linux-kernel - Re: email as a bona fide git transport

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Date:   Fri, 18 Oct 2019 18:50:51 +0200
From:   Vegard Nossum <vegard.nossum@...cle.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     Santiago Torres Arias <santiago@....edu>, Willy Tarreau <w@....eu>,
        workflows@...r.kernel.org, Git Mailing List <git@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        Eric Wong <e@...24.org>
Subject: Re: email as a bona fide git transport

On 10/18/19 6:15 PM, Theodore Y. Ts'o wrote:
> On Fri, Oct 18, 2019 at 04:27:48PM +0200, Vegard Nossum wrote:
>> commit ac30b08065cd55362a7244a3bbc8df3563cefaaa
>> tree 8f09d9d6ed78f8617b2fe54fe9712990ba808546
>> parent 108b97dc372828f0e72e56bbb40cae8e1e83ece6
>> author Vegard Nossum <vegard.nossum@...cle.com> 1570284959 +0200
>> committer Vegard Nossum <vegard.nossum@...cle.com> 1571408340 +0200
>> gpgsig -----BEGIN PGP SIGNATURE-----
> 	...
> 
> Would it perhaps be possible to put some or all of these headers after
> the patch, as a set of "trailers"?  That would make it easier for
> human readers of the e-mail to get the bits that they most care
> about.... namely, the patch itself.  :-)
> 

Yes, agreed.

I started out using this approach, but I changed it because the
implementation was a bit annoying: 'git am' runs 'git mailsplit',
which just splits the email into two parts:

1) headers, changelog, and diffstat;
2) diff and signature.

One of my PoC patches changes mailsplit to split the extra metadata into
a third file.

The problem I ran into with putting the metadata at the end was
detecting where the diff ends. A comment in 'git apply' suggested that
detecting the difference between "--" as a diff/signature separator and
as part of the diff is nontrivial in the sense that you need to actually
do some parsing and keep track of hunk sizes.

I can try to put it at the end, but maybe the git people have some hints
that would make the implementation easier? Is it okay to reimplement a
simple diff parser in mailsplit?

Thanks,

Vegard