linux-kernel - Re: [PATCH] checkpatch.pl: Relax commit ID check to allow more than 12 chars

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Message-ID: <Y9+HnJ9ldBZP16zp@probook>
Date:   Sun, 5 Feb 2023 11:40:28 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Joe Perches <joe@...ches.com>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: Re: [PATCH] checkpatch.pl: Relax commit ID check to allow more than
 12 chars

On Sat, Feb 04, 2023 at 08:57:59AM -0800, Joe Perches wrote:
> On Sun, 2023-01-29 at 09:52 -0800, Joe Perches wrote:
> > On Sun, 2023-01-29 at 13:34 +0100, Jonathan Neuschäfer wrote:
> > > By now, `git log --pretty=%h` (on my copy of linux.git) prints commit
> > > hashes with 13 digits, because of the number of objects.
> > > 
> > > Relax the rule in checkpatch.pl to allow a few more digits (up to 16).
> > 
> > NAK without updating the process docs first.
> 
> btw: it looks like 12 will still be sufficient for awhile yet
> 
> $ git count
> total 1154908
> $ git -c core.abbrev=5 log --pretty=format:%h | \
>   perl -nE 'chomp;say length' | sort | uniq -c | sort -n -k2
>     198 5
>  664613 6
>  450955 7
>   36667 8
>    2312 9
>     155 10
>       8 11

Ok, I get similar stats on my tree (which includes linux-next and a few
other remotes).

However, git's default heuristic for %h length uses 13 digits here, so I
think other people might get 13 digits as well. I could force git to use
less digits than it naturally would, by setting core.abbrev=12 (and
document this idea in the documentation), but that doesn't seem nice.
Therefore, I still think allowing a few more digits is a good idea.


Thanks,
Jonathan

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