Re: Unexpected effect of log.showSignature on tformat:%H.

From: brian m. carlson <sandals@crustytoothpaste.net>
Date: Nov 19, 2024, 22:14 UTC
Message-ID: <Zz0NsaM-KFRXzBp6@tapette.crustytoothpaste.net>
In-Reply-To: <87cyirtweq.fsf@localhost>

On 2024-11-19 at 09:17:33, Niels Möller wrote:

Show 23 quoted lines

> I had expected the output of git show -s --format='tformat:%H' to be
> always the same, and was surprised to find that scripts using this
> construction started to fail after I set log.showSignature true.
> 
> See filled out bugreport form below, including a repro script.
> 
> Regards,
> /Niels Möller
> 
> Thank you for filling out a Git bug report!
> Please answer the following questions to help us understand your issue.
> 
> What did you do before the bug happened? (Steps to reproduce your issue)
> 
>   git config --global log.showSignature true
> 
>   I'm trying this out to get to see in git log which commits are
>   signed.
> 
> What did you expect to happen? (Expected behavior)
> 
>   That git show -s --format='tformat:%H' SOME_COMMIT
>   should still output the commit hash and nothing more.

git show is a porcelain, and it can be affected by options, such as `log.showSignature`. If you want predictable behaviour, you need a plumbing command, whose behaviour isn't affected by configuration in this way. The equivalent to what you've requested is this:

    git rev-list --no-commit-header -1 -s --format='tformat:%H' SOME_COMMIT

I've confirmed that works correctly even if `log.showSignature` is set.

-- 
brian m. carlson (they/them or he/him)
Toronto, Ontario, CA