t1450: test fsck of packed objects

The code paths in fsck for packed and loose objects are
quite different, and it is not immediately obvious that the
packed case behaves well. In particular:

1. The fsck_loose() function always returns "0" to tell the
iterator to keep checking more objects. Whereas
fsck_obj_buffer() (which handles packed objects)
returns -1. This is OK, because the callback machinery
for verify_pack() does not stop when it sees a non-zero
return.

2. The fsck_loose() function sets the ERROR_OBJECT bit
when fsck_obj() fails, whereas fsck_obj_buffer() sets it
only when it sees a corrupt object. This turns out not
to matter. We don't actually do anything with this bit
except exit the program with a non-zero code, and that
is handled already by the non-zero return from the
function.

So there are no bugs here, but it was certainly confusing to
me. And we do not test either of the properties in t1450
(neither that a non-corruption error will caused a non-zero
exit for a packed object, nor that we keep going after
seeing the first error). Let's test both of those
conditions, so that we'll notice if any of those assumptions
becomes invalid.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index f95174c9d86c972118a964efcf7b68f735c2605d..c39d4212091b5f35819b762e709e908358d6b069 100755 (executable)
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -560,4 +560,25 @@ test_expect_success 'alternate objects are correctly blamed' '
        grep alt.git out
 '
 
+test_expect_success 'fsck errors in packed objects' '
+       git cat-file commit HEAD >basis &&
+       sed "s/</one/" basis >one &&
+       sed "s/</foo/" basis >two &&
+       one=$(git hash-object -t commit -w one) &&
+       two=$(git hash-object -t commit -w two) &&
+       pack=$(
+               {
+                       echo $one &&
+                       echo $two
+               } | git pack-objects .git/objects/pack/pack
+       ) &&
+       test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
+       remove_object $one &&
+       remove_object $two &&
+       test_must_fail git fsck 2>out &&
+       grep "error in commit $one.* - bad name" out &&
+       grep "error in commit $two.* - bad name" out &&
+       ! grep corrupt out
+'
+
 test_done