONEG, output_directory_callback },
 		{ OPTION_CALLBACK, 'k', "keep-subject", &rev, NULL,
-			    "don't strip/add [PATCH]",
+			    N_("don't strip/add [PATCH]"),
 			    PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback },
 		OPT_BOOLEAN(0, "no-binary", &no_binary_diff,
-			    "don't output binary diffs"),
+			    N_("don't output binary diffs")),
 		OPT_BOOLEAN(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
-			    "don't include a patch matching a commit upstream"),
+			    N_("don't include a patch matching a commit upstream")),
 		{ OPTION_BOOLEAN, 'p', "no-stat", &use_patch_format, NULL,
-		  "show patch format instead of default (patch + stat)",
+		  N_("show patch format instead of default (patch + stat)"),
 		  PARSE_OPT_NONEG | PARSE_OPT_NOARG },
-		OPT_GROUP("Messaging"),
-		{ OPTION_CALLBACK, 0, "add-header", NULL, "header",
-			    "add email header", 0, header_callback },
-		{ OPTION_CALLBACK, 0, "to", NULL, "email", "add To: header",
+		OPT_GROUP(N_("Messaging")),
+		{ OPTION_CALLBACK, 0, "add-header", NULL, N_("header"),
+			    N_("add email header"), 0, header_callback },
+		{ OPTION_CALLBACK, 0, "to", NULL, N_("email"), N_("add To: header"),
 			    0, to_callback },
-		{ OPTION_CALLBACK, 0, "cc", NULL, "email", "add Cc: header",
+		{ OPTION_CALLBACK, 0, "cc", NULL, N_("email"), N_("add Cc: header"),
 			    0, cc_callback },
-		OPT_STRING(0, "in-reply-to", &in_reply_to, "message-id",
-			    "make first mail a reply to <message-id>"),
-		{ OPTION_CALLBACK, 0, "attach", &rev, "boundary",
-			    "attach the patch", PARSE_OPT_OPTARG,
+		OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
+			    N_("make first mail a reply to <message-id>")),
+		{ OPTION_CALLBACK, 0, "attach", &rev, N_("boundary"),
+			    N_("attach the patch"), PARSE_OPT_OPTARG,
 			    attach_callback },
-		{ OPTION_CALLBACK, 0, "inline", &rev, "boundary",
-			    "inline the patch",
+		{ OPTION_CALLBACK, 0, "inline", &rev, N_("boundary"),
+			    N_("inline the patch"),
 			    PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 			    inline_callback },
-		{ OPTION_CALLBACK, 0, "thread", &thread, "style",
-			    "enable message threading, styles: shallow, deep",
+		{ OPTION_CALLBACK, 0, "thread", &thread, N_("style"),
+			    N_("enable message threading, styles: shallow, deep"),
 			    PARSE_OPT_OPTARG, thread_callback },
-		OPT_STRING(0, "signature", &signature, "signature",
-			    "add a signature"),
+		OPT_STRING(0, "signature", &signature, N_("signature"),
+			    N_("add a signature")),
 		OPT_BOOLEAN(0, "quiet", &quiet,
-			    "don't print the patch filenames"),
+			    N_("don't print the patch filenames")),
 		OPT_END()
 	};
 
@@ -1148,6 +1131,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	rev.subject_prefix = fmt_patch_subject_prefix;
 	memset(&s_r_opt, 0, sizeof(s_r_opt));
 	s_r_opt.def = "HEAD";
+	s_r_opt.revarg_opt = REVARG_COMMITTISH;
 
 	if (default_attach) {
 		rev.mime_boundary = default_attach;
@@ -1167,7 +1151,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	if (do_signoff) {
 		const char *committer;
 		const char *endpos;
-		committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
+		committer = git_committer_info(IDENT_STRICT);
 		endpos = strchr(committer, '>');
 		if (!endpos)
 			die(_("bogus committer info %s"), committer);
@@ -1319,7 +1303,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 			if (hashcmp(o[0].item->sha1, o[1].item->sha1) == 0)
 				return 0;
 		}
-		get_patch_ids(&rev, &ids, prefix);
+		get_patch_ids(&rev, &ids);
 	}
 
 	if (!use_stdout)
@@ -1405,8 +1389,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 			gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
 		}
 
-		if (!use_stdout && reopen_stdout(numbered_files ? NULL : commit,
-						 &rev, quiet))
+		if (!use_stdout &&
+		    reopen_stdout(numbered_files ? NULL : commit, NULL, &rev, quiet))
 			die(_("Failed to create output files"));
 		shown = log_tree_commit(&rev, commit);
 		free(commit->buffer);
@@ -1456,7 +1440,7 @@ static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
 }
 
 static const char * const cherry_usage[] = {
-	"git cherry [-v] [<upstream> [<head> [<limit>]]]",
+	N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
 	NULL
 };
 
@@ -1490,7 +1474,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 
 	struct option options[] = {
 		OPT__ABBREV(&abbrev),
-		OPT__VERBOSE(&verbose, "be verbose"),
+		OPT__VERBOSE(&verbose, N_("be verbose")),
 		OPT_END()
 	};
 
@@ -1521,10 +1505,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 	}
 
 	init_revisions(&revs, prefix);
-	revs.diff = 1;
-	revs.combine_merges = 0;
-	revs.ignore_merges = 1;
-	DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
+	revs.max_parents = 1;
 
 	if (add_pending_commit(head, &revs, 0))
 		die(_("Unknown commit %s"), head);
@@ -1538,7 +1519,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 			return 0;
 	}
 
-	get_patch_ids(&revs, &ids, prefix);
+	get_patch_ids(&revs, &ids);
 
 	if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
 		die(_("Unknown commit %s"), limit);
@@ -1547,10 +1528,6 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
 	if (prepare_revision_walk(&revs))
 		die(_("revision walk setup failed"));
 	while ((commit = get_revision(&revs)) != NULL) {
-		/* ignore merges */
-		if (commit->parents && commit->parents->next)
-			continue;
-
 		commit_list_insert(commit, &list);
 	}
 
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 7cff1757..b5434af0 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -200,9 +200,19 @@ static void show_ru_info(void)
 	}
 }
 
+static int ce_excluded(struct path_exclude_check *check, struct cache_entry *ce)
+{
+	int dtype = ce_to_dtype(ce);
+	return path_excluded(check, ce->name, ce_namelen(ce), &dtype);
+}
+
 static void show_files(struct dir_struct *dir)
 {
 	int i;
+	struct path_exclude_check check;
+
+	if ((dir->flags & DIR_SHOW_IGNORED))
+		path_exclude_check_init(&check, dir);
 
 	/* For cached/deleted files we don't need to even do the readdir */
 	if (show_others || show_killed) {
@@ -215,9 +225,8 @@ static void show_files(struct dir_struct *dir)
 	if (show_cached | show_stage) {
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
-			int dtype = ce_to_dtype(ce);
-			if (dir->flags & DIR_SHOW_IGNORED &&
-			    !excluded(dir, ce->name, &dtype))
+			if ((dir->flags & DIR_SHOW_IGNORED) &&
+			    !ce_excluded(&check, ce))
 				continue;
 			if (show_unmerged && !ce_stage(ce))
 				continue;
@@ -232,9 +241,8 @@ static void show_files(struct dir_struct *dir)
 			struct cache_entry *ce = active_cache[i];
 			struct stat st;
 			int err;
-			int dtype = ce_to_dtype(ce);
-			if (dir->flags & DIR_SHOW_IGNORED &&
-			    !excluded(dir, ce->name, &dtype))
+			if ((dir->flags & DIR_SHOW_IGNORED) &&
+			    !ce_excluded(&check, ce))
 				continue;
 			if (ce->ce_flags & CE_UPDATE)
 				continue;
@@ -247,6 +255,9 @@ static void show_files(struct dir_struct *dir)
 				show_ce_entry(tag_modified, ce);
 		}
 	}
+
+	if ((dir->flags & DIR_SHOW_IGNORED))
+		path_exclude_check_clear(&check);
 }
 
 /*
@@ -394,7 +405,7 @@ int report_path_error(const char *ps_matched, const char **pathspec, const char
 }
 
 static const char * const ls_files_usage[] = {
-	"git ls-files [options] [<file>...]",
+	N_("git ls-files [options] [<file>...]"),
 	NULL
 };
 
@@ -446,57 +457,57 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
 	struct dir_struct dir;
 	struct option builtin_ls_files_options[] = {
 		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
-			"paths are separated with NUL character",
+			N_("paths are separated with NUL character"),
 			PARSE_OPT_NOARG, option_parse_z },
 		OPT_BOOLEAN('t', NULL, &show_tag,
-			"identify the file status with tags"),
+			N_("identify the file status with tags")),
 		OPT_BOOLEAN('v', NULL, &show_valid_bit,
-			"use lowercase letters for 'assume unchanged' files"),
+			N_("use lowercase letters for 'assume unchanged' files")),
 		OPT_BOOLEAN('c', "cached", &show_cached,
-			"show cached files in the output (default)"),
+			N_("show cached files in the output (default)")),
 		OPT_BOOLEAN('d', "deleted", &show_deleted,
-			"show deleted files in the output"),
+			N_("show deleted files in the output")),
 		OPT_BOOLEAN('m', "modified", &show_modified,
-			"show modified files in the output"),
+			N_("show modified files in the output")),
 		OPT_BOOLEAN('o', "others", &show_others,
-			"show other files in the output"),
+			N_("show other files in the output")),
 		OPT_BIT('i', "ignored", &dir.flags,
-			"show ignored files in the output",
+			N_("show ignored files in the output"),
 			DIR_SHOW_IGNORED),
 		OPT_BOOLEAN('s', "stage", &show_stage,
-			"show staged contents' object name in the output"),
+			N_("show staged contents' object name in the output")),
 		OPT_BOOLEAN('k', "killed", &show_killed,
-			"show files on the filesystem that need to be removed"),
+			N_("show files on the filesystem that need to be removed")),
 		OPT_BIT(0, "directory", &dir.flags,
-			"show 'other' directories' name only",
+			N_("show 'other' directories' name only"),
 			DIR_SHOW_OTHER_DIRECTORIES),
 		OPT_NEGBIT(0, "empty-directory", &dir.flags,
-			"don't show empty directories",
+			N_("don't show empty directories"),
 			DIR_HIDE_EMPTY_DIRECTORIES),
 		OPT_BOOLEAN('u', "unmerged", &show_unmerged,
-			"show unmerged files in the output"),
+			N_("show unmerged files in the output")),
 		OPT_BOOLEAN(0, "resolve-undo", &show_resolve_undo,
-			    "show resolve-undo information"),
-		{ OPTION_CALLBACK, 'x', "exclude", &dir.exclude_list[EXC_CMDL], "pattern",
-			"skip files matching pattern",
+			    N_("show resolve-undo information")),
+		{ OPTION_CALLBACK, 'x', "exclude", &dir.exclude_list[EXC_CMDL], N_("pattern"),
+			N_("skip files matching pattern"),
 			0, option_parse_exclude },
-		{ OPTION_CALLBACK, 'X', "exclude-from", &dir, "file",
-			"exclude patterns are read from <file>",
+		{ OPTION_CALLBACK, 'X', "exclude-from", &dir, N_("file"),
+			N_("exclude patterns are read from <file>"),
 			0, option_parse_exclude_from },
-		OPT_STRING(0, "exclude-per-directory", &dir.exclude_per_dir, "file",
-			"read additional per-directory exclude patterns in <file>"),
+		OPT_STRING(0, "exclude-per-directory", &dir.exclude_per_dir, N_("file"),
+			N_("read additional per-directory exclude patterns in <file>")),
 		{ OPTION_CALLBACK, 0, "exclude-standard", &dir, NULL,
-			"add the standard git exclusions",
+			N_("add the standard git exclusions"),
 			PARSE_OPT_NOARG, option_parse_exclude_standard },
 		{ OPTION_SET_INT, 0, "full-name", &prefix_len, NULL,
-			"make the output relative to the project top directory",
+			N_("make the output relative to the project top directory"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL },
 		OPT_BOOLEAN(0, "error-unmatch", &error_unmatch,
-			"if any <file> is not in the index, treat this as an error"),
-		OPT_STRING(0, "with-tree", &with_tree, "tree-ish",
-			"pretend that paths removed since <tree-ish> are still present"),
+			N_("if any <file> is not in the index, treat this as an error")),
+		OPT_STRING(0, "with-tree", &with_tree, N_("tree-ish"),
+			N_("pretend that paths removed since <tree-ish> are still present")),
 		OPT__ABBREV(&abbrev),
-		OPT_BOOLEAN(0, "debug", &debug_mode, "show debugging data"),
+		OPT_BOOLEAN(0, "debug", &debug_mode, N_("show debugging data")),
 		OPT_END()
 	};
 
diff --git a/builtin/ls-remote.c b/builtin/ls-remote.c
index 41c88a98..25e83cfe 100644
--- a/builtin/ls-remote.c
+++ b/builtin/ls-remote.c
@@ -5,7 +5,7 @@
 
 static const char ls_remote_usage[] =
 "git ls-remote [--heads] [--tags]  [-u <exec> | --upload-pack <exec>]\n"
-"                     [-q|--quiet] [--exit-code] [<repository> [<refs>...]]";
+"                     [-q|--quiet] [--exit-code] [--get-url] [<repository> [<refs>...]]";
 
 /*
  * Is there one among the list of patterns that match the tail part
diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
index 6b666e1e..235c17cc 100644
--- a/builtin/ls-tree.c
+++ b/builtin/ls-tree.c
@@ -24,7 +24,7 @@ static int chomp_prefix;
 static const char *ls_tree_prefix;
 
 static const  char * const ls_tree_usage[] = {
-	"git ls-tree [<options>] <tree-ish> [<path>...]",
+	N_("git ls-tree [<options>] <tree-ish> [<path>...]"),
 	NULL
 };
 
@@ -122,25 +122,25 @@ int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 	struct tree *tree;
 	int i, full_tree = 0;
 	const struct option ls_tree_options[] = {
-		OPT_BIT('d', NULL, &ls_options, "only show trees",
+		OPT_BIT('d', NULL, &ls_options, N_("only show trees"),
 			LS_TREE_ONLY),
-		OPT_BIT('r', NULL, &ls_options, "recurse into subtrees",
+		OPT_BIT('r', NULL, &ls_options, N_("recurse into subtrees"),
 			LS_RECURSIVE),
-		OPT_BIT('t', NULL, &ls_options, "show trees when recursing",
+		OPT_BIT('t', NULL, &ls_options, N_("show trees when recursing"),
 			LS_SHOW_TREES),
 		OPT_SET_INT('z', NULL, &line_termination,
-			    "terminate entries with NUL byte", 0),
-		OPT_BIT('l', "long", &ls_options, "include object size",
+			    N_("terminate entries with NUL byte"), 0),
+		OPT_BIT('l', "long", &ls_options, N_("include object size"),
 			LS_SHOW_SIZE),
-		OPT_BIT(0, "name-only", &ls_options, "list only filenames",
+		OPT_BIT(0, "name-only", &ls_options, N_("list only filenames"),
 			LS_NAME_ONLY),
-		OPT_BIT(0, "name-status", &ls_options, "list only filenames",
+		OPT_BIT(0, "name-status", &ls_options, N_("list only filenames"),
 			LS_NAME_ONLY),
 		OPT_SET_INT(0, "full-name", &chomp_prefix,
-			    "use full path names", 0),
+			    N_("use full path names"), 0),
 		OPT_BOOLEAN(0, "full-tree", &full_tree,
-			    "list entire tree; not just current directory "
-			    "(implies --full-name)"),
+			    N_("list entire tree; not just current directory "
+			       "(implies --full-name)")),
 		OPT__ABBREV(&abbrev),
 		OPT_END()
 	};
diff --git a/builtin/mailinfo.c b/builtin/mailinfo.c
index eaf9e157..da231400 100644
--- a/builtin/mailinfo.c
+++ b/builtin/mailinfo.c
@@ -19,9 +19,6 @@ static struct strbuf email = STRBUF_INIT;
 static enum  {
 	TE_DONTCARE, TE_QP, TE_BASE64
 } transfer_encoding;
-static enum  {
-	TYPE_TEXT, TYPE_OTHER
-} message_type;
 
 static struct strbuf charset = STRBUF_INIT;
 static int patch_lines;
@@ -160,10 +157,9 @@ static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
 	const char *ends, *ap = strcasestr(line, name);
 	size_t sz;
 
-	if (!ap) {
-		strbuf_setlen(attr, 0);
+	strbuf_setlen(attr, 0);
+	if (!ap)
 		return 0;
-	}
 	ap += strlen(name);
 	if (*ap == '"') {
 		ap++;
@@ -185,8 +181,6 @@ static void handle_content_type(struct strbuf *line)
 	struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
 	strbuf_init(boundary, line->len);
 
-	if (!strcasestr(line->buf, "text/"))
-		 message_type = TYPE_OTHER;
 	if (slurp_attr(line->buf, "boundary=", boundary)) {
 		strbuf_insert(boundary, 0, "--", 2);
 		if (++content_top > &content[MAX_BOUNDARIES]) {
@@ -232,7 +226,9 @@ static void cleanup_subject(struct strbuf *subject)
 		case 'r': case 'R':
 			if (subject->len <= at + 3)
 				break;
-			if (!memcmp(subject->buf + at + 1, "e:", 2)) {
+			if ((subject->buf[at + 1] == 'e' ||
+			     subject->buf[at + 1] == 'E') &&
+			    subject->buf[at + 2] == ':') {
 				strbuf_remove(subject, at, 3);
 				continue;
 			}
@@ -481,36 +477,12 @@ static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
 	return out;
 }
 
-/*
- * When there is no known charset, guess.
- *
- * Right now we assume that if the target is UTF-8 (the default),
- * and it already looks like UTF-8 (which includes US-ASCII as its
- * subset, of course) then that is what it is and there is nothing
- * to do.
- *
- * Otherwise, we default to assuming it is Latin1 for historical
- * reasons.
- */
-static const char *guess_charset(const struct strbuf *line, const char *target_charset)
-{
-	if (is_encoding_utf8(target_charset)) {
-		if (is_utf8(line->buf))
-			return NULL;
-	}
-	return "ISO8859-1";
-}
-
 static void convert_to_utf8(struct strbuf *line, const char *charset)
 {
 	char *out;
 
-	if (!charset || !*charset) {
-		charset = guess_charset(line, metainfo_charset);
-		if (!charset)
-			return;
-	}
-
+	if (!charset || !*charset)
+		return;
 	if (!strcasecmp(metainfo_charset, charset))
 		return;
 	out = reencode_string(line->buf, metainfo_charset, charset);
@@ -680,7 +652,6 @@ again:
 	/* set some defaults */
 	transfer_encoding = TE_DONTCARE;
 	strbuf_reset(&charset);
-	message_type = TYPE_TEXT;
 
 	/* slurp in this section's info */
 	while (read_one_header_line(&line, fin))
@@ -894,11 +865,6 @@ static void handle_body(void)
 			strbuf_insert(&line, 0, prev.buf, prev.len);
 			strbuf_reset(&prev);
 
-			/* binary data most likely doesn't have newlines */
-			if (message_type != TYPE_TEXT) {
-				handle_filter(&line);
-				break;
-			}
 			/*
 			 * This is a decoded line that may contain
 			 * multiple new lines.  Pass only one chunk
diff --git a/builtin/merge-base.c b/builtin/merge-base.c
index 4f30f1b0..1bc79910 100644
--- a/builtin/merge-base.c
+++ b/builtin/merge-base.c
@@ -23,9 +23,10 @@ static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
 }
 
 static const char * const merge_base_usage[] = {
-	"git merge-base [-a|--all] <commit> <commit>...",
-	"git merge-base [-a|--all] --octopus <commit>...",
-	"git merge-base --independent <commit>...",
+	N_("git merge-base [-a|--all] <commit> <commit>..."),
+	N_("git merge-base [-a|--all] --octopus <commit>..."),
+	N_("git merge-base --independent <commit>..."),
+	N_("git merge-base --is-ancestor <commit> <commit>"),
 	NULL
 };
 
@@ -70,6 +71,20 @@ static int handle_octopus(int count, const char **args, int reduce, int show_all
 	return 0;
 }
 
+static int handle_is_ancestor(int argc, const char **argv)
+{
+	struct commit *one, *two;
+
+	if (argc != 2)
+		die("--is-ancestor takes exactly two commits");
+	one = get_commit_reference(argv[0]);
+	two = get_commit_reference(argv[1]);
+	if (in_merge_bases(one, two))
+		return 0;
+	else
+		return 1;
+}
+
 int cmd_merge_base(int argc, const char **argv, const char *prefix)
 {
 	struct commit **rev;
@@ -77,11 +92,14 @@ int cmd_merge_base(int argc, const char **argv, const char *prefix)
 	int show_all = 0;
 	int octopus = 0;
 	int reduce = 0;
+	int is_ancestor = 0;
 
 	struct option options[] = {
-		OPT_BOOLEAN('a', "all", &show_all, "output all common ancestors"),
-		OPT_BOOLEAN(0, "octopus", &octopus, "find ancestors for a single n-way merge"),
-		OPT_BOOLEAN(0, "independent", &reduce, "list revs not reachable from others"),
+		OPT_BOOLEAN('a', "all", &show_all, N_("output all common ancestors")),
+		OPT_BOOLEAN(0, "octopus", &octopus, N_("find ancestors for a single n-way merge")),
+		OPT_BOOLEAN(0, "independent", &reduce, N_("list revs not reachable from others")),
+		OPT_BOOLEAN(0, "is-ancestor", &is_ancestor,
+			    N_("is the first one ancestor of the other?")),
 		OPT_END()
 	};
 
@@ -89,6 +107,10 @@ int cmd_merge_base(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
 	if (!octopus && !reduce && argc < 2)
 		usage_with_options(merge_base_usage, options);
+	if (is_ancestor && (show_all | octopus | reduce))
+		die("--is-ancestor cannot be used with other options");
+	if (is_ancestor)
+		return handle_is_ancestor(argc, argv);
 	if (reduce && (show_all || octopus))
 		die("--independent cannot be used with other options");
 
diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index 237abd3c..c0570f24 100644
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -5,7 +5,7 @@
 #include "parse-options.h"
 
 static const char *const merge_file_usage[] = {
-	"git merge-file [options] [-L name1 [-L orig [-L name2]]] file1 orig_file file2",
+	N_("git merge-file [options] [-L name1 [-L orig [-L name2]]] file1 orig_file file2"),
 	NULL
 };
 
@@ -30,19 +30,19 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 	int quiet = 0;
 	int prefixlen = 0;
 	struct option options[] = {
-		OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
-		OPT_SET_INT(0, "diff3", &xmp.style, "use a diff3 based merge", XDL_MERGE_DIFF3),
-		OPT_SET_INT(0, "ours", &xmp.favor, "for conflicts, use our version",
+		OPT_BOOLEAN('p', "stdout", &to_stdout, N_("send results to standard output")),
+		OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
+		OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
 			    XDL_MERGE_FAVOR_OURS),
-		OPT_SET_INT(0, "theirs", &xmp.favor, "for conflicts, use their version",
+		OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
 			    XDL_MERGE_FAVOR_THEIRS),
-		OPT_SET_INT(0, "union", &xmp.favor, "for conflicts, use a union version",
+		OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
 			    XDL_MERGE_FAVOR_UNION),
 		OPT_INTEGER(0, "marker-size", &xmp.marker_size,
-			    "for conflicts, use this marker size"),
-		OPT__QUIET(&quiet, "do not warn about conflicts"),
-		OPT_CALLBACK('L', NULL, names, "name",
-			     "set labels for file1/orig_file/file2", &label_cb),
+			    N_("for conflicts, use this marker size")),
+		OPT__QUIET(&quiet, N_("do not warn about conflicts")),
+		OPT_CALLBACK('L', NULL, names, N_("name"),
+			     N_("set labels for file1/orig_file/file2"), &label_cb),
 		OPT_END(),
 	};
 
@@ -63,7 +63,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 	if (quiet) {
 		if (!freopen("/dev/null", "w", stderr))
 			return error("failed to redirect stderr to /dev/null: "
-				     "%s\n", strerror(errno));
+				     "%s", strerror(errno));
 	}
 
 	if (prefix)
@@ -76,7 +76,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
 		if (read_mmfile(mmfs + i, fname))
 			return -1;
 		if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
-			return error("Cannot merge binary files: %s\n",
+			return error("Cannot merge binary files: %s",
 					argv[i]);
 	}
 
diff --git a/builtin/merge.c b/builtin/merge.c
index 470fc57c..0ec8f0d4 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -40,9 +40,9 @@ struct strategy {
 };
 
 static const char * const builtin_merge_usage[] = {
-	"git merge [options] [<commit>...]",
-	"git merge [options] <msg> HEAD <commit>",
-	"git merge --abort",
+	N_("git merge [options] [<commit>...]"),
+	N_("git merge [options] <msg> HEAD <commit>"),
+	N_("git merge --abort"),
 	NULL
 };
 
@@ -180,39 +180,39 @@ static int option_parse_n(const struct option *opt,
 
 static struct option builtin_merge_options[] = {
 	{ OPTION_CALLBACK, 'n', NULL, NULL, NULL,
-		"do not show a diffstat at the end of the merge",
+		N_("do not show a diffstat at the end of the merge"),
 		PARSE_OPT_NOARG, option_parse_n },
 	OPT_BOOLEAN(0, "stat", &show_diffstat,
-		"show a diffstat at the end of the merge"),
-	OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"),
-	{ OPTION_INTEGER, 0, "log", &shortlog_len, "n",
-	  "add (at most <n>) entries from shortlog to merge commit message",
+		N_("show a diffstat at the end of the merge")),
+	OPT_BOOLEAN(0, "summary", &show_diffstat, N_("(synonym to --stat)")),
+	{ OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
+	  N_("add (at most <n>) entries from shortlog to merge commit message"),
 	  PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
 	OPT_BOOLEAN(0, "squash", &squash,
-		"create a single commit instead of doing a merge"),
+		N_("create a single commit instead of doing a merge")),
 	OPT_BOOLEAN(0, "commit", &option_commit,
-		"perform a commit if the merge succeeds (default)"),
+		N_("perform a commit if the merge succeeds (default)")),
 	OPT_BOOL('e', "edit", &option_edit,
-		"edit message before committing"),
+		N_("edit message before committing")),
 	OPT_BOOLEAN(0, "ff", &allow_fast_forward,
-		"allow fast-forward (default)"),
+		N_("allow fast-forward (default)")),
 	OPT_BOOLEAN(0, "ff-only", &fast_forward_only,
-		"abort if fast-forward is not possible"),
+		N_("abort if fast-forward is not possible")),
 	OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
-	OPT_CALLBACK('s', "strategy", &use_strategies, "strategy",
-		"merge strategy to use", option_parse_strategy),
-	OPT_CALLBACK('X', "strategy-option", &xopts, "option=value",
-		"option for selected merge strategy", option_parse_x),
-	OPT_CALLBACK('m', "message", &merge_msg, "message",
-		"merge commit message (for a non-fast-forward merge)",
+	OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"),
+		N_("merge strategy to use"), option_parse_strategy),
+	OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"),
+		N_("option for selected merge strategy"), option_parse_x),
+	OPT_CALLBACK('m', "message", &merge_msg, N_("message"),
+		N_("merge commit message (for a non-fast-forward merge)"),
 		option_parse_message),
 	OPT__VERBOSITY(&verbosity),
 	OPT_BOOLEAN(0, "abort", &abort_current_merge,
-		"abort the current in-progress merge"),
-	OPT_SET_INT(0, "progress", &show_progress, "force progress reporting", 1),
-	{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, "key id",
-	  "GPG sign commit", PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-	OPT_BOOLEAN(0, "overwrite-ignore", &overwrite_ignore, "update ignored files (default)"),
+		N_("abort the current in-progress merge")),
+	OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1),
+	{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key id"),
+	  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+	OPT_BOOLEAN(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")),
 	OPT_END()
 };
 
@@ -404,8 +404,7 @@ static void finish(struct commit *head_commit,
 		opts.output_format |=
 			DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
 		opts.detect_rename = DIFF_DETECT_RENAME;
-		if (diff_setup_done(&opts) < 0)
-			die(_("diff_setup_done failed"));
+		diff_setup_done(&opts);
 		diff_tree_sha1(head, new_head, "", &opts);
 		diffcore_std(&opts);
 		diff_flush(&opts);
@@ -1447,7 +1446,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		refresh_cache(REFRESH_QUIET);
 		if (allow_trivial && !fast_forward_only) {
 			/* See if it is really trivial. */
-			git_committer_info(IDENT_ERROR_ON_NO_NAME);
+			git_committer_info(IDENT_STRICT);
 			printf(_("Trying really trivial in-index merge...\n"));
 			if (!read_tree_trivial(common->item->object.sha1,
 					       head_commit->object.sha1,
@@ -1490,7 +1489,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		die(_("Not possible to fast-forward, aborting."));
 
 	/* We are going to make a new commit. */
-	git_committer_info(IDENT_ERROR_ON_NO_NAME);
+	git_committer_info(IDENT_STRICT);
 
 	/*
 	 * At this point, we need a real merge.  No matter what strategy
diff --git a/builtin/mktree.c b/builtin/mktree.c
index 4ae1c412..f92ba404 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -64,7 +64,7 @@ static void write_tree(unsigned char *sha1)
 }
 
 static const char *mktree_usage[] = {
-	"git mktree [-z] [--missing] [--batch]",
+	N_("git mktree [-z] [--missing] [--batch]"),
 	NULL
 };
 
@@ -150,9 +150,9 @@ int cmd_mktree(int ac, const char **av, const char *prefix)
 	int got_eof = 0;
 
 	const struct option option[] = {
-		OPT_SET_INT('z', NULL, &line_termination, "input is NUL terminated", '\0'),
-		OPT_SET_INT( 0 , "missing", &allow_missing, "allow missing objects", 1),
-		OPT_SET_INT( 0 , "batch", &is_batch_mode, "allow creation of more than one tree", 1),
+		OPT_SET_INT('z', NULL, &line_termination, N_("input is NUL terminated"), '\0'),
+		OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
+		OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("allow creation of more than one tree"), 1),
 		OPT_END()
 	};
 
diff --git a/builtin/mv.c b/builtin/mv.c
index 2a144b01..034fec92 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c
@@ -11,7 +11,7 @@
 #include "parse-options.h"
 
 static const char * const builtin_mv_usage[] = {
-	"git mv [options] <source>... <destination>",
+	N_("git mv [options] <source>... <destination>"),
 	NULL
 };
 
@@ -59,10 +59,10 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
 	int i, newfd;
 	int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
 	struct option builtin_mv_options[] = {
-		OPT__VERBOSE(&verbose, "be verbose"),
-		OPT__DRY_RUN(&show_only, "dry run"),
-		OPT__FORCE(&force, "force move/rename even if target exists"),
-		OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
+		OPT__VERBOSE(&verbose, N_("be verbose")),
+		OPT__DRY_RUN(&show_only, N_("dry run")),
+		OPT__FORCE(&force, N_("force move/rename even if target exists")),
+		OPT_BOOLEAN('k', NULL, &ignore_errors, N_("skip move/rename errors")),
 		OPT_END(),
 	};
 	const char **source, **destination, **dest_path;
diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 1b374583..62382479 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -172,9 +172,9 @@ static void show_name(const struct object *obj,
 }
 
 static char const * const name_rev_usage[] = {
-	"git name-rev [options] <commit>...",
-	"git name-rev [options] --all",
-	"git name-rev [options] --stdin",
+	N_("git name-rev [options] <commit>..."),
+	N_("git name-rev [options] --all"),
+	N_("git name-rev [options] --stdin"),
 	NULL
 };
 
@@ -226,16 +226,16 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
 	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
 	struct name_ref_data data = { 0, 0, NULL };
 	struct option opts[] = {
-		OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
-		OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"),
-		OPT_STRING(0, "refs", &data.ref_filter, "pattern",
-				   "only use refs matching <pattern>"),
+		OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
+		OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
+		OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
+				   N_("only use refs matching <pattern>")),
 		OPT_GROUP(""),
-		OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
-		OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
-		OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
+		OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
+		OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
+		OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
 		OPT_BOOLEAN(0, "always",     &always,
-			   "show abbreviated commit object as fallback"),
+			   N_("show abbreviated commit object as fallback")),
 		OPT_END(),
 	};
 
diff --git a/builtin/notes.c b/builtin/notes.c
index 3644d140..453457ad 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -19,72 +19,75 @@
 #include "string-list.h"
 #include "notes-merge.h"
 
+static void commit_notes(struct notes_tree *t, const char *msg);
+static combine_notes_fn parse_combine_notes_fn(const char *v);
+
 static const char * const git_notes_usage[] = {
-	"git notes [--ref <notes_ref>] [list [<object>]]",
-	"git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
-	"git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>",
-	"git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
-	"git notes [--ref <notes_ref>] edit [<object>]",
-	"git notes [--ref <notes_ref>] show [<object>]",
-	"git notes [--ref <notes_ref>] merge [-v | -q] [-s <strategy> ] <notes_ref>",
-	"git notes merge --commit [-v | -q]",
-	"git notes merge --abort [-v | -q]",
-	"git notes [--ref <notes_ref>] remove [<object>...]",
-	"git notes [--ref <notes_ref>] prune [-n | -v]",
-	"git notes [--ref <notes_ref>] get-ref",
+	N_("git notes [--ref <notes_ref>] [list [<object>]]"),
+	N_("git notes [--ref <notes_ref>] add [-f] [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
+	N_("git notes [--ref <notes_ref>] copy [-f] <from-object> <to-object>"),
+	N_("git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]"),
+	N_("git notes [--ref <notes_ref>] edit [<object>]"),
+	N_("git notes [--ref <notes_ref>] show [<object>]"),
+	N_("git notes [--ref <notes_ref>] merge [-v | -q] [-s <strategy> ] <notes_ref>"),
+	N_("git notes merge --commit [-v | -q]"),
+	N_("git notes merge --abort [-v | -q]"),
+	N_("git notes [--ref <notes_ref>] remove [<object>...]"),
+	N_("git notes [--ref <notes_ref>] prune [-n | -v]"),
+	N_("git notes [--ref <notes_ref>] get-ref"),
 	NULL
 };
 
 static const char * const git_notes_list_usage[] = {
-	"git notes [list [<object>]]",
+	N_("git notes [list [<object>]]"),
 	NULL
 };
 
 static const char * const git_notes_add_usage[] = {
-	"git notes add [<options>] [<object>]",
+	N_("git notes add [<options>] [<object>]"),
 	NULL
 };
 
 static const char * const git_notes_copy_usage[] = {
-	"git notes copy [<options>] <from-object> <to-object>",
-	"git notes copy --stdin [<from-object> <to-object>]...",
+	N_("git notes copy [<options>] <from-object> <to-object>"),
+	N_("git notes copy --stdin [<from-object> <to-object>]..."),
 	NULL
 };
 
 static const char * const git_notes_append_usage[] = {
-	"git notes append [<options>] [<object>]",
+	N_("git notes append [<options>] [<object>]"),
 	NULL
 };
 
 static const char * const git_notes_edit_usage[] = {
-	"git notes edit [<object>]",
+	N_("git notes edit [<object>]"),
 	NULL
 };
 
 static const char * const git_notes_show_usage[] = {
-	"git notes show [<object>]",
+	N_("git notes show [<object>]"),
 	NULL
 };
 
 static const char * const git_notes_merge_usage[] = {
-	"git notes merge [<options>] <notes_ref>",
-	"git notes merge --commit [<options>]",
-	"git notes merge --abort [<options>]",
+	N_("git notes merge [<options>] <notes_ref>"),
+	N_("git notes merge --commit [<options>]"),
+	N_("git notes merge --abort [<options>]"),
 	NULL
 };
 
 static const char * const git_notes_remove_usage[] = {
-	"git notes remove [<object>]",
+	N_("git notes remove [<object>]"),
 	NULL
 };
 
 static const char * const git_notes_prune_usage[] = {
-	"git notes prune [<options>]",
+	N_("git notes prune [<options>]"),
 	NULL
 };
 
 static const char * const git_notes_get_ref_usage[] = {
-	"git notes get-ref",
+	N_("git notes get-ref"),
 	NULL
 };
 
@@ -288,7 +291,7 @@ static int parse_reedit_arg(const struct option *opt, const char *arg, int unset
 	return parse_reuse_arg(opt, arg, unset);
 }
 
-void commit_notes(struct notes_tree *t, const char *msg)
+static void commit_notes(struct notes_tree *t, const char *msg)
 {
 	struct strbuf buf = STRBUF_INIT;
 	unsigned char commit_sha1[20];
@@ -312,7 +315,7 @@ void commit_notes(struct notes_tree *t, const char *msg)
 	strbuf_release(&buf);
 }
 
-combine_notes_fn parse_combine_notes_fn(const char *v)
+static combine_notes_fn parse_combine_notes_fn(const char *v)
 {
 	if (!strcasecmp(v, "overwrite"))
 		return combine_notes_overwrite;
@@ -531,19 +534,19 @@ static int add(int argc, const char **argv, const char *prefix)
 	const unsigned char *note;
 	struct msg_arg msg = { 0, 0, STRBUF_INIT };
 	struct option options[] = {
-		{ OPTION_CALLBACK, 'm', "message", &msg, "msg",
-			"note contents as a string", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'm', "message", &msg, N_("message"),
+			N_("note contents as a string"), PARSE_OPT_NONEG,
 			parse_msg_arg},
-		{ OPTION_CALLBACK, 'F', "file", &msg, "file",
-			"note contents in a file", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'F', "file", &msg, N_("file"),
+			N_("note contents in a file"), PARSE_OPT_NONEG,
 			parse_file_arg},
-		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, "object",
-			"reuse and edit specified note object", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, N_("object"),
+			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 			parse_reedit_arg},
-		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, "object",
-			"reuse specified note object", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, N_("object"),
+			N_("reuse specified note object"), PARSE_OPT_NONEG,
 			parse_reuse_arg},
-		OPT__FORCE(&force, "replace existing notes"),
+		OPT__FORCE(&force, N_("replace existing notes")),
 		OPT_END()
 	};
 
@@ -611,11 +614,11 @@ static int copy(int argc, const char **argv, const char *prefix)
 	struct notes_tree *t;
 	const char *rewrite_cmd = NULL;
 	struct option options[] = {
-		OPT__FORCE(&force, "replace existing notes"),
-		OPT_BOOLEAN(0, "stdin", &from_stdin, "read objects from stdin"),
-		OPT_STRING(0, "for-rewrite", &rewrite_cmd, "command",
-			   "load rewriting config for <command> (implies "
-			   "--stdin)"),
+		OPT__FORCE(&force, N_("replace existing notes")),
+		OPT_BOOLEAN(0, "stdin", &from_stdin, N_("read objects from stdin")),
+		OPT_STRING(0, "for-rewrite", &rewrite_cmd, N_("command"),
+			   N_("load rewriting config for <command> (implies "
+			      "--stdin)")),
 		OPT_END()
 	};
 
@@ -688,17 +691,17 @@ static int append_edit(int argc, const char **argv, const char *prefix)
 	const char * const *usage;
 	struct msg_arg msg = { 0, 0, STRBUF_INIT };
 	struct option options[] = {
-		{ OPTION_CALLBACK, 'm', "message", &msg, "msg",
-			"note contents as a string", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'm', "message", &msg, N_("message"),
+			N_("note contents as a string"), PARSE_OPT_NONEG,
 			parse_msg_arg},
-		{ OPTION_CALLBACK, 'F', "file", &msg, "file",
-			"note contents in a file", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'F', "file", &msg, N_("file"),
+			N_("note contents in a file"), PARSE_OPT_NONEG,
 			parse_file_arg},
-		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, "object",
-			"reuse and edit specified note object", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'c', "reedit-message", &msg, N_("object"),
+			N_("reuse and edit specified note object"), PARSE_OPT_NONEG,
 			parse_reedit_arg},
-		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, "object",
-			"reuse specified note object", PARSE_OPT_NONEG,
+		{ OPTION_CALLBACK, 'C', "reuse-message", &msg, N_("object"),
+			N_("reuse specified note object"), PARSE_OPT_NONEG,
 			parse_reuse_arg},
 		OPT_END()
 	};
@@ -861,19 +864,19 @@ static int merge(int argc, const char **argv, const char *prefix)
 	int verbosity = 0, result;
 	const char *strategy = NULL;
 	struct option options[] = {
-		OPT_GROUP("General options"),
+		OPT_GROUP(N_("General options")),
 		OPT__VERBOSITY(&verbosity),
-		OPT_GROUP("Merge options"),
-		OPT_STRING('s', "strategy", &strategy, "strategy",
-			   "resolve notes conflicts using the given strategy "
-			   "(manual/ours/theirs/union/cat_sort_uniq)"),
-		OPT_GROUP("Committing unmerged notes"),
+		OPT_GROUP(N_("Merge options")),
+		OPT_STRING('s', "strategy", &strategy, N_("strategy"),
+			   N_("resolve notes conflicts using the given strategy "
+			      "(manual/ours/theirs/union/cat_sort_uniq)")),
+		OPT_GROUP(N_("Committing unmerged notes")),
 		{ OPTION_BOOLEAN, 0, "commit", &do_commit, NULL,
-			"finalize notes merge by committing unmerged notes",
+			N_("finalize notes merge by committing unmerged notes"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG },
-		OPT_GROUP("Aborting notes merge resolution"),
+		OPT_GROUP(N_("Aborting notes merge resolution")),
 		{ OPTION_BOOLEAN, 0, "abort", &do_abort, NULL,
-			"abort notes merge",
+			N_("abort notes merge"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG },
 		OPT_END()
 	};
@@ -980,10 +983,10 @@ static int remove_cmd(int argc, const char **argv, const char *prefix)
 	int from_stdin = 0;
 	struct option options[] = {
 		OPT_BIT(0, "ignore-missing", &flag,
-			"attempt to remove non-existent note is not an error",
+			N_("attempt to remove non-existent note is not an error"),
 			IGNORE_MISSING),
 		OPT_BOOLEAN(0, "stdin", &from_stdin,
-			    "read object names from the standard input"),
+			    N_("read object names from the standard input")),
 		OPT_END()
 	};
 	struct notes_tree *t;
@@ -1064,8 +1067,8 @@ int cmd_notes(int argc, const char **argv, const char *prefix)
 	int result;
 	const char *override_notes_ref = NULL;
 	struct option options[] = {
-		OPT_STRING(0, "ref", &override_notes_ref, "notes_ref",
-			   "use notes from <notes_ref>"),
+		OPT_STRING(0, "ref", &override_notes_ref, N_("notes_ref"),
+			   N_("use notes from <notes_ref>")),
 		OPT_END()
 	};
 
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 1861093e..5e140640 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -16,11 +16,12 @@
 #include "list-objects.h"
 #include "progress.h"
 #include "refs.h"
+#include "streaming.h"
 #include "thread-utils.h"
 
 static const char *pack_usage[] = {
-	"git pack-objects --stdout [options...] [< ref-list | < object-list]",
-	"git pack-objects [options...] base-name [< ref-list | < object-list]",
+	N_("git pack-objects --stdout [options...] [< ref-list | < object-list]"),
+	N_("git pack-objects [options...] base-name [< ref-list | < object-list]"),
 	NULL
 };
 
@@ -150,6 +151,46 @@ static unsigned long do_compress(void **pptr, unsigned long size)
 	return stream.total_out;
 }
 
+static unsigned long write_large_blob_data(struct git_istream *st, struct sha1file *f,
+					   const unsigned char *sha1)
+{
+	git_zstream stream;
+	unsigned char ibuf[1024 * 16];
+	unsigned char obuf[1024 * 16];
+	unsigned long olen = 0;
+
+	memset(&stream, 0, sizeof(stream));
+	git_deflate_init(&stream, pack_compression_level);
+
+	for (;;) {
+		ssize_t readlen;
+		int zret = Z_OK;
+		readlen = read_istream(st, ibuf, sizeof(ibuf));
+		if (readlen == -1)
+			die(_("unable to read %s"), sha1_to_hex(sha1));
+
+		stream.next_in = ibuf;
+		stream.avail_in = readlen;
+		while ((stream.avail_in || readlen == 0) &&
+		       (zret == Z_OK || zret == Z_BUF_ERROR)) {
+			stream.next_out = obuf;
+			stream.avail_out = sizeof(obuf);
+			zret = git_deflate(&stream, readlen ? 0 : Z_FINISH);
+			sha1write(f, obuf, stream.next_out - obuf);
+			olen += stream.next_out - obuf;
+		}
+		if (stream.avail_in)
+			die(_("deflate error (%d)"), zret);
+		if (readlen == 0) {
+			if (zret != Z_STREAM_END)
+				die(_("deflate error (%d)"), zret);
+			break;
+		}
+	}
+	git_deflate_end(&stream);
+	return olen;
+}
+
 /*
  * we are going to reuse the existing object data as is.  make
  * sure it is not corrupt.
@@ -200,22 +241,198 @@ static void copy_pack_data(struct sha1file *f,
 }
 
 /* Return 0 if we will bust the pack-size limit */
-static unsigned long write_object(struct sha1file *f,
-				  struct object_entry *entry,
-				  off_t write_offset)
+static unsigned long write_no_reuse_object(struct sha1file *f, struct object_entry *entry,
+					   unsigned long limit, int usable_delta)
 {
-	unsigned long size, limit, datalen;
-	void *buf;
+	unsigned long size, datalen;
 	unsigned char header[10], dheader[10];
 	unsigned hdrlen;
 	enum object_type type;
+	void *buf;
+	struct git_istream *st = NULL;
+
+	if (!usable_delta) {
+		if (entry->type == OBJ_BLOB &&
+		    entry->size > big_file_threshold &&
+		    (st = open_istream(entry->idx.sha1, &type, &size, NULL)) != NULL)
+			buf = NULL;
+		else {
+			buf = read_sha1_file(entry->idx.sha1, &type, &size);
+			if (!buf)
+				die(_("unable to read %s"), sha1_to_hex(entry->idx.sha1));
+		}
+		/*
+		 * make sure no cached delta data remains from a
+		 * previous attempt before a pack split occurred.
+		 */
+		free(entry->delta_data);
+		entry->delta_data = NULL;
+		entry->z_delta_size = 0;
+	} else if (entry->delta_data) {
+		size = entry->delta_size;
+		buf = entry->delta_data;
+		entry->delta_data = NULL;
+		type = (allow_ofs_delta && entry->delta->idx.offset) ?
+			OBJ_OFS_DELTA : OBJ_REF_DELTA;
+	} else {
+		buf = get_delta(entry);
+		size = entry->delta_size;
+		type = (allow_ofs_delta && entry->delta->idx.offset) ?
+			OBJ_OFS_DELTA : OBJ_REF_DELTA;
+	}
+
+	if (st)	/* large blob case, just assume we don't compress well */
+		datalen = size;
+	else if (entry->z_delta_size)
+		datalen = entry->z_delta_size;
+	else
+		datalen = do_compress(&buf, size);
+
+	/*
+	 * The object header is a byte of 'type' followed by zero or
+	 * more bytes of length.
+	 */
+	hdrlen = encode_in_pack_object_header(type, size, header);
+
+	if (type == OBJ_OFS_DELTA) {
+		/*
+		 * Deltas with relative base contain an additional
+		 * encoding of the relative offset for the delta
+		 * base from this object's position in the pack.
+		 */
+		off_t ofs = entry->idx.offset - entry->delta->idx.offset;
+		unsigned pos = sizeof(dheader) - 1;
+		dheader[pos] = ofs & 127;
+		while (ofs >>= 7)
+			dheader[--pos] = 128 | (--ofs & 127);
+		if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
+			if (st)
+				close_istream(st);
+			free(buf);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+		sha1write(f, dheader + pos, sizeof(dheader) - pos);
+		hdrlen += sizeof(dheader) - pos;
+	} else if (type == OBJ_REF_DELTA) {
+		/*
+		 * Deltas with a base reference contain
+		 * an additional 20 bytes for the base sha1.
+		 */
+		if (limit && hdrlen + 20 + datalen + 20 >= limit) {
+			if (st)
+				close_istream(st);
+			free(buf);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+		sha1write(f, entry->delta->idx.sha1, 20);
+		hdrlen += 20;
+	} else {
+		if (limit && hdrlen + datalen + 20 >= limit) {
+			if (st)
+				close_istream(st);
+			free(buf);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+	}
+	if (st) {
+		datalen = write_large_blob_data(st, f, entry->idx.sha1);
+		close_istream(st);
+	} else {
+		sha1write(f, buf, datalen);
+		free(buf);
+	}
+
+	return hdrlen + datalen;
+}
+
+/* Return 0 if we will bust the pack-size limit */
+static unsigned long write_reuse_object(struct sha1file *f, struct object_entry *entry,
+					unsigned long limit, int usable_delta)
+{
+	struct packed_git *p = entry->in_pack;
+	struct pack_window *w_curs = NULL;
+	struct revindex_entry *revidx;
+	off_t offset;
+	enum object_type type = entry->type;
+	unsigned long datalen;
+	unsigned char header[10], dheader[10];
+	unsigned hdrlen;
+
+	if (entry->delta)
+		type = (allow_ofs_delta && entry->delta->idx.offset) ?
+			OBJ_OFS_DELTA : OBJ_REF_DELTA;
+	hdrlen = encode_in_pack_object_header(type, entry->size, header);
+
+	offset = entry->in_pack_offset;
+	revidx = find_pack_revindex(p, offset);
+	datalen = revidx[1].offset - offset;
+	if (!pack_to_stdout && p->index_version > 1 &&
+	    check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
+		error("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
+		unuse_pack(&w_curs);
+		return write_no_reuse_object(f, entry, limit, usable_delta);
+	}
+
+	offset += entry->in_pack_header_size;
+	datalen -= entry->in_pack_header_size;
+
+	if (!pack_to_stdout && p->index_version == 1 &&
+	    check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
+		error("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
+		unuse_pack(&w_curs);
+		return write_no_reuse_object(f, entry, limit, usable_delta);
+	}
+
+	if (type == OBJ_OFS_DELTA) {
+		off_t ofs = entry->idx.offset - entry->delta->idx.offset;
+		unsigned pos = sizeof(dheader) - 1;
+		dheader[pos] = ofs & 127;
+		while (ofs >>= 7)
+			dheader[--pos] = 128 | (--ofs & 127);
+		if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
+			unuse_pack(&w_curs);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+		sha1write(f, dheader + pos, sizeof(dheader) - pos);
+		hdrlen += sizeof(dheader) - pos;
+		reused_delta++;
+	} else if (type == OBJ_REF_DELTA) {
+		if (limit && hdrlen + 20 + datalen + 20 >= limit) {
+			unuse_pack(&w_curs);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+		sha1write(f, entry->delta->idx.sha1, 20);
+		hdrlen += 20;
+		reused_delta++;
+	} else {
+		if (limit && hdrlen + datalen + 20 >= limit) {
+			unuse_pack(&w_curs);
+			return 0;
+		}
+		sha1write(f, header, hdrlen);
+	}
+	copy_pack_data(f, p, &w_curs, offset, datalen);
+	unuse_pack(&w_curs);
+	reused++;
+	return hdrlen + datalen;
+}
+
+/* Return 0 if we will bust the pack-size limit */
+static unsigned long write_object(struct sha1file *f,
+				  struct object_entry *entry,
+				  off_t write_offset)
+{
+	unsigned long limit, len;
 	int usable_delta, to_reuse;
 
 	if (!pack_to_stdout)
 		crc32_begin(f);
 
-	type = entry->type;
-
 	/* apply size limit if limited packsize and not first object */
 	if (!pack_size_limit || !nr_written)
 		limit = 0;
@@ -243,11 +460,11 @@ static unsigned long write_object(struct sha1file *f,
 		to_reuse = 0;	/* explicit */
 	else if (!entry->in_pack)
 		to_reuse = 0;	/* can't reuse what we don't have */
-	else if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA)
+	else if (entry->type == OBJ_REF_DELTA || entry->type == OBJ_OFS_DELTA)
 				/* check_object() decided it for us ... */
 		to_reuse = usable_delta;
 				/* ... but pack split may override that */
-	else if (type != entry->in_pack_type)
+	else if (entry->type != entry->in_pack_type)
 		to_reuse = 0;	/* pack has delta which is unusable */
 	else if (entry->delta)
 		to_reuse = 0;	/* we want to pack afresh */
@@ -256,153 +473,19 @@ static unsigned long write_object(struct sha1file *f,
 				 * and we do not need to deltify it.
 				 */
 
-	if (!to_reuse) {
-		no_reuse:
-		if (!usable_delta) {
-			buf = read_sha1_file(entry->idx.sha1, &type, &size);
-			if (!buf)
-				die("unable to read %s", sha1_to_hex(entry->idx.sha1));
-			/*
-			 * make sure no cached delta data remains from a
-			 * previous attempt before a pack split occurred.
-			 */
-			free(entry->delta_data);
-			entry->delta_data = NULL;
-			entry->z_delta_size = 0;
-		} else if (entry->delta_data) {
-			size = entry->delta_size;
-			buf = entry->delta_data;
-			entry->delta_data = NULL;
-			type = (allow_ofs_delta && entry->delta->idx.offset) ?
-				OBJ_OFS_DELTA : OBJ_REF_DELTA;
-		} else {
-			buf = get_delta(entry);
-			size = entry->delta_size;
-			type = (allow_ofs_delta && entry->delta->idx.offset) ?
-				OBJ_OFS_DELTA : OBJ_REF_DELTA;
-		}
-
-		if (entry->z_delta_size)
-			datalen = entry->z_delta_size;
-		else
-			datalen = do_compress(&buf, size);
-
-		/*
-		 * The object header is a byte of 'type' followed by zero or
-		 * more bytes of length.
-		 */
-		hdrlen = encode_in_pack_object_header(type, size, header);
-
-		if (type == OBJ_OFS_DELTA) {
-			/*
-			 * Deltas with relative base contain an additional
-			 * encoding of the relative offset for the delta
-			 * base from this object's position in the pack.
-			 */
-			off_t ofs = entry->idx.offset - entry->delta->idx.offset;
-			unsigned pos = sizeof(dheader) - 1;
-			dheader[pos] = ofs & 127;
-			while (ofs >>= 7)
-				dheader[--pos] = 128 | (--ofs & 127);
-			if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
-				free(buf);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-			sha1write(f, dheader + pos, sizeof(dheader) - pos);
-			hdrlen += sizeof(dheader) - pos;
-		} else if (type == OBJ_REF_DELTA) {
-			/*
-			 * Deltas with a base reference contain
-			 * an additional 20 bytes for the base sha1.
-			 */
-			if (limit && hdrlen + 20 + datalen + 20 >= limit) {
-				free(buf);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-			sha1write(f, entry->delta->idx.sha1, 20);
-			hdrlen += 20;
-		} else {
-			if (limit && hdrlen + datalen + 20 >= limit) {
-				free(buf);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-		}
-		sha1write(f, buf, datalen);
-		free(buf);
-	}
-	else {
-		struct packed_git *p = entry->in_pack;
-		struct pack_window *w_curs = NULL;
-		struct revindex_entry *revidx;
-		off_t offset;
-
-		if (entry->delta)
-			type = (allow_ofs_delta && entry->delta->idx.offset) ?
-				OBJ_OFS_DELTA : OBJ_REF_DELTA;
-		hdrlen = encode_in_pack_object_header(type, entry->size, header);
-
-		offset = entry->in_pack_offset;
-		revidx = find_pack_revindex(p, offset);
-		datalen = revidx[1].offset - offset;
-		if (!pack_to_stdout && p->index_version > 1 &&
-		    check_pack_crc(p, &w_curs, offset, datalen, revidx->nr)) {
-			error("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
-			unuse_pack(&w_curs);
-			goto no_reuse;
-		}
-
-		offset += entry->in_pack_header_size;
-		datalen -= entry->in_pack_header_size;
-		if (!pack_to_stdout && p->index_version == 1 &&
-		    check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
-			error("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
-			unuse_pack(&w_curs);
-			goto no_reuse;
-		}
+	if (!to_reuse)
+		len = write_no_reuse_object(f, entry, limit, usable_delta);
+	else
+		len = write_reuse_object(f, entry, limit, usable_delta);
+	if (!len)
+		return 0;
 
-		if (type == OBJ_OFS_DELTA) {
-			off_t ofs = entry->idx.offset - entry->delta->idx.offset;
-			unsigned pos = sizeof(dheader) - 1;
-			dheader[pos] = ofs & 127;
-			while (ofs >>= 7)
-				dheader[--pos] = 128 | (--ofs & 127);
-			if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
-				unuse_pack(&w_curs);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-			sha1write(f, dheader + pos, sizeof(dheader) - pos);
-			hdrlen += sizeof(dheader) - pos;
-			reused_delta++;
-		} else if (type == OBJ_REF_DELTA) {
-			if (limit && hdrlen + 20 + datalen + 20 >= limit) {
-				unuse_pack(&w_curs);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-			sha1write(f, entry->delta->idx.sha1, 20);
-			hdrlen += 20;
-			reused_delta++;
-		} else {
-			if (limit && hdrlen + datalen + 20 >= limit) {
-				unuse_pack(&w_curs);
-				return 0;
-			}
-			sha1write(f, header, hdrlen);
-		}
-		copy_pack_data(f, p, &w_curs, offset, datalen);
-		unuse_pack(&w_curs);
-		reused++;
-	}
 	if (usable_delta)
 		written_delta++;
 	written++;
 	if (!pack_to_stdout)
 		entry->idx.crc32 = crc32_end(f);
-	return hdrlen + datalen;
+	return len;
 }
 
 enum write_one_status {
@@ -1327,7 +1410,7 @@ static void get_object_details(void)
 	for (i = 0; i < nr_objects; i++) {
 		struct object_entry *entry = sorted_by_offset[i];
 		check_object(entry);
-		if (big_file_threshold <= entry->size)
+		if (big_file_threshold < entry->size)
 			entry->no_try_delta = 1;
 	}
 
@@ -2290,7 +2373,7 @@ static void get_object_list(int ac, const char **av)
 			}
 			die("not a rev '%s'", line);
 		}
-		if (handle_revision_arg(line, &revs, flags, 1))
+		if (handle_revision_arg(line, &revs, flags, REVARG_CANNOT_BE_FILENAME))
 			die("bad revision '%s'", line);
 	}
 
@@ -2362,67 +2445,67 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 	int rev_list_unpacked = 0, rev_list_all = 0, rev_list_reflog = 0;
 	struct option pack_objects_options[] = {
 		OPT_SET_INT('q', "quiet", &progress,
-			    "do not show progress meter", 0),
+			    N_("do not show progress meter"), 0),
 		OPT_SET_INT(0, "progress", &progress,
-			    "show progress meter", 1),
+			    N_("show progress meter"), 1),
 		OPT_SET_INT(0, "all-progress", &progress,
-			    "show progress meter during object writing phase", 2),
+			    N_("show progress meter during object writing phase"), 2),
 		OPT_BOOL(0, "all-progress-implied",
 			 &all_progress_implied,
-			 "similar to --all-progress when progress meter is shown"),
-		{ OPTION_CALLBACK, 0, "index-version", NULL, "version[,offset]",
-		  "write the pack index file in the specified idx format version",
+			 N_("similar to --all-progress when progress meter is shown")),
+		{ OPTION_CALLBACK, 0, "index-version", NULL, N_("version[,offset]"),
+		  N_("write the pack index file in the specified idx format version"),
 		  0, option_parse_index_version },
 		OPT_ULONG(0, "max-pack-size", &pack_size_limit,
-			  "maximum size of each output pack file"),
+			  N_("maximum size of each output pack file")),
 		OPT_BOOL(0, "local", &local,
-			 "ignore borrowed objects from alternate object store"),
+			 N_("ignore borrowed objects from alternate object store")),
 		OPT_BOOL(0, "incremental", &incremental,
-			 "ignore packed objects"),
+			 N_("ignore packed objects")),
 		OPT_INTEGER(0, "window", &window,
-			    "limit pack window by objects"),
+			    N_("limit pack window by objects")),
 		OPT_ULONG(0, "window-memory", &window_memory_limit,
-			  "limit pack window by memory in addition to object limit"),
+			  N_("limit pack window by memory in addition to object limit")),
 		OPT_INTEGER(0, "depth", &depth,
-			    "maximum length of delta chain allowed in the resulting pack"),
+			    N_("maximum length of delta chain allowed in the resulting pack")),
 		OPT_BOOL(0, "reuse-delta", &reuse_delta,
-			 "reuse existing deltas"),
+			 N_("reuse existing deltas")),
 		OPT_BOOL(0, "reuse-object", &reuse_object,
-			 "reuse existing objects"),
+			 N_("reuse existing objects")),
 		OPT_BOOL(0, "delta-base-offset", &allow_ofs_delta,
-			 "use OFS_DELTA objects"),
+			 N_("use OFS_DELTA objects")),
 		OPT_INTEGER(0, "threads", &delta_search_threads,
-			    "use threads when searching for best delta matches"),
+			    N_("use threads when searching for best delta matches")),
 		OPT_BOOL(0, "non-empty", &non_empty,
-			 "do not create an empty pack output"),
+			 N_("do not create an empty pack output")),
 		OPT_BOOL(0, "revs", &use_internal_rev_list,
-			 "read revision arguments from standard input"),
+			 N_("read revision arguments from standard input")),
 		{ OPTION_SET_INT, 0, "unpacked", &rev_list_unpacked, NULL,
-		  "limit the objects to those that are not yet packed",
+		  N_("limit the objects to those that are not yet packed"),
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
 		{ OPTION_SET_INT, 0, "all", &rev_list_all, NULL,
-		  "include objects reachable from any reference",
+		  N_("include objects reachable from any reference"),
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
 		{ OPTION_SET_INT, 0, "reflog", &rev_list_reflog, NULL,
-		  "include objects referred by reflog entries",
+		  N_("include objects referred by reflog entries"),
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1 },
 		OPT_BOOL(0, "stdout", &pack_to_stdout,
-			 "output pack to stdout"),
+			 N_("output pack to stdout")),
 		OPT_BOOL(0, "include-tag", &include_tag,
-			 "include tag objects that refer to objects to be packed"),
+			 N_("include tag objects that refer to objects to be packed")),
 		OPT_BOOL(0, "keep-unreachable", &keep_unreachable,
-			 "keep unreachable objects"),
-		{ OPTION_CALLBACK, 0, "unpack-unreachable", NULL, "time",
-		  "unpack unreachable objects newer than <time>",
+			 N_("keep unreachable objects")),
+		{ OPTION_CALLBACK, 0, "unpack-unreachable", NULL, N_("time"),
+		  N_("unpack unreachable objects newer than <time>"),
 		  PARSE_OPT_OPTARG, option_parse_unpack_unreachable },
 		OPT_BOOL(0, "thin", &thin,
-			 "create thin packs"),
+			 N_("create thin packs")),
 		OPT_BOOL(0, "honor-pack-keep", &ignore_packed_keep,
-			 "ignore packs that have companion .keep file"),
+			 N_("ignore packs that have companion .keep file")),
 		OPT_INTEGER(0, "compression", &pack_compression_level,
-			    "pack compression level"),
+			    N_("pack compression level")),
 		OPT_SET_INT(0, "keep-true-parents", &grafts_replace_parents,
-			    "do not hide commits by grafts", 0),
+			    N_("do not hide commits by grafts"), 0),
 		OPT_END(),
 	};
 
diff --git a/builtin/pack-refs.c b/builtin/pack-refs.c
index 39a9d89f..b5a0f88e 100644
--- a/builtin/pack-refs.c
+++ b/builtin/pack-refs.c
@@ -3,7 +3,7 @@
 #include "pack-refs.h"
 
 static char const * const pack_refs_usage[] = {
-	"git pack-refs [options]",
+	N_("git pack-refs [options]"),
 	NULL
 };
 
@@ -11,8 +11,8 @@ int cmd_pack_refs(int argc, const char **argv, const char *prefix)
 {
 	unsigned int flags = PACK_REFS_PRUNE;
 	struct option opts[] = {
-		OPT_BIT(0, "all",   &flags, "pack everything", PACK_REFS_ALL),
-		OPT_BIT(0, "prune", &flags, "prune loose refs (default)", PACK_REFS_PRUNE),
+		OPT_BIT(0, "all",   &flags, N_("pack everything"), PACK_REFS_ALL),
+		OPT_BIT(0, "prune", &flags, N_("prune loose refs (default)"), PACK_REFS_PRUNE),
 		OPT_END(),
 	};
 	if (parse_options(argc, argv, prefix, opts, pack_refs_usage, 0))
diff --git a/builtin/prune-packed.c b/builtin/prune-packed.c
index b58a2e1e..83382c1f 100644
--- a/builtin/prune-packed.c
+++ b/builtin/prune-packed.c
@@ -4,7 +4,7 @@
 #include "parse-options.h"
 
 static const char * const prune_packed_usage[] = {
-	"git prune-packed [-n|--dry-run] [-q|--quiet]",
+	N_("git prune-packed [-n|--dry-run] [-q|--quiet]"),
 	NULL
 };
 
@@ -73,8 +73,8 @@ int cmd_prune_packed(int argc, const char **argv, const char *prefix)
 {
 	int opts = isatty(2) ? VERBOSE : 0;
 	const struct option prune_packed_options[] = {
-		OPT_BIT('n', "dry-run", &opts, "dry run", DRY_RUN),
-		OPT_NEGBIT('q', "quiet", &opts, "be quiet", VERBOSE),
+		OPT_BIT('n', "dry-run", &opts, N_("dry run"), DRY_RUN),
+		OPT_NEGBIT('q', "quiet", &opts, N_("be quiet"), VERBOSE),
 		OPT_END()
 	};
 
diff --git a/builtin/prune.c b/builtin/prune.c
index b99b635e..8cb8b918 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -9,7 +9,7 @@
 #include "dir.h"
 
 static const char * const prune_usage[] = {
-	"git prune [-n] [-v] [--expire <time>] [--] [<head>...]",
+	N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
 	NULL
 };
 static int show_only;
@@ -25,7 +25,8 @@ static int prune_tmp_object(const char *path, const char *filename)
 		return error("Could not stat '%s'", fullpath);
 	if (st.st_mtime > expire)
 		return 0;
-	printf("Removing stale temporary file %s\n", fullpath);
+	if (show_only || verbose)
+		printf("Removing stale temporary file %s\n", fullpath);
 	if (!show_only)
 		unlink_or_warn(fullpath);
 	return 0;
@@ -128,11 +129,11 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 	struct rev_info revs;
 	struct progress *progress = NULL;
 	const struct option options[] = {
-		OPT__DRY_RUN(&show_only, "do not remove, show only"),
-		OPT__VERBOSE(&verbose, "report pruned objects"),
-		OPT_BOOL(0, "progress", &show_progress, "show progress"),
+		OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
+		OPT__VERBOSE(&verbose, N_("report pruned objects")),
+		OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 		OPT_DATE(0, "expire", &expire,
-			 "expire objects older than <time>"),
+			 N_("expire objects older than <time>")),
 		OPT_END()
 	};
 	char *s;
@@ -168,7 +169,7 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 
 	prune_packed_objects(show_only);
 	remove_temporary_files(get_object_directory());
-	s = xstrdup(mkpath("%s/pack", get_object_directory()));
+	s = mkpathdup("%s/pack", get_object_directory());
 	remove_temporary_files(s);
 	free(s);
 	return 0;
diff --git a/builtin/push.c b/builtin/push.c
index 69367131..db9ba30b 100644
--- a/builtin/push.c
+++ b/builtin/push.c
@@ -11,7 +11,7 @@
 #include "submodule.h"
 
 static const char * const push_usage[] = {
-	"git push [<options>] [<repository> [<refspec>...]]",
+	N_("git push [<options>] [<repository> [<refspec>...]]"),
 	NULL,
 };
 
@@ -76,7 +76,44 @@ static int push_url_of_remote(struct remote *remote, const char ***url_p)
 	return remote->url_nr;
 }
 
-static void setup_push_upstream(struct remote *remote)
+static NORETURN int die_push_simple(struct branch *branch, struct remote *remote) {
+	/*
+	 * There's no point in using shorten_unambiguous_ref here,
+	 * as the ambiguity would be on the remote side, not what
+	 * we have locally. Plus, this is supposed to be the simple
+	 * mode. If the user is doing something crazy like setting
+	 * upstream to a non-branch, we should probably be showing
+	 * them the big ugly fully qualified ref.
+	 */
+	const char *advice_maybe = "";
+	const char *short_upstream =
+		skip_prefix(branch->merge[0]->src, "refs/heads/");
+
+	if (!short_upstream)
+		short_upstream = branch->merge[0]->src;
+	/*
+	 * Don't show advice for people who explicitely set
+	 * push.default.
+	 */
+	if (push_default == PUSH_DEFAULT_UNSPECIFIED)
+		advice_maybe = _("\n"
+				 "To choose either option permanently, "
+				 "see push.default in 'git help config'.");
+	die(_("The upstream branch of your current branch does not match\n"
+	      "the name of your current branch.  To push to the upstream branch\n"
+	      "on the remote, use\n"
+	      "\n"
+	      "    git push %s HEAD:%s\n"
+	      "\n"
+	      "To push to the branch of the same name on the remote, use\n"
+	      "\n"
+	      "    git push %s %s\n"
+	      "%s"),
+	    remote->name, short_upstream,
+	    remote->name, branch->name, advice_maybe);
+}
+
+static void setup_push_upstream(struct remote *remote, int simple)
 {
 	struct strbuf refspec = STRBUF_INIT;
 	struct branch *branch = branch_get(NULL);
@@ -103,24 +140,55 @@ static void setup_push_upstream(struct remote *remote)
 		      "your current branch '%s', without telling me what to push\n"
 		      "to update which remote branch."),
 		    remote->name, branch->name);
+	if (simple && strcmp(branch->refname, branch->merge[0]->src))
+		die_push_simple(branch, remote);
 
 	strbuf_addf(&refspec, "%s:%s", branch->name, branch->merge[0]->src);
 	add_refspec(refspec.buf);
 }
 
+static char warn_unspecified_push_default_msg[] =
+N_("push.default is unset; its implicit value is changing in\n"
+   "Git 2.0 from 'matching' to 'simple'. To squelch this message\n"
+   "and maintain the current behavior after the default changes, use:\n"
+   "\n"
+   "  git config --global push.default matching\n"
+   "\n"
+   "To squelch this message and adopt the new behavior now, use:\n"
+   "\n"
+   "  git config --global push.default simple\n"
+   "\n"
+   "See 'git help config' and search for 'push.default' for further information.\n"
+   "(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode\n"
+   "'current' instead of 'simple' if you sometimes use older versions of Git)");
+
+static void warn_unspecified_push_default_configuration(void)
+{
+	static int warn_once;
+
+	if (warn_once++)
+		return;
+	warning("%s\n", _(warn_unspecified_push_default_msg));
+}
+
 static void setup_default_push_refspecs(struct remote *remote)
 {
 	switch (push_default) {
 	default:
 	case PUSH_DEFAULT_UNSPECIFIED:
 		default_matching_used = 1;
+		warn_unspecified_push_default_configuration();
 		/* fallthru */
 	case PUSH_DEFAULT_MATCHING:
 		add_refspec(":");
 		break;
 
+	case PUSH_DEFAULT_SIMPLE:
+		setup_push_upstream(remote, 1);
+		break;
+
 	case PUSH_DEFAULT_UPSTREAM:
-		setup_push_upstream(remote);
+		setup_push_upstream(remote, 0);
 		break;
 
 	case PUSH_DEFAULT_CURRENT:
@@ -143,8 +211,8 @@ static const char message_advice_pull_before_push[] =
 static const char message_advice_use_upstream[] =
 	N_("Updates were rejected because a pushed branch tip is behind its remote\n"
 	   "counterpart. If you did not intend to push that branch, you may want to\n"
-	   "specify branches to push or set the 'push.default' configuration\n"
-	   "variable to 'current' or 'upstream' to push only the current branch.");
+	   "specify branches to push or set the 'push.default' configuration variable\n"
+	   "to 'simple', 'current' or 'upstream' to push only the current branch.");
 
 static const char message_advice_checkout_pull_push[] =
 	N_("Updates were rejected because a pushed branch tip is behind its remote\n"
@@ -284,13 +352,21 @@ static int option_parse_recurse_submodules(const struct option *opt,
 				   const char *arg, int unset)
 {
 	int *flags = opt->value;
+
+	if (*flags & (TRANSPORT_RECURSE_SUBMODULES_CHECK |
+		      TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND))
+		die("%s can only be used once.", opt->long_name);
+
 	if (arg) {
 		if (!strcmp(arg, "check"))
 			*flags |= TRANSPORT_RECURSE_SUBMODULES_CHECK;
+		else if (!strcmp(arg, "on-demand"))
+			*flags |= TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND;
 		else
 			die("bad %s argument: %s", opt->long_name, arg);
 	} else
-		die("option %s needs an argument (check)", opt->long_name);
+		die("option %s needs an argument (check|on-demand)",
+				opt->long_name);
 
 	return 0;
 }
@@ -303,25 +379,25 @@ int cmd_push(int argc, const char **argv, const char *prefix)
 	const char *repo = NULL;	/* default repository */
 	struct option options[] = {
 		OPT__VERBOSITY(&verbosity),
-		OPT_STRING( 0 , "repo", &repo, "repository", "repository"),
-		OPT_BIT( 0 , "all", &flags, "push all refs", TRANSPORT_PUSH_ALL),
-		OPT_BIT( 0 , "mirror", &flags, "mirror all refs",
+		OPT_STRING( 0 , "repo", &repo, N_("repository"), N_("repository")),
+		OPT_BIT( 0 , "all", &flags, N_("push all refs"), TRANSPORT_PUSH_ALL),
+		OPT_BIT( 0 , "mirror", &flags, N_("mirror all refs"),
 			    (TRANSPORT_PUSH_MIRROR|TRANSPORT_PUSH_FORCE)),
-		OPT_BOOLEAN( 0, "delete", &deleterefs, "delete refs"),
-		OPT_BOOLEAN( 0 , "tags", &tags, "push tags (can't be used with --all or --mirror)"),
-		OPT_BIT('n' , "dry-run", &flags, "dry run", TRANSPORT_PUSH_DRY_RUN),
-		OPT_BIT( 0,  "porcelain", &flags, "machine-readable output", TRANSPORT_PUSH_PORCELAIN),
-		OPT_BIT('f', "force", &flags, "force updates", TRANSPORT_PUSH_FORCE),
-		{ OPTION_CALLBACK, 0, "recurse-submodules", &flags, "check",
-			"controls recursive pushing of submodules",
+		OPT_BOOLEAN( 0, "delete", &deleterefs, N_("delete refs")),
+		OPT_BOOLEAN( 0 , "tags", &tags, N_("push tags (can't be used with --all or --mirror)")),
+		OPT_BIT('n' , "dry-run", &flags, N_("dry run"), TRANSPORT_PUSH_DRY_RUN),
+		OPT_BIT( 0,  "porcelain", &flags, N_("machine-readable output"), TRANSPORT_PUSH_PORCELAIN),
+		OPT_BIT('f', "force", &flags, N_("force updates"), TRANSPORT_PUSH_FORCE),
+		{ OPTION_CALLBACK, 0, "recurse-submodules", &flags, N_("check"),
+			N_("control recursive pushing of submodules"),
 			PARSE_OPT_OPTARG, option_parse_recurse_submodules },
-		OPT_BOOLEAN( 0 , "thin", &thin, "use thin pack"),
-		OPT_STRING( 0 , "receive-pack", &receivepack, "receive-pack", "receive pack program"),
-		OPT_STRING( 0 , "exec", &receivepack, "receive-pack", "receive pack program"),
-		OPT_BIT('u', "set-upstream", &flags, "set upstream for git pull/status",
+		OPT_BOOLEAN( 0 , "thin", &thin, N_("use thin pack")),
+		OPT_STRING( 0 , "receive-pack", &receivepack, "receive-pack", N_("receive pack program")),
+		OPT_STRING( 0 , "exec", &receivepack, "receive-pack", N_("receive pack program")),
+		OPT_BIT('u', "set-upstream", &flags, N_("set upstream for git pull/status"),
 			TRANSPORT_PUSH_SET_UPSTREAM),
-		OPT_BOOL(0, "progress", &progress, "force progress reporting"),
-		OPT_BIT(0, "prune", &flags, "prune locally removed refs",
+		OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
+		OPT_BIT(0, "prune", &flags, N_("prune locally removed refs"),
 			TRANSPORT_PUSH_PRUNE),
 		OPT_END()
 	};
diff --git a/builtin/read-tree.c b/builtin/read-tree.c
index df6c4c88..042ac1b8 100644
--- a/builtin/read-tree.c
+++ b/builtin/read-tree.c
@@ -33,7 +33,7 @@ static int list_tree(unsigned char *sha1)
 }
 
 static const char * const read_tree_usage[] = {
-	"git read-tree [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u [--exclude-per-directory=<gitignore>] | -i]] [--no-sparse-checkout] [--index-output=<file>] (--empty | <tree-ish1> [<tree-ish2> [<tree-ish3>]])",
+	N_("git read-tree [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>] [-u [--exclude-per-directory=<gitignore>] | -i]] [--no-sparse-checkout] [--index-output=<file>] (--empty | <tree-ish1> [<tree-ish2> [<tree-ish3>]])"),
 	NULL
 };
 
@@ -104,37 +104,37 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
 	struct unpack_trees_options opts;
 	int prefix_set = 0;
 	const struct option read_tree_options[] = {
-		{ OPTION_CALLBACK, 0, "index-output", NULL, "file",
-		  "write resulting index to <file>",
+		{ OPTION_CALLBACK, 0, "index-output", NULL, N_("file"),
+		  N_("write resulting index to <file>"),
 		  PARSE_OPT_NONEG, index_output_cb },
 		OPT_SET_INT(0, "empty", &read_empty,
-			    "only empty the index", 1),
-		OPT__VERBOSE(&opts.verbose_update, "be verbose"),
-		OPT_GROUP("Merging"),
+			    N_("only empty the index"), 1),
+		OPT__VERBOSE(&opts.verbose_update, N_("be verbose")),
+		OPT_GROUP(N_("Merging")),
 		OPT_SET_INT('m', NULL, &opts.merge,
-			    "perform a merge in addition to a read", 1),
+			    N_("perform a merge in addition to a read"), 1),
 		OPT_SET_INT(0, "trivial", &opts.trivial_merges_only,
-			    "3-way merge if no file level merging required", 1),
+			    N_("3-way merge if no file level merging required"), 1),
 		OPT_SET_INT(0, "aggressive", &opts.aggressive,
-			    "3-way merge in presence of adds and removes", 1),
+			    N_("3-way merge in presence of adds and removes"), 1),
 		OPT_SET_INT(0, "reset", &opts.reset,
-			    "same as -m, but discard unmerged entries", 1),
-		{ OPTION_STRING, 0, "prefix", &opts.prefix, "<subdirectory>/",
-		  "read the tree into the index under <subdirectory>/",
+			    N_("same as -m, but discard unmerged entries"), 1),
+		{ OPTION_STRING, 0, "prefix", &opts.prefix, N_("<subdirectory>/"),
+		  N_("read the tree into the index under <subdirectory>/"),
 		  PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP },
 		OPT_SET_INT('u', NULL, &opts.update,
-			    "update working tree with merge result", 1),
+			    N_("update working tree with merge result"), 1),
 		{ OPTION_CALLBACK, 0, "exclude-per-directory", &opts,
-		  "gitignore",
-		  "allow explicitly ignored files to be overwritten",
+		  N_("gitignore"),
+		  N_("allow explicitly ignored files to be overwritten"),
 		  PARSE_OPT_NONEG, exclude_per_directory_cb },
 		OPT_SET_INT('i', NULL, &opts.index_only,
-			    "don't check the working tree after merging", 1),
-		OPT__DRY_RUN(&opts.dry_run, "don't update the index or the work tree"),
+			    N_("don't check the working tree after merging"), 1),
+		OPT__DRY_RUN(&opts.dry_run, N_("don't update the index or the work tree")),
 		OPT_SET_INT(0, "no-sparse-checkout", &opts.skip_sparse_checkout,
-			    "skip applying sparse checkout filter", 1),
+			    N_("skip applying sparse checkout filter"), 1),
 		OPT_SET_INT(0, "debug-unpack", &opts.debug_unpack,
-			    "debug unpack-trees", 1),
+			    N_("debug unpack-trees"), 1),
 		OPT_END()
 	};
 
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 0afb8b28..ff781feb 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -12,6 +12,7 @@
 #include "string-list.h"
 #include "sha1-array.h"
 #include "connected.h"
+#include "version.h"
 
 static const char receive_pack_usage[] = "git receive-pack <git-dir>";
 
@@ -121,10 +122,11 @@ static void show_ref(const char *path, const unsigned char *sha1)
 	if (sent_capabilities)
 		packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
 	else
-		packet_write(1, "%s %s%c%s%s\n",
+		packet_write(1, "%s %s%c%s%s agent=%s\n",
 			     sha1_to_hex(sha1), path, 0,
 			     " report-status delete-refs side-band-64k quiet",
-			     prefer_ofs_delta ? " ofs-delta" : "");
+			     prefer_ofs_delta ? " ofs-delta" : "",
+			     git_user_agent_sanitized());
 	sent_capabilities = 1;
 }
 
@@ -478,7 +480,6 @@ static const char *update(struct command *cmd)
 	    !prefixcmp(name, "refs/heads/")) {
 		struct object *old_object, *new_object;
 		struct commit *old_commit, *new_commit;
-		struct commit_list *bases, *ent;
 
 		old_object = parse_object(old_sha1);
 		new_object = parse_object(new_sha1);
@@ -491,12 +492,7 @@ static const char *update(struct command *cmd)
 		}
 		old_commit = (struct commit *)old_object;
 		new_commit = (struct commit *)new_object;
-		bases = get_merge_bases(old_commit, new_commit, 1);
-		for (ent = bases; ent; ent = ent->next)
-			if (!hashcmp(old_sha1, ent->item->object.sha1))
-				break;
-		free_commit_list(bases);
-		if (!ent) {
+		if (!in_merge_bases(old_commit, new_commit)) {
 			rp_error("denying non-fast-forward %s"
 				 " (you should pull first)", name);
 			return "non-fast-forward";
@@ -699,7 +695,7 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
 
 	if (unpacker_error) {
 		for (cmd = commands; cmd; cmd = cmd->next)
-			cmd->error_string = "n/a (unpacker error)";
+			cmd->error_string = "unpacker error";
 		return;
 	}
 
@@ -799,7 +795,7 @@ static const char *parse_pack_header(struct pack_header *hdr)
 
 static const char *pack_lockfile;
 
-static const char *unpack(void)
+static const char *unpack(int err_fd)
 {
 	struct pack_header hdr;
 	const char *hdr_err;
@@ -819,6 +815,7 @@ static const char *unpack(void)
 
 	if (ntohl(hdr.hdr_entries) < unpack_limit) {
 		int code, i = 0;
+		struct child_process child;
 		const char *unpacker[5];
 		unpacker[i++] = "unpack-objects";
 		if (quiet)
@@ -827,7 +824,12 @@ static const char *unpack(void)
 			unpacker[i++] = "--strict";
 		unpacker[i++] = hdr_arg;
 		unpacker[i++] = NULL;
-		code = run_command_v_opt(unpacker, RUN_GIT_CMD);
+		memset(&child, 0, sizeof(child));
+		child.argv = unpacker;
+		child.no_stdout = 1;
+		child.err = err_fd;
+		child.git_cmd = 1;
+		code = run_command(&child);
 		if (!code)
 			return NULL;
 		return "unpack-objects abnormal exit";
@@ -852,6 +854,7 @@ static const char *unpack(void)
 		memset(&ip, 0, sizeof(ip));
 		ip.argv = keeper;
 		ip.out = -1;
+		ip.err = err_fd;
 		ip.git_cmd = 1;
 		status = start_command(&ip);
 		if (status) {
@@ -868,6 +871,26 @@ static const char *unpack(void)
 	}
 }
 
+static const char *unpack_with_sideband(void)
+{
+	struct async muxer;
+	const char *ret;
+
+	if (!use_sideband)
+		return unpack(0);
+
+	memset(&muxer, 0, sizeof(muxer));
+	muxer.proc = copy_to_sideband;
+	muxer.in = -1;
+	if (start_async(&muxer))
+		return NULL;
+
+	ret = unpack(muxer.in);
+
+	finish_async(&muxer);
+	return ret;
+}
+
 static void report(struct command *commands, const char *unpack_status)
 {
 	struct command *cmd;
@@ -965,7 +988,7 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 		const char *unpack_status = NULL;
 
 		if (!delete_only(commands))
-			unpack_status = unpack();
+			unpack_status = unpack_with_sideband();
 		execute_commands(commands, unpack_status);
 		if (pack_lockfile)
 			unlink_or_warn(pack_lockfile);
@@ -977,7 +1000,8 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 			const char *argv_gc_auto[] = {
 				"gc", "--auto", "--quiet", NULL,
 			};
-			run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+			int opt = RUN_GIT_CMD | RUN_COMMAND_STDOUT_TO_STDERR;
+			run_command_v_opt(argv_gc_auto, opt);
 		}
 		if (auto_update_server_info)
 			update_server_info(0);
diff --git a/builtin/reflog.c b/builtin/reflog.c
index 062d7dad..b3c9e27b 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -330,8 +330,10 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 		printf("keep %s", message);
 	return 0;
  prune:
-	if (!cb->newlog || cb->cmd->verbose)
-		printf("%sprune %s", cb->newlog ? "" : "would ", message);
+	if (!cb->newlog)
+		printf("would prune %s", message);
+	else if (cb->cmd->verbose)
+		printf("prune %s", message);
 	return 0;
 }
 
diff --git a/builtin/remote.c b/builtin/remote.c
index fec92bc6..a5a4b232 100644
--- a/builtin/remote.c
+++ b/builtin/remote.c
@@ -8,66 +8,66 @@
 #include "refs.h"
 
 static const char * const builtin_remote_usage[] = {
-	"git remote [-v | --verbose]",
-	"git remote add [-t <branch>] [-m <master>] [-f] [--mirror=<fetch|push>] <name> <url>",
-	"git remote rename <old> <new>",
-	"git remote rm <name>",
-	"git remote set-head <name> (-a | -d | <branch>)",
-	"git remote [-v | --verbose] show [-n] <name>",
-	"git remote prune [-n | --dry-run] <name>",
-	"git remote [-v | --verbose] update [-p | --prune] [(<group> | <remote>)...]",
-	"git remote set-branches [--add] <name> <branch>...",
-	"git remote set-url <name> <newurl> [<oldurl>]",
-	"git remote set-url --add <name> <newurl>",
-	"git remote set-url --delete <name> <url>",
+	N_("git remote [-v | --verbose]"),
+	N_("git remote add [-t <branch>] [-m <master>] [-f] [--tags|--no-tags] [--mirror=<fetch|push>] <name> <url>"),
+	N_("git remote rename <old> <new>"),
+	N_("git remote remove <name>"),
+	N_("git remote set-head <name> (-a | -d | <branch>)"),
+	N_("git remote [-v | --verbose] show [-n] <name>"),
+	N_("git remote prune [-n | --dry-run] <name>"),
+	N_("git remote [-v | --verbose] update [-p | --prune] [(<group> | <remote>)...]"),
+	N_("git remote set-branches [--add] <name> <branch>..."),
+	N_("git remote set-url [--push] <name> <newurl> [<oldurl>]"),
+	N_("git remote set-url --add <name> <newurl>"),
+	N_("git remote set-url --delete <name> <url>"),
 	NULL
 };
 
 static const char * const builtin_remote_add_usage[] = {
-	"git remote add [<options>] <name> <url>",
+	N_("git remote add [<options>] <name> <url>"),
 	NULL
 };
 
 static const char * const builtin_remote_rename_usage[] = {
-	"git remote rename <old> <new>",
+	N_("git remote rename <old> <new>"),
 	NULL
 };
 
 static const char * const builtin_remote_rm_usage[] = {
-	"git remote rm <name>",
+	N_("git remote remove <name>"),
 	NULL
 };
 
 static const char * const builtin_remote_sethead_usage[] = {
-	"git remote set-head <name> (-a | -d | <branch>])",
+	N_("git remote set-head <name> (-a | -d | <branch>])"),
 	NULL
 };
 
 static const char * const builtin_remote_setbranches_usage[] = {
-	"git remote set-branches <name> <branch>...",
-	"git remote set-branches --add <name> <branch>...",
+	N_("git remote set-branches <name> <branch>..."),
+	N_("git remote set-branches --add <name> <branch>..."),
 	NULL
 };
 
 static const char * const builtin_remote_show_usage[] = {
-	"git remote show [<options>] <name>",
+	N_("git remote show [<options>] <name>"),
 	NULL
 };
 
 static const char * const builtin_remote_prune_usage[] = {
-	"git remote prune [<options>] <name>",
+	N_("git remote prune [<options>] <name>"),
 	NULL
 };
 
 static const char * const builtin_remote_update_usage[] = {
-	"git remote update [<options>] [<group> | <remote>]...",
+	N_("git remote update [<options>] [<group> | <remote>]..."),
 	NULL
 };
 
 static const char * const builtin_remote_seturl_usage[] = {
-	"git remote set-url [--push] <name> <newurl> [<oldurl>]",
-	"git remote set-url --add <name> <newurl>",
-	"git remote set-url --delete <name> <url>",
+	N_("git remote set-url [--push] <name> <newurl> [<oldurl>]"),
+	N_("git remote set-url --add <name> <newurl>"),
+	N_("git remote set-url --delete <name> <url>"),
 	NULL
 };
 
@@ -95,9 +95,9 @@ static int fetch_remote(const char *name)
 		argv[1] = "-v";
 		argv[2] = name;
 	}
-	printf("Updating %s\n", name);
+	printf_ln(_("Updating %s"), name);
 	if (run_command_v_opt(argv, RUN_GIT_CMD))
-		return error("Could not fetch %s", name);
+		return error(_("Could not fetch %s"), name);
 	return 0;
 }
 
@@ -127,8 +127,8 @@ static int add_branch(const char *key, const char *branchname,
 }
 
 static const char mirror_advice[] =
-"--mirror is dangerous and deprecated; please\n"
-"\t use --mirror=fetch or --mirror=push instead";
+N_("--mirror is dangerous and deprecated; please\n"
+   "\t use --mirror=fetch or --mirror=push instead");
 
 static int parse_mirror_opt(const struct option *opt, const char *arg, int not)
 {
@@ -136,7 +136,7 @@ static int parse_mirror_opt(const struct option *opt, const char *arg, int not)
 	if (not)
 		*mirror = MIRROR_NONE;
 	else if (!arg) {
-		warning("%s", mirror_advice);
+		warning("%s", _(mirror_advice));
 		*mirror = MIRROR_BOTH;
 	}
 	else if (!strcmp(arg, "fetch"))
@@ -144,7 +144,7 @@ static int parse_mirror_opt(const struct option *opt, const char *arg, int not)
 	else if (!strcmp(arg, "push"))
 		*mirror = MIRROR_PUSH;
 	else
-		return error("unknown mirror argument: %s", arg);
+		return error(_("unknown mirror argument: %s"), arg);
 	return 0;
 }
 
@@ -160,17 +160,17 @@ static int add(int argc, const char **argv)
 	int i;
 
 	struct option options[] = {
-		OPT_BOOLEAN('f', "fetch", &fetch, "fetch the remote branches"),
+		OPT_BOOLEAN('f', "fetch", &fetch, N_("fetch the remote branches")),
 		OPT_SET_INT(0, "tags", &fetch_tags,
-			    "import all tags and associated objects when fetching",
+			    N_("import all tags and associated objects when fetching"),
 			    TAGS_SET),
 		OPT_SET_INT(0, NULL, &fetch_tags,
-			    "or do not fetch any tag at all (--no-tags)", TAGS_UNSET),
-		OPT_STRING_LIST('t', "track", &track, "branch",
-				"branch(es) to track"),
-		OPT_STRING('m', "master", &master, "branch", "master branch"),
-		{ OPTION_CALLBACK, 0, "mirror", &mirror, "push|fetch",
-			"set up remote as a mirror to push to or fetch from",
+			    N_("or do not fetch any tag at all (--no-tags)"), TAGS_UNSET),
+		OPT_STRING_LIST('t', "track", &track, N_("branch"),
+				N_("branch(es) to track")),
+		OPT_STRING('m', "master", &master, N_("branch"), N_("master branch")),
+		{ OPTION_CALLBACK, 0, "mirror", &mirror, N_("push|fetch"),
+			N_("set up remote as a mirror to push to or fetch from"),
 			PARSE_OPT_OPTARG, parse_mirror_opt },
 		OPT_END()
 	};
@@ -182,9 +182,9 @@ static int add(int argc, const char **argv)
 		usage_with_options(builtin_remote_add_usage, options);
 
 	if (mirror && master)
-		die("specifying a master branch makes no sense with --mirror");
+		die(_("specifying a master branch makes no sense with --mirror"));
 	if (mirror && !(mirror & MIRROR_FETCH) && track.nr)
-		die("specifying branches to track makes sense only with fetch mirrors");
+		die(_("specifying branches to track makes sense only with fetch mirrors"));
 
 	name = argv[0];
 	url = argv[1];
@@ -192,11 +192,11 @@ static int add(int argc, const char **argv)
 	remote = remote_get(name);
 	if (remote && (remote->url_nr > 1 || strcmp(name, remote->url[0]) ||
 			remote->fetch_refspec_nr))
-		die("remote %s already exists.", name);
+		die(_("remote %s already exists."), name);
 
 	strbuf_addf(&buf2, "refs/heads/test:refs/remotes/%s/test", name);
 	if (!valid_fetch_refspec(buf2.buf))
-		die("'%s' is not a valid remote name", name);
+		die(_("'%s' is not a valid remote name"), name);
 
 	strbuf_addf(&buf, "remote.%s.url", name);
 	if (git_config_set(buf.buf, url))
@@ -240,7 +240,7 @@ static int add(int argc, const char **argv)
 		strbuf_addf(&buf2, "refs/remotes/%s/%s", name, master);
 
 		if (create_symref(buf.buf, buf2.buf, "remote add"))
-			return error("Could not setup master '%s'", master);
+			return error(_("Could not setup master '%s'"), master);
 	}
 
 	strbuf_release(&buf);
@@ -296,7 +296,7 @@ static int config_read_branches(const char *key, const char *value, void *cb)
 		info = item->util;
 		if (type == REMOTE) {
 			if (info->remote_name)
-				warning("more than one %s", orig_key);
+				warning(_("more than one %s"), orig_key);
 			info->remote_name = xstrdup(value);
 		} else if (type == MERGE) {
 			char *space = strchr(value, ' ');
@@ -336,7 +336,7 @@ static int get_ref_states(const struct ref *remote_refs, struct ref_states *stat
 
 	for (i = 0; i < states->remote->fetch_refspec_nr; i++)
 		if (get_fetch_map(remote_refs, states->remote->fetch + i, &tail, 1))
-			die("Could not get fetch map for refspec %s",
+			die(_("Could not get fetch map for refspec %s"),
 				states->remote->fetch_refspec[i]);
 
 	states->new.strdup_strings = 1;
@@ -437,7 +437,7 @@ static int get_push_ref_states_noquery(struct ref_states *states)
 
 	states->push.strdup_strings = 1;
 	if (!remote->push_refspec_nr) {
-		item = string_list_append(&states->push, "(matching)");
+		item = string_list_append(&states->push, _("(matching)"));
 		info = item->util = xcalloc(sizeof(struct push_info), 1);
 		info->status = PUSH_STATUS_NOTQUERIED;
 		info->dest = xstrdup(item->string);
@@ -445,11 +445,11 @@ static int get_push_ref_states_noquery(struct ref_states *states)
 	for (i = 0; i < remote->push_refspec_nr; i++) {
 		struct refspec *spec = remote->push + i;
 		if (spec->matching)
-			item = string_list_append(&states->push, "(matching)");
+			item = string_list_append(&states->push, _("(matching)"));
 		else if (strlen(spec->src))
 			item = string_list_append(&states->push, spec->src);
 		else
-			item = string_list_append(&states->push, "(delete)");
+			item = string_list_append(&states->push, _("(delete)"));
 
 		info = item->util = xcalloc(sizeof(struct push_info), 1);
 		info->forced = spec->force;
@@ -592,19 +592,19 @@ static int migrate_file(struct remote *remote)
 	strbuf_addf(&buf, "remote.%s.url", remote->name);
 	for (i = 0; i < remote->url_nr; i++)
 		if (git_config_set_multivar(buf.buf, remote->url[i], "^$", 0))
-			return error("Could not append '%s' to '%s'",
+			return error(_("Could not append '%s' to '%s'"),
 					remote->url[i], buf.buf);
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.push", remote->name);
 	for (i = 0; i < remote->push_refspec_nr; i++)
 		if (git_config_set_multivar(buf.buf, remote->push_refspec[i], "^$", 0))
-			return error("Could not append '%s' to '%s'",
+			return error(_("Could not append '%s' to '%s'"),
 					remote->push_refspec[i], buf.buf);
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.fetch", remote->name);
 	for (i = 0; i < remote->fetch_refspec_nr; i++)
 		if (git_config_set_multivar(buf.buf, remote->fetch_refspec[i], "^$", 0))
-			return error("Could not append '%s' to '%s'",
+			return error(_("Could not append '%s' to '%s'"),
 					remote->fetch_refspec[i], buf.buf);
 	if (remote->origin == REMOTE_REMOTES)
 		path = git_path("remotes/%s", remote->name);
@@ -636,30 +636,30 @@ static int mv(int argc, const char **argv)
 
 	oldremote = remote_get(rename.old);
 	if (!oldremote)
-		die("No such remote: %s", rename.old);
+		die(_("No such remote: %s"), rename.old);
 
 	if (!strcmp(rename.old, rename.new) && oldremote->origin != REMOTE_CONFIG)
 		return migrate_file(oldremote);
 
 	newremote = remote_get(rename.new);
 	if (newremote && (newremote->url_nr > 1 || newremote->fetch_refspec_nr))
-		die("remote %s already exists.", rename.new);
+		die(_("remote %s already exists."), rename.new);
 
 	strbuf_addf(&buf, "refs/heads/test:refs/remotes/%s/test", rename.new);
 	if (!valid_fetch_refspec(buf.buf))
-		die("'%s' is not a valid remote name", rename.new);
+		die(_("'%s' is not a valid remote name"), rename.new);
 
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s", rename.old);
 	strbuf_addf(&buf2, "remote.%s", rename.new);
 	if (git_config_rename_section(buf.buf, buf2.buf) < 1)
-		return error("Could not rename config section '%s' to '%s'",
+		return error(_("Could not rename config section '%s' to '%s'"),
 				buf.buf, buf2.buf);
 
 	strbuf_reset(&buf);
 	strbuf_addf(&buf, "remote.%s.fetch", rename.new);
 	if (git_config_set_multivar(buf.buf, NULL, NULL, 1))
-		return error("Could not remove config section '%s'", buf.buf);
+		return error(_("Could not remove config section '%s'"), buf.buf);
 	strbuf_addf(&old_remote_context, ":refs/remotes/%s/", rename.old);
 	for (i = 0; i < oldremote->fetch_refspec_nr; i++) {
 		char *ptr;
@@ -674,13 +674,13 @@ static int mv(int argc, const char **argv)
 				      strlen(rename.old), rename.new,
 				      strlen(rename.new));
 		} else
-			warning("Not updating non-default fetch respec\n"
-				"\t%s\n"
-				"\tPlease update the configuration manually if necessary.",
+			warning(_("Not updating non-default fetch refspec\n"
+				  "\t%s\n"
+				  "\tPlease update the configuration manually if necessary."),
 				buf2.buf);
 
 		if (git_config_set_multivar(buf.buf, buf2.buf, "^$", 0))
-			return error("Could not append '%s'", buf.buf);
+			return error(_("Could not append '%s'"), buf.buf);
 	}
 
 	read_branches();
@@ -691,7 +691,7 @@ static int mv(int argc, const char **argv)
 			strbuf_reset(&buf);
 			strbuf_addf(&buf, "branch.%s.remote", item->string);
 			if (git_config_set(buf.buf, rename.new)) {
-				return error("Could not set '%s'", buf.buf);
+				return error(_("Could not set '%s'"), buf.buf);
 			}
 		}
 	}
@@ -713,7 +713,7 @@ static int mv(int argc, const char **argv)
 		if (!(flag & REF_ISSYMREF))
 			continue;
 		if (delete_ref(item->string, NULL, REF_NODEREF))
-			die("deleting '%s' failed", item->string);
+			die(_("deleting '%s' failed"), item->string);
 	}
 	for (i = 0; i < remote_branches.nr; i++) {
 		struct string_list_item *item = remote_branches.items + i;
@@ -728,7 +728,7 @@ static int mv(int argc, const char **argv)
 		strbuf_addf(&buf2, "remote: renamed %s to %s",
 				item->string, buf.buf);
 		if (rename_ref(item->string, buf.buf, buf2.buf))
-			die("renaming '%s' failed", item->string);
+			die(_("renaming '%s' failed"), item->string);
 	}
 	for (i = 0; i < remote_branches.nr; i++) {
 		struct string_list_item *item = remote_branches.items + i;
@@ -747,7 +747,7 @@ static int mv(int argc, const char **argv)
 		strbuf_addf(&buf3, "remote: renamed %s to %s",
 				item->string, buf.buf);
 		if (create_symref(buf.buf, buf2.buf, buf3.buf))
-			die("creating '%s' failed", buf.buf);
+			die(_("creating '%s' failed"), buf.buf);
 	}
 	return 0;
 }
@@ -761,7 +761,7 @@ static int remove_branches(struct string_list *branches)
 		unsigned char *sha1 = item->util;
 
 		if (delete_ref(refname, sha1, 0))
-			result |= error("Could not remove branch %s", refname);
+			result |= error(_("Could not remove branch %s"), refname);
 	}
 	return result;
 }
@@ -789,14 +789,14 @@ static int rm(int argc, const char **argv)
 
 	remote = remote_get(argv[1]);
 	if (!remote)
-		die("No such remote: %s", argv[1]);
+		die(_("No such remote: %s"), argv[1]);
 
 	known_remotes.to_delete = remote;
 	for_each_remote(add_known_remote, &known_remotes);
 
 	strbuf_addf(&buf, "remote.%s", remote->name);
 	if (git_config_rename_section(buf.buf, NULL) < 1)
-		return error("Could not remove config section '%s'", buf.buf);
+		return error(_("Could not remove config section '%s'"), buf.buf);
 
 	read_branches();
 	for (i = 0; i < branch_list.nr; i++) {
@@ -830,11 +830,12 @@ static int rm(int argc, const char **argv)
 	string_list_clear(&branches, 1);
 
 	if (skipped.nr) {
-		fprintf(stderr, skipped.nr == 1 ?
-			"Note: A branch outside the refs/remotes/ hierarchy was not removed;\n"
-			"to delete it, use:\n" :
-			"Note: Some branches outside the refs/remotes/ hierarchy were not removed;\n"
-			"to delete them, use:\n");
+		fprintf_ln(stderr,
+			   Q_("Note: A branch outside the refs/remotes/ hierarchy was not removed;\n"
+			      "to delete it, use:",
+			      "Note: Some branches outside the refs/remotes/ hierarchy were not removed;\n"
+			      "to delete them, use:",
+			      skipped.nr));
 		for (i = 0; i < skipped.nr; i++)
 			fprintf(stderr, "  git branch -d %s\n",
 				skipped.items[i].string);
@@ -886,7 +887,7 @@ static int get_remote_ref_states(const char *name,
 
 	states->remote = remote_get(name);
 	if (!states->remote)
-		return error("No such remote: %s", name);
+		return error(_("No such remote: %s"), name);
 
 	read_branches();
 
@@ -939,14 +940,14 @@ static int show_remote_info_item(struct string_list_item *item, void *cb_data)
 		const char *fmt = "%s";
 		const char *arg = "";
 		if (string_list_has_string(&states->new, name)) {
-			fmt = " new (next fetch will store in remotes/%s)";
+			fmt = _(" new (next fetch will store in remotes/%s)");
 			arg = states->remote->name;
 		} else if (string_list_has_string(&states->tracked, name))
-			arg = " tracked";
+			arg = _(" tracked");
 		else if (string_list_has_string(&states->stale, name))
-			arg = " stale (use 'git remote prune' to remove)";
+			arg = _(" stale (use 'git remote prune' to remove)");
 		else
-			arg = " ???";
+			arg = _(" ???");
 		printf("    %-*s", info->width, name);
 		printf(fmt, arg);
 		printf("\n");
@@ -987,21 +988,21 @@ static int show_local_info_item(struct string_list_item *item, void *cb_data)
 	int i;
 
 	if (branch_info->rebase && branch_info->merge.nr > 1) {
-		error("invalid branch.%s.merge; cannot rebase onto > 1 branch",
+		error(_("invalid branch.%s.merge; cannot rebase onto > 1 branch"),
 			item->string);
 		return 0;
 	}
 
 	printf("    %-*s ", show_info->width, item->string);
 	if (branch_info->rebase) {
-		printf("rebases onto remote %s\n", merge->items[0].string);
+		printf_ln(_("rebases onto remote %s"), merge->items[0].string);
 		return 0;
 	} else if (show_info->any_rebase) {
-		printf(" merges with remote %s\n", merge->items[0].string);
-		also = "    and with remote";
+		printf_ln(_(" merges with remote %s"), merge->items[0].string);
+		also = _("    and with remote");
 	} else {
-		printf("merges with remote %s\n", merge->items[0].string);
-		also = "   and with remote";
+		printf_ln(_("merges with remote %s"), merge->items[0].string);
+		also = _("   and with remote");
 	}
 	for (i = 1; i < merge->nr; i++)
 		printf("    %-*s %s %s\n", show_info->width, "", also,
@@ -1043,36 +1044,43 @@ static int show_push_info_item(struct string_list_item *item, void *cb_data)
 {
 	struct show_info *show_info = cb_data;
 	struct push_info *push_info = item->util;
-	char *src = item->string, *status = NULL;
+	const char *src = item->string, *status = NULL;
 
 	switch (push_info->status) {
 	case PUSH_STATUS_CREATE:
-		status = "create";
+		status = _("create");
 		break;
 	case PUSH_STATUS_DELETE:
-		status = "delete";
-		src = "(none)";
+		status = _("delete");
+		src = _("(none)");
 		break;
 	case PUSH_STATUS_UPTODATE:
-		status = "up to date";
+		status = _("up to date");
 		break;
 	case PUSH_STATUS_FASTFORWARD:
-		status = "fast-forwardable";
+		status = _("fast-forwardable");
 		break;
 	case PUSH_STATUS_OUTOFDATE:
-		status = "local out of date";
+		status = _("local out of date");
 		break;
 	case PUSH_STATUS_NOTQUERIED:
 		break;
 	}
-	if (status)
-		printf("    %-*s %s to %-*s (%s)\n", show_info->width, src,
-			push_info->forced ? "forces" : "pushes",
-			show_info->width2, push_info->dest, status);
-	else
-		printf("    %-*s %s to %s\n", show_info->width, src,
-			push_info->forced ? "forces" : "pushes",
-			push_info->dest);
+	if (status) {
+		if (push_info->forced)
+			printf_ln(_("    %-*s forces to %-*s (%s)"), show_info->width, src,
+			       show_info->width2, push_info->dest, status);
+		else
+			printf_ln(_("    %-*s pushes to %-*s (%s)"), show_info->width, src,
+			       show_info->width2, push_info->dest, status);
+	} else {
+		if (push_info->forced)
+			printf_ln(_("    %-*s forces to %s"), show_info->width, src,
+			       push_info->dest);
+		else
+			printf_ln(_("    %-*s pushes to %s"), show_info->width, src,
+			       push_info->dest);
+	}
 	return 0;
 }
 
@@ -1080,7 +1088,7 @@ static int show(int argc, const char **argv)
 {
 	int no_query = 0, result = 0, query_flag = 0;
 	struct option options[] = {
-		OPT_BOOLEAN('n', NULL, &no_query, "do not query remotes"),
+		OPT_BOOLEAN('n', NULL, &no_query, N_("do not query remotes")),
 		OPT_END()
 	};
 	struct ref_states states;
@@ -1107,9 +1115,9 @@ static int show(int argc, const char **argv)
 
 		get_remote_ref_states(*argv, &states, query_flag);
 
-		printf("* remote %s\n", *argv);
-		printf("  Fetch URL: %s\n", states.remote->url_nr > 0 ?
-			states.remote->url[0] : "(no URL)");
+		printf_ln(_("* remote %s"), *argv);
+		printf_ln(_("  Fetch URL: %s"), states.remote->url_nr > 0 ?
+		       states.remote->url[0] : _("(no URL)"));
 		if (states.remote->pushurl_nr) {
 			url = states.remote->pushurl;
 			url_nr = states.remote->pushurl_nr;
@@ -1118,18 +1126,18 @@ static int show(int argc, const char **argv)
 			url_nr = states.remote->url_nr;
 		}
 		for (i = 0; i < url_nr; i++)
-			printf("  Push  URL: %s\n", url[i]);
+			printf_ln(_("  Push  URL: %s"), url[i]);
 		if (!i)
-			printf("  Push  URL: %s\n", "(no URL)");
+			printf_ln(_("  Push  URL: %s"), "(no URL)");
 		if (no_query)
-			printf("  HEAD branch: (not queried)\n");
+			printf_ln(_("  HEAD branch: %s"), "(not queried)");
 		else if (!states.heads.nr)
-			printf("  HEAD branch: (unknown)\n");
+			printf_ln(_("  HEAD branch: %s"), "(unknown)");
 		else if (states.heads.nr == 1)
-			printf("  HEAD branch: %s\n", states.heads.items[0].string);
+			printf_ln(_("  HEAD branch: %s"), states.heads.items[0].string);
 		else {
-			printf("  HEAD branch (remote HEAD is ambiguous,"
-			       " may be one of the following):\n");
+			printf(_("  HEAD branch (remote HEAD is ambiguous,"
+				 " may be one of the following):\n"));
 			for (i = 0; i < states.heads.nr; i++)
 				printf("    %s\n", states.heads.items[i].string);
 		}
@@ -1140,9 +1148,10 @@ static int show(int argc, const char **argv)
 		for_each_string_list(&states.tracked, add_remote_to_show_info, &info);
 		for_each_string_list(&states.stale, add_remote_to_show_info, &info);
 		if (info.list->nr)
-			printf("  Remote branch%s:%s\n",
-			       info.list->nr > 1 ? "es" : "",
-				no_query ? " (status not queried)" : "");
+			printf_ln(Q_("  Remote branch:%s",
+				     "  Remote branches:%s",
+				     info.list->nr),
+				  no_query ? _(" (status not queried)") : "");
 		for_each_string_list(info.list, show_remote_info_item, &info);
 		string_list_clear(info.list, 0);
 
@@ -1151,23 +1160,25 @@ static int show(int argc, const char **argv)
 		info.any_rebase = 0;
 		for_each_string_list(&branch_list, add_local_to_show_info, &info);
 		if (info.list->nr)
-			printf("  Local branch%s configured for 'git pull':\n",
-			       info.list->nr > 1 ? "es" : "");
+			printf_ln(Q_("  Local branch configured for 'git pull':",
+				     "  Local branches configured for 'git pull':",
+				     info.list->nr));
 		for_each_string_list(info.list, show_local_info_item, &info);
 		string_list_clear(info.list, 0);
 
 		/* git push info */
 		if (states.remote->mirror)
-			printf("  Local refs will be mirrored by 'git push'\n");
+			printf_ln(_("  Local refs will be mirrored by 'git push'"));
 
 		info.width = info.width2 = 0;
 		for_each_string_list(&states.push, add_push_to_show_info, &info);
 		qsort(info.list->items, info.list->nr,
 			sizeof(*info.list->items), cmp_string_with_push);
 		if (info.list->nr)
-			printf("  Local ref%s configured for 'git push'%s:\n",
-				info.list->nr > 1 ? "s" : "",
-				no_query ? " (status not queried)" : "");
+			printf_ln(Q_("  Local ref configured for 'git push'%s:",
+				     "  Local refs configured for 'git push'%s:",
+				     info.list->nr),
+				  no_query ? _(" (status not queried)") : "");
 		for_each_string_list(info.list, show_push_info_item, &info);
 		string_list_clear(info.list, 0);
 
@@ -1185,9 +1196,9 @@ static int set_head(int argc, const char **argv)
 
 	struct option options[] = {
 		OPT_BOOLEAN('a', "auto", &opt_a,
-			    "set refs/remotes/<name>/HEAD according to remote"),
+			    N_("set refs/remotes/<name>/HEAD according to remote")),
 		OPT_BOOLEAN('d', "delete", &opt_d,
-			    "delete refs/remotes/<name>/HEAD"),
+			    N_("delete refs/remotes/<name>/HEAD")),
 		OPT_END()
 	};
 	argc = parse_options(argc, argv, NULL, options, builtin_remote_sethead_usage,
@@ -1202,10 +1213,10 @@ static int set_head(int argc, const char **argv)
 		memset(&states, 0, sizeof(states));
 		get_remote_ref_states(argv[0], &states, GET_HEAD_NAMES);
 		if (!states.heads.nr)
-			result |= error("Cannot determine remote HEAD");
+			result |= error(_("Cannot determine remote HEAD"));
 		else if (states.heads.nr > 1) {
-			result |= error("Multiple remote HEAD branches. "
-					"Please choose one explicitly with:");
+			result |= error(_("Multiple remote HEAD branches. "
+					  "Please choose one explicitly with:"));
 			for (i = 0; i < states.heads.nr; i++)
 				fprintf(stderr, "  git remote set-head %s %s\n",
 					argv[0], states.heads.items[i].string);
@@ -1214,7 +1225,7 @@ static int set_head(int argc, const char **argv)
 		free_remote_ref_states(&states);
 	} else if (opt_d && !opt_a && argc == 1) {
 		if (delete_ref(buf.buf, NULL, REF_NODEREF))
-			result |= error("Could not delete %s", buf.buf);
+			result |= error(_("Could not delete %s"), buf.buf);
 	} else
 		usage_with_options(builtin_remote_sethead_usage, options);
 
@@ -1222,9 +1233,9 @@ static int set_head(int argc, const char **argv)
 		strbuf_addf(&buf2, "refs/remotes/%s/%s", argv[0], head_name);
 		/* make sure it's valid */
 		if (!ref_exists(buf2.buf))
-			result |= error("Not a valid ref: %s", buf2.buf);
+			result |= error(_("Not a valid ref: %s"), buf2.buf);
 		else if (create_symref(buf.buf, buf2.buf, "remote set-head"))
-			result |= error("Could not setup %s", buf.buf);
+			result |= error(_("Could not setup %s"), buf.buf);
 		if (opt_a)
 			printf("%s/HEAD set to %s\n", argv[0], head_name);
 		free(head_name);
@@ -1239,7 +1250,7 @@ static int prune(int argc, const char **argv)
 {
 	int dry_run = 0, result = 0;
 	struct option options[] = {
-		OPT__DRY_RUN(&dry_run, "dry run"),
+		OPT__DRY_RUN(&dry_run, N_("dry run")),
 		OPT_END()
 	};
 
@@ -1260,18 +1271,18 @@ static int prune_remote(const char *remote, int dry_run)
 	int result = 0, i;
 	struct ref_states states;
 	const char *dangling_msg = dry_run
-		? " %s will become dangling!\n"
-		: " %s has become dangling!\n";
+		? _(" %s will become dangling!")
+		: _(" %s has become dangling!");
 
 	memset(&states, 0, sizeof(states));
 	get_remote_ref_states(remote, &states, GET_REF_STATES);
 
 	if (states.stale.nr) {
-		printf("Pruning %s\n", remote);
-		printf("URL: %s\n",
+		printf_ln(_("Pruning %s"), remote);
+		printf_ln(_("URL: %s"),
 		       states.remote->url_nr
 		       ? states.remote->url[0]
-		       : "(no URL)");
+		       : _("(no URL)"));
 	}
 
 	for (i = 0; i < states.stale.nr; i++) {
@@ -1280,8 +1291,12 @@ static int prune_remote(const char *remote, int dry_run)
 		if (!dry_run)
 			result |= delete_ref(refname, NULL, 0);
 
-		printf(" * [%s] %s\n", dry_run ? "would prune" : "pruned",
-		       abbrev_ref(refname, "refs/remotes/"));
+		if (dry_run)
+			printf_ln(_(" * [would prune] %s"),
+			       abbrev_ref(refname, "refs/remotes/"));
+		else
+			printf_ln(_(" * [pruned] %s"),
+			       abbrev_ref(refname, "refs/remotes/"));
 		warn_dangling_symref(stdout, dangling_msg, refname);
 	}
 
@@ -1303,7 +1318,7 @@ static int update(int argc, const char **argv)
 	int i, prune = 0;
 	struct option options[] = {
 		OPT_BOOLEAN('p', "prune", &prune,
-			    "prune remotes after fetching"),
+			    N_("prune remotes after fetching")),
 		OPT_END()
 	};
 	const char **fetch_argv;
@@ -1369,7 +1384,7 @@ static int set_remote_branches(const char *remotename, const char **branches,
 	strbuf_addf(&key, "remote.%s.fetch", remotename);
 
 	if (!remote_is_configured(remotename))
-		die("No such remote '%s'", remotename);
+		die(_("No such remote '%s'"), remotename);
 	remote = remote_get(remotename);
 
 	if (!add_mode && remove_all_fetch_refspecs(remotename, key.buf)) {
@@ -1389,14 +1404,14 @@ static int set_branches(int argc, const char **argv)
 {
 	int add_mode = 0;
 	struct option options[] = {
-		OPT_BOOLEAN('\0', "add", &add_mode, "add branch"),
+		OPT_BOOLEAN('\0', "add", &add_mode, N_("add branch")),
 		OPT_END()
 	};
 
 	argc = parse_options(argc, argv, NULL, options,
 			     builtin_remote_setbranches_usage, 0);
 	if (argc == 0) {
-		error("no remote specified");
+		error(_("no remote specified"));
 		usage_with_options(builtin_remote_setbranches_usage, options);
 	}
 	argv[argc] = NULL;
@@ -1418,18 +1433,18 @@ static int set_url(int argc, const char **argv)
 	struct strbuf name_buf = STRBUF_INIT;
 	struct option options[] = {
 		OPT_BOOLEAN('\0', "push", &push_mode,
-			    "manipulate push URLs"),
+			    N_("manipulate push URLs")),
 		OPT_BOOLEAN('\0', "add", &add_mode,
-			    "add URL"),
+			    N_("add URL")),
 		OPT_BOOLEAN('\0', "delete", &delete_mode,
-			    "delete URLs"),
+			    N_("delete URLs")),
 		OPT_END()
 	};
 	argc = parse_options(argc, argv, NULL, options, builtin_remote_seturl_usage,
 			     PARSE_OPT_KEEP_ARGV0);
 
 	if (add_mode && delete_mode)
-		die("--add --delete doesn't make sense");
+		die(_("--add --delete doesn't make sense"));
 
 	if (argc < 3 || argc > 4 || ((add_mode || delete_mode) && argc != 3))
 		usage_with_options(builtin_remote_seturl_usage, options);
@@ -1443,7 +1458,7 @@ static int set_url(int argc, const char **argv)
 		oldurl = newurl;
 
 	if (!remote_is_configured(remotename))
-		die("No such remote '%s'", remotename);
+		die(_("No such remote '%s'"), remotename);
 	remote = remote_get(remotename);
 
 	if (push_mode) {
@@ -1469,7 +1484,7 @@ static int set_url(int argc, const char **argv)
 
 	/* Old URL specified. Demand that one matches. */
 	if (regcomp(&old_regex, oldurl, REG_EXTENDED))
-		die("Invalid old URL pattern: %s", oldurl);
+		die(_("Invalid old URL pattern: %s"), oldurl);
 
 	for (i = 0; i < urlset_nr; i++)
 		if (!regexec(&old_regex, urlset[i], 0, NULL, 0))
@@ -1477,9 +1492,9 @@ static int set_url(int argc, const char **argv)
 		else
 			negative_matches++;
 	if (!delete_mode && !matches)
-		die("No such URL found: %s", oldurl);
+		die(_("No such URL found: %s"), oldurl);
 	if (delete_mode && !negative_matches && !push_mode)
-		die("Will not delete all non-push URLs");
+		die(_("Will not delete all non-push URLs"));
 
 	regfree(&old_regex);
 
@@ -1551,7 +1566,7 @@ static int show_all(void)
 int cmd_remote(int argc, const char **argv, const char *prefix)
 {
 	struct option options[] = {
-		OPT__VERBOSE(&verbose, "be verbose; must be placed before a subcommand"),
+		OPT__VERBOSE(&verbose, N_("be verbose; must be placed before a subcommand")),
 		OPT_END()
 	};
 	int result;
@@ -1565,7 +1580,7 @@ int cmd_remote(int argc, const char **argv, const char *prefix)
 		result = add(argc, argv);
 	else if (!strcmp(argv[0], "rename"))
 		result = mv(argc, argv);
-	else if (!strcmp(argv[0], "rm"))
+	else if (!strcmp(argv[0], "rm") || !strcmp(argv[0], "remove"))
 		result = rm(argc, argv);
 	else if (!strcmp(argv[0], "set-head"))
 		result = set_head(argc, argv);
@@ -1580,7 +1595,7 @@ int cmd_remote(int argc, const char **argv, const char *prefix)
 	else if (!strcmp(argv[0], "update"))
 		result = update(argc, argv);
 	else {
-		error("Unknown subcommand: %s", argv[0]);
+		error(_("Unknown subcommand: %s"), argv[0]);
 		usage_with_options(builtin_remote_usage, options);
 	}
 
diff --git a/builtin/replace.c b/builtin/replace.c
index 4a8970e9..e3aaf702 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -14,9 +14,9 @@
 #include "parse-options.h"
 
 static const char * const git_replace_usage[] = {
-	"git replace [-f] <object> <replacement>",
-	"git replace -d <object>...",
-	"git replace -l [<pattern>]",
+	N_("git replace [-f] <object> <replacement>"),
+	N_("git replace -d <object>..."),
+	N_("git replace -l [<pattern>]"),
 	NULL
 };
 
@@ -115,9 +115,9 @@ int cmd_replace(int argc, const char **argv, const char *prefix)
 {
 	int list = 0, delete = 0, force = 0;
 	struct option options[] = {
-		OPT_BOOLEAN('l', NULL, &list, "list replace refs"),
-		OPT_BOOLEAN('d', NULL, &delete, "delete replace refs"),
-		OPT_BOOLEAN('f', NULL, &force, "replace the ref if it exists"),
+		OPT_BOOLEAN('l', NULL, &list, N_("list replace refs")),
+		OPT_BOOLEAN('d', NULL, &delete, N_("delete replace refs")),
+		OPT_BOOLEAN('f', NULL, &force, N_("replace the ref if it exists")),
 		OPT_END()
 	};
 
diff --git a/builtin/rerere.c b/builtin/rerere.c
index 08213c7c..dc1708e6 100644
--- a/builtin/rerere.c
+++ b/builtin/rerere.c
@@ -8,7 +8,7 @@
 #include "xdiff-interface.h"
 
 static const char * const rerere_usage[] = {
-	"git rerere [clear | forget path... | status | remaining | diff | gc]",
+	N_("git rerere [clear | forget path... | status | remaining | diff | gc]"),
 	NULL,
 };
 
@@ -53,7 +53,7 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
 
 	struct option options[] = {
 		OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
-			"register clean resolutions in index", 1),
+			N_("register clean resolutions in index"), 1),
 		OPT_END(),
 	};
 
diff --git a/builtin/reset.c b/builtin/reset.c
index 8c2c1d52..915cc9f8 100644
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -22,9 +22,9 @@
 #include "cache-tree.h"
 
 static const char * const git_reset_usage[] = {
-	"git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]",
-	"git reset [-q] <commit> [--] <paths>...",
-	"git reset --patch [<commit>] [--] [<paths>...]",
+	N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
+	N_("git reset [-q] <commit> [--] <paths>..."),
+	N_("git reset --patch [<commit>] [--] [<paths>...]"),
 	NULL
 };
 
@@ -235,17 +235,17 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 	struct commit *commit;
 	struct strbuf msg = STRBUF_INIT;
 	const struct option options[] = {
-		OPT__QUIET(&quiet, "be quiet, only report errors"),
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
 		OPT_SET_INT(0, "mixed", &reset_type,
-						"reset HEAD and index", MIXED),
-		OPT_SET_INT(0, "soft", &reset_type, "reset only HEAD", SOFT),
+						N_("reset HEAD and index"), MIXED),
+		OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
 		OPT_SET_INT(0, "hard", &reset_type,
-				"reset HEAD, index and working tree", HARD),
+				N_("reset HEAD, index and working tree"), HARD),
 		OPT_SET_INT(0, "merge", &reset_type,
-				"reset HEAD, index and working tree", MERGE),
+				N_("reset HEAD, index and working tree"), MERGE),
 		OPT_SET_INT(0, "keep", &reset_type,
-				"reset HEAD but keep local changes", KEEP),
-		OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"),
+				N_("reset HEAD but keep local changes"), KEEP),
+		OPT_BOOLEAN('p', "patch", &patch_mode, N_("select hunks interactively")),
 		OPT_END()
 	};
 
@@ -276,7 +276,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 		 * Otherwise, argv[i] could be either <rev> or <paths> and
 		 * has to be unambiguous.
 		 */
-		else if (!get_sha1(argv[i], sha1)) {
+		else if (!get_sha1_committish(argv[i], sha1)) {
 			/*
 			 * Ok, argv[i] looks like a rev; it should not
 			 * be a filename.
@@ -285,13 +285,19 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
 			rev = argv[i++];
 		} else {
 			/* Otherwise we treat this as a filename */
-			verify_filename(prefix, argv[i]);
+			verify_filename(prefix, argv[i], 1);
 		}
 	}
 
-	if (get_sha1(rev, sha1))
+	if (get_sha1_committish(rev, sha1))
 		die(_("Failed to resolve '%s' as a valid ref."), rev);
 
+	/*
+	 * NOTE: As "git reset $treeish -- $path" should be usable on
+	 * any tree-ish, this is not strictly correct. We are not
+	 * moving the HEAD to any commit; we are merely resetting the
+	 * entries in the index to that of a treeish.
+	 */
 	commit = lookup_commit_reference(sha1);
 	if (!commit)
 		die(_("Could not parse object '%s'."), rev);
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 733f626f..f267a1d3 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -195,6 +195,12 @@ static int anti_reference(const char *refname, const unsigned char *sha1, int fl
 	return 0;
 }
 
+static int show_abbrev(const unsigned char *sha1, void *cb_data)
+{
+	show_rev(NORMAL, sha1, NULL);
+	return 0;
+}
+
 static void show_datestring(const char *flag, const char *datestr)
 {
 	static char buffer[100];
@@ -224,6 +230,7 @@ static int try_difference(const char *arg)
 	const char *next;
 	const char *this;
 	int symmetric;
+	static const char head_by_default[] = "HEAD";
 
 	if (!(dotdot = strstr(arg, "..")))
 		return 0;
@@ -235,10 +242,21 @@ static int try_difference(const char *arg)
 	next += symmetric;
 
 	if (!*next)
-		next = "HEAD";
+		next = head_by_default;
 	if (dotdot == arg)
-		this = "HEAD";
-	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
+		this = head_by_default;
+
+	if (this == head_by_default && next == head_by_default &&
+	    !symmetric) {
+		/*
+		 * Just ".."?  That is not a range but the
+		 * pathspec for the parent directory.
+		 */
+		*dotdot = '.';
+		return 0;
+	}
+
+	if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 		show_rev(NORMAL, end, next);
 		show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 		if (symmetric) {
@@ -278,7 +296,7 @@ static int try_parent_shorthands(const char *arg)
 		return 0;
 
 	*dotdot = 0;
-	if (get_sha1(arg, sha1))
+	if (get_sha1_committish(arg, sha1))
 		return 0;
 
 	if (!parents_only)
@@ -318,15 +336,15 @@ static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 {
 	static int keep_dashdash = 0, stop_at_non_option = 0;
 	static char const * const parseopt_usage[] = {
-		"git rev-parse --parseopt [options] -- [<args>...]",
+		N_("git rev-parse --parseopt [options] -- [<args>...]"),
 		NULL
 	};
 	static struct option parseopt_opts[] = {
 		OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
-					"keep the `--` passed as an arg"),
+					N_("keep the `--` passed as an arg")),
 		OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
-					"stop parsing after the "
-					"first non-option argument"),
+					N_("stop parsing after the "
+					   "first non-option argument")),
 		OPT_END(),
 	};
 
@@ -443,11 +461,11 @@ static void die_no_single_rev(int quiet)
 }
 
 static const char builtin_rev_parse_usage[] =
-"git rev-parse --parseopt [options] -- [<args>...]\n"
-"   or: git rev-parse --sq-quote [<arg>...]\n"
-"   or: git rev-parse [options] [<arg>...]\n"
-"\n"
-"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
+N_("git rev-parse --parseopt [options] -- [<args>...]\n"
+   "   or: git rev-parse --sq-quote [<arg>...]\n"
+   "   or: git rev-parse [options] [<arg>...]\n"
+   "\n"
+   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 
 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 {
@@ -486,7 +504,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 
 		if (as_is) {
 			if (show_file(arg) && as_is < 2)
-				verify_filename(prefix, arg);
+				verify_filename(prefix, arg, 0);
 			continue;
 		}
 		if (!strcmp(arg,"-n")) {
@@ -589,6 +607,10 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				for_each_ref(show_reference, NULL);
 				continue;
 			}
+			if (!prefixcmp(arg, "--disambiguate=")) {
+				for_each_abbrev(arg + 15, show_abbrev, NULL);
+				continue;
+			}
 			if (!strcmp(arg, "--bisect")) {
 				for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 				for_each_ref_in("refs/bisect/good", anti_reference, NULL);
@@ -734,7 +756,7 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 		as_is = 1;
 		if (!show_file(arg))
 			continue;
-		verify_filename(prefix, arg);
+		verify_filename(prefix, arg, 1);
 	}
 	if (verify) {
 		if (revs_count == 1) {
diff --git a/builtin/revert.c b/builtin/revert.c
index 5462e676..c5e36b94 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -19,14 +19,14 @@
  */
 
 static const char * const revert_usage[] = {
-	"git revert [options] <commit-ish>",
-	"git revert <subcommand>",
+	N_("git revert [options] <commit-ish>"),
+	N_("git revert <subcommand>"),
 	NULL
 };
 
 static const char * const cherry_pick_usage[] = {
-	"git cherry-pick [options] <commit-ish>",
-	"git cherry-pick <subcommand>",
+	N_("git cherry-pick [options] <commit-ish>"),
+	N_("git cherry-pick <subcommand>"),
 	NULL
 };
 
@@ -100,18 +100,21 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 	int contin = 0;
 	int rollback = 0;
 	struct option options[] = {
-		OPT_BOOLEAN(0, "quit", &remove_state, "end revert or cherry-pick sequence"),
-		OPT_BOOLEAN(0, "continue", &contin, "resume revert or cherry-pick sequence"),
-		OPT_BOOLEAN(0, "abort", &rollback, "cancel revert or cherry-pick sequence"),
-		OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
-		OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
+		OPT_BOOLEAN(0, "quit", &remove_state, N_("end revert or cherry-pick sequence")),
+		OPT_BOOLEAN(0, "continue", &contin, N_("resume revert or cherry-pick sequence")),
+		OPT_BOOLEAN(0, "abort", &rollback, N_("cancel revert or cherry-pick sequence")),
+		OPT_BOOLEAN('n', "no-commit", &opts->no_commit, N_("don't automatically commit")),
+		OPT_BOOLEAN('e', "edit", &opts->edit, N_("edit the commit message")),
 		OPT_NOOP_NOARG('r', NULL),
-		OPT_BOOLEAN('s', "signoff", &opts->signoff, "add Signed-off-by:"),
-		OPT_INTEGER('m', "mainline", &opts->mainline, "parent number"),
+		OPT_BOOLEAN('s', "signoff", &opts->signoff, N_("add Signed-off-by:")),
+		OPT_INTEGER('m', "mainline", &opts->mainline, N_("parent number")),
 		OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
-		OPT_STRING(0, "strategy", &opts->strategy, "strategy", "merge strategy"),
-		OPT_CALLBACK('X', "strategy-option", &opts, "option",
-			"option for merge strategy", option_parse_x),
+		OPT_STRING(0, "strategy", &opts->strategy, N_("strategy"), N_("merge strategy")),
+		OPT_CALLBACK('X', "strategy-option", &opts, N_("option"),
+			N_("option for merge strategy"), option_parse_x),
+		OPT_END(),
+		OPT_END(),
+		OPT_END(),
 		OPT_END(),
 		OPT_END(),
 		OPT_END(),
@@ -119,8 +122,11 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 
 	if (opts->action == REPLAY_PICK) {
 		struct option cp_extra[] = {
-			OPT_BOOLEAN('x', NULL, &opts->record_origin, "append commit name"),
-			OPT_BOOLEAN(0, "ff", &opts->allow_ff, "allow fast-forward"),
+			OPT_BOOLEAN('x', NULL, &opts->record_origin, N_("append commit name")),
+			OPT_BOOLEAN(0, "ff", &opts->allow_ff, N_("allow fast-forward")),
+			OPT_BOOLEAN(0, "allow-empty", &opts->allow_empty, N_("preserve initially empty commits")),
+			OPT_BOOLEAN(0, "allow-empty-message", &opts->allow_empty_message, N_("allow commits with empty messages")),
+			OPT_BOOLEAN(0, "keep-redundant-commits", &opts->keep_redundant_commits, N_("keep redundant, empty commits")),
 			OPT_END(),
 		};
 		if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
@@ -138,6 +144,10 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 				"--abort", rollback,
 				NULL);
 
+	/* implies allow_empty */
+	if (opts->keep_redundant_commits)
+		opts->allow_empty = 1;
+
 	/* Set the subcommand */
 	if (remove_state)
 		opts->subcommand = REPLAY_REMOVE_STATE;
@@ -185,7 +195,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 		struct setup_revision_opt s_r_opt;
 		opts->revs = xmalloc(sizeof(*opts->revs));
 		init_revisions(opts->revs, NULL);
-		opts->revs->no_walk = 1;
+		opts->revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
 		if (argc < 2)
 			usage_with_options(usage_str, options);
 		memset(&s_r_opt, 0, sizeof(s_r_opt));
diff --git a/builtin/rm.c b/builtin/rm.c
index 90c8a504..b384c4c3 100644
--- a/builtin/rm.c
+++ b/builtin/rm.c
@@ -11,7 +11,7 @@
 #include "parse-options.h"
 
 static const char * const builtin_rm_usage[] = {
-	"git rm [options] [--] <file>...",
+	N_("git rm [options] [--] <file>..."),
 	NULL
 };
 
@@ -130,13 +130,13 @@ static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
 static int ignore_unmatch = 0;
 
 static struct option builtin_rm_options[] = {
-	OPT__DRY_RUN(&show_only, "dry run"),
-	OPT__QUIET(&quiet, "do not list removed files"),
-	OPT_BOOLEAN( 0 , "cached",         &index_only, "only remove from the index"),
-	OPT__FORCE(&force, "override the up-to-date check"),
-	OPT_BOOLEAN('r', NULL,             &recursive,  "allow recursive removal"),
+	OPT__DRY_RUN(&show_only, N_("dry run")),
+	OPT__QUIET(&quiet, N_("do not list removed files")),
+	OPT_BOOLEAN( 0 , "cached",         &index_only, N_("only remove from the index")),
+	OPT__FORCE(&force, N_("override the up-to-date check")),
+	OPT_BOOLEAN('r', NULL,             &recursive,  N_("allow recursive removal")),
 	OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
-				"exit with a zero status even if nothing matched"),
+				N_("exit with a zero status even if nothing matched")),
 	OPT_END(),
 };
 
diff --git a/builtin/send-pack.c b/builtin/send-pack.c
index d5d7105b..7d050642 100644
--- a/builtin/send-pack.c
+++ b/builtin/send-pack.c
@@ -8,6 +8,7 @@
 #include "send-pack.h"
 #include "quote.h"
 #include "transport.h"
+#include "version.h"
 
 static const char send_pack_usage[] =
 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
@@ -251,6 +252,7 @@ int send_pack(struct send_pack_args *args,
 	int status_report = 0;
 	int use_sideband = 0;
 	int quiet_supported = 0;
+	int agent_supported = 0;
 	unsigned cmds_sent = 0;
 	int ret;
 	struct async demux;
@@ -266,6 +268,8 @@ int send_pack(struct send_pack_args *args,
 		use_sideband = 1;
 	if (server_supports("quiet"))
 		quiet_supported = 1;
+	if (server_supports("agent"))
+		agent_supported = 1;
 
 	if (!remote_refs) {
 		fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
@@ -305,12 +309,17 @@ int send_pack(struct send_pack_args *args,
 			char *new_hex = sha1_to_hex(ref->new_sha1);
 			int quiet = quiet_supported && (args->quiet || !args->progress);
 
-			if (!cmds_sent && (status_report || use_sideband || args->quiet)) {
-				packet_buf_write(&req_buf, "%s %s %s%c%s%s%s",
+			if (!cmds_sent && (status_report || use_sideband ||
+					   quiet || agent_supported)) {
+				packet_buf_write(&req_buf,
+						 "%s %s %s%c%s%s%s%s%s",
 						 old_hex, new_hex, ref->name, 0,
 						 status_report ? " report-status" : "",
 						 use_sideband ? " side-band-64k" : "",
-						 quiet ? " quiet" : "");
+						 quiet ? " quiet" : "",
+						 agent_supported ? " agent=" : "",
+						 agent_supported ? git_user_agent_sanitized() : ""
+						);
 			}
 			else
 				packet_buf_write(&req_buf, "%s %s %s",
diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index 37f3193a..b316cf37 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -10,9 +10,9 @@
 #include "parse-options.h"
 
 static char const * const shortlog_usage[] = {
-	"git shortlog [-n] [-s] [-e] [-w] [rev-opts] [--] [<commit-id>... ]",
+	N_("git shortlog [-n] [-s] [-e] [-w] [rev-opts] [--] [<commit-id>... ]"),
 	"",
-	"[rev-opts] are documented in git-rev-list(1)",
+	N_("[rev-opts] are documented in git-rev-list(1)"),
 	NULL
 };
 
@@ -250,13 +250,13 @@ int cmd_shortlog(int argc, const char **argv, const char *prefix)
 
 	static const struct option options[] = {
 		OPT_BOOLEAN('n', "numbered", &log.sort_by_number,
-			    "sort output according to the number of commits per author"),
+			    N_("sort output according to the number of commits per author")),
 		OPT_BOOLEAN('s', "summary", &log.summary,
-			    "Suppress commit descriptions, only provides commit count"),
+			    N_("Suppress commit descriptions, only provides commit count")),
 		OPT_BOOLEAN('e', "email", &log.email,
-			    "Show the email address of each author"),
-		{ OPTION_CALLBACK, 'w', NULL, &log, "w[,i1[,i2]]",
-			"Linewrap output", PARSE_OPT_OPTARG, &parse_wrap_args },
+			    N_("Show the email address of each author")),
+		{ OPTION_CALLBACK, 'w', NULL, &log, N_("w[,i1[,i2]]"),
+			N_("Linewrap output"), PARSE_OPT_OPTARG, &parse_wrap_args },
 		OPT_END(),
 	};
 
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index a59e088c..d208fd6c 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -6,8 +6,8 @@
 #include "parse-options.h"
 
 static const char* show_branch_usage[] = {
-    "git show-branch [-a|--all] [-r|--remotes] [--topo-order | --date-order] [--current] [--color[=<when>] | --no-color] [--sparse] [--more=<n> | --list | --independent | --merge-base] [--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]",
-    "git show-branch (-g|--reflog)[=<n>[,<base>]] [--list] [<ref>]",
+    N_("git show-branch [-a|--all] [-r|--remotes] [--topo-order | --date-order] [--current] [--color[=<when>] | --no-color] [--sparse] [--more=<n> | --list | --independent | --merge-base] [--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]"),
+    N_("git show-branch (-g|--reflog)[=<n>[,<base>]] [--list] [<ref>]"),
     NULL
 };
 
@@ -648,36 +648,36 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 	const char *reflog_base = NULL;
 	struct option builtin_show_branch_options[] = {
 		OPT_BOOLEAN('a', "all", &all_heads,
-			    "show remote-tracking and local branches"),
+			    N_("show remote-tracking and local branches")),
 		OPT_BOOLEAN('r', "remotes", &all_remotes,
-			    "show remote-tracking branches"),
+			    N_("show remote-tracking branches")),
 		OPT__COLOR(&showbranch_use_color,
-			    "color '*!+-' corresponding to the branch"),
-		{ OPTION_INTEGER, 0, "more", &extra, "n",
-			    "show <n> more commits after the common ancestor",
+			    N_("color '*!+-' corresponding to the branch")),
+		{ OPTION_INTEGER, 0, "more", &extra, N_("n"),
+			    N_("show <n> more commits after the common ancestor"),
 			    PARSE_OPT_OPTARG, NULL, (intptr_t)1 },
-		OPT_SET_INT(0, "list", &extra, "synonym to more=-1", -1),
-		OPT_BOOLEAN(0, "no-name", &no_name, "suppress naming strings"),
+		OPT_SET_INT(0, "list", &extra, N_("synonym to more=-1"), -1),
+		OPT_BOOLEAN(0, "no-name", &no_name, N_("suppress naming strings")),
 		OPT_BOOLEAN(0, "current", &with_current_branch,
-			    "include the current branch"),
+			    N_("include the current branch")),
 		OPT_BOOLEAN(0, "sha1-name", &sha1_name,
-			    "name commits with their object names"),
+			    N_("name commits with their object names")),
 		OPT_BOOLEAN(0, "merge-base", &merge_base,
-			    "show possible merge bases"),
+			    N_("show possible merge bases")),
 		OPT_BOOLEAN(0, "independent", &independent,
-			    "show refs unreachable from any other ref"),
+			    N_("show refs unreachable from any other ref")),
 		OPT_BOOLEAN(0, "topo-order", &lifo,
-			    "show commits in topological order"),
+			    N_("show commits in topological order")),
 		OPT_BOOLEAN(0, "topics", &topics,
-			    "show only commits not on the first branch"),
+			    N_("show only commits not on the first branch")),
 		OPT_SET_INT(0, "sparse", &dense,
-			    "show merges reachable from only one tip", 0),
+			    N_("show merges reachable from only one tip"), 0),
 		OPT_SET_INT(0, "date-order", &lifo,
-			    "show commits where no parent comes before its "
-			    "children", 0),
-		{ OPTION_CALLBACK, 'g', "reflog", &reflog_base, "<n>[,<base>]",
-			    "show <n> most recent ref-log entries starting at "
-			    "base",
+			    N_("show commits where no parent comes before its "
+			       "children"), 0),
+		{ OPTION_CALLBACK, 'g', "reflog", &reflog_base, N_("<n>[,<base>]"),
+			    N_("show <n> most recent ref-log entries starting at "
+			       "base"),
 			    PARSE_OPT_OPTARG | PARSE_OPT_LITERAL_ARGHELP,
 			    parse_reflog_param },
 		OPT_END()
diff --git a/builtin/show-ref.c b/builtin/show-ref.c
index 39116619..4eb016d6 100644
--- a/builtin/show-ref.c
+++ b/builtin/show-ref.c
@@ -7,8 +7,8 @@
 #include "parse-options.h"
 
 static const char * const show_ref_usage[] = {
-	"git show-ref [-q|--quiet] [--verify] [--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] ",
-	"git show-ref --exclude-existing[=pattern] < ref-list",
+	N_("git show-ref [-q|--quiet] [--verify] [--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] "),
+	N_("git show-ref --exclude-existing[=pattern] < ref-list"),
 	NULL
 };
 
@@ -179,26 +179,26 @@ static int help_callback(const struct option *opt, const char *arg, int unset)
 }
 
 static const struct option show_ref_options[] = {
-	OPT_BOOLEAN(0, "tags", &tags_only, "only show tags (can be combined with heads)"),
-	OPT_BOOLEAN(0, "heads", &heads_only, "only show heads (can be combined with tags)"),
-	OPT_BOOLEAN(0, "verify", &verify, "stricter reference checking, "
-		    "requires exact ref path"),
+	OPT_BOOLEAN(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
+	OPT_BOOLEAN(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
+	OPT_BOOLEAN(0, "verify", &verify, N_("stricter reference checking, "
+		    "requires exact ref path")),
 	{ OPTION_BOOLEAN, 'h', NULL, &show_head, NULL,
-	  "show the HEAD reference",
+	  N_("show the HEAD reference"),
 	  PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
-	OPT_BOOLEAN(0, "head", &show_head, "show the HEAD reference"),
+	OPT_BOOLEAN(0, "head", &show_head, N_("show the HEAD reference")),
 	OPT_BOOLEAN('d', "dereference", &deref_tags,
-		    "dereference tags into object IDs"),
-	{ OPTION_CALLBACK, 's', "hash", &abbrev, "n",
-	  "only show SHA1 hash using <n> digits",
+		    N_("dereference tags into object IDs")),
+	{ OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
+	  N_("only show SHA1 hash using <n> digits"),
 	  PARSE_OPT_OPTARG, &hash_callback },
 	OPT__ABBREV(&abbrev),
 	OPT__QUIET(&quiet,
-		   "do not print results to stdout (useful with --verify)"),
+		   N_("do not print results to stdout (useful with --verify)")),
 	{ OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
-	  "pattern", "show refs from stdin that aren't in local repository",
+	  N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 	  PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
-	{ OPTION_CALLBACK, 0, "help-all", NULL, NULL, "show usage",
+	{ OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
 	  PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 	OPT_END()
 };
diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c
index 801d62ec..9e92828b 100644
--- a/builtin/symbolic-ref.c
+++ b/builtin/symbolic-ref.c
@@ -4,7 +4,7 @@
 #include "parse-options.h"
 
 static const char * const git_symbolic_ref_usage[] = {
-	"git symbolic-ref [options] name [ref]",
+	N_("git symbolic-ref [options] name [ref]"),
 	NULL
 };
 
@@ -35,9 +35,9 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
 	const char *msg = NULL;
 	struct option options[] = {
 		OPT__QUIET(&quiet,
-			"suppress error message for non-symbolic (detached) refs"),
-		OPT_BOOL(0, "short", &shorten, "shorten ref output"),
-		OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
+			N_("suppress error message for non-symbolic (detached) refs")),
+		OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
+		OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
 		OPT_END(),
 	};
 
diff --git a/builtin/tag.c b/builtin/tag.c
index fe7e5e5b..9c3e0673 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -16,13 +16,14 @@
 #include "revision.h"
 #include "gpg-interface.h"
 #include "sha1-array.h"
+#include "column.h"
 
 static const char * const git_tag_usage[] = {
-	"git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]",
-	"git tag -d <tagname>...",
-	"git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
-		"\n\t\t[<pattern>...]",
-	"git tag -v <tagname>...",
+	N_("git tag [-a|-s|-u <key-id>] [-f] [-m <msg>|-F <file>] <tagname> [<head>]"),
+	N_("git tag -d <tagname>..."),
+	N_("git tag -l [-n[<num>]] [--contains <commit>] [--points-at <object>] "
+		"\n\t\t[<pattern>...]"),
+	N_("git tag -v <tagname>..."),
 	NULL
 };
 
@@ -33,6 +34,7 @@ struct tag_filter {
 };
 
 static struct sha1_array points_at;
+static unsigned int colopts;
 
 static int match_pattern(const char **patterns, const char *ref)
 {
@@ -263,6 +265,8 @@ static int git_tag_config(const char *var, const char *value, void *cb)
 	int status = git_gpg_config(var, value, cb);
 	if (status)
 		return status;
+	if (!prefixcmp(var, "column."))
+		return git_column_config(var, value, "tag", &colopts);
 	return git_default_config(var, value, cb);
 }
 
@@ -328,7 +332,7 @@ static void create_tag(const unsigned char *object, const char *tag,
 			  sha1_to_hex(object),
 			  typename(type),
 			  tag,
-			  git_committer_info(IDENT_ERROR_ON_NO_NAME));
+			  git_committer_info(IDENT_STRICT));
 
 	if (header_len > sizeof(header_buf) - 1)
 		die(_("tag header too big."));
@@ -440,36 +444,37 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	struct msg_arg msg = { 0, STRBUF_INIT };
 	struct commit_list *with_commit = NULL;
 	struct option options[] = {
-		OPT_BOOLEAN('l', "list", &list, "list tag names"),
-		{ OPTION_INTEGER, 'n', NULL, &lines, "n",
-				"print <n> lines of each tag message",
+		OPT_BOOLEAN('l', "list", &list, N_("list tag names")),
+		{ OPTION_INTEGER, 'n', NULL, &lines, N_("n"),
+				N_("print <n> lines of each tag message"),
 				PARSE_OPT_OPTARG, NULL, 1 },
-		OPT_BOOLEAN('d', "delete", &delete, "delete tags"),
-		OPT_BOOLEAN('v', "verify", &verify, "verify tags"),
+		OPT_BOOLEAN('d', "delete", &delete, N_("delete tags")),
+		OPT_BOOLEAN('v', "verify", &verify, N_("verify tags")),
 
-		OPT_GROUP("Tag creation options"),
+		OPT_GROUP(N_("Tag creation options")),
 		OPT_BOOLEAN('a', "annotate", &annotate,
-					"annotated tag, needs a message"),
-		OPT_CALLBACK('m', "message", &msg, "message",
-			     "tag message", parse_msg_arg),
-		OPT_FILENAME('F', "file", &msgfile, "read message from file"),
-		OPT_BOOLEAN('s', "sign", &opt.sign, "annotated and GPG-signed tag"),
-		OPT_STRING(0, "cleanup", &cleanup_arg, "mode",
-			"how to strip spaces and #comments from message"),
-		OPT_STRING('u', "local-user", &keyid, "key-id",
-					"use another key to sign the tag"),
-		OPT__FORCE(&force, "replace the tag if exists"),
-
-		OPT_GROUP("Tag listing options"),
+					N_("annotated tag, needs a message")),
+		OPT_CALLBACK('m', "message", &msg, N_("message"),
+			     N_("tag message"), parse_msg_arg),
+		OPT_FILENAME('F', "file", &msgfile, N_("read message from file")),
+		OPT_BOOLEAN('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
+		OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
+			N_("how to strip spaces and #comments from message")),
+		OPT_STRING('u', "local-user", &keyid, N_("key id"),
+					N_("use another key to sign the tag")),
+		OPT__FORCE(&force, N_("replace the tag if exists")),
+		OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),
+
+		OPT_GROUP(N_("Tag listing options")),
 		{
-			OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
-			"print only tags that contain the commit",
+			OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
+			N_("print only tags that contain the commit"),
 			PARSE_OPT_LASTARG_DEFAULT,
 			parse_opt_with_commit, (intptr_t)"HEAD",
 		},
 		{
-			OPTION_CALLBACK, 0, "points-at", NULL, "object",
-			"print only tags of the object", 0, parse_opt_points_at
+			OPTION_CALLBACK, 0, "points-at", NULL, N_("object"),
+			N_("print only tags of the object"), 0, parse_opt_points_at
 		},
 		OPT_END()
 	};
@@ -495,9 +500,25 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 
 	if (list + delete + verify > 1)
 		usage_with_options(git_tag_usage, options);
-	if (list)
-		return list_tags(argv, lines == -1 ? 0 : lines,
-				 with_commit);
+	finalize_colopts(&colopts, -1);
+	if (list && lines != -1) {
+		if (explicitly_enable_column(colopts))
+			die(_("--column and -n are incompatible"));
+		colopts = 0;
+	}
+	if (list) {
+		int ret;
+		if (column_active(colopts)) {
+			struct column_options copts;
+			memset(&copts, 0, sizeof(copts));
+			copts.padding = 2;
+			run_column_filter(colopts, &copts);
+		}
+		ret = list_tags(argv, lines == -1 ? 0 : lines, with_commit);
+		if (column_active(colopts))
+			stop_column_filter();
+		return ret;
+	}
 	if (lines != -1)
 		die(_("-n option is only allowed with -l."));
 	if (with_commit)
diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 14e04e67..2217d7b3 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c
@@ -107,7 +107,7 @@ static void *get_data(unsigned long size)
 		if (stream.total_out == size && ret == Z_STREAM_END)
 			break;
 		if (ret != Z_OK) {
-			error("inflate returned %d\n", ret);
+			error("inflate returned %d", ret);
 			free(buf);
 			buf = NULL;
 			if (!recover)
diff --git a/builtin/update-index.c b/builtin/update-index.c
index a6a23fa1..74986bf1 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -95,7 +95,8 @@ static int add_one_path(struct cache_entry *old, const char *path, int len, stru
 	size = cache_entry_size(len);
 	ce = xcalloc(1, size);
 	memcpy(ce->name, path, len);
-	ce->ce_flags = len;
+	ce->ce_flags = create_ce_flags(0);
+	ce->ce_namelen = len;
 	fill_stat_cache_info(ce, st);
 	ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
 
@@ -211,12 +212,6 @@ static int process_path(const char *path)
 	if (S_ISDIR(st.st_mode))
 		return process_directory(path, len, &st);
 
-	/*
-	 * Process a regular file
-	 */
-	if (ce && S_ISGITLINK(ce->ce_mode))
-		return error("%s is already a gitlink, not replacing", path);
-
 	return add_one_path(ce, path, len, &st);
 }
 
@@ -235,7 +230,8 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 
 	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, path, len);
-	ce->ce_flags = create_ce_flags(len, stage);
+	ce->ce_flags = create_ce_flags(stage);
+	ce->ce_namelen = len;
 	ce->ce_mode = create_ce_mode(mode);
 	if (assume_unchanged)
 		ce->ce_flags |= CE_VALID;
@@ -402,7 +398,7 @@ static void read_index_info(int line_termination)
 }
 
 static const char * const update_index_usage[] = {
-	"git update-index [options] [--] [<file>...]",
+	N_("git update-index [options] [--] [<file>...]"),
 	NULL
 };
 
@@ -433,7 +429,8 @@ static struct cache_entry *read_one_ent(const char *which,
 
 	hashcpy(ce->sha1, sha1);
 	memcpy(ce->name, path, namelen);
-	ce->ce_flags = create_ce_flags(namelen, stage);
+	ce->ce_flags = create_ce_flags(stage);
+	ce->ce_namelen = namelen;
 	ce->ce_mode = create_ce_mode(mode);
 	return ce;
 }
@@ -708,6 +705,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 	int newfd, entries, has_errors = 0, line_termination = '\n';
 	int read_from_stdin = 0;
 	int prefix_length = prefix ? strlen(prefix) : 0;
+	int preferred_index_format = 0;
 	char set_executable_bit = 0;
 	struct refresh_params refresh_args = {0, &has_errors};
 	int lock_error = 0;
@@ -716,81 +714,83 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 	int parseopt_state = PARSE_OPT_UNKNOWN;
 	struct option options[] = {
 		OPT_BIT('q', NULL, &refresh_args.flags,
-			"continue refresh even when index needs update",
+			N_("continue refresh even when index needs update"),
 			REFRESH_QUIET),
 		OPT_BIT(0, "ignore-submodules", &refresh_args.flags,
-			"refresh: ignore submodules",
+			N_("refresh: ignore submodules"),
 			REFRESH_IGNORE_SUBMODULES),
 		OPT_SET_INT(0, "add", &allow_add,
-			"do not ignore new files", 1),
+			N_("do not ignore new files"), 1),
 		OPT_SET_INT(0, "replace", &allow_replace,
-			"let files replace directories and vice-versa", 1),
+			N_("let files replace directories and vice-versa"), 1),
 		OPT_SET_INT(0, "remove", &allow_remove,
-			"notice files missing from worktree", 1),
+			N_("notice files missing from worktree"), 1),
 		OPT_BIT(0, "unmerged", &refresh_args.flags,
-			"refresh even if index contains unmerged entries",
+			N_("refresh even if index contains unmerged entries"),
 			REFRESH_UNMERGED),
 		{OPTION_CALLBACK, 0, "refresh", &refresh_args, NULL,
-			"refresh stat information",
+			N_("refresh stat information"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
 			refresh_callback},
 		{OPTION_CALLBACK, 0, "really-refresh", &refresh_args, NULL,
-			"like --refresh, but ignore assume-unchanged setting",
+			N_("like --refresh, but ignore assume-unchanged setting"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
 			really_refresh_callback},
 		{OPTION_LOWLEVEL_CALLBACK, 0, "cacheinfo", NULL,
-			"<mode> <object> <path>",
-			"add the specified entry to the index",
+			N_("<mode> <object> <path>"),
+			N_("add the specified entry to the index"),
 			PARSE_OPT_NOARG |	/* disallow --cacheinfo=<mode> form */
 			PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP,
 			(parse_opt_cb *) cacheinfo_callback},
-		{OPTION_CALLBACK, 0, "chmod", &set_executable_bit, "(+/-)x",
-			"override the executable bit of the listed files",
+		{OPTION_CALLBACK, 0, "chmod", &set_executable_bit, N_("(+/-)x"),
+			N_("override the executable bit of the listed files"),
 			PARSE_OPT_NONEG | PARSE_OPT_LITERAL_ARGHELP,
 			chmod_callback},
 		{OPTION_SET_INT, 0, "assume-unchanged", &mark_valid_only, NULL,
-			"mark files as \"not changing\"",
+			N_("mark files as \"not changing\""),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, MARK_FLAG},
 		{OPTION_SET_INT, 0, "no-assume-unchanged", &mark_valid_only, NULL,
-			"clear assumed-unchanged bit",
+			N_("clear assumed-unchanged bit"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, UNMARK_FLAG},
 		{OPTION_SET_INT, 0, "skip-worktree", &mark_skip_worktree_only, NULL,
-			"mark files as \"index-only\"",
+			N_("mark files as \"index-only\""),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, MARK_FLAG},
 		{OPTION_SET_INT, 0, "no-skip-worktree", &mark_skip_worktree_only, NULL,
-			"clear skip-worktree bit",
+			N_("clear skip-worktree bit"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, UNMARK_FLAG},
 		OPT_SET_INT(0, "info-only", &info_only,
-			"add to index only; do not add content to object database", 1),
+			N_("add to index only; do not add content to object database"), 1),
 		OPT_SET_INT(0, "force-remove", &force_remove,
-			"remove named paths even if present in worktree", 1),
+			N_("remove named paths even if present in worktree"), 1),
 		OPT_SET_INT('z', NULL, &line_termination,
-			"with --stdin: input lines are terminated by null bytes", '\0'),
+			N_("with --stdin: input lines are terminated by null bytes"), '\0'),
 		{OPTION_LOWLEVEL_CALLBACK, 0, "stdin", &read_from_stdin, NULL,
-			"read list of paths to be updated from standard input",
+			N_("read list of paths to be updated from standard input"),
 			PARSE_OPT_NONEG | PARSE_OPT_NOARG,
 			(parse_opt_cb *) stdin_callback},
 		{OPTION_LOWLEVEL_CALLBACK, 0, "index-info", &line_termination, NULL,
-			"add entries from standard input to the index",
+			N_("add entries from standard input to the index"),
 			PARSE_OPT_NONEG | PARSE_OPT_NOARG,
 			(parse_opt_cb *) stdin_cacheinfo_callback},
 		{OPTION_LOWLEVEL_CALLBACK, 0, "unresolve", &has_errors, NULL,
-			"repopulate stages #2 and #3 for the listed paths",
+			N_("repopulate stages #2 and #3 for the listed paths"),
 			PARSE_OPT_NONEG | PARSE_OPT_NOARG,
 			(parse_opt_cb *) unresolve_callback},
 		{OPTION_LOWLEVEL_CALLBACK, 'g', "again", &has_errors, NULL,
-			"only update entries that differ from HEAD",
+			N_("only update entries that differ from HEAD"),
 			PARSE_OPT_NONEG | PARSE_OPT_NOARG,
 			(parse_opt_cb *) reupdate_callback},
 		OPT_BIT(0, "ignore-missing", &refresh_args.flags,
-			"ignore files missing from worktree",
+			N_("ignore files missing from worktree"),
 			REFRESH_IGNORE_MISSING),
 		OPT_SET_INT(0, "verbose", &verbose,
-			"report actions to standard output", 1),
+			N_("report actions to standard output"), 1),
 		{OPTION_CALLBACK, 0, "clear-resolve-undo", NULL, NULL,
-			"(for porcelains) forget saved unresolved conflicts",
+			N_("(for porcelains) forget saved unresolved conflicts"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG,
 			resolve_undo_clear_callback},
+		OPT_INTEGER(0, "index-version", &preferred_index_format,
+			N_("write index in this format")),
 		OPT_END()
 	};
 
@@ -851,6 +851,17 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 		}
 	}
 	argc = parse_options_end(&ctx);
+	if (preferred_index_format) {
+		if (preferred_index_format < INDEX_FORMAT_LB ||
+		    INDEX_FORMAT_UB < preferred_index_format)
+			die("index-version %d not in range: %d..%d",
+			    preferred_index_format,
+			    INDEX_FORMAT_LB, INDEX_FORMAT_UB);
+
+		if (the_index.version != preferred_index_format)
+			active_cache_changed = 1;
+		the_index.version = preferred_index_format;
+	}
 
 	if (read_from_stdin) {
 		struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 835c62ab..51d26848 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -4,8 +4,8 @@
 #include "parse-options.h"
 
 static const char * const git_update_ref_usage[] = {
-	"git update-ref [options] -d <refname> [<oldval>]",
-	"git update-ref [options]    <refname> <newval> [<oldval>]",
+	N_("git update-ref [options] -d <refname> [<oldval>]"),
+	N_("git update-ref [options]    <refname> <newval> [<oldval>]"),
 	NULL
 };
 
@@ -15,10 +15,10 @@ int cmd_update_ref(int argc, const char **argv, const char *prefix)
 	unsigned char sha1[20], oldsha1[20];
 	int delete = 0, no_deref = 0, flags = 0;
 	struct option options[] = {
-		OPT_STRING( 'm', NULL, &msg, "reason", "reason of the update"),
-		OPT_BOOLEAN('d', NULL, &delete, "deletes the reference"),
+		OPT_STRING( 'm', NULL, &msg, N_("reason"), N_("reason of the update")),
+		OPT_BOOLEAN('d', NULL, &delete, N_("delete the reference")),
 		OPT_BOOLEAN( 0 , "no-deref", &no_deref,
-					"update <refname> not the one it points to"),
+					N_("update <refname> not the one it points to")),
 		OPT_END(),
 	};
 
diff --git a/builtin/update-server-info.c b/builtin/update-server-info.c
index b90dce63..6c8cc3ed 100644
--- a/builtin/update-server-info.c
+++ b/builtin/update-server-info.c
@@ -3,7 +3,7 @@
 #include "parse-options.h"
 
 static const char * const update_server_info_usage[] = {
-	"git update-server-info [--force]",
+	N_("git update-server-info [--force]"),
 	NULL
 };
 
@@ -11,10 +11,11 @@ int cmd_update_server_info(int argc, const char **argv, const char *prefix)
 {
 	int force = 0;
 	struct option options[] = {
-		OPT__FORCE(&force, "update the info files from scratch"),
+		OPT__FORCE(&force, N_("update the info files from scratch")),
 		OPT_END()
 	};
 
+	git_config(git_default_config, NULL);
 	argc = parse_options(argc, argv, prefix, options,
 			     update_server_info_usage, 0);
 	if (argc > 0)
diff --git a/builtin/var.c b/builtin/var.c
index 99d068a5..aedbb53a 100644
--- a/builtin/var.c
+++ b/builtin/var.c
@@ -11,7 +11,7 @@ static const char *editor(int flag)
 {
 	const char *pgm = git_editor();
 
-	if (!pgm && flag & IDENT_ERROR_ON_NO_NAME)
+	if (!pgm && flag & IDENT_STRICT)
 		die("Terminal is dumb, but EDITOR unset");
 
 	return pgm;
@@ -55,7 +55,7 @@ static const char *read_var(const char *var)
 	val = NULL;
 	for (ptr = git_vars; ptr->read; ptr++) {
 		if (strcmp(var, ptr->name) == 0) {
-			val = ptr->read(IDENT_ERROR_ON_NO_NAME);
+			val = ptr->read(IDENT_STRICT);
 			break;
 		}
 	}
diff --git a/builtin/verify-pack.c b/builtin/verify-pack.c
index e841b4a3..66cd2df0 100644
--- a/builtin/verify-pack.c
+++ b/builtin/verify-pack.c
@@ -53,7 +53,7 @@ static int verify_one_pack(const char *path, unsigned int flags)
 }
 
 static const char * const verify_pack_usage[] = {
-	"git verify-pack [-v|--verbose] [-s|--stat-only] <pack>...",
+	N_("git verify-pack [-v|--verbose] [-s|--stat-only] <pack>..."),
 	NULL
 };
 
@@ -63,9 +63,9 @@ int cmd_verify_pack(int argc, const char **argv, const char *prefix)
 	unsigned int flags = 0;
 	int i;
 	const struct option verify_pack_options[] = {
-		OPT_BIT('v', "verbose", &flags, "verbose",
+		OPT_BIT('v', "verbose", &flags, N_("verbose"),
 			VERIFY_PACK_VERBOSE),
-		OPT_BIT('s', "stat-only", &flags, "show statistics only",
+		OPT_BIT('s', "stat-only", &flags, N_("show statistics only"),
 			VERIFY_PACK_STAT_ONLY),
 		OPT_END()
 	};
diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
index 986789f7..a8eee886 100644
--- a/builtin/verify-tag.c
+++ b/builtin/verify-tag.c
@@ -14,7 +14,7 @@
 #include "gpg-interface.h"
 
 static const char * const verify_tag_usage[] = {
-		"git verify-tag [-v|--verbose] <tag>...",
+		N_("git verify-tag [-v|--verbose] <tag>..."),
 		NULL
 };
 
@@ -70,7 +70,7 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
 {
 	int i = 1, verbose = 0, had_error = 0;
 	const struct option verify_tag_options[] = {
-		OPT__VERBOSE(&verbose, "print tag contents"),
+		OPT__VERBOSE(&verbose, N_("print tag contents")),
 		OPT_END()
 	};
 
diff --git a/builtin/write-tree.c b/builtin/write-tree.c
index b223af41..084c0df7 100644
--- a/builtin/write-tree.c
+++ b/builtin/write-tree.c
@@ -10,7 +10,7 @@
 #include "parse-options.h"
 
 static const char * const write_tree_usage[] = {
-	"git write-tree [--missing-ok] [--prefix=<prefix>/]",
+	N_("git write-tree [--missing-ok] [--prefix=<prefix>/]"),
 	NULL
 };
 
@@ -21,13 +21,13 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
 	unsigned char sha1[20];
 	const char *me = "git-write-tree";
 	struct option write_tree_options[] = {
-		OPT_BIT(0, "missing-ok", &flags, "allow missing objects",
+		OPT_BIT(0, "missing-ok", &flags, N_("allow missing objects"),
 			WRITE_TREE_MISSING_OK),
-		{ OPTION_STRING, 0, "prefix", &prefix, "<prefix>/",
-		  "write tree object for a subdirectory <prefix>" ,
+		{ OPTION_STRING, 0, "prefix", &prefix, N_("<prefix>/"),
+		  N_("write tree object for a subdirectory <prefix>") ,
 		  PARSE_OPT_LITERAL_ARGHELP },
 		{ OPTION_BIT, 0, "ignore-cache-tree", &flags, NULL,
-		  "only useful for debugging",
+		  N_("only useful for debugging"),
 		  PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, NULL,
 		  WRITE_TREE_IGNORE_CACHE_TREE },
 		OPT_END()