Subject: [PATCH 07/19] refs.c: move the check for valid refname to lock_ref_sha1_basic

From: Jonathan Nieder <[email-masked]>
Date: Wed, 10 Sep 2014 20:07:22 -0700

From: Ronnie Sahlberg <[email-masked]>
Date: Thu, 1 May 2014 10:40:10 -0700

Move the check for check_refname_format from lock_any_ref_for_update
to lock_ref_sha1_basic. At some later stage we will get rid of
lock_any_ref_for_update completely. This has no visible impact to callers,
except for inability to lock badly named refs which is not possible today
anyway but for other reasons.

Keep lock_any_ref_for_update as a no-op wrapper --- it is the public facing
version of this interface and keeping it as a separate function will make
it easier to experiment with the internal lock_ref_sha1_basic signature.

Note that if lock_ref_sha1_basic now checks the refname format and fails to
lock the ref it will not be possible to delete such a ref since deletion
implies we first lock the ref. In fact, we currently fail even earlier than
that since these refs are not even recognized to exist.

Example:
$ cp .git/refs/heads/master .git/refs/heads/echo...\*\*
$ ./git branch -D .git/refs/heads/echo...\*\*
error: branch '.git/refs/heads/echo...**' not found.

This is not a new regression and this has been broken for a while.
Later patches in the series will start repairing the handling of badly
named refs, at which time we will need to modify lock_ref_sha1_basic once more
in order to allow locking these refs for certain use cases such as rename
and delete.

Signed-off-by: Ronnie Sahlberg <[email-masked]>
Signed-off-by: Jonathan Nieder <[email-masked]>
---
 refs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/refs.c b/refs.c
index 39571f5..3c2ce57 100644
--- a/refs.c
+++ b/refs.c
@@ -2091,6 +2091,11 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
 	int missing = 0;
 	int attempts_remaining = 3;
 
+	if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+		errno = EINVAL;
+		return NULL;
+	}
+
 	lock = xcalloc(1, sizeof(struct ref_lock));
 	lock->lock_fd = -1;
 
@@ -2182,8 +2187,6 @@ struct ref_lock *lock_any_ref_for_update(const char *refname,
 					 const unsigned char *old_sha1,
 					 int flags, int *type_p)
 {
-	if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
-		return NULL;
 	return lock_ref_sha1_basic(refname, old_sha1, flags, type_p);
 }
 
-- 
2.1.0.rc2.206.gedb03e5