[PATCH] Use OBJECT_INFO_QUICK to speedup git fetch-pack

[Takuto Ikuta <tikuta@google.com>]

Do not call prepare_packed_git for every refs.
In fetch-pack, git list ups entries in .git/objects/pack
directory for each refs.
Such behavior makes git fetch-pack slow for the repository having the
large number of refs, especially for windows.

For chromium repository, having more than 300000 remote refs, git fetch
takes more than 3 minutes if fetch-pack runs on my windows workstation.
This patch improves the time to around 17 seconds in the same machine.

Signed-off-by: Takuto Ikuta <tikuta@google.com>
---
 fetch-pack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fetch-pack.c b/fetch-pack.c
index 008b25d3db087..0184584e80599 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -716,7 +716,7 @@ static int everything_local(struct fetch_pack_args *args,
 	for (ref = *refs; ref; ref = ref->next) {
 		struct object *o;
 
-		if (!has_object_file(&ref->old_oid))
+		if (!has_object_file_with_flags(&ref->old_oid, OBJECT_INFO_QUICK))
 			continue;
 
 		o = parse_object(&ref->old_oid);

--
https://github.com/git/git/pull/437