Initial commit for TizenHEADsubmit/2.0alpha/20130201.014617accepted/2.0alpha/20130201.0121062.0alpha

1 files changed, 575 insertions, 0 deletions

diff --git a/setup.c b/setup.c
new file mode 100644
index 0000000..2769160
--- /dev/null
+++ b/setup.c
@@ -0,0 +1,575 @@
+#include "cache.h"
+#include "dir.h"
+
+static int inside_git_dir = -1;
+static int inside_work_tree = -1;
+
+const char *prefix_path(const char *prefix, int len, const char *path)
+{
+	const char *orig = path;
+	char *sanitized = xmalloc(len + strlen(path) + 1);
+	if (is_absolute_path(orig))
+		strcpy(sanitized, path);
+	else {
+		if (len)
+			memcpy(sanitized, prefix, len);
+		strcpy(sanitized + len, path);
+	}
+	if (normalize_path_copy(sanitized, sanitized))
+		goto error_out;
+	if (is_absolute_path(orig)) {
+		size_t root_len, len, total;
+		const char *work_tree = get_git_work_tree();
+		if (!work_tree)
+			goto error_out;
+		len = strlen(work_tree);
+		root_len = offset_1st_component(work_tree);
+		total = strlen(sanitized) + 1;
+		if (strncmp(sanitized, work_tree, len) ||
+		    (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
+		error_out:
+			die("'%s' is outside repository", orig);
+		}
+		if (sanitized[len] == '/')
+			len++;
+		memmove(sanitized, sanitized + len, total - len);
+	}
+	return sanitized;
+}
+
+/*
+ * Unlike prefix_path, this should be used if the named file does
+ * not have to interact with index entry; i.e. name of a random file
+ * on the filesystem.
+ */
+const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
+{
+	static char path[PATH_MAX];
+#ifndef WIN32
+	if (!pfx || !*pfx || is_absolute_path(arg))
+		return arg;
+	memcpy(path, pfx, pfx_len);
+	strcpy(path + pfx_len, arg);
+#else
+	char *p;
+	/* don't add prefix to absolute paths, but still replace '\' by '/' */
+	if (is_absolute_path(arg))
+		pfx_len = 0;
+	else
+		memcpy(path, pfx, pfx_len);
+	strcpy(path + pfx_len, arg);
+	for (p = path + pfx_len; *p; p++)
+		if (*p == '\\')
+			*p = '/';
+#endif
+	return path;
+}
+
+int check_filename(const char *prefix, const char *arg)
+{
+	const char *name;
+	struct stat st;
+
+	name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
+	if (!lstat(name, &st))
+		return 1; /* file exists */
+	if (errno == ENOENT || errno == ENOTDIR)
+		return 0; /* file does not exist */
+	die_errno("failed to stat '%s'", arg);
+}
+
+static void NORETURN die_verify_filename(const char *prefix, const char *arg)
+{
+	unsigned char sha1[20];
+	unsigned mode;
+	/* try a detailed diagnostic ... */
+	get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
+	/* ... or fall back the most general message. */
+	die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
+	    "Use '--' to separate paths from revisions", arg);
+
+}
+
+/*
+ * Verify a filename that we got as an argument for a pathspec
+ * entry. Note that a filename that begins with "-" never verifies
+ * as true, because even if such a filename were to exist, we want
+ * it to be preceded by the "--" marker (or we want the user to
+ * use a format like "./-filename")
+ */
+void verify_filename(const char *prefix, const char *arg)
+{
+	if (*arg == '-')
+		die("bad flag '%s' used after filename", arg);
+	if (check_filename(prefix, arg))
+		return;
+	die_verify_filename(prefix, arg);
+}
+
+/*
+ * Opposite of the above: the command line did not have -- marker
+ * and we parsed the arg as a refname.  It should not be interpretable
+ * as a filename.
+ */
+void verify_non_filename(const char *prefix, const char *arg)
+{
+	if (!is_inside_work_tree() || is_inside_git_dir())
+		return;
+	if (*arg == '-')
+		return; /* flag */
+	if (!check_filename(prefix, arg))
+		return;
+	die("ambiguous argument '%s': both revision and filename\n"
+	    "Use '--' to separate filenames from revisions", arg);
+}
+
+const char **get_pathspec(const char *prefix, const char **pathspec)
+{
+	const char *entry = *pathspec;
+	const char **src, **dst;
+	int prefixlen;
+
+	if (!prefix && !entry)
+		return NULL;
+
+	if (!entry) {
+		static const char *spec[2];
+		spec[0] = prefix;
+		spec[1] = NULL;
+		return spec;
+	}
+
+	/* Otherwise we have to re-write the entries.. */
+	src = pathspec;
+	dst = pathspec;
+	prefixlen = prefix ? strlen(prefix) : 0;
+	while (*src) {
+		const char *p = prefix_path(prefix, prefixlen, *src);
+		*(dst++) = p;
+		src++;
+	}
+	*dst = NULL;
+	if (!*pathspec)
+		return NULL;
+	return pathspec;
+}
+
+/*
+ * Test if it looks like we're at a git directory.
+ * We want to see:
+ *
+ *  - either an objects/ directory _or_ the proper
+ *    GIT_OBJECT_DIRECTORY environment variable
+ *  - a refs/ directory
+ *  - either a HEAD symlink or a HEAD file that is formatted as
+ *    a proper "ref:", or a regular file HEAD that has a properly
+ *    formatted sha1 object name.
+ */
+static int is_git_directory(const char *suspect)
+{
+	char path[PATH_MAX];
+	size_t len = strlen(suspect);
+
+	if (PATH_MAX <= len + strlen("/objects"))
+		die("Too long path: %.*s", 60, suspect);
+	strcpy(path, suspect);
+	if (getenv(DB_ENVIRONMENT)) {
+		if (access(getenv(DB_ENVIRONMENT), X_OK))
+			return 0;
+	}
+	else {
+		strcpy(path + len, "/objects");
+		if (access(path, X_OK))
+			return 0;
+	}
+
+	strcpy(path + len, "/refs");
+	if (access(path, X_OK))
+		return 0;
+
+	strcpy(path + len, "/HEAD");
+	if (validate_headref(path))
+		return 0;
+
+	return 1;
+}
+
+int is_inside_git_dir(void)
+{
+	if (inside_git_dir < 0)
+		inside_git_dir = is_inside_dir(get_git_dir());
+	return inside_git_dir;
+}
+
+int is_inside_work_tree(void)
+{
+	if (inside_work_tree < 0)
+		inside_work_tree = is_inside_dir(get_git_work_tree());
+	return inside_work_tree;
+}
+
+/*
+ * set_work_tree() is only ever called if you set GIT_DIR explicitly.
+ * The old behaviour (which we retain here) is to set the work tree root
+ * to the cwd, unless overridden by the config, the command line, or
+ * GIT_WORK_TREE.
+ */
+static const char *set_work_tree(const char *dir)
+{
+	char buffer[PATH_MAX + 1];
+
+	if (!getcwd(buffer, sizeof(buffer)))
+		die ("Could not get the current working directory");
+	git_work_tree_cfg = xstrdup(buffer);
+	inside_work_tree = 1;
+
+	return NULL;
+}
+
+void setup_work_tree(void)
+{
+	const char *work_tree, *git_dir;
+	static int initialized = 0;
+
+	if (initialized)
+		return;
+	work_tree = get_git_work_tree();
+	git_dir = get_git_dir();
+	if (!is_absolute_path(git_dir))
+		git_dir = make_absolute_path(git_dir);
+	if (!work_tree || chdir(work_tree))
+		die("This operation must be run in a work tree");
+	set_git_dir(make_relative_path(git_dir, work_tree));
+	initialized = 1;
+}
+
+static int check_repository_format_gently(int *nongit_ok)
+{
+	git_config(check_repository_format_version, NULL);
+	if (GIT_REPO_VERSION < repository_format_version) {
+		if (!nongit_ok)
+			die ("Expected git repo version <= %d, found %d",
+			     GIT_REPO_VERSION, repository_format_version);
+		warning("Expected git repo version <= %d, found %d",
+			GIT_REPO_VERSION, repository_format_version);
+		warning("Please upgrade Git");
+		*nongit_ok = -1;
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * Try to read the location of the git directory from the .git file,
+ * return path to git directory if found.
+ */
+const char *read_gitfile_gently(const char *path)
+{
+	char *buf;
+	char *dir;
+	const char *slash;
+	struct stat st;
+	int fd;
+	size_t len;
+
+	if (stat(path, &st))
+		return NULL;
+	if (!S_ISREG(st.st_mode))
+		return NULL;
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		die_errno("Error opening '%s'", path);
+	buf = xmalloc(st.st_size + 1);
+	len = read_in_full(fd, buf, st.st_size);
+	close(fd);
+	if (len != st.st_size)
+		die("Error reading %s", path);
+	buf[len] = '\0';
+	if (prefixcmp(buf, "gitdir: "))
+		die("Invalid gitfile format: %s", path);
+	while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
+		len--;
+	if (len < 9)
+		die("No path in gitfile: %s", path);
+	buf[len] = '\0';
+	dir = buf + 8;
+
+	if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
+		size_t pathlen = slash+1 - path;
+		size_t dirlen = pathlen + len - 8;
+		dir = xmalloc(dirlen + 1);
+		strncpy(dir, path, pathlen);
+		strncpy(dir + pathlen, buf + 8, len - 8);
+		dir[dirlen] = '\0';
+		free(buf);
+		buf = dir;
+	}
+
+	if (!is_git_directory(dir))
+		die("Not a git repository: %s", dir);
+	path = make_absolute_path(dir);
+
+	free(buf);
+	return path;
+}
+
+/*
+ * We cannot decide in this function whether we are in the work tree or
+ * not, since the config can only be read _after_ this function was called.
+ */
+const char *setup_git_directory_gently(int *nongit_ok)
+{
+	const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
+	const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
+	static char cwd[PATH_MAX+1];
+	const char *gitdirenv;
+	const char *gitfile_dir;
+	int len, offset, ceil_offset, root_len;
+	dev_t current_device = 0;
+	int one_filesystem = 1;
+	struct stat buf;
+
+	/*
+	 * Let's assume that we are in a git repository.
+	 * If it turns out later that we are somewhere else, the value will be
+	 * updated accordingly.
+	 */
+	if (nongit_ok)
+		*nongit_ok = 0;
+
+	/*
+	 * If GIT_DIR is set explicitly, we're not going
+	 * to do any discovery, but we still do repository
+	 * validation.
+	 */
+	gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
+	if (gitdirenv) {
+		if (PATH_MAX - 40 < strlen(gitdirenv))
+			die("'$%s' too big", GIT_DIR_ENVIRONMENT);
+		if (is_git_directory(gitdirenv)) {
+			static char buffer[1024 + 1];
+			const char *retval;
+
+			if (!work_tree_env) {
+				retval = set_work_tree(gitdirenv);
+				/* config may override worktree */
+				if (check_repository_format_gently(nongit_ok))
+					return NULL;
+				return retval;
+			}
+			if (check_repository_format_gently(nongit_ok))
+				return NULL;
+			retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
+					get_git_work_tree());
+			if (!retval || !*retval)
+				return NULL;
+			set_git_dir(make_absolute_path(gitdirenv));
+			if (chdir(work_tree_env) < 0)
+				die_errno ("Could not chdir to '%s'", work_tree_env);
+			strcat(buffer, "/");
+			return retval;
+		}
+		if (nongit_ok) {
+			*nongit_ok = 1;
+			return NULL;
+		}
+		die("Not a git repository: '%s'", gitdirenv);
+	}
+
+	if (!getcwd(cwd, sizeof(cwd)-1))
+		die_errno("Unable to read current working directory");
+
+	ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
+	if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
+		ceil_offset = 1;
+
+	/*
+	 * Test in the following order (relative to the cwd):
+	 * - .git (file containing "gitdir: <path>")
+	 * - .git/
+	 * - ./ (bare)
+	 * - ../.git
+	 * - ../.git/
+	 * - ../ (bare)
+	 * - ../../.git/
+	 *   etc.
+	 */
+	offset = len = strlen(cwd);
+	one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
+	if (one_filesystem) {
+		if (stat(".", &buf))
+			die_errno("failed to stat '.'");
+		current_device = buf.st_dev;
+	}
+	for (;;) {
+		gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
+		if (gitfile_dir) {
+			if (set_git_dir(gitfile_dir))
+				die("Repository setup failed");
+			break;
+		}
+		if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
+			break;
+		if (is_git_directory(".")) {
+			inside_git_dir = 1;
+			if (!work_tree_env)
+				inside_work_tree = 0;
+			if (offset != len) {
+				root_len = offset_1st_component(cwd);
+				cwd[offset > root_len ? offset : root_len] = '\0';
+				set_git_dir(cwd);
+			} else
+				set_git_dir(".");
+			check_repository_format_gently(nongit_ok);
+			return NULL;
+		}
+		while (--offset > ceil_offset && cwd[offset] != '/');
+		if (offset <= ceil_offset) {
+			if (nongit_ok) {
+				if (chdir(cwd))
+					die_errno("Cannot come back to cwd");
+				*nongit_ok = 1;
+				return NULL;
+			}
+			die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
+		}
+		if (one_filesystem) {
+			if (stat("..", &buf)) {
+				cwd[offset] = '\0';
+				die_errno("failed to stat '%s/..'", cwd);
+			}
+			if (buf.st_dev != current_device) {
+				if (nongit_ok) {
+					if (chdir(cwd))
+						die_errno("Cannot come back to cwd");
+					*nongit_ok = 1;
+					return NULL;
+				}
+				cwd[offset] = '\0';
+				die("Not a git repository (or any parent up to mount parent %s)\n"
+				"Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
+			}
+		}
+		if (chdir("..")) {
+			cwd[offset] = '\0';
+			die_errno("Cannot change to '%s/..'", cwd);
+		}
+	}
+
+	inside_git_dir = 0;
+	if (!work_tree_env)
+		inside_work_tree = 1;
+	root_len = offset_1st_component(cwd);
+	git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
+	if (check_repository_format_gently(nongit_ok))
+		return NULL;
+	if (offset == len)
+		return NULL;
+
+	/* Make "offset" point to past the '/', and add a '/' at the end */
+	offset++;
+	cwd[len++] = '/';
+	cwd[len] = 0;
+	return cwd + offset;
+}
+
+int git_config_perm(const char *var, const char *value)
+{
+	int i;
+	char *endptr;
+
+	if (value == NULL)
+		return PERM_GROUP;
+
+	if (!strcmp(value, "umask"))
+		return PERM_UMASK;
+	if (!strcmp(value, "group"))
+		return PERM_GROUP;
+	if (!strcmp(value, "all") ||
+	    !strcmp(value, "world") ||
+	    !strcmp(value, "everybody"))
+		return PERM_EVERYBODY;
+
+	/* Parse octal numbers */
+	i = strtol(value, &endptr, 8);
+
+	/* If not an octal number, maybe true/false? */
+	if (*endptr != 0)
+		return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
+
+	/*
+	 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
+	 * a chmod value to restrict to.
+	 */
+	switch (i) {
+	case PERM_UMASK:               /* 0 */
+		return PERM_UMASK;
+	case OLD_PERM_GROUP:           /* 1 */
+		return PERM_GROUP;
+	case OLD_PERM_EVERYBODY:       /* 2 */
+		return PERM_EVERYBODY;
+	}
+
+	/* A filemode value was given: 0xxx */
+
+	if ((i & 0600) != 0600)
+		die("Problem with core.sharedRepository filemode value "
+		    "(0%.3o).\nThe owner of files must always have "
+		    "read and write permissions.", i);
+
+	/*
+	 * Mask filemode value. Others can not get write permission.
+	 * x flags for directories are handled separately.
+	 */
+	return -(i & 0666);
+}
+
+int check_repository_format_version(const char *var, const char *value, void *cb)
+{
+	if (strcmp(var, "core.repositoryformatversion") == 0)
+		repository_format_version = git_config_int(var, value);
+	else if (strcmp(var, "core.sharedrepository") == 0)
+		shared_repository = git_config_perm(var, value);
+	else if (strcmp(var, "core.bare") == 0) {
+		is_bare_repository_cfg = git_config_bool(var, value);
+		if (is_bare_repository_cfg == 1)
+			inside_work_tree = -1;
+	} else if (strcmp(var, "core.worktree") == 0) {
+		if (!value)
+			return config_error_nonbool(var);
+		free(git_work_tree_cfg);
+		git_work_tree_cfg = xstrdup(value);
+		inside_work_tree = -1;
+	}
+	return 0;
+}
+
+int check_repository_format(void)
+{
+	return check_repository_format_gently(NULL);
+}
+
+/*
+ * Returns the "prefix", a path to the current working directory
+ * relative to the work tree root, or NULL, if the current working
+ * directory is not a strict subdirectory of the work tree root. The
+ * prefix always ends with a '/' character.
+ */
+const char *setup_git_directory(void)
+{
+	const char *retval = setup_git_directory_gently(NULL);
+
+	/* If the work tree is not the default one, recompute prefix */
+	if (inside_work_tree < 0) {
+		static char buffer[PATH_MAX + 1];
+		char *rel;
+		if (retval && chdir(retval))
+			die_errno ("Could not jump back into original cwd");
+		rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
+		if (rel && *rel && chdir(get_git_work_tree()))
+			die_errno ("Could not jump to working directory");
+		return rel && *rel ? strcat(rel, "/") : NULL;
+	}
+
+	return retval;
+}