From: Junio C Hamano <gitster@pobox.com>
Date: Sat, 25 Jul 2020 15:00:13 GMT
Subject: Re: Verbose commit message diff not showing changes from pre-commit hook
Message-ID: <xmqqr1sziqrm.fsf@gitster.c.googlers.com>
In-Reply-To: <CADv3qkGq3jA8iXsjhrqfsUX=gW+KOuLyeVgDzmku1tUpsMdvtw@mail.gmail.com>

Maxime Louet <maxime@saumon.io> writes:

> Is this expected behaviour? I find it somehow confusing that the diff
> in the commit message isn't the actual commit diff.

Since the designed purpose of pre-commit hook is to examine the
contents to be committed and reject the attempt to commit if there
is something wrong found, and Git does not expect it to munge the
contents to be committed, if the hook does so, you would get an
undefined behaviour.  So anything is totally expected at that point.

Thanks.