send-pack: support pushing from a shallow clone via http

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/send-pack.c

@@ -209,9 +209,6 @@ int cmd_send_pack(int argc, const char **argv, const char *prefix)
 	    (send_all && args.send_mirror))
 		usage(send_pack_usage);
 
-	if (is_repository_shallow() && args.stateless_rpc)
-		die("attempt to push from a shallow repository");
-
 	if (remote_name) {
 		remote = remote_get(remote_name);
 		if (!remote_has_url(remote, dest)) {

send-pack.c

@@ -175,6 +175,21 @@ static int sideband_demux(int in, int out, void *data)
 	return ret;
 }
 
+static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
+{
+	struct strbuf *sb = cb;
+	if (graft->nr_parent == -1)
+		packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
+	return 0;
+}
+
+void advertise_shallow_grafts_buf(struct strbuf *sb)
+{
+	if (!is_repository_shallow())
+		return;
+	for_each_commit_graft(advertise_shallow_grafts_cb, sb);
+}
+
 int send_pack(struct send_pack_args *args,
 	      int fd[], struct child_process *conn,
 	      struct ref *remote_refs,
@@ -215,7 +230,7 @@ int send_pack(struct send_pack_args *args,
 	}
 
 	if (!args->dry_run)
-		advertise_shallow_grafts(out);
+		advertise_shallow_grafts_buf(&req_buf);
 
 	/*
 	 * Finally, tell the other end!
@@ -276,7 +291,7 @@ int send_pack(struct send_pack_args *args,
 	}
 
 	if (args->stateless_rpc) {
-		if (!args->dry_run && cmds_sent) {
+		if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 			packet_buf_flush(&req_buf);
 			send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 		}

t/t5538-push-shallow.sh

@@ -154,5 +154,30 @@ EOF
 	)
 '
 
+test_expect_success 'push from shallow repo via http' '
+	mv "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" shallow-upstream.git &&
+	git clone --bare --no-local full "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	(
+	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git config http.receivepack true
+	) &&
+	commit 10 &&
+	git push $HTTPD_URL/smart/repo.git +master:refs/remotes/top/master &&
+	(
+	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git fsck &&
+	git log --format=%s top/master >actual &&
+	cat <<EOF >expect &&
+10
+1
+4
+3
+2
+1
+EOF
+	test_cmp expect actual
+	)
+'
+
 stop_httpd
 test_done