print errno when reporting a system call error

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index c2706fe4723778b68b9673fd85267ea475f791f2..1b8f1dbd3a3d8a59a74888155d36d0d49e94cb64 100755 (executable)
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh
@@ -38,6 +38,14 @@ test_expect_success 'submodule update aborts on missing .gitmodules file' '
        test_i18ngrep "Submodule path .sub. not initialized" actual
 '
 
+test_expect_success 'submodule update aborts on missing gitmodules url' '
+       test_when_finished "git update-index --remove sub" &&
+       git update-index --add --cacheinfo 160000,$(git rev-parse HEAD),sub &&
+       test_when_finished "rm -f .gitmodules" &&
+       git config -f .gitmodules submodule.s.path sub &&
+       test_must_fail git submodule init
+'
+
 test_expect_success 'configuration parsing' '
        test_when_finished "rm -f .gitmodules" &&
        cat >.gitmodules <<-\EOF &&