From: Jeff King <peff@peff.net>
To: Patrick Steinhardt <ps@pks.im>
Cc: git@vger.kernel.org,
"brian m. carlson" <sandals@crustytoothpaste.net>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 4/4] pack-check: fix verification of large objects
Date: Mon, 23 Feb 2026 07:58:43 -0500 [thread overview]
Message-ID: <20260223125843.GA215671@coredump.intra.peff.net> (raw)
In-Reply-To: <aZw6W_BHoYiC9RYl@pks.im>
On Mon, Feb 23, 2026 at 12:30:35PM +0100, Patrick Steinhardt wrote:
> > A more concrete test would probably be something like:
> >
> > 1. Two packs, $X and $Y, both contain the same object.
> >
> > 2. The object is corrupt in $X but not in $Y.
> >
> > 3. Running fsck detects that one copy is corrupt but the other is
> > not.
> >
> > Right now it may or may not fail depending on the ordering of the packs
> > in the MRU list (which we might be able to tweak via mtimes). But
> > hopefully in the "after" state it should deterministically complain
> > about $X.
>
> Yeah. The problem I had here is that I'm not sure whether we have any
> tools to reliably create a corrupted object, e.g. with a hash mismatch.
> I'll have a look for v2.
You can see how do_corrupt_object() in t5303 does it. It's basically
finding an offset via show-index and then writing a zero over it with
dd.
-Peff
next prev parent reply other threads:[~2026-02-23 12:58 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 9:50 [PATCH 0/4] pack-check: fix verification of large objects Patrick Steinhardt
2026-02-23 9:50 ` [PATCH 1/4] t/helper: improve "genrandom" test helper Patrick Steinhardt
2026-02-23 11:13 ` Jeff King
2026-02-23 12:20 ` Patrick Steinhardt
2026-02-23 14:01 ` Eric Sunshine
2026-02-23 9:50 ` [PATCH 2/4] object-file: adapt `stream_object_signature()` to take a stream Patrick Steinhardt
2026-02-23 10:49 ` Jeff King
2026-02-23 12:21 ` Patrick Steinhardt
2026-02-23 12:59 ` Jeff King
2026-02-23 9:50 ` [PATCH 3/4] packfile: expose function to read object stream for an offset Patrick Steinhardt
2026-02-23 11:07 ` Jeff King
2026-02-23 12:21 ` Patrick Steinhardt
2026-02-23 13:12 ` Jeff King
2026-02-23 15:59 ` Patrick Steinhardt
2026-02-23 9:50 ` [PATCH 4/4] pack-check: fix verification of large objects Patrick Steinhardt
2026-02-23 11:11 ` Jeff King
2026-02-23 11:30 ` Patrick Steinhardt
2026-02-23 12:58 ` Jeff King [this message]
2026-02-23 15:48 ` Patrick Steinhardt
2026-02-23 20:35 ` Junio C Hamano
2026-02-24 6:26 ` Patrick Steinhardt
2026-02-23 16:00 ` [PATCH v2 0/4] " Patrick Steinhardt
2026-02-23 16:00 ` [PATCH v2 1/4] t/helper: improve "genrandom" test helper Patrick Steinhardt
2026-02-23 16:00 ` [PATCH v2 2/4] object-file: adapt `stream_object_signature()` to take a stream Patrick Steinhardt
2026-02-23 16:00 ` [PATCH v2 3/4] packfile: expose function to read object stream for an offset Patrick Steinhardt
2026-02-23 16:00 ` [PATCH v2 4/4] pack-check: fix verification of large objects Patrick Steinhardt
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