print errno when reporting a system call error

diff --git a/t/t3007-ls-files-recurse-submodules.sh b/t/t3007-ls-files-recurse-submodules.sh
index 4cf6ccf5a8eadac4cc0ebb8b3091f1f3befa73a9..ebb956fd16ccce2536591da021239453da999140 100755 (executable)
--- a/t/t3007-ls-files-recurse-submodules.sh
+++ b/t/t3007-ls-files-recurse-submodules.sh
@@ -77,10 +77,22 @@ test_expect_success 'ls-files recurses more than 1 level' '
        git -C submodule/subsub commit -m "add d" &&
        git -C submodule submodule add ./subsub &&
        git -C submodule commit -m "added subsub" &&
+       git submodule absorbgitdirs &&
        git ls-files --recurse-submodules >actual &&
        test_cmp expect actual
 '
 
+test_expect_success 'ls-files works with GIT_DIR' '
+       cat >expect <<-\EOF &&
+       .gitmodules
+       c
+       subsub/d
+       EOF
+
+       git --git-dir=submodule/.git ls-files --recurse-submodules >actual &&
+       test_cmp expect actual
+'
+
 test_expect_success '--recurse-submodules and pathspecs setup' '
        echo e >submodule/subsub/e.txt &&
        git -C submodule/subsub add e.txt &&