From: Phillip Wood <phillip.wood123@gmail.com>
To: Junio C Hamano <gitster@pobox.com>,
Stefan Xenos via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Christophe Poucet <christophe.poucet@gmail.com>
Subject: Re: [PATCH 01/10] technical doc: add a design doc for the evolve command
Date: Thu, 29 Sep 2022 10:17:01 +0100 [thread overview]
Message-ID: <87e7da54-b9cf-cf35-3742-640462e11ceb@dunelm.org.uk> (raw)
In-Reply-To: <xmqqedvvqgxh.fsf@gitster.g>
On 28/09/2022 23:20, Junio C Hamano wrote:
> "Stefan Xenos via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> +Rebase
>> +------
>> +In general the rebase command is treated as a modify command. When a change is
>> +rebased, the new commit replaces the original.
>> +
>> +Rebase --abort is special. Its intent is to restore git to the state it had
>> +prior to running rebase. It should move back any changes to point to the refs
>> +they had prior to running rebase and delete any new changes that were created as
>> +part of the rebase. To achieve this, rebase will save the state of all changes
>> +in refs/metas prior to running rebase and will restore the entire namespace
>> +after rebase completes (deleting any newly-created changes).
That wont work now that we have multiple worktrees. If a user starts two
rebases of two different branches in two different worktrees and aborts
one of them we loose the new meta-commits of both. Each rebase will need
to track which refs under refs/metas/ it has updated (that will also
save the overhead of copying the entire refs/metas/ subtree).
> Newly-created
>> +metacommits are left in place, but will have no effect until garbage collected
>> +since metacommits are only used if they are reachable from refs/metas.
>
> One thing that makes me nervous is how well your analysis capture
> "unusual" but still reasonable ways to use these commands, as the
> workflows of people are quite different.
>
> For example, I almost never do "git checkout topic && git rebase
> origin"; instead I would do "git checkout topic && git rebase origin
> HEAD^0" to first make a detached HEAD out of the topic, in order to
> have two copies explicitly available to be compared after "rebase"
> finishes. After doing so and get satisfied by the result of
> comparison between topic and HEAD, I may do "git checkout -B topic"
> to update. Would that leave exactly the same set of metacommits as
> the case where I didn't do the "first rebase the detached HEAD and
> then update the bracnh for real" and instead "rebase the topic"
> directly?
As I understand it we have a ref under refs/metas/ for each commit. If
that understanding is correct the two cases you describe should be
recorded identically I think.
Best Wishes
Phillip
next prev parent reply other threads:[~2022-09-29 9:18 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-23 18:55 [PATCH 00/10] Add the Git Change command Christophe Poucet via GitGitGadget
2022-09-23 18:55 ` [PATCH 01/10] technical doc: add a design doc for the evolve command Stefan Xenos via GitGitGadget
2022-09-23 19:59 ` Jerry Zhang
2022-09-28 21:26 ` Junio C Hamano
2022-09-28 22:20 ` Junio C Hamano
2022-09-29 9:17 ` Phillip Wood [this message]
2022-09-29 19:57 ` Jonathan Tan
2022-09-23 18:55 ` [PATCH 02/10] sha1-array: implement oid_array_readonly_contains Chris Poucet via GitGitGadget
2022-09-26 13:08 ` Phillip Wood
2022-09-23 18:55 ` [PATCH 03/10] ref-filter: add the metas namespace to ref-filter Chris Poucet via GitGitGadget
2022-09-26 13:13 ` Phillip Wood
2022-10-04 9:50 ` Chris P
2022-09-23 18:55 ` [PATCH 04/10] evolve: add support for parsing metacommits Stefan Xenos via GitGitGadget
2022-09-26 13:27 ` Phillip Wood
2022-10-04 11:21 ` Chris P
2022-10-04 14:10 ` Phillip Wood
2022-09-23 18:55 ` [PATCH 05/10] evolve: add the change-table structure Stefan Xenos via GitGitGadget
2022-09-27 13:27 ` Phillip Wood
2022-09-27 13:50 ` Ævar Arnfjörð Bjarmason
2022-09-27 14:13 ` Phillip Wood
2022-09-27 15:28 ` Ævar Arnfjörð Bjarmason
2022-09-28 14:33 ` Phillip Wood
2022-09-28 15:14 ` Ævar Arnfjörð Bjarmason
2022-09-28 15:59 ` Junio C Hamano
2022-09-27 14:18 ` Phillip Wood
2022-10-04 14:48 ` Chris P
2022-09-23 18:55 ` [PATCH 06/10] evolve: add support for writing metacommits Stefan Xenos via GitGitGadget
2022-09-28 14:27 ` Phillip Wood
2022-10-05 9:40 ` Chris P
2022-10-05 11:09 ` Phillip Wood
2022-09-23 18:55 ` [PATCH 07/10] evolve: implement the git change command Stefan Xenos via GitGitGadget
2022-09-25 9:10 ` Phillip Wood
2022-09-26 8:23 ` Ævar Arnfjörð Bjarmason
2022-09-26 8:25 ` Ævar Arnfjörð Bjarmason
2022-10-05 12:30 ` Chris P
2022-09-23 18:55 ` [PATCH 08/10] evolve: add the git change list command Stefan Xenos via GitGitGadget
2022-09-23 18:55 ` [PATCH 09/10] evolve: add delete command Chris Poucet via GitGitGadget
2022-09-26 8:38 ` Ævar Arnfjörð Bjarmason
2022-09-26 9:10 ` Chris Poucet
2022-09-23 18:55 ` [PATCH 10/10] evolve: add documentation for `git change` Chris Poucet via GitGitGadget
2022-09-25 8:41 ` Phillip Wood
2022-09-25 8:39 ` [PATCH 00/10] Add the Git Change command Phillip Wood
2022-10-04 9:33 ` Chris P
2022-10-04 14:24 ` Phillip Wood
2022-10-04 15:19 ` Chris P
2022-10-04 15:55 ` Chris P
2022-10-04 16:00 ` Phillip Wood
2022-10-04 15:57 ` Phillip Wood
2022-10-05 14:59 ` [PATCH v2 00/10] RFC: Git Evolve / Change Christophe Poucet via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 01/10] technical doc: add a design doc for the evolve command Stefan Xenos via GitGitGadget
2022-10-05 15:16 ` Chris Poucet
2022-10-06 20:53 ` Glen Choo
2022-10-10 19:35 ` Victoria Dye
2022-10-11 8:59 ` Phillip Wood
2022-10-11 16:59 ` Victoria Dye
2022-10-12 19:19 ` Phillip Wood
2022-10-05 14:59 ` [PATCH v2 02/10] sha1-array: implement oid_array_readonly_contains Chris Poucet via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 03/10] ref-filter: add the metas namespace to ref-filter Chris Poucet via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 04/10] evolve: add support for parsing metacommits Stefan Xenos via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 05/10] evolve: add the change-table structure Stefan Xenos via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 06/10] evolve: add support for writing metacommits Stefan Xenos via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 07/10] evolve: implement the git change command Stefan Xenos via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 08/10] evolve: add delete command Chris Poucet via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 09/10] evolve: add documentation for `git change` Chris Poucet via GitGitGadget
2022-10-05 14:59 ` [PATCH v2 10/10] evolve: add tests for the git-change command Chris Poucet via GitGitGadget
2022-10-10 9:23 ` [PATCH v2 00/10] RFC: Git Evolve / Change Phillip Wood
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