From: Jeff King <peff@peff.net>
Date: Wed, 16 Dec 2020 18:46:37 GMT
Subject: Re: [PATCH] pack-redundant: fix crash when one packfile in repo
Message-ID: <X9pWDRAn7GmJgt7Z@coredump.intra.peff.net>
In-Reply-To: <20201216100952.16890-1-worldhello.net@gmail.com>

On Wed, Dec 16, 2020 at 05:09:52AM -0500, Jiang Xin wrote:

> Command `git pack-redundant --all` will crash if there is only one
> packfile in the repository.  This is because, if there is only one
> packfile in local_packs, `cmp_local_packs` will do nothing and will
> leave `pl->unique_objects` as uninitialized.

Thanks, that makes sense. And I'm glad I waited to get the opinion of
somebody much more clueful. Mine was a band-aid, but yours is hitting
the root cause and will help any other downstream code that assumes
unique_objects isn't NULL.

>  builtin/pack-redundant.c  |  6 ++++
>  t/t5323-pack-redundant.sh | 65 +++++++++++++++++++++++++++++----------

The new test coverage makes sense, I think, though as Junio noted, it
should be done independent of the $git_pack_redundant change (which will
also make the diff a lot easier to review).

-Peff