tree 3da17f344439eceec6dbf8c8bc13fc923a8603e6
parent 4337b5856f88f18da47c176e3cbc95a35627044c
author Jeff King <peff@peff.net> 1343487989 -0400
committer Junio C Hamano <gitster@pobox.com> 1343600048 -0700

fsck: detect null sha1 in tree entries

Short of somebody happening to beat the 1 in 2^160 odds of
actually generating content that hashes to the null sha1, we
should never see this value in a tree entry. So let's have
fsck warn if it it seen.

As in the previous commit, we test both blob and submodule
entries to future-proof the test suite against the
implementation depending on connectivity to notice the
error.

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