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From: Alex Henrie <alexhenrie24@gmail.com>
To: Glen Choo <chooglen@google.com>
Cc: git@vger.kernel.org, tao@klerks.biz, gitster@pobox.com,
	newren@gmail.com, phillip.wood123@gmail.com,
	Johannes.Schindelin@gmx.de, sorganov@gmail.com,
	calvinwan@google.com, jonathantanmy@google.com
Subject: Re: [PATCH v6 3/3] rebase: add a config option for --rebase-merges
Date: Thu, 16 Mar 2023 14:27:21 -0600	[thread overview]
Message-ID: <CAMMLpeR4x0_u=JGnWQ1xvBeVBXBw7VAgLTWgvHdMFDZLrcy1pA@mail.gmail.com> (raw)
In-Reply-To: <kl6lzg8cvby2.fsf@chooglen-macbookpro.roam.corp.google.com>

On Thu, Mar 16, 2023 at 11:32 AM Glen Choo <chooglen@google.com> wrote:
>
> Alex Henrie <alexhenrie24@gmail.com> writes:
>
> >> > In the future, the default rebase-merges mode may change from
> >> > no-rebase-cousins to rebase-cousins.
> >>
> >> I suspect a more likely future would be that the default is to rebase
> >> 'evil' merges instead of trying to recreate merge commits, but of
> >> course, the important thing is that we promote the default, not what the
> >> default will be...
> >
> > Glen, do you have any more thoughts? At this point, the only thing
> > that's keeping me from implementing Phillip's request to make
> > --rebase-merges without an argument clobber rebase.rebaseMerges is
> > your suspicion that we might need to change the default rebase-merges
> > mode in the future, and I assume that we would want to use the
> > rebase.rebaseMerges config option to facilitate the transition.
>
> (Sorry for the late reply)
>
> Ah, I don't really have more thoughts on the matter. I am fairly
> confident that we would _like_ to change the default to rebase 'evil'
> merges, but I don't know how likely that will be.
>
> Perhaps it would help to enumerate the rules to see if it is too
> confusing or not?
>
> The behaviors we can tweak are:
>
> - Whether to rebase merges or not (true, false, specified mode, or
>   default)
> - What mode to use when rebasing merges (specified mode or default)
>
> And the sources are either CLI or config, with CLI always overriding
> config.
>
> Should we rebase a merge?
>
> - If neither CLI or config tells us whether or not to rebase a merge,
>   default to "don't rebase merges".
> - If one of CLI or config tells us whether or not to rebase a merge,
>   respect it.
> - If both CLI or config tell us whether or not to rebase a merge,
>   respect CLI and ignore config.
>
> What mode should we use?
>
> - If neither CLI or config tells us what mode to use, default to
>   "no-rebase-cousins" (or whatever default we decide).
> - If one of CLI or config tells us what mode to use, respect it.
> - If both CLI or config tell us what mode to use, respect CLI and ignore
>   config.
>
> If users cleanly separate the two concepts, I think it is quite clear.
> (I'm not advocating for this approach, but) e.g. if we pretend that each
> behavior were configured separately, like:
>
> --[no-]rebase-merges [--rebase-merges-mode=(rebase-cousins|no-rebase-cousins)]
>
> I don't think there would be any confusion. (Having --rebase-merges-mode
> be a no-op without --rebase-merges is probably even more confusing to
> users, plus this would break backwards compatibility, so I don't think
> this is a good idea at all.)
>
> Your doc patch explains the rules pretty clearly, but perhaps it doesn't
> explain this mental model clearly enough, hence the confusion. If we
> don't find a good way to communicate this (I think it is clear, but
> other reviewers seem yet unconvinced), I wouldn't mind taking Phillip's
> suggestion to have "--rebase-merges" override
> "rebase.rebaseMerges='specific-mode'".

I got the impression that everyone, including Phillip,[1] already
agrees that the proposed documentation is clear about the interaction
between the config option and the command line option. However, it is
a little weird when you consider that other flags with optional
arguments, like `git branch --track`, unconditionally override their
corresponding config options.[2]

Let me ask a different but related question: If we add a
rebase-evil-merges mode, do you think that would be orthogonal to the
rebase-cousins mode?

-Alex

[1] https://lore.kernel.org/git/7cf19017-518b-245e-aea2-5dee55f88276@dunelm.org.uk/
[2] https://lore.kernel.org/git/5551d67b-3021-8cfc-53b5-318f223ded6d@dunelm.org.uk/

  parent reply	other threads:[~2023-03-16 20:28 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-23  5:34 [PATCH v4 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-02-23  5:34 ` [PATCH v4 2/3] rebase: stop accepting --rebase-merges="" Alex Henrie
2023-02-24 13:54   ` Johannes Schindelin
2023-02-24 17:20     ` Junio C Hamano
2023-02-24 17:50       ` Alex Henrie
2023-02-24 18:08         ` Junio C Hamano
2023-02-24 18:23           ` Alex Henrie
2023-02-24 18:40             ` Junio C Hamano
2023-02-24 18:55               ` Alex Henrie
2023-02-24 19:13                 ` Junio C Hamano
2023-02-24 19:24                   ` Alex Henrie
2023-02-24 19:24                   ` Phillip Wood
2023-02-24 19:56                     ` Alex Henrie
2023-02-23  5:34 ` [PATCH v4 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-02-24 13:53   ` Johannes Schindelin
2023-02-24 17:49     ` Alex Henrie
2023-02-24 14:55   ` Phillip Wood
2023-02-24 17:51     ` Alex Henrie
2023-02-23 17:28 ` [PATCH v4 1/3] rebase: add documentation and test for --no-rebase-merges Junio C Hamano
2023-02-24 13:57   ` Johannes Schindelin
2023-02-24 19:16     ` Junio C Hamano
2023-02-25 18:09     ` Alex Henrie
2023-02-25 18:03 ` [PATCH v5 0/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-02-25 18:03   ` [PATCH v5 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-03-01 23:23     ` Glen Choo
2023-02-25 18:03   ` [PATCH v5 2/3] rebase: deprecate --rebase-merges="" Alex Henrie
2023-03-01 23:46     ` Glen Choo
2023-03-02 10:07     ` Phillip Wood
2023-03-02 18:02     ` Calvin Wan
2023-02-25 18:03   ` [PATCH v5 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-03-01 23:43     ` Glen Choo
2023-03-02  9:37     ` Phillip Wood
2023-03-04 23:24       ` Alex Henrie
2023-03-07 16:23         ` Phillip Wood
2023-03-12 20:57           ` Alex Henrie
2023-03-13 14:20             ` Phillip Wood
2023-03-13 16:12               ` Felipe Contreras
2023-03-13 19:46             ` Junio C Hamano
2023-03-24 14:47             ` About replaying "evil" merges... " Johannes Schindelin
2023-03-02 18:02     ` Calvin Wan
2023-03-04 23:24       ` Alex Henrie
2023-03-01 23:14   ` [PATCH v5 0/3] " Glen Choo
2023-03-02  5:02     ` Alex Henrie
2023-03-02  5:09       ` Alex Henrie
2023-03-05  5:07   ` [PATCH v6 0/3] rebase: document, clean up, and introduce " Alex Henrie
2023-03-05  5:07     ` [PATCH v6 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-03-08 22:25       ` Sergey Organov
2023-03-05  5:07     ` [PATCH v6 2/3] rebase: deprecate --rebase-merges="" Alex Henrie
2023-03-07 14:59       ` Phillip Wood
2023-03-05  5:07     ` [PATCH v6 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-03-07 14:56       ` Phillip Wood
2023-03-07 18:32         ` Junio C Hamano
2023-03-12 21:01           ` Alex Henrie
2023-03-08  0:09         ` Glen Choo
2023-03-08  0:02       ` Glen Choo
2023-03-12 21:03         ` Alex Henrie
2023-03-15  2:52         ` Alex Henrie
2023-03-16 17:32           ` Glen Choo
2023-03-16 18:11             ` Felipe Contreras
2023-03-16 22:46               ` Glen Choo
2023-03-16 23:48                 ` Felipe Contreras
2023-03-16 20:27             ` Alex Henrie [this message]
2023-03-16 22:39               ` Glen Choo
2023-03-18  5:59                 ` Alex Henrie
2023-03-24 15:05               ` Johannes Schindelin
2023-03-25 16:59               ` Sergey Organov
2023-03-05 12:22     ` [PATCH v6 0/3] rebase: document, clean up, and introduce " Sergey Organov
2023-03-05 21:33       ` Alex Henrie
2023-03-05 22:54         ` Sergey Organov
2023-03-06  0:02           ` Alex Henrie
2023-03-06 13:23             ` Sergey Organov
2023-03-06 19:08             ` Junio C Hamano
2023-03-06 17:19           ` Junio C Hamano
2023-03-06 16:24     ` Phillip Wood
2023-03-06 17:36       ` Alex Henrie
2023-03-07 15:07         ` Phillip Wood
2023-03-08  0:13     ` Glen Choo
2023-03-12 21:04     ` [PATCH v7 " Alex Henrie
2023-03-12 21:04       ` [PATCH v7 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-03-12 21:04       ` [PATCH v7 2/3] rebase: deprecate --rebase-merges="" Alex Henrie
2023-03-12 21:04       ` [PATCH v7 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-03-20  5:59       ` [PATCH v8 0/3] rebase: document, clean up, and introduce " Alex Henrie
2023-03-20  5:59         ` [PATCH v8 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-03-20  5:59         ` [PATCH v8 2/3] rebase: deprecate --rebase-merges="" Alex Henrie
2023-03-20  5:59         ` [PATCH v8 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-03-22 16:54           ` Phillip Wood
2023-03-23 18:45             ` Junio C Hamano
2023-03-24 14:52               ` Phillip Wood
2023-03-25  5:23               ` Alex Henrie
2023-03-25  5:21             ` Alex Henrie
2023-03-26  3:06         ` [PATCH v9 0/3] rebase: document, clean up, and introduce " Alex Henrie
2023-03-26  3:06           ` [PATCH v9 1/3] rebase: add documentation and test for --no-rebase-merges Alex Henrie
2023-03-26  3:06           ` [PATCH v9 2/3] rebase: deprecate --rebase-merges="" Alex Henrie
2023-03-26  3:06           ` [PATCH v9 3/3] rebase: add a config option for --rebase-merges Alex Henrie
2023-03-26 15:12           ` [PATCH v9 0/3] rebase: document, clean up, and introduce " Phillip Wood
2023-03-27 16:33             ` Junio C Hamano

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