From: Siddharth Asthana <siddharthasthana31@gmail•com>
To: Elijah Newren <newren@gmail•com>
Cc: Junio C Hamano <gitster@pobox•com>,
Johannes Schindelin <Johannes.Schindelin@gmx•de>,
git@vger•kernel.org, christian.couder@gmail•com, ps@pks•im,
phillip.wood123@gmail•com, phillip.wood@dunelm•org.uk,
karthik.188@gmail•com, code@khaugsbakk•name, rybak.a.v@gmail•com,
jltobler@gmail•com, toon@iotcl•com, johncai86@gmail•com
Subject: Re: [PATCH 0/1] replay: add --revert option to reverse commit changes
Date: Fri, 28 Nov 2025 13:54:07 +0530 [thread overview]
Message-ID: <c930d6df-5dc4-401f-a9a1-eb2f00b2e837@gmail.com> (raw)
In-Reply-To: <CABPp-BFsDJVtR6RV8KugCW2vmbD1=rTOKLp2jeawRfuPUEsNEA@mail.gmail.com>
On 28/11/25 13:37, Elijah Newren wrote:
> On Thu, Nov 27, 2025 at 11:21 AM Siddharth Asthana
> <siddharthasthana31@gmail•com> wrote:
>> On 27/11/25 02:34, Junio C Hamano wrote:
>>> Siddharth Asthana <siddharthasthana31@gmail•com> writes:
>>>
>>>> 1. For quick undoing an entire MR, the `merge-tree` approach you
>>>> suggest is indeed more efficient and avoids unnecessary intermediate
>>>> conflicts.
>>>>
>>>> 2. For commit-by-commit reverts, we need individual revert commits with
>>>> proper attribution (which commit is being reverted) for auditability and
>>>> history clarity. This is particularly useful when only specific commits
>>>> from a merged branch need to be reverted.
>>> These are both good workflows with appropriate uses. To make the
>>> tool useful for #2, it needs to be able to allow "I have merged a
>>> topic with 7 commits, but the first commit and the fourth commit are
>>> faulty and I need to revert them", i.e., not just a range
>>
>> Since replay uses the same rev-list machinery as `git log`, users can
>> already specify disconnected commits:
>>
>> git replay --revert <target> <commit1> <commit4>
Hi Elijah,
> No, this command does not specify disconnected commits. A <range> of
> "<commit1> <commit4>" specifies all commits in the history of either
> <commit1> or <commit4>.
You are right, I misspoke. I was conflating the command-line syntax with
what the revision machinery actually produces after prepare_revision_walk().
> Thus, this example command line would be
> asking to revert all commits in the history of either <commit1> or
> <commit4> (all the way back to the initial commit), rather than just
> reverting those two commits. This is just like how
> git log <commit1> <commit4>
> shows all commits in the history of either <commit1> or <commit4>
> instead of just showing those two commits.
>
> There isn't really a mechanism in replay right now to handle a
> disconnected set of commits for either --advance or --revert.
Right, the check at line 190 in replay.c:
if (rinfo.positive_refexprs > 1)
die(_("cannot advance target with multiple sources..."));
fires before we even get to the revision walk.
> If there were, it'd probably look like
>
> git replay --advance <branch> --no-walk <commit1> <commit4>
>
> but the code isn't set up to check whether you specified --no-walk,
> and thinks "Um, you specified multiple branches here and it's not
> clear the order in which to cherry-pick them" so it throws an error:
>
> $ git replay --advance main --no-walk Commit1 Commit7
> fatal: cannot advance target with multiple sources because ordering
> would be ill-defined
>
> If you comment out the relevant check which dies with that error, then
> you end up in some codepath that segfaults instead (not-properly
> initialized commit/tree objects or something?). I'm sure that could
> be fixed, but "users can already specify disconnected commits" is just
> not accurate.
>
>> I will add a test to verify this works and document the capability.
> Supporting --no-walk so that folks can do disconnected commits for
> both --advance and --revert may be nice, but given that it's missing
> for --advance already, it might be considered a separate change from
> your current submission. I'll leave that up to you.
Agreed. I will keep the current submission focused on basic --revert
functionality. Supporting --no-walk for disconnected commits (benefiting
both --advance and --revert) would make a nice follow-up series.
Thanks for the correction.
Siddharth
next prev parent reply other threads:[~2025-11-28 8:24 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-25 17:00 [PATCH 0/1] replay: add --revert option to reverse commit changes Siddharth Asthana
2025-11-25 17:00 ` [PATCH 1/1] " Siddharth Asthana
2025-11-25 19:22 ` Junio C Hamano
2025-11-25 19:30 ` Junio C Hamano
2025-11-25 19:39 ` Junio C Hamano
2025-11-25 20:06 ` Junio C Hamano
2025-11-26 19:31 ` Siddharth Asthana
2025-11-26 19:28 ` Siddharth Asthana
2025-11-26 19:26 ` Siddharth Asthana
2025-11-26 21:13 ` Junio C Hamano
2025-11-27 19:23 ` Siddharth Asthana
2025-11-26 11:10 ` Phillip Wood
2025-11-26 17:35 ` Elijah Newren
2025-11-26 18:41 ` Junio C Hamano
2025-11-26 21:17 ` Junio C Hamano
2025-11-26 23:06 ` Elijah Newren
2025-11-26 23:14 ` Junio C Hamano
2025-11-26 23:57 ` Elijah Newren
2025-11-26 19:50 ` Siddharth Asthana
2025-11-26 19:39 ` Siddharth Asthana
2025-11-27 16:21 ` Phillip Wood
2025-11-27 19:24 ` Siddharth Asthana
2025-11-25 17:25 ` [PATCH 0/1] " Johannes Schindelin
2025-11-25 18:02 ` Junio C Hamano
2025-11-26 19:18 ` Siddharth Asthana
2025-11-26 21:04 ` Junio C Hamano
2025-11-27 19:21 ` Siddharth Asthana
2025-11-27 20:17 ` Junio C Hamano
2025-11-28 8:07 ` Elijah Newren
2025-11-28 8:24 ` Siddharth Asthana [this message]
2025-11-28 16:35 ` Junio C Hamano
2025-11-28 17:07 ` Elijah Newren
2025-11-28 20:50 ` Junio C Hamano
2025-11-28 22:03 ` Elijah Newren
2025-11-29 5:59 ` Junio C Hamano
2025-12-02 20:16 ` [PATCH v2 0/2] replay: add --revert mode " Siddharth Asthana
2025-12-02 20:16 ` [PATCH v2 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2025-12-05 11:33 ` Patrick Steinhardt
2025-12-07 23:00 ` Siddharth Asthana
2025-12-08 7:07 ` Patrick Steinhardt
2026-02-11 13:03 ` Toon Claes
2026-02-11 13:40 ` Patrick Steinhardt
2026-02-11 15:23 ` Kristoffer Haugsbakk
2026-02-11 17:41 ` Junio C Hamano
2026-02-18 22:53 ` Siddharth Asthana
2025-12-02 20:16 ` [PATCH v2 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
2025-12-05 11:33 ` Patrick Steinhardt
2025-12-07 23:03 ` Siddharth Asthana
2025-12-16 16:23 ` Phillip Wood
2026-02-18 23:42 ` [PATCH v3 0/2] " Siddharth Asthana
2026-02-18 23:42 ` [PATCH v3 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2026-02-20 17:01 ` Toon Claes
2026-02-25 21:53 ` Junio C Hamano
2026-03-06 4:55 ` Siddharth Asthana
2026-03-06 4:31 ` Siddharth Asthana
2026-02-26 14:27 ` Phillip Wood
2026-03-06 5:00 ` Siddharth Asthana
2026-02-18 23:42 ` [PATCH v3 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
2026-02-20 17:35 ` Toon Claes
2026-02-20 20:23 ` Junio C Hamano
2026-02-23 9:13 ` Christian Couder
2026-02-23 11:23 ` Toon Claes
2026-03-06 5:05 ` Siddharth Asthana
2026-02-26 14:45 ` Phillip Wood
2026-03-06 5:28 ` Siddharth Asthana
2026-03-06 15:52 ` Phillip Wood
2026-03-06 16:20 ` Siddharth Asthana
2026-03-13 5:40 ` [PATCH v4 0/2] " Siddharth Asthana
2026-03-13 5:40 ` [PATCH v4 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2026-03-13 15:53 ` Junio C Hamano
2026-03-16 19:12 ` Toon Claes
2026-03-16 16:57 ` Phillip Wood
2026-03-13 5:40 ` [PATCH v4 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
2026-03-16 16:57 ` Phillip Wood
2026-03-16 19:52 ` Toon Claes
2026-03-17 10:11 ` Phillip Wood
2026-03-16 16:59 ` [PATCH v4 0/2] " Phillip Wood
2026-03-16 19:53 ` Toon Claes
2026-03-24 22:03 ` [PATCH v5 " Siddharth Asthana
2026-03-24 22:04 ` [PATCH v5 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2026-03-24 22:04 ` [PATCH v5 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
2026-03-25 6:29 ` Junio C Hamano
2026-03-25 15:10 ` Toon Claes
2026-03-25 15:38 ` Siddharth Asthana
2026-03-25 16:44 ` Phillip Wood
2026-03-25 15:36 ` Siddharth Asthana
2026-03-25 20:23 ` [PATCH v6 0/2] " Siddharth Asthana
2026-03-25 20:23 ` [PATCH v6 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2026-03-25 20:23 ` [PATCH v6 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
2026-03-28 4:33 ` Tian Yuchen
2026-03-29 16:17 ` Siddharth Asthana
2026-03-30 17:23 ` Tian Yuchen
2026-03-31 8:08 ` Toon Claes
2026-03-31 8:11 ` Toon Claes
2026-03-25 20:23 ` [PATCH v6 1/2] sequencer: extract revert message formatting into shared function Siddharth Asthana
2026-03-25 20:23 ` [PATCH v6 2/2] replay: add --revert mode to reverse commit changes Siddharth Asthana
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