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refs.c: verify_lock should set errno to something meaningful

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Making errno when returning from verify_lock() meaningful, which
should almost but not completely fix

 * a bug in "git fetch"'s s_update_ref, which trusts the result of an
   errno == ENOTDIR check to detect D/F conflicts

ENOTDIR makes sense as a sign that a file was in the way of a
directory we wanted to create.  Should "git fetch" also look for
ENOTEMPTY or EEXIST to catch cases where a directory was in the way
of a file to be created?

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Michael Haggerty <mhagger@alum.mit.edu>
This commit is contained in:
Ronnie Sahlberg 2014-06-20 07:42:51 -07:00 committed by Junio C Hamano
parent bd3b02daec
commit 835e3c992f
2 changed files with 9 additions and 1 deletions
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4
refs.c
View file

@ -1932,18 +1932,22 @@ int refname_match(const char *abbrev_name, const char *full_name)
return 0;
}
/* 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)
{
if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
int save_errno = errno;
error("Can't verify ref %s", lock->ref_name);
unlock_ref(lock);
errno = save_errno;
return NULL;
}
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 lock;

6
refs.h
View file

@ -137,11 +137,15 @@ extern int ref_exists(const char *);
*/
extern int peel_ref(const char *refname, unsigned char *sha1);
/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
/*
* Locks a "refs/" ref returning the lock on success and NULL on failure.
* On failure errno is set to something meaningful.
*/
extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1);
/** Locks any ref (for 'HEAD' type refs). */
#define REF_NODEREF 0x01
/* errno is set to something meaningful on failure */
extern struct ref_lock *lock_any_ref_for_update(const char *refname,
const unsigned char *old_sha1,
int flags, int *type_p);