Pushes must already (by default) update to a commit-ish due to the fast-
forward check in set_ref_status_for_push().  But rejecting for not being
a fast-forward suggests the situation can be resolved with a merge.
Flag these updates (i.e., to a blob or a tree) as not forwardable so the
user is presented with more appropriate advice.

While updating *from* a tag object is potentially destructive, updating
*to* a tag is not.  Additionally, a push to the refs/tags/ hierarchy is
already excluded from fast-forwarding, and refs/heads/ is protected from
anything but commit objects by a check in write_ref_sha1().  Thus
someone fast-forwarding to a tag is probably not doing so by accident.
Since updating to a tag is benign and unlikely to cause confusion, allow
it in case someone finds the behavior useful.

Signed-off-by: Chris Rorvick <ch...@rorvick.com>
 remote.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/remote.c b/remote.c
index f5bc4e7..ee0c1e5 100644
--- a/remote.c
+++ b/remote.c
@@ -1291,6 +1291,11 @@ static inline int is_forwardable(struct ref* ref)
        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;

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