Re: [PATCH v3 6/6] Make sure that index-pack --strict checks tag objects

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> When our toolset has become too tight without leaving enough escape
> hatch to hinder further development, it is very sensible to at least
> think about adding a new "--for-debug" option to hash-object and
> pack-objects that allows us to deliberately create broken
> datastreams to test against.
>
> I think peff recently added helpers to t5303 to allow us test
> corrupt pack streams, which is a way different from what you
> envisioned above (i.e. "actively break pack-index") to test
> breakages like the ones you were trying to test here.
>
> Having said all that, I do think the series that added new warnings,
> errors and a test for the new warnings is an improvement without a
> test for the new errors.  So let's queue this, see if somebody comes
> up a way to check for these error detection codepath on top of this
> series.

It wasn't too painful to do one of them, and the result looks rather
nice.  It lets us add this patch on top of your series.

-- >8 --
Subject: [PATCH] t1450: make sure fsck detects a malformed tagger line

With "hash-object --literally", write a tag object that is not
supposed to pass one of the new checks added to "fsck", and make
sure that the new check catches the breakage.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t1450-fsck.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index 9118253..6ecb844 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -234,6 +234,25 @@ test_expect_success 'tag with incorrect tag name & missing tagger' '
 	grep "expected .tagger. line" out
 '
 
+test_expect_success 'tag with bad tagger' '
+	sha=$(git rev-parse HEAD) &&
+	cat >wrong-tag <<-EOF &&
+	object $sha
+	type commit
+	tag not-quite-wrong
+	tagger Bad Tagger Name
+
+	This is an invalid tag.
+	EOF
+
+	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
+	test_when_finished "remove_object $tag" &&
+	echo $tag >.git/refs/tags/wrong &&
+	test_when_finished "git update-ref -d refs/tags/wrong" &&
+	test_must_fail git fsck --tags 2>out &&
+	grep "error in tag .*: invalid author/committer" out
+'
+
 test_expect_success 'cleaned up' '
 	git fsck >actual 2>&1 &&
 	test_cmp empty actual
-- 
2.1.0-459-g1bc3b2b