t9300: factor out portable "head -c" replacement

diff --git a/t/t9800-git-p4-basic.sh b/t/t9800-git-p4-basic.sh
index 90d41ed954c829bfb3735f3cea9db336f74adb81..0730f18d0f83f4145c5a0dbfde784d71bdc57a1d 100755 (executable)
--- a/t/t9800-git-p4-basic.sh
+++ b/t/t9800-git-p4-basic.sh
@@ -241,6 +241,22 @@ test_expect_success 'unresolvable host in P4PORT should display error' '
        )
 '
 
+test_expect_success 'submit from detached head' '
+       test_when_finished cleanup_git &&
+       git p4 clone --dest="$git" //depot &&
+       (
+               cd "$git" &&
+               git checkout p4/master &&
+               >detached_head_test &&
+               git add detached_head_test &&
+               git commit -m "add detached_head" &&
+               git config git-p4.skipSubmitEdit true &&
+               git p4 submit &&
+               git p4 rebase &&
+               git log p4/master | grep detached_head
+       )
+'
+
 test_expect_success 'kill p4d' '
        kill_p4d
 '