C++ read_gitfile函数代码示例

static int add_one_reference(struct string_list_item *item, void *cb_data)
{
	char *ref_git;
	const char *repo;
	struct strbuf alternate = STRBUF_INIT;

	/* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
	ref_git = xstrdup(real_path(item->string));

	repo = read_gitfile(ref_git);
	if (!repo)
		repo = read_gitfile(mkpath("%s/.git", ref_git));
	if (repo) {
		free(ref_git);
		ref_git = xstrdup(repo);
	}

	if (!repo && is_directory(mkpath("%s/.git/objects", 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)))
		die(_("reference repository '%s' is not a local repository."),
		    item->string);

	strbuf_addf(&alternate, "%s/objects", ref_git);
	add_to_alternates_file(alternate.buf);
	strbuf_release(&alternate);
	free(ref_git);
	return 0;
}

void repo_set_gitdir(struct repository *repo,
		     const char *root,
		     const struct set_gitdir_args *o)
{
	const char *gitfile = read_gitfile(root);
	/*
	 * repo->gitdir is saved because the caller could pass "root"
	 * that also points to repo->gitdir. We want to keep it alive
	 * until after xstrdup(root). Then we can free it.
	 */
	char *old_gitdir = repo->gitdir;

	repo->gitdir = xstrdup(gitfile ? gitfile : root);
	free(old_gitdir);

	repo_set_commondir(repo, o->commondir);
	expand_base_dir(&repo->objects->objectdir, o->object_dir,
			repo->commondir, "objects");
	free(repo->objects->alternate_db);
	repo->objects->alternate_db = xstrdup_or_null(o->alternate_db);
	expand_base_dir(&repo->graft_file, o->graft_file,
			repo->commondir, "info/grafts");
	expand_base_dir(&repo->index_file, o->index_file,
			repo->gitdir, "index");
}

static void do_submodule_path(struct strbuf *buf, const char *path,
			      const char *fmt, va_list args)
{
	const char *git_dir;
	struct strbuf git_submodule_common_dir = STRBUF_INIT;
	struct strbuf git_submodule_dir = STRBUF_INIT;

	strbuf_addstr(buf, path);
	strbuf_complete(buf, '/');
	strbuf_addstr(buf, ".git");

	git_dir = read_gitfile(buf->buf);
	if (git_dir) {
		strbuf_reset(buf);
		strbuf_addstr(buf, git_dir);
	}
	strbuf_addch(buf, '/');
	strbuf_addstr(&git_submodule_dir, buf->buf);

	strbuf_vaddf(buf, fmt, args);

	if (get_common_dir_noenv(&git_submodule_common_dir, git_submodule_dir.buf))
		update_common_dir(buf, git_submodule_dir.len, git_submodule_common_dir.buf);

	strbuf_cleanup_path(buf);

	strbuf_release(&git_submodule_dir);
	strbuf_release(&git_submodule_common_dir);
}

int update_submodule(const char *path, const unsigned char sha1[20], int force)
{
	struct strbuf buf = STRBUF_INIT;
	struct child_process cp;
	const char *hex_sha1 = sha1_to_hex(sha1);
	const char *argv[] = {
		"checkout",
		force ? "-fq" : "-q",
		hex_sha1,
		NULL,
	};
	const char *git_dir;

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir)
		git_dir = buf.buf;
	if (!is_directory(git_dir)) {
		strbuf_release(&buf);
		/* The submodule is not populated, so we can't check it out */
		return 0;
	}
	strbuf_release(&buf);

	memset(&cp, 0, sizeof(cp));
	cp.argv = argv;
	cp.env = local_repo_env;
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.dir = path;   /* GIT_WORK_TREE doesn't work for git checkout */
	if (run_command(&cp))
		return error("Could not checkout submodule %s", path);

	return 0;
}

int submodule_uses_gitfile(const char *path)
{
	struct child_process cp = CHILD_PROCESS_INIT;
	const char *argv[] = {
		"submodule",
		"foreach",
		"--quiet",
		"--recursive",
		"test -f .git",
		NULL,
	};
	struct strbuf buf = STRBUF_INIT;
	const char *git_dir;

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir) {
		strbuf_release(&buf);
		return 0;
	}
	strbuf_release(&buf);

	/* Now test that all nested submodules use a gitfile too */
	cp.argv = argv;
	cp.env = local_repo_env;
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.no_stderr = 1;
	cp.no_stdout = 1;
	cp.dir = path;
	if (run_command(&cp))
		return 0;

	return 1;
}

void repo_set_gitdir(struct repository *repo, const char *path)
{
	const char *gitfile = read_gitfile(path);
	char *old_gitdir = repo->gitdir;

	repo->gitdir = xstrdup(gitfile ? gitfile : path);
	repo_setup_env(repo);

	free(old_gitdir);
}

static int add_one_reference(struct string_list_item *item, void *cb_data)
{
	char *ref_git;
	const char *repo;
	struct strbuf alternate = STRBUF_INIT;

	/* Beware: read_gitfile(), real_path() and mkpath() return static buffer */
	ref_git = xstrdup(real_path(item->string));

	repo = read_gitfile(ref_git);
	if (!repo)
		repo = read_gitfile(mkpath("%s/.git", ref_git));
	if (repo) {
		free(ref_git);
		ref_git = xstrdup(repo);
	}

	if (!repo && is_directory(mkpath("%s/.git/objects", 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))) {
		struct strbuf sb = STRBUF_INIT;
		if (get_common_dir(&sb, ref_git))
			die(_("reference repository '%s' as a linked checkout is not supported yet."),
			    item->string);
		die(_("reference repository '%s' is not a local repository."),
		    item->string);
	}

	if (!access(mkpath("%s/shallow", ref_git), F_OK))
		die(_("reference repository '%s' is shallow"), item->string);

	if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
		die(_("reference repository '%s' is grafted"), item->string);

	strbuf_addf(&alternate, "%s/objects", ref_git);
	add_to_alternates_file(alternate.buf);
	strbuf_release(&alternate);
	free(ref_git);
	return 0;
}

static void prepare_move_submodule(const char *src, int first,
				   const char **submodule_gitfile)
{
	struct strbuf submodule_dotgit = STRBUF_INIT;
	if (!S_ISGITLINK(active_cache[first]->ce_mode))
		die(_("Directory %s is in index and no submodule?"), src);
	if (!is_staging_gitmodules_ok())
		die(_("Please stage your changes to .gitmodules or stash them to proceed"));
	strbuf_addf(&submodule_dotgit, "%s/.git", src);
	*submodule_gitfile = read_gitfile(submodule_dotgit.buf);
	if (*submodule_gitfile)
		*submodule_gitfile = xstrdup(*submodule_gitfile);
	else
		*submodule_gitfile = SUBMODULE_WITH_GITDIR;
	strbuf_release(&submodule_dotgit);
}

static const char *get_repo_path_1(struct strbuf *path, int *is_bundle)
{
	static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
	static char *bundle_suffix[] = { ".bundle", "" };
	size_t baselen = path->len;
	struct stat st;
	int i;

	for (i = 0; i < ARRAY_SIZE(suffix); i++) {
		strbuf_setlen(path, baselen);
		strbuf_addstr(path, suffix[i]);
		if (stat(path->buf, &st))
			continue;
		if (S_ISDIR(st.st_mode) && is_git_directory(path->buf)) {
			*is_bundle = 0;
			return path->buf;
		} else if (S_ISREG(st.st_mode) && st.st_size > 8) {
			/* Is it a "gitfile"? */
			char signature[8];
			const char *dst;
			int len, fd = open(path->buf, O_RDONLY);
			if (fd < 0)
				continue;
			len = read_in_full(fd, signature, 8);
			close(fd);
			if (len != 8 || strncmp(signature, "gitdir: ", 8))
				continue;
			dst = read_gitfile(path->buf);
			if (dst) {
				*is_bundle = 0;
				return dst;
			}
		}
	}

	for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
		strbuf_setlen(path, baselen);
		strbuf_addstr(path, bundle_suffix[i]);
		if (!stat(path->buf, &st) && S_ISREG(st.st_mode)) {
			*is_bundle = 1;
			return path->buf;
		}
	}

	return NULL;
}

static char *get_repo_path(const char *repo, int *is_bundle)
{
	static char *suffix[] = { "/.git", "", ".git/.git", ".git" };
	static char *bundle_suffix[] = { ".bundle", "" };
	struct stat st;
	int i;

	for (i = 0; i < ARRAY_SIZE(suffix); i++) {
		const char *path;
		path = mkpath("%s%s", repo, suffix[i]);
		if (stat(path, &st))
			continue;
		if (S_ISDIR(st.st_mode) && is_git_directory(path)) {
			*is_bundle = 0;
			return xstrdup(absolute_path(path));
		} else if (S_ISREG(st.st_mode) && st.st_size > 8) {
			/* Is it a "gitfile"? */
			char signature[8];
			int len, fd = open(path, O_RDONLY);
			if (fd < 0)
				continue;
			len = read_in_full(fd, signature, 8);
			close(fd);
			if (len != 8 || strncmp(signature, "gitdir: ", 8))
				continue;
			path = read_gitfile(path);
			if (path) {
				*is_bundle = 0;
				return xstrdup(absolute_path(path));
			}
		}
	}

	for (i = 0; i < ARRAY_SIZE(bundle_suffix); i++) {
		const char *path;
		path = mkpath("%s%s", repo, bundle_suffix[i]);
		if (!stat(path, &st) && S_ISREG(st.st_mode)) {
			*is_bundle = 1;
			return xstrdup(absolute_path(path));
		}
	}

	return NULL;
}

static void separate_git_dir(const char *git_dir, const char *git_link)
{
	struct stat st;

	if (!stat(git_link, &st)) {
		const char *src;

		if (S_ISREG(st.st_mode))
			src = read_gitfile(git_link);
		else if (S_ISDIR(st.st_mode))
			src = git_link;
		else
			die(_("unable to handle file type %d"), (int)st.st_mode);

		if (rename(src, git_dir))
			die_errno(_("unable to move %s to %s"), src, git_dir);
	}

	write_file(git_link, "gitdir: %s", git_dir);
}

static int add_submodule_odb(const char *path)
{
	struct strbuf objects_directory = STRBUF_INIT;
	struct alternate_object_database *alt_odb;
	int ret = 0;
	const char *git_dir;

	strbuf_addf(&objects_directory, "%s/.git", path);
	git_dir = read_gitfile(objects_directory.buf);
	if (git_dir) {
		strbuf_reset(&objects_directory);
		strbuf_addstr(&objects_directory, git_dir);
	}
	strbuf_addstr(&objects_directory, "/objects/");
	if (!is_directory(objects_directory.buf)) {
		ret = -1;
		goto done;
	}
	/* avoid adding it twice */
	for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
		if (alt_odb->name - alt_odb->base == objects_directory.len &&
				!strncmp(alt_odb->base, objects_directory.buf,
					objects_directory.len))
			goto done;

	alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
	alt_odb->next = alt_odb_list;
	strcpy(alt_odb->base, objects_directory.buf);
	alt_odb->name = alt_odb->base + objects_directory.len;
	alt_odb->name[2] = '/';
	alt_odb->name[40] = '\0';
	alt_odb->name[41] = '\0';
	alt_odb_list = alt_odb;

	/* add possible alternates from the submodule */
	read_info_alternates(objects_directory.buf, 0);
	prepare_alt_odb();
done:
	strbuf_release(&objects_directory);
	return ret;
}

unsigned is_submodule_checkout_safe(const char *path, const unsigned char sha1[20])
{
	struct strbuf buf = STRBUF_INIT;
	struct child_process cp;
	const char *hex_sha1 = sha1_to_hex(sha1);
	const char *argv[] = {
		"read-tree",
		"-n",
		"-m",
		"HEAD",
		hex_sha1,
		NULL,
	};
	const char *git_dir;

	strbuf_addf(&buf, "%s/.git", path);
	git_dir = read_gitfile(buf.buf);
	if (!git_dir)
		git_dir = buf.buf;
	if (!is_directory(git_dir)) {
		strbuf_release(&buf);
		/* The submodule is not populated, it's safe to check it out */
		/*
		 * TODO: When git learns to re-populate submodules, a check must be
		 * added here to assert that no local files will be overwritten.
		 */
		return 1;
	}
	strbuf_release(&buf);

	memset(&cp, 0, sizeof(cp));
	cp.argv = argv;
	cp.env = local_repo_env;
	cp.git_cmd = 1;
	cp.no_stdin = 1;
	cp.dir = path;
	return run_command(&cp) == 0;
}

char *git_path_submodule(const char *path, const char *fmt, ...)
{
	char *pathname = get_pathname();
	struct strbuf buf = STRBUF_INIT;
	const char *git_dir;
	va_list args;
	unsigned len;

	len = strlen(path);
	if (len > PATH_MAX-100)
		return bad_path;

	strbuf_addstr(&buf, path);
	if (len && path[len-1] != '/')
		strbuf_addch(&buf, '/');
	strbuf_addstr(&buf, ".git");

	git_dir = read_gitfile(buf.buf);
	if (git_dir) {
		strbuf_reset(&buf);
		strbuf_addstr(&buf, git_dir);
	}
	strbuf_addch(&buf, '/');

	if (buf.len >= PATH_MAX)
		return bad_path;
	memcpy(pathname, buf.buf, buf.len + 1);

	strbuf_release(&buf);
	len = strlen(pathname);

	va_start(args, fmt);
	len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
	va_end(args);
	if (len >= PATH_MAX)
		return bad_path;
	return cleanup_path(pathname);
}

const char *git_path_submodule(const char *path, const char *fmt, ...)
{
	struct strbuf *buf = get_pathname();
	const char *git_dir;
	va_list args;

	strbuf_addstr(buf, path);
	if (buf->len && buf->buf[buf->len - 1] != '/')
		strbuf_addch(buf, '/');
	strbuf_addstr(buf, ".git");

	git_dir = read_gitfile(buf->buf);
	if (git_dir) {
		strbuf_reset(buf);
		strbuf_addstr(buf, git_dir);
	}
	strbuf_addch(buf, '/');

	va_start(args, fmt);
	strbuf_vaddf(buf, fmt, args);
	va_end(args);
	strbuf_cleanup_path(buf);
	return buf->buf;
}