On Wed, Jan 16, 2013 at 02:32:03PM +0100, Max Horn wrote:
> With git 1.8.1, I get this message:
>
> ! [rejected] master -> master (non-fast-forward)
> [...]
> But with next, I get this:
>
> ! [rejected] master -> master (already exists)
Thanks for the detailed report. I was able to reproduce easily here.
The problem is the logic in is_forwardable:
static inline int is_forwardable(struct ref* ref)
{
struct object *o;
if (!prefixcmp(ref->name, "refs/tags/"))
return 0;
/* old object must be a commit */
o = parse_object(ref->old_sha1);
if (!o || o->type != OBJ_COMMIT)
return 0;
/* new object must be commit-ish */
o = deref_tag(parse_object(ref->new_sha1), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
return 0;
return 1;
}
The intent is to allow fast-forward only between objects that both point
to commits eventually. But we are doing this check on the client, which
does not necessarily have the object for ref->old_sha1 at all. So it
cannot know the type, and cannot enforce this condition accurately.
I.e., we trigger the "!o" branch after the parse_object in your example.
-Peff
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