Function add_packed_git

packfile.c:794–860

}

struct packed_git *add_packed_git(struct repository *r, const char *path,
				  size_t path_len, int local)
{
	struct stat st;
	size_t alloc;
	struct packed_git *p;
	struct object_id oid;

	/*
	 * Make sure a corresponding .pack file exists and that
	 * the index looks sane.
	 */
	if (!strip_suffix_mem(path, &path_len, ".idx"))
		return NULL;

	/*
	 * ".promisor" is long enough to hold any suffix we're adding (and
	 * the use xsnprintf double-checks that)
	 */
	alloc = st_add3(path_len, strlen(".promisor"), 1);
	p = alloc_packed_git(r, alloc);
	memcpy(p->pack_name, path, path_len);

	/*
	 * Note that we have to check auxiliary data structures before we check
	 * for the ".pack" file to exist to avoid races with a packfile that is
	 * in the process of being deleted. The ".pack" file is unlinked before
	 * its auxiliary data structures, so we know that we either get a
	 * consistent snapshot of all data structures or that we'll fail to
	 * stat(3p) the packfile itself and thus return `NULL`.
	 *
	 * As such, we cannot bail out before the access(3p) calls in case the
	 * packfile doesn't exist without doing two stat(3p) calls for it.
	 */
	xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
	if (!access(p->pack_name, F_OK))
		p->pack_keep = 1;

	xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor");
	if (!access(p->pack_name, F_OK))
		p->pack_promisor = 1;

	xsnprintf(p->pack_name + path_len, alloc - path_len, ".mtimes");
	if (!access(p->pack_name, F_OK))
		p->is_cruft = 1;

	xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
	if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
		free(p);
		return NULL;
	}

	/* ok, it looks sane as far as we can check without
	 * actually mapping the pack file.
	 */
	p->pack_size = st.st_size;
	p->pack_local = local;
	p->mtime = st.st_mtime;