Merge branch 'jc/fetch-ignore-symref'
[git/git.git] / remote.c
index a72748c..4b1153f 100644 (file)
--- a/remote.c
+++ b/remote.c
@@ -1279,12 +1279,34 @@ int match_push_refs(struct ref *src, struct ref **dst,
        return 0;
 }
 
+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;
+}
+
 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
        int force_update)
 {
        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)
@@ -1297,34 +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->nonfastforward =
-                       !ref->deletion &&
-                       !is_null_sha1(ref->old_sha1) &&
-                       (!has_sha1_file(ref->old_sha1)
-                         || !ref_newer(ref->new_sha1, ref->old_sha1));
+               ref->not_forwardable = !is_forwardable(ref);
 
-               if (ref->nonfastforward && !ref->force && !force_update) {
-                       ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
-                       continue;
+               ref->update =
+                       !ref->deletion &&
+                       !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;
+                               }
+                       }
                }
        }
 }
@@ -1469,8 +1512,8 @@ int get_fetch_map(const struct ref *remote_refs,
 
        for (rmp = &ref_map; *rmp; ) {
                if ((*rmp)->peer_ref) {
-                       if (check_refname_format((*rmp)->peer_ref->name + 5,
-                               REFNAME_ALLOW_ONELEVEL)) {
+                       if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
+                           check_refname_format((*rmp)->peer_ref->name, 0)) {
                                struct ref *ignore = *rmp;
                                error("* Ignoring funny ref '%s' locally",
                                      (*rmp)->peer_ref->name);
@@ -1638,13 +1681,16 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
 
        base = branch->merge[0]->dst;
        base = shorten_unambiguous_ref(base, 0);
-       if (!num_theirs)
+       if (!num_theirs) {
                strbuf_addf(sb,
                        Q_("Your branch is ahead of '%s' by %d commit.\n",
                           "Your branch is ahead of '%s' by %d commits.\n",
                           num_ours),
                        base, num_ours);
-       else if (!num_ours)
+               if (advice_status_hints)
+                       strbuf_addf(sb,
+                               _("  (use \"git push\" to publish your local commits)\n"));
+       } else if (!num_ours) {
                strbuf_addf(sb,
                        Q_("Your branch is behind '%s' by %d commit, "
                               "and can be fast-forwarded.\n",
@@ -1652,7 +1698,10 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
                               "and can be fast-forwarded.\n",
                           num_theirs),
                        base, num_theirs);
-       else
+               if (advice_status_hints)
+                       strbuf_addf(sb,
+                               _("  (use \"git pull\" to update your local branch)\n"));
+       } else {
                strbuf_addf(sb,
                        Q_("Your branch and '%s' have diverged,\n"
                               "and have %d and %d different commit each, "
@@ -1662,6 +1711,10 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
                               "respectively.\n",
                           num_theirs),
                        base, num_ours, num_theirs);
+               if (advice_status_hints)
+                       strbuf_addf(sb,
+                               _("  (use \"git pull\" to merge the remote branch into yours)\n"));
+       }
        return 1;
 }