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From: Elijah Newren <newren@gmail.com>
To: Derrick Stolee <derrickstolee@github.com>
Cc: Christian Couder <christian.couder@gmail.com>,
	git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>,
	Patrick Steinhardt <ps@pks.im>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	John Cai <johncai86@gmail.com>,
	Christian Couder <chriscool@tuxfamily.org>
Subject: Re: [PATCH 11/14] replay: use standard revision ranges
Date: Mon, 17 Apr 2023 22:54:02 -0700	[thread overview]
Message-ID: <CABPp-BG3xNmwbtu+tstLr8bT24rr0gG65ZvD1rEeus_V8OYk=Q@mail.gmail.com> (raw)
In-Reply-To: <b9732826-5732-0f87-9527-f49c38514fd7@github.com>

On Mon, Apr 17, 2023 at 7:05 AM Derrick Stolee <derrickstolee@github.com> wrote:
>
> On 4/15/2023 3:07 PM, Elijah Newren wrote:
> > On Fri, Apr 14, 2023 at 7:23 AM Derrick Stolee <derrickstolee@github.com> wrote:
>
> >> Sending arbitrary command-line arguments to setup_revisions()
> >> creates an opportunity for behavior you are not expecting.
>
> >> [unstated: and what about other similar options?]
> >
> > I'd really rather not have an allowlist of which revision options
> > should be allowed for use by git-replay.  A denylist might be okay, if
> > also implemented for fast-export, but I'm more of the opinion that we
> > just document that both commands only make sense with "contiguous"
> > history.
> >
> > Most importantly, though, at a minimum I do absolutely want to allow
> > several negative revisions to be specified, several positive revisions
> > to be specified, and special flags like --ancestry-path or
> > --first-parent to be specified.  There may well be additional flags,
> > both current and future, that should be allowed too.
> >
> > In short, I don't want another limited rebase; I want a more generic tool.
>
> The primary value of git-replay (to me) is that we can do "simple" rebases
> without a worktree or user interaction. To me, simple rebases mean apply a
> linear sequence of commits from a single branch onto another branch (and
> specifying an "old base" is simple enough to include here). It also means
> that we abort completely if there is a conflict (and handle conflict
> resolution in later changes).
>
> The sooner we can deliver that, the better we can deliver on its potential
> (and expand its functionality to be more generic).

Limiting the initial scope of this tool to a smaller set of features
is okay (and, in fact, Christian has already done that), but we really
need to avoid painting ourselves into a corner if we change the design
as part of that limiting.  As I stated previously[1], I'm worried this
is happening.

[1] https://lore.kernel.org/git/CABPp-BH7ZPBtV5Hu_-_yVdqVmiydW7_s_LYAtwbPuYSbRQiuQw@mail.gmail.com/,
under "from my view"

> And this is generally my preference, but we shouldn't get functionality
> "by accident"

All of the specific flags and cases you brought up so far were ones I
already carefully considered over a year ago, so the "by accident"
comment seems a little unfair.

> but instead do it with full intention

The intention is listed in the subject of the commit message of this
patch.  I've also explicitly stated my desire on this list to make a
tool which replays based on a general range expression multiple
times[2][3][4][5].  And there are tests for general range expressions
in this series being reviewed.  I don't understand why you might think
I didn't intend to use general range expressions.

[2] https://lore.kernel.org/git/CABPp-BEAqP7maTVw82Qr8mn-sxPzXmHnE_mTKf2pg6hVYAJSUw@mail.gmail.com/
[3] https://lore.kernel.org/git/CABPp-BHmj+QCBFDrH77iNfEU41V=UDu7nhBYkAbCsbXhshJzzw@mail.gmail.com/
[4] https://lore.kernel.org/git/CABPp-BHARfYcsEM7Daeb7+vYxeB9Awo8=qbrOMXG6BQ0gX1RiA@mail.gmail.com/
[5] https://lore.kernel.org/git/CABPp-BEOV53oBoBp4YjiRfksZMmAADanZUUemhxwn7Wor=m-nA@mail.gmail.com/

> and strong testing.

The series as it stands already has some good testing for multiple
divergent branches, which already takes it beyond the simplistic cases
you were focusing on.

Yes, there should obviously be tests for even more cases, and yes I
did leave this series in a work-in-progress state nearly a year ago.
My Git time has been limited, and so I have tended to only work on
things that needed short bursts of attention, like responding to the
list, or the cache.h refactoring...

But I'm kind of at a loss trying to understand this paragraph.  Am I
misinterpreting what you are saying?

> I will always think that certain shortcuts should not be used. This
> includes passing arguments directly to setup_revisions() and using
> pathspec parsing when a path string will work just fine.
>
> If we have a need for a feature, then we should add it explicitly and
> carefully.  The surface area of setup_revisions() is far too large to have
> confidence that we are not exposing bugs for users to trip on later.

My original plan was to just extend rebase rather than create a new
command.  While it'd be an extraordinary amount of work to change
rebase to work without touching the working tree or index, it didn't
look completely insurmountable.  The first thing I found that did look
completely insurmountable was extending it to handle rebasing several
divergent branches possibly sharing some common history.  Since
handling possibly-divergent branches was one of my primary motivating
goals, I'm really rather unwilling to accept the suggestion that we
should strip the tool and copy rebase's broken design, since that
would prevent the tool from ever being extended to do what I want and
what I *already* implemented.  There may be some kind of middle ground
we can find, but the suggestion elsewhere in this thread (to make
git-replay take three commits as positional arguments, with one an
assumed negative ref) is copying that exact inflexible design flaw.

If you want to move git-replay away from setup_revisions(), at a
minimum I think we need a proposal that can be extended to the cases I
highlighted previously:
    * allow specifying several negative revisions (or maybe even zero of them)
    * allow specifying several positive revisions
    * allow standard basic range syntax, i.e. A..B
    * allow --first-parent
    * allow --ancestry-path[=<commit>]
I think it should also be able to eventually support
    * --branches[=<pattern>]
    * --not
    * --tags[=<pattern>]
    * --remotes[=<pattern>]
    * --glob=<pattern>
    * --exclude=<glob-pattern>
    * --all
There may well be others I missed in glancing over the list.

That's a long list of things to parse, which setup_revisions() happens
to handle nicely.  You are right that setup_revisions() also has lots
of options for generating non-contiguous history that may make little
or no sense for replay (and makes no sense for fast-export either).
So, I am willing to consider other solutions if anyone has one, but
only alternative solutions which can eventually handle the above
requirements.  In particular, "three commits as positional arguments"
(with one implicitly being considered a negative ref) conflicts with
the first three bullet points above.

  reply	other threads:[~2023-04-18  5:54 UTC|newest]

Thread overview: 208+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-07  7:24 [PATCH 00/14] Introduce new `git replay` command Christian Couder
2023-04-07  7:24 ` [PATCH 01/14] replay: introduce new builtin Christian Couder
2023-04-07  7:24 ` [PATCH 02/14] replay: start using parse_options API Christian Couder
2023-04-07  7:24 ` [PATCH 03/14] replay: die() instead of failing assert() Christian Couder
2023-04-07  7:24 ` [PATCH 04/14] replay: introduce pick_regular_commit() Christian Couder
2023-04-07  7:24 ` [PATCH 05/14] replay: don't simplify history Christian Couder
2023-04-07  7:24 ` [PATCH 06/14] replay: add an important FIXME comment about gpg signing Christian Couder
2023-04-07  7:24 ` [PATCH 07/14] replay: remove progress and info output Christian Couder
2023-04-07  7:24 ` [PATCH 08/14] replay: remove HEAD related sanity check Christian Couder
2023-04-07  7:24 ` [PATCH 09/14] replay: very coarse worktree updating Christian Couder
2023-04-07  7:24 ` [PATCH 10/14] replay: make it a minimal server side command Christian Couder
2023-04-07  7:24 ` [PATCH 11/14] replay: use standard revision ranges Christian Couder
2023-04-14 14:09   ` Derrick Stolee
2023-04-14 14:23     ` Derrick Stolee
2023-04-15 19:07       ` Elijah Newren
2023-04-16  5:28         ` Elijah Newren
2023-04-17 14:05         ` Derrick Stolee
2023-04-18  5:54           ` Elijah Newren [this message]
2023-04-18 13:10             ` Derrick Stolee
2023-04-20  4:53               ` Elijah Newren
2023-04-20 13:44                 ` Derrick Stolee
2023-04-23  1:18                   ` Elijah Newren
2023-04-24 15:23                     ` Derrick Stolee
2023-04-30  6:45                       ` Elijah Newren
2023-09-03 15:47                         ` Johannes Schindelin
2023-09-07  8:39                           ` Christian Couder
2023-09-07 10:22                             ` Johannes Schindelin
2023-04-17 15:45         ` Junio C Hamano
2023-04-18  5:58           ` Elijah Newren
2023-04-18  4:58       ` Elijah Newren
2023-04-15 18:30     ` Elijah Newren
2023-04-07  7:24 ` [PATCH 12/14] replay: introduce guess_new_base() Christian Couder
2023-04-07  7:24 ` [PATCH 13/14] replay: add different modes Christian Couder
2023-04-07  7:24 ` [PATCH 14/14] replay: stop assuming replayed branches do not diverge Christian Couder
2023-04-14 10:12 ` [PATCH 00/14] Introduce new `git replay` command Phillip Wood
2023-04-15 17:18   ` Elijah Newren
2023-04-14 17:39 ` Felipe Contreras
2023-04-15  6:44 ` Elijah Newren
2023-05-09 17:53 ` [PATCH v2 00/15] " Christian Couder
2023-05-09 17:53   ` [PATCH v2 01/15] t6429: remove switching aspects of fast-rebase Christian Couder
2023-05-09 17:53   ` [PATCH v2 02/15] replay: introduce new builtin Christian Couder
2023-05-09 17:53   ` [PATCH v2 03/15] replay: start using parse_options API Christian Couder
2023-05-09 17:53   ` [PATCH v2 04/15] replay: die() instead of failing assert() Christian Couder
2023-05-09 17:53   ` [PATCH v2 05/15] replay: introduce pick_regular_commit() Christian Couder
2023-05-09 17:53   ` [PATCH v2 06/15] replay: don't simplify history Christian Couder
2023-05-09 17:53   ` [PATCH v2 07/15] replay: add an important FIXME comment about gpg signing Christian Couder
2023-05-09 17:53   ` [PATCH v2 08/15] replay: remove progress and info output Christian Couder
2023-05-09 17:53   ` [PATCH v2 09/15] replay: remove HEAD related sanity check Christian Couder
2023-05-09 17:53   ` [PATCH v2 10/15] replay: make it a minimal server side command Christian Couder
2023-05-09 17:53   ` [PATCH v2 11/15] replay: use standard revision ranges Christian Couder
2023-05-09 17:53   ` [PATCH v2 12/15] replay: disallow revision specific options and pathspecs Christian Couder
2023-05-16  4:25     ` Elijah Newren
2023-05-09 17:53   ` [PATCH v2 13/15] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-05-09 17:53   ` [PATCH v2 14/15] replay: add --contained to rebase contained branches Christian Couder
2023-05-16  4:26     ` Elijah Newren
2023-05-09 17:53   ` [PATCH v2 15/15] replay: stop assuming replayed branches do not diverge Christian Couder
2023-05-16  4:26     ` Elijah Newren
2023-05-09 22:28   ` [PATCH v2 00/15] Introduce new `git replay` command Junio C Hamano
2023-05-10  7:33     ` Christian Couder
2023-05-16  4:42   ` Elijah Newren
2023-06-02 10:25   ` [PATCH v3 " Christian Couder
2023-06-02 10:25     ` [PATCH v3 01/15] t6429: remove switching aspects of fast-rebase Christian Couder
2023-06-02 10:25     ` [PATCH v3 02/15] replay: introduce new builtin Christian Couder
2023-06-02 10:25     ` [PATCH v3 03/15] replay: start using parse_options API Christian Couder
2023-06-02 10:25     ` [PATCH v3 04/15] replay: die() instead of failing assert() Christian Couder
2023-06-02 10:25     ` [PATCH v3 05/15] replay: introduce pick_regular_commit() Christian Couder
2023-06-02 10:25     ` [PATCH v3 06/15] replay: don't simplify history Christian Couder
2023-06-02 10:25     ` [PATCH v3 07/15] replay: add an important FIXME comment about gpg signing Christian Couder
2023-06-02 10:25     ` [PATCH v3 08/15] replay: remove progress and info output Christian Couder
2023-06-02 10:25     ` [PATCH v3 09/15] replay: remove HEAD related sanity check Christian Couder
2023-06-02 10:25     ` [PATCH v3 10/15] replay: make it a minimal server side command Christian Couder
2023-06-22 10:01       ` Toon Claes
2023-09-07  8:32         ` Christian Couder
2023-06-02 10:25     ` [PATCH v3 11/15] replay: use standard revision ranges Christian Couder
2023-06-22 10:03       ` Toon Claes
2023-09-07  8:32         ` Christian Couder
2023-09-07 21:02           ` Dragan Simic
2023-10-10 12:44             ` Christian Couder
2023-10-10 14:02               ` Dragan Simic
2023-06-02 10:25     ` [PATCH v3 12/15] replay: disallow revision specific options and pathspecs Christian Couder
2023-07-25 21:16       ` Junio C Hamano
2023-09-07  8:33         ` Christian Couder
2023-06-02 10:25     ` [PATCH v3 13/15] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-06-22 10:05       ` Toon Claes
2023-09-07  8:35         ` Christian Couder
2023-07-25 21:41       ` Junio C Hamano
2023-09-07  8:35         ` Christian Couder
2023-06-02 10:25     ` [PATCH v3 14/15] replay: add --contained to rebase contained branches Christian Couder
2023-06-22 10:10       ` Toon Claes
2023-09-07  8:37         ` Christian Couder
2023-06-02 10:25     ` [PATCH v3 15/15] replay: stop assuming replayed branches do not diverge Christian Couder
2023-06-03  1:42     ` [PATCH v3 00/15] Introduce new `git replay` command Junio C Hamano
2023-06-05  7:11       ` Christian Couder
2023-09-07  9:25     ` [PATCH v4 " Christian Couder
2023-09-07  9:25       ` [PATCH v4 01/15] t6429: remove switching aspects of fast-rebase Christian Couder
2023-09-07  9:25       ` [PATCH v4 02/15] replay: introduce new builtin Christian Couder
2023-09-07 10:23         ` Johannes Schindelin
2023-10-10 12:42           ` Christian Couder
2023-09-07  9:25       ` [PATCH v4 03/15] replay: start using parse_options API Christian Couder
2023-09-07  9:25       ` [PATCH v4 04/15] replay: die() instead of failing assert() Christian Couder
2023-09-07  9:25       ` [PATCH v4 05/15] replay: introduce pick_regular_commit() Christian Couder
2023-09-07  9:25       ` [PATCH v4 06/15] replay: don't simplify history Christian Couder
2023-09-07 10:23         ` Johannes Schindelin
2023-10-10 12:43           ` Christian Couder
2023-09-07  9:25       ` [PATCH v4 07/15] replay: add an important FIXME comment about gpg signing Christian Couder
2023-09-07  9:25       ` [PATCH v4 08/15] replay: remove progress and info output Christian Couder
2023-09-07  9:25       ` [PATCH v4 09/15] replay: remove HEAD related sanity check Christian Couder
2023-09-07  9:25       ` [PATCH v4 10/15] replay: make it a minimal server side command Christian Couder
2023-09-07  9:25       ` [PATCH v4 11/15] replay: use standard revision ranges Christian Couder
2023-09-07 10:24         ` Johannes Schindelin
2023-10-10 12:49           ` Christian Couder
2023-09-08 22:55         ` Linus Arver
2023-09-10  3:20           ` Linus Arver
2023-10-10 12:48             ` Christian Couder
2023-10-10 12:48           ` Christian Couder
2023-10-19 19:26             ` Linus Arver
2023-09-07  9:25       ` [PATCH v4 12/15] replay: disallow revision specific options and pathspecs Christian Couder
2023-09-07 10:24         ` Johannes Schindelin
2023-10-10 12:49           ` Christian Couder
2023-09-07  9:25       ` [PATCH v4 13/15] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-09-07  9:25       ` [PATCH v4 14/15] replay: add --contained to rebase contained branches Christian Couder
2023-09-07  9:25       ` [PATCH v4 15/15] replay: stop assuming replayed branches do not diverge Christian Couder
2023-09-07 10:25       ` [PATCH v4 00/15] Introduce new `git replay` command Johannes Schindelin
2023-10-10 12:50         ` Christian Couder
2023-10-10 12:38       ` [PATCH v5 00/14] " Christian Couder
2023-10-10 12:38         ` [PATCH v5 01/14] t6429: remove switching aspects of fast-rebase Christian Couder
2023-10-10 12:38         ` [PATCH v5 02/14] replay: introduce new builtin Christian Couder
2023-10-10 12:38         ` [PATCH v5 03/14] replay: start using parse_options API Christian Couder
2023-10-10 12:38         ` [PATCH v5 04/14] replay: die() instead of failing assert() Christian Couder
2023-10-10 12:38         ` [PATCH v5 05/14] replay: introduce pick_regular_commit() Christian Couder
2023-10-10 12:38         ` [PATCH v5 06/14] replay: change rev walking options Christian Couder
2023-10-10 12:38         ` [PATCH v5 07/14] replay: add an important FIXME comment about gpg signing Christian Couder
2023-10-10 12:38         ` [PATCH v5 08/14] replay: remove progress and info output Christian Couder
2023-10-10 12:38         ` [PATCH v5 09/14] replay: remove HEAD related sanity check Christian Couder
2023-10-10 12:38         ` [PATCH v5 10/14] replay: make it a minimal server side command Christian Couder
2023-10-10 12:38         ` [PATCH v5 11/14] replay: use standard revision ranges Christian Couder
2023-10-19 19:49           ` Linus Arver
2023-10-10 12:38         ` [PATCH v5 12/14] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-10-10 12:38         ` [PATCH v5 13/14] replay: add --contained to rebase contained branches Christian Couder
2023-10-10 12:38         ` [PATCH v5 14/14] replay: stop assuming replayed branches do not diverge Christian Couder
2023-10-26 13:44         ` [PATCH v5 00/14] Introduce new `git replay` command Johannes Schindelin
2023-10-29  6:01           ` Elijah Newren
2023-11-02 14:59             ` Christian Couder
2023-11-08 12:25               ` Johannes Schindelin
2023-11-02 15:06           ` Christian Couder
2023-11-08 12:25             ` Johannes Schindelin
2023-10-29  6:00         ` Elijah Newren
2023-10-29 14:14           ` Johannes Schindelin
2023-10-30 17:18             ` Elijah Newren
2023-11-02 14:44               ` Christian Couder
2023-11-02 14:48           ` Christian Couder
2023-11-02 13:51         ` [PATCH v6 " Christian Couder
2023-11-02 13:51           ` [PATCH v6 01/14] t6429: remove switching aspects of fast-rebase Christian Couder
2023-11-02 13:51           ` [PATCH v6 02/14] replay: introduce new builtin Christian Couder
2023-11-02 13:51           ` [PATCH v6 03/14] replay: start using parse_options API Christian Couder
2023-11-02 13:51           ` [PATCH v6 04/14] replay: die() instead of failing assert() Christian Couder
2023-11-02 13:51           ` [PATCH v6 05/14] replay: introduce pick_regular_commit() Christian Couder
2023-11-02 13:51           ` [PATCH v6 06/14] replay: change rev walking options Christian Couder
2023-11-02 13:51           ` [PATCH v6 07/14] replay: add an important FIXME comment about gpg signing Christian Couder
2023-11-02 13:51           ` [PATCH v6 08/14] replay: remove progress and info output Christian Couder
2023-11-02 13:51           ` [PATCH v6 09/14] replay: remove HEAD related sanity check Christian Couder
2023-11-02 13:51           ` [PATCH v6 10/14] replay: make it a minimal server side command Christian Couder
2023-11-02 13:51           ` [PATCH v6 11/14] replay: use standard revision ranges Christian Couder
2023-11-02 13:51           ` [PATCH v6 12/14] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-11-02 13:51           ` [PATCH v6 13/14] replay: add --contained to rebase contained branches Christian Couder
2023-11-02 13:51           ` [PATCH v6 14/14] replay: stop assuming replayed branches do not diverge Christian Couder
2023-11-07  2:43           ` [PATCH v6 00/14] Introduce new `git replay` command Elijah Newren
2023-11-07  9:43             ` Christian Couder
2023-11-15 14:51               ` Christian Couder
2023-11-08 12:19             ` Johannes Schindelin
2023-11-08 12:47           ` Johannes Schindelin
2023-11-15 14:46             ` Christian Couder
2023-11-16  8:45               ` Johannes Schindelin
2023-11-16  8:52                 ` Christian Couder
2023-11-15 14:33           ` [PATCH v7 " Christian Couder
2023-11-15 14:33             ` [PATCH v7 01/14] t6429: remove switching aspects of fast-rebase Christian Couder
2023-11-15 14:33             ` [PATCH v7 02/14] replay: introduce new builtin Christian Couder
2023-11-15 14:33             ` [PATCH v7 03/14] replay: start using parse_options API Christian Couder
2023-11-15 14:33             ` [PATCH v7 04/14] replay: die() instead of failing assert() Christian Couder
2023-11-15 14:33             ` [PATCH v7 05/14] replay: introduce pick_regular_commit() Christian Couder
2023-11-15 14:33             ` [PATCH v7 06/14] replay: change rev walking options Christian Couder
2023-11-15 14:33             ` [PATCH v7 07/14] replay: add an important FIXME comment about gpg signing Christian Couder
2023-11-15 14:33             ` [PATCH v7 08/14] replay: remove progress and info output Christian Couder
2023-11-15 14:33             ` [PATCH v7 09/14] replay: remove HEAD related sanity check Christian Couder
2023-11-15 14:33             ` [PATCH v7 10/14] replay: make it a minimal server side command Christian Couder
2023-11-15 14:33             ` [PATCH v7 11/14] replay: use standard revision ranges Christian Couder
2023-11-15 14:33             ` [PATCH v7 12/14] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-11-15 14:33             ` [PATCH v7 13/14] replay: add --contained to rebase contained branches Christian Couder
2023-11-15 14:33             ` [PATCH v7 14/14] replay: stop assuming replayed branches do not diverge Christian Couder
2023-11-16  8:53             ` [PATCH v7 00/14] Introduce new `git replay` command Johannes Schindelin
2023-11-23 19:32               ` Elijah Newren
2023-11-24  0:28                 ` Junio C Hamano
2023-11-24 11:10             ` [PATCH v8 " Christian Couder
2023-11-24 11:10               ` [PATCH v8 01/14] t6429: remove switching aspects of fast-rebase Christian Couder
2023-11-24 11:10               ` [PATCH v8 02/14] replay: introduce new builtin Christian Couder
2023-11-24 11:10               ` [PATCH v8 03/14] replay: start using parse_options API Christian Couder
2023-11-24 11:10               ` [PATCH v8 04/14] replay: die() instead of failing assert() Christian Couder
2023-11-24 11:10               ` [PATCH v8 05/14] replay: introduce pick_regular_commit() Christian Couder
2023-11-24 11:10               ` [PATCH v8 06/14] replay: change rev walking options Christian Couder
2023-11-24 11:10               ` [PATCH v8 07/14] replay: add an important FIXME comment about gpg signing Christian Couder
2023-11-24 11:10               ` [PATCH v8 08/14] replay: remove progress and info output Christian Couder
2023-11-24 11:10               ` [PATCH v8 09/14] replay: remove HEAD related sanity check Christian Couder
2023-11-24 11:10               ` [PATCH v8 10/14] replay: make it a minimal server side command Christian Couder
2023-11-24 11:10               ` [PATCH v8 11/14] replay: use standard revision ranges Christian Couder
2023-11-24 11:10               ` [PATCH v8 12/14] replay: add --advance or 'cherry-pick' mode Christian Couder
2023-11-24 11:10               ` [PATCH v8 13/14] replay: add --contained to rebase contained branches Christian Couder
2023-11-24 11:10               ` [PATCH v8 14/14] replay: stop assuming replayed branches do not diverge Christian Couder
2023-11-25  0:02               ` [PATCH v8 00/14] Introduce new `git replay` command Johannes Schindelin

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