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From: Joel Fernandes <joelaf@google.com>
To: Doug Anderson <dianders@chromium.org>
Cc: Barret Rhoden <brho@google.com>,
	ksummit <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: Fri, 23 Aug 2019 15:08:36 -0400
Message-ID: <CAJWu+or4Lur_q65yTtPQmh8wX2A7EaXaOWXmCnOq3ThRpnN=Tg@mail.gmail.com> (raw)
In-Reply-To: <CAD=FV=UHnf2eCGPo9yH28tFCytWwE-WwsRVjH8oCV5Q+gg8K3g@mail.gmail.com>

On Fri, Aug 23, 2019 at 2:00 PM Doug Anderson <dianders@chromium.org> wrote:
[snip]
> > On Fri, Aug 23, 2019 at 12:45 PM Doug Anderson <dianders@chromium.org> wrote:
> > [snip]
> > > Sure, if a given patch in the series is totally wrong and I re-write
> > > it (but still want the re-write to be considered a new version of the
> > > previous patch) then I have to manually copy the Change-Id for a
> > > gerrit upload.  ...but I'd also be OK if people just get a new
> > > Change-Id in this case.
> >
> > Sometimes it is not "totally wrong" but just "done in a different
> > away" and is a new series. This happens a lot since upstream
> > development can be evolutionary. So your v1 may look nothing like v2
> > and is a whole new series. Yet the history linking the 2 series is
> > important. And no amount of automated commit ID generation can link
> > them. This is the scenario I was talking about. I know the git hook
> > works, but sometimes the Change-Id has to be manually copied. That's
> > not automatable. May be we are slightly on different tracks, but this
> > is the scenario that would be useful to trace IMO.
>
> Agreed that it would be useful and (personally) I'd do it.  Maybe
> others who are used to the gerrit workflow would also do it.  ...but
> what I like is that the fallback for those that don't try to hard
> isn't that terrible.  Yes they'd end up with a new Change-Id in some
> cases, but presumably it still wouldn't be that hard for tools to help
> you.  Namely, if you have a series:
>
> Patch v1 1/3 - Add a frob - Change-Id A
> Patch v1 2/3 - Add a larb - Change-Id B
> Patch v1 3/3 - Use the frob to tweak the larb - Change-Id C
>
> ...and you decide that you should be tweaking a sneech instead of a
> larb, you might end up with this if someone isn't careful to copy
> Change-Ids and their workflow is to throw away the old patch #2 and #3
> instead of amending.
>
> Patch v2 1/3 - Add a frob - Change-Id A
> Patch v2 2/3 - Add a sneech - Change-Id D
> Patch v2 3/3 - Use the frob to tweak the sneech - Change-Id E
>
> So you can't find v1 of patch #2 directly from v2 of patch #2.
> ...but, a good tool could still help you here.  It would see that at
> least one patch in this series had the same Change-Id and it should
> help you find the whole v1 series.
>
> If all 3 patches were all totally new and lost Change IDs then I guess
> you're SOL, but maybe in that case it really should be considered a
> new series anyway?

Maybe it should be. It is hard to generalize it to work all the time.
But I agree with you the above flow is better than nothing.

It does seem people need more convincing here though, that inserting a
unique ID into a commit message is acceptable.

Another thing that could be done is, have the git hook insert the
whatever-ID into the discardable part of the patch. The archive will
then have it even if the commit doesn't. Then something email2git or
patchwork can connect different patches in the archive with a
particular commit. I think Thomas Gleixner or someone else also
proposed something similar in this thread.  What's wrong with that
idea?

thanks,

 - Joel

  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
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 [this message]
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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