log: diagnose empty HEAD more clearly

diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 1b2e981a0011d520d1a7d8bb8d0a5fd7892bacc4..19277dd3618019a97ef0631cc4a808f5e5bcc653 100755 (executable)
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -871,4 +871,18 @@ test_expect_success 'log --graph --no-walk is forbidden' '
        test_must_fail git log --graph --no-walk
 '
 
+test_expect_success 'log diagnoses bogus HEAD' '
+       git init empty &&
+       test_must_fail git -C empty log 2>stderr &&
+       test_i18ngrep does.not.have.any.commits stderr &&
+       echo 1234abcd >empty/.git/refs/heads/master &&
+       test_must_fail git -C empty log 2>stderr &&
+       test_i18ngrep broken stderr &&
+       echo "ref: refs/heads/invalid.lock" >empty/.git/HEAD &&
+       test_must_fail git -C empty log 2>stderr &&
+       test_i18ngrep broken stderr &&
+       test_must_fail git -C empty log --default totally-bogus 2>stderr &&
+       test_i18ngrep broken stderr
+'
+
 test_done