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From: Brendan Higgins <brendanhiggins@google.com>
To: Doug Anderson <dianders@chromium.org>
Cc: Joel Fernandes <joelaf@google.com>,
	Barret Rhoden <brho@google.com>,
	ksummit-discuss@lists.linuxfoundation.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jonathan Nieder <jrn@google.com>,
	Tomasz Figa <tfiga@chromium.org>,
	Han-Wen Nienhuys <hanwen@google.com>,
	Theodore Tso <tytso@google.com>,
	David Rientjes <rientjes@google.com>,
	Dmitry Torokhov <dtor@chromium.org>,
	Dmitry Vyukov <dvyukov@google.com>
Subject: Re: [Ksummit-discuss] Allowing something Change-Id (or something like it) in kernel commits
Date: Thu, 22 Aug 2019 17:03:39 -0700
Message-ID: <CAFd5g46G6KvLU7+mkCB1mULPG2x=X5TfUmjmm0_mahpgEZ_9JA@mail.gmail.com> (raw)
In-Reply-To: <CAD=FV=UPjPpUyFTPjF-Ogzj_6LJLE4PTxMhCoCEDmH1LXSSmpQ@mail.gmail.com>

On Thu, Aug 22, 2019 at 4:40 PM Doug Anderson <dianders@chromium.org> wrote:
[...]
> Specifically, let me list the problems I'd like to solve:
>
> 1. If I see a commit in Linux, I would like to be able to easily find
> all of the mailing list discussions relevant to that commit.  I know
> there are proposals about including the Message-Id of the final post
> in the commit log and that is certainly better than nothing, but the
> Message-Id will only get you a link to the final version of the patch.
> If the relevant discussion happened on a previous version of that
> patch then you need to find it yourself.  This gets harder if the
> patch changed subject, touched different files, if parts of the series
> landed at different times, and if multiple people were involved in
> posting different versions of the patch.  If the commit in Linux has a
> Change-Id then the old versions are logically linked and easier to
> associated with one another.

Please correct me if I am wrong, but I believe this feature already
exists in cregit[1]. I believe this is called Email2git[2].

To be clear, I am not against the Change-Id tag, but I think we
already have support for what you are describing here.

> 2. If I do a search through old mailing list archives and I stumble
> upon a patch that didn't land, I can more easily find different
> versions of that patch if I have a Change-Id.  Some of these different
> versions may have relevant discussions that explains why the patch
> didn't land.  Finding these other patches without a Change-Id might be
> hard, again because they may touch different files, have a different
> subject, or have been posted by a different person.

Yes! I would love this, and I don't think Email2git handles this;
nevertheless, I am not sure how difficult it would be to add support
for that to Email2git.

>
> At the moment using a Change-Id in the way I described would require
> searching through mailing lists for the Change-Id string to find other
> versions of the same patch.  However, I would expect it would only be
> a matter of time before tools like patchwork are able to use Change-Id
> to associate one version of a patch with the next version.  I would
> also expect that allowing Change-Id to exist would allow someone to
> (perhaps) create a gerrit instance that watched the kernel mailing
> list and mirrored mailing list discussions in the GUI.  In other
> words, once such tools exist presumably Change-Id will be much more
> useful: you will eventually be able to paste a Change-Id into a tool
> and get links to all relevant discussion and related posts.
>
>
> The basic summary is that I'd like there to be some way to track a
> logical patch over its lifetime.  I don't believe there is a reliable
> (non-heuristic) way to do this today and I think Change-Id provides a

I am not sure what Email2git does (I assume it uses a heuristic), but
it seems reasonably reliable after a couple of random spot checks.

> nice solution.  While we could come up with a new and different
> solution (because Change-Id was not invented here), it feels like
> adopting Change-Id is convenient and easy and provides a true benefit.
> Change-Id works super well with the decentralized/email workflow for
> patches and can be phased in over time (or it can stay optional
> forever).

I have wanted to do some of this tracking a commit across multiple
revisions and I have not found a simple way to do it. I keep meaning
to look into Email2git more closely, but it is hard for me to imagine
something more straightforward than something analogous to a
Change-Id.

So I like the idea, but I think it is probably worth first
investigating Email2git and see if it solves the same use case. If
Email2git is portable and is easy to build into a workflow outside of
cregit, then it should be equally easy to represent the metadata that
Change-Id provides outside of the mailing lists.

Thanks for thinking about this!

[1] https://cregit.linuxsources.org
[2] https://www.linux.com/tutorials/email2git-matching-linux-code-its-mailing-list-discussions/

  reply index

Thread overview: 105+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-22 23:39 Doug Anderson
2019-08-23  0:03 ` Brendan Higgins [this message]
2019-08-23  0:17 ` Linus Torvalds
2019-08-23  0:30   ` Olof Johansson
2019-08-23  0:43     ` Guenter Roeck
2019-08-23  0:45       ` Olof Johansson
2019-08-23  1:05         ` Olof Johansson
2019-08-23  1:09           ` Dmitry Torokhov
2019-08-23  1:36         ` Theodore Y. Ts'o
2019-08-23  2:58           ` Linus Torvalds
2019-08-23  3:03             ` Linus Torvalds
2019-08-23 13:15               ` Sean Paul
2019-08-23 15:18                 ` Theodore Y. Ts'o
2019-08-23 15:31                   ` Sean Paul
2019-08-23 15:48                     ` Thomas Gleixner
2019-08-23 16:19                       ` Dmitry Torokhov
2019-08-23 16:35                         ` Joel Fernandes
2019-08-23 16:45                           ` Doug Anderson
2019-08-23 16:54                             ` Joel Fernandes
2019-08-23 18:00                               ` Doug Anderson
2019-08-23 19:08                                 ` Joel Fernandes
2019-08-23 19:15                                   ` Joel Fernandes
2019-08-23 19:23                                     ` Thomas Gleixner
2019-08-23 19:31                                       ` Joel Fernandes
2019-08-24 16:53                                   ` Doug Anderson
2019-08-23 16:46                           ` Dmitry Torokhov
2019-08-23 19:17                             ` Thomas Gleixner
2019-08-23 19:38                               ` Laurent Pinchart
2019-08-23 21:15                                 ` Thomas Gleixner
2019-08-23 21:25                                   ` Mark Brown
2019-08-24 23:13                                   ` Theodore Y. Ts'o
2019-08-25  7:09                                     ` Thomas Gleixner
2019-08-26 22:05                                       ` Thomas Gleixner
2019-08-28  8:50                                         ` Thomas Gleixner
2019-08-23 20:02                               ` Christian Brauner
2019-08-24 16:34                                 ` Doug Anderson
2019-08-24 18:11                                   ` Linus Torvalds
2019-08-24 23:04                                     ` Theodore Y. Ts'o
2019-08-25  3:11                                       ` Greg Kroah-Hartman
2019-08-27 10:51                                         ` Mark Brown
2019-09-09  8:14                                           ` Michael Ellerman
2019-09-09 12:09                                             ` Mark Brown
2019-08-26 17:13                                     ` Doug Anderson
2019-08-26 17:30                                       ` Joel Fernandes
2019-08-26 21:35                                         ` Doug Anderson
2019-08-26 21:51                                           ` Thomas Gleixner
2019-08-26 22:06                                             ` Doug Anderson
2019-08-26 22:19                                               ` Thomas Gleixner
2019-08-26 23:02                                           ` Theodore Y. Ts'o
2019-08-26 23:11                                             ` Doug Anderson
2019-09-16 14:11                                               ` Christian Brauner
2019-09-16 17:43                                               ` Al Viro
2019-09-16 18:05                                                 ` Doug Anderson
2019-08-26 23:43                                             ` Thomas Gleixner
2019-08-28 12:34                                               ` Christian Brauner
2019-08-27  0:29                                             ` Dmitry Vyukov
2019-08-27  6:06                                               ` Thomas Gleixner
2019-08-27 13:24                                                 ` Dmitry Vyukov
2019-08-27 13:48                                                   ` Greg Kroah-Hartman
2019-08-27 14:01                                                     ` Guenter Roeck
2019-08-27 14:09                                                       ` Thomas Gleixner
2019-08-27 15:33                                                         ` Greg Kroah-Hartman
2019-08-27 15:42                                                           ` Thomas Gleixner
2019-08-27 18:55                                                           ` Konstantin Ryabitsev
2019-08-27 19:53                                                             ` Greg Kroah-Hartman
2019-08-27 21:34                                                               ` Joel Fernandes
2019-08-27 21:38                                                                 ` Joel Fernandes
2019-08-28  9:08                                                                 ` Greg Kroah-Hartman
2019-08-28  9:25                                                                   ` Jani Nikula
2019-08-28 10:04                                                                   ` Martin K. Petersen
2019-08-28 10:53                                                                     ` Thomas Gleixner
2019-08-28 12:46                                                                       ` Martin K. Petersen
2019-08-28 10:42                                                                   ` Mark Brown
2019-08-28 11:41                                                                     ` Greg Kroah-Hartman
2019-08-28 12:22                                                                   ` Christian Brauner
2019-08-28 12:38                                                                   ` Joel Fernandes
2019-08-28 13:58                                                                     ` Theodore Y. Ts'o
2019-08-28 20:39                                                                       ` Doug Anderson
2019-08-28 20:46                                                                         ` Johannes Berg
2019-08-28 21:00                                                                           ` Doug Anderson
2019-08-28 22:15                                                                         ` Rob Herring
2019-08-27 17:34                                                       ` Geert Uytterhoeven
2019-08-27 18:50                                                         ` Guenter Roeck
2019-08-27 14:06                                                   ` Thomas Gleixner
2019-08-27  7:33                                               ` Geert Uytterhoeven
2019-08-27 13:30                                                 ` Dmitry Vyukov
2019-08-27 14:28                                                   ` Paul E. McKenney
2019-08-27 15:06                                                     ` Thomas Gleixner
2019-08-27 15:25                                                       ` Paul E. McKenney
2019-08-28  8:57                                                         ` Dan Carpenter
2019-08-23 15:49                     ` Doug Anderson
2019-08-23 15:54                       ` Thomas Gleixner
2019-08-23 15:59                         ` Thomas Gleixner
2019-08-23 16:38                           ` Doug Anderson
2019-08-23 16:50                             ` Andrew Lunn
2019-08-23 17:50                               ` Doug Anderson
2019-08-23 18:10               ` Konstantin Ryabitsev
2019-08-26 22:19               ` Paul Mackerras
2019-08-27  7:02                 ` Stephen Rothwell
2019-08-23  9:09             ` Vlastimil Babka
2019-08-23 12:48               ` Bhaskar Chowdhury
2019-08-23  1:01   ` Dmitry Torokhov
2019-08-23  1:07   ` Doug Anderson
2019-08-23  1:18     ` Joel Fernandes
2019-09-05  8:12 ` Eric Wong

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