reopen_tempfile(): truncate opened file

diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh
index 423c0a475f7e87b4c32abf60ef85ccbb898eca11..2d22a17c4a7f9dcc402e89e73ce01c97ebd4ba48 100755 (executable)
--- a/t/t5310-pack-bitmaps.sh
+++ b/t/t5310-pack-bitmaps.sh
@@ -331,4 +331,17 @@ test_expect_success 'pack reuse respects --incremental' '
        git show-index <empty.idx >actual &&
        test_cmp expect actual
 '
+
+test_expect_success 'truncated bitmap fails gracefully' '
+       git repack -ad &&
+       git rev-list --use-bitmap-index --count --all >expect &&
+       bitmap=$(ls .git/objects/pack/*.bitmap) &&
+       test_when_finished "rm -f $bitmap" &&
+       head -c 512 <$bitmap >$bitmap.tmp &&
+       mv -f $bitmap.tmp $bitmap &&
+       git rev-list --use-bitmap-index --count --all >actual 2>stderr &&
+       test_cmp expect actual &&
+       test_i18ngrep corrupt stderr
+'
+
 test_done