t6001: avoid direct file system access

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t6001-rev-list-graft.sh b/t/t6001-rev-list-graft.sh
index 90d93f77fa79c2694ebd9b2229c8620859e6a36a..7294147334a92e6be082ad57177adb6e0857facc 100755 (executable)
--- a/t/t6001-rev-list-graft.sh
+++ b/t/t6001-rev-list-graft.sh
@@ -23,7 +23,8 @@ test_expect_success setup '
        git commit -a -m "Third in one history." &&
        A2=$(git rev-parse --verify HEAD) &&
 
-       rm -f .git/refs/heads/main .git/index &&
+       git update-ref -d refs/heads/main &&
+       rm -f .git/index &&
 
        echo >fileA fileA again &&
        echo >subdir/fileB fileB again &&