Re: [PATCH v4 00/10] builtin/maintenance: introduce "geometric" strategy

[Patrick Steinhardt <ps@pks.im>]

On Mon, Oct 27, 2025 at 08:53:22AM -0700, Junio C Hamano wrote:
> Patrick Steinhardt <ps@pks.im> writes:
> 
> > Changes in v4:
> >   - Fix a flaky test because git-repack(1) always decides to rewrite the
> >     MIDX, even though no packs have changed. This isn't a new issue, and
> >     other maintenance tasks behave the same. So I decided to punt on it
> >     for now.
> 
> Thanks, but this round raced against 'next', so let me fabricate the
> following and queue it instead.

Thanks for doing this!

> ------- >8 -------
> From: Patrick Steinhardt <ps@pks.im>
> Date: Mon, 27 Oct 2025 09:30:50 +0100
> Subject: [PATCH] t7900: fix a flaky test due to git-repack always regenerating .midx

s/.midx/MIDX, as the MIDX file does not have a dot anywhere.

> 
> When a supposedly no-op "git repack" runs across a second boundary,
> because the command always touches the MIDX file and updates its
> timestamp, "ls -l $GIT_DIR/objects/pack/" before and after the
> operation can change, which causes such a test to fail.  Only
> compare the *.pack files in the directory before and after the
> operation to work around this flakyness.

Maybe add something like the following:

    Arguably, git-repack(1) should learn to not rewrite the MIDX in case
    we know it is already up-to-date. But this is not a new problem
    introduced via the new geometric maintenance task, so for now it
    should be good enough to paper over the issue.

But I think this looks good enough already, so please feel free to
ignore. Happy to have my authorship with either of these versions.

Thanks!

Patrick

> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> [jc: taken from diff to v4 from v3 that was already merged to 'next']
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
>  t/t7900-maintenance.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
> index 0d76693fee..614184a097 100755
> --- a/t/t7900-maintenance.sh
> +++ b/t/t7900-maintenance.sh
> @@ -500,9 +500,9 @@ test_expect_success 'geometric repacking task' '
>  
>  		# Repacking should now cause a no-op geometric repack because
>  		# no packfiles need to be combined.
> -		ls -l .git/objects/pack >before &&
> +		ls -l .git/objects/pack/*.pack >before &&
>  		run_and_verify_geometric_pack 1 &&
> -		ls -l .git/objects/pack >after &&
> +		ls -l .git/objects/pack/*.pack >after &&
>  		test_cmp before after &&
>  
>  		# This incremental change creates a new packfile that only
> -- 
> 2.51.2-678-g0cd646409c
>