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Teach git-describe to use peeled ref information when scanning tags 

By using the peeled ref information inside of the packed-refs file we
can avoid opening tag objects to obtain the commits they reference.
This speeds up git-describe when there are a large number of tags
in the repository as we have less objects to parse before we can
start commit matching.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shawn O. Pearce 2008-02-24 03:07:25 -05:00 committed by Junio C Hamano
parent 0ae91be0e1
commit feededd05b
1 changed files with 17 additions and 6 deletions
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23
builtin-describe.c
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@ -46,19 +46,30 @@ static void add_to_known_names(const char *path,
static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
struct commit *commit;
struct object *object;
int prio;
unsigned char peeled[20];
int is_tag, prio;
if (!peel_ref(path, peeled) && !is_null_sha1(peeled)) {
commit = lookup_commit_reference_gently(peeled, 1);
if (!commit)
return 0;
is_tag = !!hashcmp(sha1, commit->object.sha1);
} else {
commit = lookup_commit_reference_gently(sha1, 1);
object = parse_object(sha1);
if (!commit || !object)
return 0;
is_tag = object->type == OBJ_TAG;
}
if (!commit)
return 0;
object = parse_object(sha1);
/* If --all, then any refs are used.
* If --tags, then any tags are used.
* Otherwise only annotated tags are used.
*/
if (!prefixcmp(path, "refs/tags/")) {
if (object->type == OBJ_TAG) {
if (is_tag) {
prio = 2;
if (pattern && fnmatch(pattern, path + 10, 0))
prio = 0;