rename_ref: use lstat(2) when testing for symlink

The current check for symlinked reflogs was based on stat(2), which is
utterly embarrassing.

Fix it, and add a matching testcase.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/refs.c b/refs.c
index cdedb45..c23561e 100644
--- a/refs.c
+++ b/refs.c
@@ -792,7 +792,7 @@ int rename_ref(const char *oldref, const char *newref)
 	struct ref_lock *lock;
 	char msg[PATH_MAX*2 + 100];
 	struct stat loginfo;
-	int log = !stat(git_path("logs/%s", oldref), &loginfo);
+	int log = !lstat(git_path("logs/%s", oldref), &loginfo);
 
 	if (S_ISLNK(loginfo.st_mode))
 		return error("reflog for %s is a symlink", oldref);