t9104: fix test for following larger parents

diff --git a/t/t1509-root-worktree.sh b/t/t1509-root-worktree.sh
index 335420fd87f87727f323156f461e520374b7da0b..b6977d4b390ec9a3f4f3b621db88908a2c40f689 100755 (executable)
--- a/t/t1509-root-worktree.sh
+++ b/t/t1509-root-worktree.sh
@@ -98,8 +98,16 @@ test_foobar_foobar() {
        '
 }
 
-if ! test_have_prereq POSIXPERM || ! [ -w / ]; then
-       skip_all="Dangerous test skipped. Read this test if you want to execute it"
+if ! test -w /
+then
+       skip_all="Test requiring writable / skipped. Read this test if you want to run it"
+       test_done
+fi
+
+if  test -e /refs || test -e /objects || test -e /info || test -e /hooks ||
+    test -e /.git || test -e /foo || test -e /me
+then
+       skip_all="Skip test that clobbers existing files in /"
        test_done
 fi
 
@@ -108,8 +116,9 @@ if [ "$IKNOWWHATIAMDOING" != "YES" ]; then
        test_done
 fi
 
-if [ "$UID" = 0 ]; then
-       skip_all="No you can't run this with root"
+if ! test_have_prereq NOT_ROOT
+then
+       skip_all="No you can't run this as root"
        test_done
 fi