push: rename config variable for more general use

diff --git a/remote.c b/remote.c
index 51016831b94d8e11f1397bf250a01c986a5d13f5..aa6b7199b7c0a5abec5dfb697fef6f03f2b419b2 100644 (file)
--- a/remote.c
+++ b/remote.c
@@ -1281,9 +1281,21 @@ int match_push_refs(struct ref *src, struct ref **dst,
 
 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;
 }
 
@@ -1293,6 +1305,8 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
        struct ref *ref;
 
        for (ref = remote_refs; ref; ref = ref->next) {
+               int force_ref_update = ref->force || force_update;
+
                if (ref->peer_ref)
                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
                else if (!send_mirror)
@@ -1305,36 +1319,55 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
                        continue;
                }
 
-               /* This part determines what can overwrite what.
-                * The rules are:
+               /*
+                * The below logic determines whether an individual
+                * refspec A:B can be pushed.  The push will succeed
+                * if any of the following are true:
+                *
+                * (1) the remote reference B does not exist
                 *
-                * (0) you can always use --force or +A:B notation to
-                *     selectively force individual ref pairs.
+                * (2) the remote reference B is being removed (i.e.,
+                *     pushing :B where no source is specified)
                 *
-                * (1) if the old thing does not exist, it is OK.
+                * (3) the update meets all fast-forwarding criteria:
                 *
-                * (2) if you do not have the old thing, you are not allowed
-                *     to overwrite it; you would not know what you are losing
-                *     otherwise.
+                *     (a) the destination is not under refs/tags/
+                *     (b) the old is a commit
+                *     (c) the new is a descendant of the old
                 *
-                * (3) if both new and old are commit-ish, and new is a
-                *     descendant of old, it is OK.
+                *     NOTE: We must actually have the old object in
+                *     order to overwrite it in the remote reference,
+                *     and the new object must be commit-ish.  These are
+                *     implied by (b) and (c) respectively.
                 *
-                * (4) regardless of all of the above, removing :B is
-                *     always allowed.
+                * (4) it is forced using the +A:B notation, or by
+                *     passing the --force argument
                 */
 
                ref->not_forwardable = !is_forwardable(ref);
 
-               ref->nonfastforward =
+               ref->update =
                        !ref->deletion &&
-                       !is_null_sha1(ref->old_sha1) &&
-                       (!has_sha1_file(ref->old_sha1)
-                         || !ref_newer(ref->new_sha1, ref->old_sha1));
-
-               if (ref->nonfastforward && !ref->force && !force_update) {
-                       ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
-                       continue;
+                       !is_null_sha1(ref->old_sha1);
+
+               if (ref->update) {
+                       ref->nonfastforward =
+                               !has_sha1_file(ref->old_sha1)
+                                 || !ref_newer(ref->new_sha1, ref->old_sha1);
+
+                       if (ref->not_forwardable) {
+                               ref->requires_force = 1;
+                               if (!force_ref_update) {
+                                       ref->status = REF_STATUS_REJECT_ALREADY_EXISTS;
+                                       continue;
+                               }
+                       } else if (ref->nonfastforward) {
+                               ref->requires_force = 1;
+                               if (!force_ref_update) {
+                                       ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
+                                       continue;
+                               }
+                       }
                }
        }
 }