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verify_lock(): return 0/-1 rather than struct ref_lock *

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Its return value wasn't conveying any extra information, but it made
the reader wonder whether the ref_lock that it returned might be
different than the one that was passed to it. So change the function
to the traditional "return 0 on success or a negative value on error".

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 2015-05-23 01:34:53 +02:00 committed by Junio C Hamano
parent fae46aa0ae
commit a5e2499e54
1 changed files with 14 additions and 7 deletions
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21
refs.c
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@ -2218,9 +2218,14 @@ static void unlock_ref(struct ref_lock *lock)
free(lock);
}
/* This function should make sure errno is meaningful on error */
static struct ref_lock *verify_lock(struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist)
/*
* Verify that the reference locked by lock has the value old_sha1.
* Fail if the reference doesn't exist and mustexist is set. Return 0
* on success or a negative value on error. This function should make
* sure errno is meaningful on error.
*/
static int verify_lock(struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist)
{
if (read_ref_full(lock->ref_name,
mustexist ? RESOLVE_REF_READING : 0,
@ -2229,16 +2234,16 @@ static struct ref_lock *verify_lock(struct ref_lock *lock,
error("Can't verify ref %s", lock->ref_name);
unlock_ref(lock);
errno = save_errno;
return NULL;
return -1;
}
if (hashcmp(lock->old_sha1, old_sha1)) {
error("Ref %s is at %s but expected %s", lock->ref_name,
sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
unlock_ref(lock);
errno = EBUSY;
return NULL;
return -1;
}
return lock;
return 0;
}
static int remove_empty_directories(const char *file)
@ -2466,7 +2471,9 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
goto error_return;
}
}
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
if (old_sha1 && verify_lock(lock, old_sha1, mustexist))
return NULL;
return lock;
error_return:
unlock_ref(lock);