transport: parse report options for tracking refs

When pushing a pseudo reference (such as "refs/for/master/topic"), may
create or update one or more references.  The real names of the
references will be stored in the report options.  Parse report options
to create or update remote-tracking branches properly.

Signed-off-by: Jiang Xin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jiangxin

t/t5411/test-0036-report-multi-rewrite-for-one-ref.sh

@@ -78,10 +78,14 @@ test_expect_success "proc-receive: check remote-tracking #1 ($PROTOCOL)" '
 		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
 	make_user_friendly_and_stable_output <out >actual &&
 	cat >expect <<-EOF &&
-	<COMMIT-A> refs/t/for/master/topic
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-B> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/master/topic
 	EOF
 	test_cmp expect actual &&
-	git -C workbench update-ref -d refs/t/for/master/topic
+	git -C workbench update-ref -d refs/t/for/master/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
 '
 
 test_expect_success "setup proc-receive hook (multiple rewrites for one ref, no refname for the 2nd rewrite, $PROTOCOL)" '
@@ -151,10 +155,14 @@ test_expect_success "proc-receive: check remote-tracking #2 ($PROTOCOL)" '
 		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
 	make_user_friendly_and_stable_output <out >actual &&
 	cat >expect <<-EOF &&
-	<COMMIT-A> refs/t/for/master/topic
+	<COMMIT-A> refs/t/changes/24/124/1
+	<COMMIT-A> refs/t/changes/25/125/1
+	<COMMIT-B> refs/t/for/master/topic
 	EOF
 	test_cmp expect actual &&
-	git -C workbench update-ref -d refs/t/for/master/topic
+	git -C workbench update-ref -d refs/t/for/master/topic &&
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/1
 '
 
 test_expect_success "setup proc-receive hook (multiple rewrites for one ref, $PROTOCOL)" '
@@ -210,8 +218,10 @@ test_expect_success "proc-receive: check remote-tracking #3 ($PROTOCOL)" '
 		grep -v -e refs/remotes -e refs/heads -e refs/tags >out &&
 	make_user_friendly_and_stable_output <out >actual &&
 	cat >expect <<-EOF &&
-	<COMMIT-A> refs/t/for/master/topic
+	<COMMIT-A> refs/t/changes/23/123/1
+	<COMMIT-B> refs/t/changes/24/124/2
 	EOF
 	test_cmp expect actual &&
-	git -C workbench update-ref -d refs/t/for/master/topic
+	git -C workbench update-ref -d refs/t/changes/24/124/1 &&
+	git -C workbench update-ref -d refs/t/changes/25/125/2
 '

transport.c

@@ -437,28 +437,49 @@ int transport_refs_pushed(struct ref *ref)
 	return 0;
 }
 
-void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
+static void update_one_tracking_ref(struct remote *remote, char *refname,
+				    struct object_id *new_oid, int deletion,
+				    int verbose)
 {
 	struct refspec_item rs;
 
-	if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
-		return;
-
-	rs.src = ref->name;
+	rs.src = refname;
 	rs.dst = NULL;
 
 	if (!remote_find_tracking(remote, &rs)) {
 		if (verbose)
 			fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
-		if (ref->deletion) {
+		if (deletion)
 			delete_ref(NULL, rs.dst, NULL, 0);
-		} else
-			update_ref("update by push", rs.dst, &ref->new_oid,
+		else
+			update_ref("update by push", rs.dst, new_oid,
 				   NULL, 0, 0);
 		free(rs.dst);
 	}
 }
 
+void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
+{
+	char *refname;
+	struct object_id *new_oid;
+	struct ref_push_report *report;
+
+	if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
+		return;
+
+	report = ref->report;
+	if (!report)
+		update_one_tracking_ref(remote, ref->name, &ref->new_oid,
+					ref->deletion, verbose);
+	else
+		for (; report; report = report->next) {
+			refname = report->ref_name ? (char *)report->ref_name : ref->name;
+			new_oid = report->new_oid ? report->new_oid : &ref->new_oid;
+			update_one_tracking_ref(remote, refname, new_oid,
+						is_null_oid(new_oid), verbose);
+		}
+}
+
 static void print_ref_status(char flag, const char *summary,
 			     struct ref *to, struct ref *from, const char *msg,
 			     struct ref_push_report *report,