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remote: make guess_remote_head() use exact HEAD lookup if it is available

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Our usual method for determining the ref pointed to by HEAD
is to compare HEAD's sha1 to the sha1 of all refs, trying to
find a unique match.

However, some transports actually get to look at HEAD
directly; we should make use of that information when it is
available.  Currently, only http remotes support this
feature.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2009-02-27 14:10:06 -05:00
committed by Junio C Hamano
parent bc14fac825
commit fbb074c253
2 changed files with 19 additions and 0 deletions
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8
remote.c
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@ -1476,6 +1476,14 @@ struct ref *guess_remote_head(const struct ref *head,
if (!head)
return NULL;
/*
* Some transports support directly peeking at
* where HEAD points; if that is the case, then
* we don't have to guess.
*/
if (head->symref)
return copy_ref(find_ref_by_name(refs, head->symref));
/* If refs/heads/master could be right, it is. */
if (!all) {
r = find_ref_by_name(refs, "refs/heads/master");