Merge branch 'jc/pull-signed-tag'

* jc/pull-signed-tag:
  commit-tree: teach -m/-F options to read logs from elsewhere
  commit-tree: update the command line parsing
  commit: teach --amend to carry forward extra headers
  merge: force edit and no-ff mode when merging a tag object
  commit: copy merged signed tags to headers of merge commit
  merge: record tag objects without peeling in MERGE_HEAD
  merge: make usage of commit->util more extensible
  fmt-merge-msg: Add contents of merged tag in the merge message
  fmt-merge-msg: package options into a structure
  fmt-merge-msg: avoid early returns
  refs DWIMmery: use the same rule for both "git fetch" and others
  fetch: allow "git fetch $there v1.0" to fetch a tag
  merge: notice local merging of tags and keep it unwrapped
  fetch: do not store peeled tag object names in FETCH_HEAD
  Split GPG interface into its own helper library

Conflicts:
	builtin/fmt-merge-msg.c
	builtin/merge.c

1 files changed, 50 insertions, 45 deletions

diff --git a/builtin/merge.c b/builtin/merge.c
index 3fc54923b..7349396d5 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -409,20 +409,10 @@ static void finish(struct commit *head_commit,
 	strbuf_release(&reflog_message);
 }
 
-static struct object *want_commit(const char *name)
-{
-	struct object *obj;
-	unsigned char sha1[20];
-	if (get_sha1(name, sha1))
-		return NULL;
-	obj = parse_object(sha1);
-	return peel_to_type(name, 0, obj, OBJ_COMMIT);
-}
-
 /* Get the name for the merge commit's message. */
 static void merge_name(const char *remote, struct strbuf *msg)
 {
-	struct object *remote_head;
+	struct commit *remote_head;
 	unsigned char branch_head[20], buf_sha[20];
 	struct strbuf buf = STRBUF_INIT;
 	struct strbuf bname = STRBUF_INIT;
@@ -434,7 +424,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
 	remote = bname.buf;
 
 	memset(branch_head, 0, sizeof(branch_head));
-	remote_head = want_commit(remote);
+	remote_head = get_merge_parent(remote);
 	if (!remote_head)
 		die(_("'%s' does not point to a commit"), remote);
 
@@ -444,6 +434,11 @@ static void merge_name(const char *remote, struct strbuf *msg)
 				    sha1_to_hex(branch_head), remote);
 			goto cleanup;
 		}
+		if (!prefixcmp(found_ref, "refs/tags/")) {
+			strbuf_addf(msg, "%s\t\ttag '%s' of .\n",
+				    sha1_to_hex(branch_head), remote);
+			goto cleanup;
+		}
 		if (!prefixcmp(found_ref, "refs/remotes/")) {
 			strbuf_addf(msg, "%s\t\tremote-tracking branch '%s' of .\n",
 				    sha1_to_hex(branch_head), remote);
@@ -485,7 +480,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
 		if (resolve_ref(truname.buf, buf_sha, 1, NULL)) {
 			strbuf_addf(msg,
 				    "%s\t\tbranch '%s'%s of .\n",
-				    sha1_to_hex(remote_head->sha1),
+				    sha1_to_hex(remote_head->object.sha1),
 				    truname.buf + 11,
 				    (early ? " (early part)" : ""));
 			strbuf_release(&truname);
@@ -515,7 +510,7 @@ static void merge_name(const char *remote, struct strbuf *msg)
 		goto cleanup;
 	}
 	strbuf_addf(msg, "%s\t\tcommit '%s'\n",
-		sha1_to_hex(remote_head->sha1), remote);
+		sha1_to_hex(remote_head->object.sha1), remote);
 cleanup:
 	strbuf_release(&buf);
 	strbuf_release(&bname);
@@ -716,7 +711,7 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
 				die(_("Unknown option for merge-recursive: -X%s"), xopts[x]);
 
 		o.branch1 = head_arg;
-		o.branch2 = remoteheads->item->util;
+		o.branch2 = merge_remote_util(remoteheads->item)->name;
 
 		for (j = common; j; j = j->next)
 			commit_list_insert(j->item, &reversed);
@@ -1056,9 +1051,16 @@ static void write_merge_state(void)
 	struct commit_list *j;
 	struct strbuf buf = STRBUF_INIT;
 
-	for (j = remoteheads; j; j = j->next)
-		strbuf_addf(&buf, "%s\n",
-			sha1_to_hex(j->item->object.sha1));
+	for (j = remoteheads; j; j = j->next) {
+		unsigned const char *sha1;
+		struct commit *c = j->item;
+		if (c->util && merge_remote_util(c)->obj) {
+			sha1 = merge_remote_util(c)->obj->sha1;
+		} else {
+			sha1 = c->object.sha1;
+		}
+		strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
+	}
 	filename = git_path("MERGE_HEAD");
 	fd = open(filename, O_WRONLY | O_CREAT, 0666);
 	if (fd < 0)
@@ -1197,7 +1199,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		argv += 2;
 		argc -= 2;
 	} else if (!head_commit) {
-		struct object *remote_head;
+		struct commit *remote_head;
 		/*
 		 * If the merged head is a valid one there is no reason
 		 * to forbid "git merge" into a branch yet to be born.
@@ -1211,12 +1213,12 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		if (!allow_fast_forward)
 			die(_("Non-fast-forward commit does not make sense into "
 			    "an empty head"));
-		remote_head = want_commit(argv[0]);
+		remote_head = get_merge_parent(argv[0]);
 		if (!remote_head)
 			die(_("%s - not something we can merge"), argv[0]);
-		read_empty(remote_head->sha1, 0);
-		update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0,
-				DIE_ON_ERR);
+		read_empty(remote_head->object.sha1, 0);
+		update_ref("initial pull", "HEAD", remote_head->object.sha1,
+			   NULL, 0, DIE_ON_ERR);
 		return 0;
 	} else {
 		struct strbuf merge_names = STRBUF_INIT;
@@ -1225,19 +1227,20 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		head_arg = "HEAD";
 
 		/*
-		 * All the rest are the commits being merged;
-		 * prepare the standard merge summary message to
-		 * be appended to the given message.  If remote
-		 * is invalid we will die later in the common
-		 * codepath so we discard the error in this
-		 * loop.
+		 * All the rest are the commits being merged; prepare
+		 * the standard merge summary message to be appended
+		 * to the given message.
 		 */
 		for (i = 0; i < argc; i++)
 			merge_name(argv[i], &merge_names);
 
 		if (!have_message || shortlog_len) {
-			fmt_merge_msg(&merge_names, &merge_msg, !have_message,
-				      shortlog_len);
+			struct fmt_merge_msg_opts opts;
+			memset(&opts, 0, sizeof(opts));
+			opts.add_title = !have_message;
+			opts.shortlog_len = shortlog_len;
+
+			fmt_merge_msg(&merge_names, &merge_msg, &opts);
 			if (merge_msg.len)
 				strbuf_setlen(&merge_msg, merge_msg.len - 1);
 		}
@@ -1254,19 +1257,20 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 	strbuf_reset(&buf);
 
 	for (i = 0; i < argc; i++) {
-		struct object *o;
-		struct commit *commit;
-
-		o = want_commit(argv[i]);
-		if (!o)
+		struct commit *commit = get_merge_parent(argv[i]);
+		if (!commit)
 			die(_("%s - not something we can merge"), argv[i]);
-		commit = lookup_commit(o->sha1);
-		commit->util = (void *)argv[i];
 		remotes = &commit_list_insert(commit, remotes)->next;
-
-		strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1));
+		strbuf_addf(&buf, "GITHEAD_%s",
+			    sha1_to_hex(commit->object.sha1));
 		setenv(buf.buf, argv[i], 1);
 		strbuf_reset(&buf);
+		if (merge_remote_util(commit) &&
+		    merge_remote_util(commit)->obj &&
+		    merge_remote_util(commit)->obj->type == OBJ_TAG) {
+			option_edit = 1;
+			allow_fast_forward = 0;
+		}
 	}
 
 	if (!use_strategies) {
@@ -1310,7 +1314,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 			!hashcmp(common->item->object.sha1, head_commit->object.sha1)) {
 		/* Again the most common case of merging one remote. */
 		struct strbuf msg = STRBUF_INIT;
-		struct object *o;
+		struct commit *commit;
 		char hex[41];
 
 		strcpy(hex, find_unique_abbrev(head_commit->object.sha1, DEFAULT_ABBREV));
@@ -1324,14 +1328,15 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 		if (have_message)
 			strbuf_addstr(&msg,
 				" (no commit created; -m option ignored)");
-		o = want_commit(sha1_to_hex(remoteheads->item->object.sha1));
-		if (!o)
+		commit = remoteheads->item;
+		if (!commit)
 			return 1;
 
-		if (checkout_fast_forward(head_commit->object.sha1, remoteheads->item->object.sha1))
+		if (checkout_fast_forward(head_commit->object.sha1,
+					  commit->object.sha1))
 			return 1;
 
-		finish(head_commit, o->sha1, msg.buf);
+		finish(head_commit, commit->object.sha1, msg.buf);
 		drop_save();
 		return 0;
 	} else if (!remoteheads->next && common->next)