diff options
Diffstat (limited to 'archive.c')
| -rw-r--r-- | archive.c | 396 |
1 files changed, 396 insertions, 0 deletions
diff --git a/archive.c b/archive.c new file mode 100644 index 0000000..d700af3 --- /dev/null +++ b/archive.c @@ -0,0 +1,396 @@ +#include "cache.h" +#include "commit.h" +#include "tree-walk.h" +#include "attr.h" +#include "archive.h" +#include "parse-options.h" +#include "unpack-trees.h" + +static char const * const archive_usage[] = { + "git archive [options] <tree-ish> [path...]", + "git archive --list", + "git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [path...]", + "git archive --remote <repo> [--exec <cmd>] --list", + NULL +}; + +#define USES_ZLIB_COMPRESSION 1 + +static const struct archiver { + const char *name; + write_archive_fn_t write_archive; + unsigned int flags; +} archivers[] = { + { "tar", write_tar_archive }, + { "zip", write_zip_archive, USES_ZLIB_COMPRESSION }, +}; + +static void format_subst(const struct commit *commit, + const char *src, size_t len, + struct strbuf *buf) +{ + char *to_free = NULL; + struct strbuf fmt = STRBUF_INIT; + struct pretty_print_context ctx = {0}; + ctx.date_mode = DATE_NORMAL; + + if (src == buf->buf) + to_free = strbuf_detach(buf, NULL); + for (;;) { + const char *b, *c; + + b = memmem(src, len, "$Format:", 8); + if (!b) + break; + c = memchr(b + 8, '$', (src + len) - b - 8); + if (!c) + break; + + strbuf_reset(&fmt); + strbuf_add(&fmt, b + 8, c - b - 8); + + strbuf_add(buf, src, b - src); + format_commit_message(commit, fmt.buf, buf, &ctx); + len -= c + 1 - src; + src = c + 1; + } + strbuf_add(buf, src, len); + strbuf_release(&fmt); + free(to_free); +} + +static void *sha1_file_to_archive(const char *path, const unsigned char *sha1, + unsigned int mode, enum object_type *type, + unsigned long *sizep, const struct commit *commit) +{ + void *buffer; + + buffer = read_sha1_file(sha1, type, sizep); + if (buffer && S_ISREG(mode)) { + struct strbuf buf = STRBUF_INIT; + size_t size = 0; + + strbuf_attach(&buf, buffer, *sizep, *sizep + 1); + convert_to_working_tree(path, buf.buf, buf.len, &buf); + if (commit) + format_subst(commit, buf.buf, buf.len, &buf); + buffer = strbuf_detach(&buf, &size); + *sizep = size; + } + + return buffer; +} + +static void setup_archive_check(struct git_attr_check *check) +{ + static struct git_attr *attr_export_ignore; + static struct git_attr *attr_export_subst; + + if (!attr_export_ignore) { + attr_export_ignore = git_attr("export-ignore"); + attr_export_subst = git_attr("export-subst"); + } + check[0].attr = attr_export_ignore; + check[1].attr = attr_export_subst; +} + +struct archiver_context { + struct archiver_args *args; + write_archive_entry_fn_t write_entry; +}; + +static int write_archive_entry(const unsigned char *sha1, const char *base, + int baselen, const char *filename, unsigned mode, int stage, + void *context) +{ + static struct strbuf path = STRBUF_INIT; + struct archiver_context *c = context; + struct archiver_args *args = c->args; + write_archive_entry_fn_t write_entry = c->write_entry; + struct git_attr_check check[2]; + const char *path_without_prefix; + int convert = 0; + int err; + enum object_type type; + unsigned long size; + void *buffer; + + strbuf_reset(&path); + strbuf_grow(&path, PATH_MAX); + strbuf_add(&path, args->base, args->baselen); + strbuf_add(&path, base, baselen); + strbuf_addstr(&path, filename); + path_without_prefix = path.buf + args->baselen; + + setup_archive_check(check); + if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) { + if (ATTR_TRUE(check[0].value)) + return 0; + convert = ATTR_TRUE(check[1].value); + } + + if (S_ISDIR(mode) || S_ISGITLINK(mode)) { + strbuf_addch(&path, '/'); + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)path.len, path.buf); + err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0); + if (err) + return err; + return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0); + } + + buffer = sha1_file_to_archive(path_without_prefix, sha1, mode, + &type, &size, convert ? args->commit : NULL); + if (!buffer) + return error("cannot read %s", sha1_to_hex(sha1)); + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)path.len, path.buf); + err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size); + free(buffer); + return err; +} + +int write_archive_entries(struct archiver_args *args, + write_archive_entry_fn_t write_entry) +{ + struct archiver_context context; + struct unpack_trees_options opts; + struct tree_desc t; + int err; + + if (args->baselen > 0 && args->base[args->baselen - 1] == '/') { + size_t len = args->baselen; + + while (len > 1 && args->base[len - 2] == '/') + len--; + if (args->verbose) + fprintf(stderr, "%.*s\n", (int)len, args->base); + err = write_entry(args, args->tree->object.sha1, args->base, + len, 040777, NULL, 0); + if (err) + return err; + } + + context.args = args; + context.write_entry = write_entry; + + /* + * Setup index and instruct attr to read index only + */ + if (!args->worktree_attributes) { + memset(&opts, 0, sizeof(opts)); + opts.index_only = 1; + opts.head_idx = -1; + opts.src_index = &the_index; + opts.dst_index = &the_index; + opts.fn = oneway_merge; + init_tree_desc(&t, args->tree->buffer, args->tree->size); + if (unpack_trees(1, &t, &opts)) + return -1; + git_attr_set_direction(GIT_ATTR_INDEX, &the_index); + } + + err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec, + write_archive_entry, &context); + if (err == READ_TREE_RECURSIVE) + err = 0; + return err; +} + +static const struct archiver *lookup_archiver(const char *name) +{ + int i; + + if (!name) + return NULL; + + for (i = 0; i < ARRAY_SIZE(archivers); i++) { + if (!strcmp(name, archivers[i].name)) + return &archivers[i]; + } + return NULL; +} + +static int reject_entry(const unsigned char *sha1, const char *base, + int baselen, const char *filename, unsigned mode, + int stage, void *context) +{ + return -1; +} + +static int path_exists(struct tree *tree, const char *path) +{ + const char *pathspec[] = { path, NULL }; + + if (read_tree_recursive(tree, "", 0, 0, pathspec, reject_entry, NULL)) + return 1; + return 0; +} + +static void parse_pathspec_arg(const char **pathspec, + struct archiver_args *ar_args) +{ + ar_args->pathspec = pathspec = get_pathspec("", pathspec); + if (pathspec) { + while (*pathspec) { + if (!path_exists(ar_args->tree, *pathspec)) + die("path not found: %s", *pathspec); + pathspec++; + } + } +} + +static void parse_treeish_arg(const char **argv, + struct archiver_args *ar_args, const char *prefix) +{ + const char *name = argv[0]; + const unsigned char *commit_sha1; + time_t archive_time; + struct tree *tree; + const struct commit *commit; + unsigned char sha1[20]; + + if (get_sha1(name, sha1)) + die("Not a valid object name"); + + commit = lookup_commit_reference_gently(sha1, 1); + if (commit) { + commit_sha1 = commit->object.sha1; + archive_time = commit->date; + } else { + commit_sha1 = NULL; + archive_time = time(NULL); + } + + tree = parse_tree_indirect(sha1); + if (tree == NULL) + die("not a tree object"); + + if (prefix) { + unsigned char tree_sha1[20]; + unsigned int mode; + int err; + + err = get_tree_entry(tree->object.sha1, prefix, + tree_sha1, &mode); + if (err || !S_ISDIR(mode)) + die("current working directory is untracked"); + + tree = parse_tree_indirect(tree_sha1); + } + ar_args->tree = tree; + ar_args->commit_sha1 = commit_sha1; + ar_args->commit = commit; + ar_args->time = archive_time; +} + +#define OPT__COMPR(s, v, h, p) \ + { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \ + PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) } +#define OPT__COMPR_HIDDEN(s, v, p) \ + { OPTION_SET_INT, (s), NULL, (v), NULL, "", \ + PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) } + +static int parse_archive_args(int argc, const char **argv, + const struct archiver **ar, struct archiver_args *args) +{ + const char *format = "tar"; + const char *base = NULL; + const char *remote = NULL; + const char *exec = NULL; + const char *output = NULL; + int compression_level = -1; + int verbose = 0; + int i; + int list = 0; + int worktree_attributes = 0; + struct option opts[] = { + OPT_GROUP(""), + OPT_STRING(0, "format", &format, "fmt", "archive format"), + OPT_STRING(0, "prefix", &base, "prefix", + "prepend prefix to each pathname in the archive"), + OPT_STRING('o', "output", &output, "file", + "write the archive to this file"), + OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes, + "read .gitattributes in working directory"), + OPT__VERBOSE(&verbose), + OPT__COMPR('0', &compression_level, "store only", 0), + OPT__COMPR('1', &compression_level, "compress faster", 1), + OPT__COMPR_HIDDEN('2', &compression_level, 2), + OPT__COMPR_HIDDEN('3', &compression_level, 3), + OPT__COMPR_HIDDEN('4', &compression_level, 4), + OPT__COMPR_HIDDEN('5', &compression_level, 5), + OPT__COMPR_HIDDEN('6', &compression_level, 6), + OPT__COMPR_HIDDEN('7', &compression_level, 7), + OPT__COMPR_HIDDEN('8', &compression_level, 8), + OPT__COMPR('9', &compression_level, "compress better", 9), + OPT_GROUP(""), + OPT_BOOLEAN('l', "list", &list, + "list supported archive formats"), + OPT_GROUP(""), + 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_END() + }; + + argc = parse_options(argc, argv, NULL, opts, archive_usage, 0); + + if (remote) + die("Unexpected option --remote"); + if (exec) + die("Option --exec can only be used together with --remote"); + if (output) + die("Unexpected option --output"); + + if (!base) + base = ""; + + if (list) { + for (i = 0; i < ARRAY_SIZE(archivers); i++) + printf("%s\n", archivers[i].name); + exit(0); + } + + /* We need at least one parameter -- tree-ish */ + if (argc < 1) + usage_with_options(archive_usage, opts); + *ar = lookup_archiver(format); + if (!*ar) + die("Unknown archive format '%s'", format); + + args->compression_level = Z_DEFAULT_COMPRESSION; + if (compression_level != -1) { + if ((*ar)->flags & USES_ZLIB_COMPRESSION) + args->compression_level = compression_level; + else { + die("Argument not supported for format '%s': -%d", + format, compression_level); + } + } + args->verbose = verbose; + args->base = base; + args->baselen = strlen(base); + args->worktree_attributes = worktree_attributes; + + return argc; +} + +int write_archive(int argc, const char **argv, const char *prefix, + int setup_prefix) +{ + const struct archiver *ar = NULL; + struct archiver_args args; + + argc = parse_archive_args(argc, argv, &ar, &args); + if (setup_prefix && prefix == NULL) + prefix = setup_git_directory(); + + parse_treeish_arg(argv, &args, prefix); + parse_pathspec_arg(argv + 1, &args); + + git_config(git_default_config, NULL); + + return ar->write_archive(&args); +} |