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lock_ref_sha1_basic(): if locking fails with ENOENT, retry

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If hold_lock_file_for_update() fails with errno==ENOENT, it might be
because somebody else (for example, a pack-refs process) has just
deleted one of the lockfile's ancestor directories.  So if this
condition is detected, try again (up to 3 times).

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2014-01-18 23:48:55 +01:00 committed by Junio C Hamano
parent c4c61c763e
commit e5c223e98b
1 changed files with 12 additions and 1 deletions
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13
refs.c
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@ -2081,7 +2081,7 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
lock->lk = xcalloc(1, sizeof(struct lock_file));
lflags = LOCK_DIE_ON_ERROR;
lflags = 0;
if (flags & REF_NODEREF) {
refname = orig_refname;
lflags |= LOCK_NODEREF;
@ -2109,6 +2109,17 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
}
lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
if (lock->lock_fd < 0) {
if (errno == ENOENT && --attempts_remaining > 0)
/*
* Maybe somebody just deleted one of the
* directories leading to ref_file. Try
* again:
*/
goto retry;
else
unable_to_lock_index_die(ref_file, errno);
}
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
error_return: