Merge branch 'mh/war-on-extra-refs'

* mh/war-on-extra-refs:
  refs: remove the extra_refs API
  clone: do not add alternate references to extra_refs
  everything_local(): mark alternate refs as complete
  fetch-pack.c: inline insert_alternate_refs()
  fetch-pack.c: rename some parameters from "path" to "refname"
  clone.c: move more code into the "if (refs)" conditional
  t5700: document a failure of alternates to affect fetch

Author: gitster

builtin/clone.c

@@ -232,9 +232,6 @@ static int add_one_reference(struct string_list_item *item, void *cb_data)
 {
 	char *ref_git;
 	struct strbuf alternate = STRBUF_INIT;
-	struct remote *remote;
-	struct transport *transport;
-	const struct ref *extra;
 
 	/* Beware: real_path() and mkpath() return static buffer */
 	ref_git = xstrdup(real_path(item->string));
@@ -249,14 +246,6 @@ static int add_one_reference(struct string_list_item *item, void *cb_data)
 	strbuf_addf(&alternate, "%s/objects", ref_git);
 	add_to_alternates_file(alternate.buf);
 	strbuf_release(&alternate);
-
-	remote = remote_get(ref_git);
-	transport = transport_get(remote, ref_git);
-	for (extra = transport_get_remote_refs(transport); extra;
-	     extra = extra->next)
-		add_extra_ref(extra->name, extra->old_sha1, 0);
-
-	transport_disconnect(transport);
 	free(ref_git);
 	return 0;
 }
@@ -500,7 +489,6 @@ static void update_remote_refs(const struct ref *refs,
 			       const char *msg)
 {
 	if (refs) {
-		clear_extra_refs();
 		write_remote_refs(mapped_refs);
 		if (option_single_branch)
 			write_followtags(refs, msg);
@@ -813,28 +801,28 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	}
 
 	refs = transport_get_remote_refs(transport);
-	mapped_refs = refs ? wanted_peer_refs(refs, refspec) : NULL;
 
-	/*
-	 * transport_get_remote_refs() may return refs with null sha-1
-	 * in mapped_refs (see struct transport->get_refs_list
-	 * comment). In that case we need fetch it early because
-	 * remote_head code below relies on it.
-	 *
-	 * for normal clones, transport_get_remote_refs() should
-	 * return reliable ref set, we can delay cloning until after
-	 * remote HEAD check.
-	 */
-	for (ref = refs; ref; ref = ref->next)
-		if (is_null_sha1(ref->old_sha1)) {
-			complete_refs_before_fetch = 0;
-			break;
-		}
+	if (refs) {
+		mapped_refs = wanted_peer_refs(refs, refspec);
+		/*
+		 * transport_get_remote_refs() may return refs with null sha-1
+		 * in mapped_refs (see struct transport->get_refs_list
+		 * comment). In that case we need fetch it early because
+		 * remote_head code below relies on it.
+		 *
+		 * for normal clones, transport_get_remote_refs() should
+		 * return reliable ref set, we can delay cloning until after
+		 * remote HEAD check.
+		 */
+		for (ref = refs; ref; ref = ref->next)
+			if (is_null_sha1(ref->old_sha1)) {
+				complete_refs_before_fetch = 0;
+				break;
+			}
 
-	if (!is_local && !complete_refs_before_fetch && refs)
-		transport_fetch_refs(transport, mapped_refs);
+		if (!is_local && !complete_refs_before_fetch)
+			transport_fetch_refs(transport, mapped_refs);
 
-	if (refs) {
 		remote_head = find_ref_by_name(refs, "HEAD");
 		remote_head_points_at =
 			guess_remote_head(remote_head, mapped_refs, 0);
@@ -852,6 +840,7 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
 	}
 	else {
 		warning(_("You appear to have cloned an empty repository."));
+		mapped_refs = NULL;
 		our_head_points_at = NULL;
 		remote_head_points_at = NULL;
 		remote_head = NULL;

builtin/fetch-pack.c

@@ -58,19 +58,19 @@ static void rev_list_push(struct commit *commit, int mark)
 	}
 }
 
-static int rev_list_insert_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
+static int rev_list_insert_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
-	struct object *o = deref_tag(parse_object(sha1), path, 0);
+	struct object *o = deref_tag(parse_object(sha1), refname, 0);
 
 	if (o && o->type == OBJ_COMMIT)
 		rev_list_push((struct commit *)o, SEEN);
 
 	return 0;
 }
 
-static int clear_marks(const char *path, const unsigned char *sha1, int flag, void *cb_data)
+static int clear_marks(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
-	struct object *o = deref_tag(parse_object(sha1), path, 0);
+	struct object *o = deref_tag(parse_object(sha1), refname, 0);
 
 	if (o && o->type == OBJ_COMMIT)
 		clear_commit_marks((struct commit *)o,
@@ -256,11 +256,6 @@ static void insert_one_alternate_ref(const struct ref *ref, void *unused)
 	rev_list_insert_ref(NULL, ref->old_sha1, 0, NULL);
 }
 
-static void insert_alternate_refs(void)
-{
-	for_each_alternate_ref(insert_one_alternate_ref, NULL);
-}
-
 #define INITIAL_FLUSH 16
 #define PIPESAFE_FLUSH 32
 #define LARGE_FLUSH 1024
@@ -295,7 +290,7 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 	marked = 1;
 
 	for_each_ref(rev_list_insert_ref, NULL);
-	insert_alternate_refs();
+	for_each_alternate_ref(insert_one_alternate_ref, NULL);
 
 	fetching = 0;
 	for ( ; refs ; refs = refs->next) {
@@ -493,7 +488,7 @@ static int find_common(int fd[2], unsigned char *result_sha1,
 
 static struct commit_list *complete;
 
-static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
+static int mark_complete(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
 	struct object *o = parse_object(sha1);
 
@@ -586,6 +581,11 @@ static void filter_refs(struct ref **refs, int nr_match, char **match)
 	*refs = newlist;
 }
 
+static void mark_alternate_complete(const struct ref *ref, void *unused)
+{
+	mark_complete(NULL, ref->old_sha1, 0, NULL);
+}
+
 static int everything_local(struct ref **refs, int nr_match, char **match)
 {
 	struct ref *ref;
@@ -614,6 +614,7 @@ static int everything_local(struct ref **refs, int nr_match, char **match)
 
 	if (!args.depth) {
 		for_each_ref(mark_complete, NULL);
+		for_each_alternate_ref(mark_alternate_complete, NULL);
 		if (cutoff)
 			mark_recent_complete_commits(cutoff);
 	}

refs.c

@@ -183,12 +183,6 @@ static struct ref_cache {
 
 static struct ref_entry *current_ref;
 
-/*
- * Never call sort_ref_array() on the extra_refs, because it is
- * allowed to contain entries with duplicate names.
- */
-static struct ref_array extra_refs;
-
 static void clear_ref_array(struct ref_array *array)
 {
 	int i;
@@ -289,16 +283,6 @@ static void read_packed_refs(FILE *f, struct ref_array *array)
 	}
 }
 
-void add_extra_ref(const char *refname, const unsigned char *sha1, int flag)
-{
-	add_ref(&extra_refs, create_ref_entry(refname, sha1, flag, 0));
-}
-
-void clear_extra_refs(void)
-{
-	clear_ref_array(&extra_refs);
-}
-
 static struct ref_array *get_packed_refs(struct ref_cache *refs)
 {
 	if (!refs->did_packed) {
@@ -733,16 +717,11 @@ int peel_ref(const char *refname, unsigned char *sha1)
 static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
 			   int trim, int flags, void *cb_data)
 {
-	int retval = 0, i, p = 0, l = 0;
+	int retval = 0, p = 0, l = 0;
 	struct ref_cache *refs = get_ref_cache(submodule);
 	struct ref_array *packed = get_packed_refs(refs);
 	struct ref_array *loose = get_loose_refs(refs);
 
-	struct ref_array *extra = &extra_refs;
-
-	for (i = 0; i < extra->nr; i++)
-		retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]);
-
 	sort_ref_array(packed);
 	sort_ref_array(loose);
 	while (p < packed->nr && l < loose->nr) {

refs.h

@@ -56,14 +56,6 @@ extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refn
  */
 extern void add_packed_ref(const char *refname, const unsigned char *sha1);
 
-/*
- * Extra refs will be listed by for_each_ref() before any actual refs
- * for the duration of this process or until clear_extra_refs() is
- * called. Only extra refs added before for_each_ref() is called will
- * be listed on a given call of for_each_ref().
- */
-extern void add_extra_ref(const char *refname, const unsigned char *sha1, int flags);
-extern void clear_extra_refs(void);
 extern int ref_exists(const char *);
 
 extern int peel_ref(const char *refname, unsigned char *sha1);

t/t5700-clone-reference.sh

@@ -52,13 +52,13 @@ test_cmp expected current'
 
 cd "$base_dir"
 
-rm -f "$U"
+rm -f "$U.D"
 
 test_expect_success 'cloning with reference (no -l -s)' \
-'GIT_DEBUG_SEND_PACK=3 git clone --reference B "file://$(pwd)/A" D 3>"$U"'
+'GIT_DEBUG_SEND_PACK=3 git clone --reference B "file://$(pwd)/A" D 3>"$U.D"'
 
 test_expect_success 'fetched no objects' \
-'! grep "^want" "$U"'
+'! grep "^want" "$U.D"'
 
 cd "$base_dir"
 
@@ -153,4 +153,32 @@ test_expect_success 'clone with reference from a tagged repository' '
 	git clone --reference=A A I
 '
 
+test_expect_success 'prepare branched repository' '
+	git clone A J &&
+	(
+		cd J &&
+		git checkout -b other master^ &&
+		echo other >otherfile &&
+		git add otherfile &&
+		git commit -m other &&
+		git checkout master
+	)
+'
+
+rm -f "$U.K"
+
+test_expect_success 'fetch with incomplete alternates' '
+	git init K &&
+	echo "$base_dir/A/.git/objects" >K/.git/objects/info/alternates &&
+	(
+		cd K &&
+		git remote add J "file://$base_dir/J" &&
+		GIT_DEBUG_SEND_PACK=3 git fetch J 3>"$U.K"
+	) &&
+	master_object=$(cd A && git for-each-ref --format="%(objectname)" refs/heads/master) &&
+	! grep "^want $master_object" "$U.K" &&
+	tag_object=$(cd A && git for-each-ref --format="%(objectname)" refs/tags/HEAD) &&
+	! grep "^want $tag_object" "$U.K"
+'
+
 test_done