Attempt to delay prepare_alt_odb during get_sha1

Not every input value passed to get_sha1 is an abbreviated SHA-1.
Its actually quite common for refs to be passed and for those
refs to resolve to full SHA-1s, in which case we may not need to
initialize the alternate object database list in this process.

I'm relocating the call to prepare_alt_odb closer to the code
that actually needs it to maintain the fix first introduced by
Junio in 99a19b43 (to avoid ambiguous SHA-1 abbreviations from
being accepted).  This allows us to avoid the alt_odb list setup
if we won't actually need it.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/sha1_name.c b/sha1_name.c
index 55f25a2..8dfceb2 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -133,6 +133,7 @@ static int find_unique_short_object(int len, char *canonical,
        int has_unpacked, has_packed;
        unsigned char unpacked_sha1[20], packed_sha1[20];
 
+       prepare_alt_odb();
        has_unpacked = find_short_object_filename(len, canonical, unpacked_sha1);
        has_packed = find_short_packed_object(len, res, packed_sha1);
        if (!has_unpacked && !has_packed)
@@ -654,7 +655,6 @@ int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
        const char *cp;
 
        *mode = S_IFINVALID;
-       prepare_alt_odb();
        ret = get_sha1_1(name, namelen, sha1);
        if (!ret)
                return ret;