receive-pack: support pushing to 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/receive-pack.c

@@ -1179,9 +1179,6 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 	if (!enter_repo(dir, 0))
 		die("'%s' does not appear to be a git repository", dir);
 
-	if (is_repository_shallow() && stateless_rpc)
-		die("attempt to push into a shallow repository");
-
 	git_config(receive_pack_config, NULL);
 
 	if (0 <= transfer_unpack_limit)

t/t5538-push-shallow.sh

@@ -16,6 +16,7 @@ test_expect_success 'setup' '
 	commit 2 &&
 	commit 3 &&
 	commit 4 &&
+	git clone . full &&
 	(
 	git init full-abc &&
 	cd full-abc &&
@@ -120,4 +121,38 @@ EOF
 	)
 '
 
+if test -n "$NO_CURL" -o -z "$GIT_TEST_HTTPD"; then
+	say 'skipping remaining tests, git built without http support'
+	test_done
+fi
+
+LIB_HTTPD_PORT=${LIB_HTTPD_PORT-'5537'}
+. "$TEST_DIRECTORY"/lib-httpd.sh
+start_httpd
+
+test_expect_success 'push to shallow repo via http' '
+	git clone --bare --no-local shallow "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	(
+	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
+	git config http.receivepack true
+	) &&
+	(
+	cd full &&
+	commit 9 &&
+	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 &&
+9
+4
+3
+EOF
+	test_cmp expect actual
+	)
+'
+
+stop_httpd
 test_done