path: root/builtin-symbolic-ref.c
diff options
authorJeff King <>2009-01-29 08:33:02 (GMT)
committerJunio C Hamano <>2009-01-29 09:00:48 (GMT)
commitafe5d3d516114f08d3c4289682a704f5a7889909 (patch)
tree6e0c89c0cb2396e09ff028ece3852fc8197b2fcb /builtin-symbolic-ref.c
parentb229d18a809c169314b7f0d048dc5a7632e8f916 (diff)
symbolic ref: refuse non-ref targets in HEAD
When calling "git symbolic-ref" it is easy to forget that the target must be a fully qualified ref. E.g., you might accidentally do: $ git symbolic-ref HEAD master Unfortunately, this is very difficult to recover from, because the bogus contents of HEAD make git believe we are no longer in a git repository (as is_git_dir explicitly checks for "^refs/heads/" in the HEAD target). So immediately trying to fix the situation doesn't work: $ git symbolic-ref HEAD refs/heads/master fatal: Not a git repository and one is left editing the .git/HEAD file manually. Furthermore, one might be tempted to use symbolic-ref to set up a detached HEAD: $ git symbolic-ref HEAD `git rev-parse HEAD` which sets up an even more bogus HEAD: $ cat .git/HEAD ref: 1a9ace4f2ad4176148e61b5a85cd63d5604aac6d This patch introduces a small safety valve to prevent the specific case of anything not starting with refs/heads/ to go into HEAD. The scope of the safety valve is intentionally very limited, to make sure that we are not preventing any behavior that would otherwise be valid (like pointing a different symref than HEAD outside of refs/heads/). Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'builtin-symbolic-ref.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/builtin-symbolic-ref.c b/builtin-symbolic-ref.c
index bfc78bb..cafc4eb 100644
--- a/builtin-symbolic-ref.c
+++ b/builtin-symbolic-ref.c
@@ -44,6 +44,9 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
check_symref(argv[0], quiet);
case 2:
+ if (!strcmp(argv[0], "HEAD") &&
+ prefixcmp(argv[1], "refs/heads/"))
+ die("Refusing to point HEAD outside of refs/heads/");
create_symref(argv[0], argv[1], msg);