From 22a3844ebada55c207e2b85fb68509a7c9e2b5f0 Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Sat, 30 Sep 2006 14:19:25 -0700 Subject: [PATCH] lock_ref_sha1(): check D/F conflict with packed ref when creating. This makes the ref locking codepath to notice if an existing ref overlaps with the ref we are creating. Signed-off-by: Junio C Hamano --- refs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/refs.c b/refs.c index 157de432ce..2bfa92a8a3 100644 --- a/refs.c +++ b/refs.c @@ -588,6 +588,30 @@ static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char orig_ref, strerror(errno)); goto error_return; } + if (is_null_sha1(lock->old_sha1)) { + /* The ref did not exist and we are creating it. + * Make sure there is no existing ref that is packed + * whose name begins with our refname, nor a ref whose + * name is a proper prefix of our refname. + */ + int namlen = strlen(ref); /* e.g. 'foo/bar' */ + struct ref_list *list = get_packed_refs(); + while (list) { + /* list->name could be 'foo' or 'foo/bar/baz' */ + int len = strlen(list->name); + int cmplen = (namlen < len) ? namlen : len; + const char *lead = (namlen < len) ? list->name : ref; + + if (!strncmp(ref, list->name, cmplen) && + lead[cmplen] == '/') { + error("'%s' exists; cannot create '%s'", + list->name, ref); + goto error_return; + } + list = list->next; + } + } + lock->lk = xcalloc(1, sizeof(struct lock_file)); lock->ref_name = xstrdup(ref); -- 2.43.2