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From: Derrick Stolee <derrickstolee@github.com>
To: Junio C Hamano <gitster@pobox.com>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, vdye@github.com,
	"SZEDER Gábor" <szeder.dev@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH v4 0/4] scalar: make unregister idempotent
Date: Tue, 27 Sep 2022 12:54:08 -0400	[thread overview]
Message-ID: <9ccd46f1-4577-3075-db1c-a260fcf247ad@github.com> (raw)
In-Reply-To: <xmqqtu4s7p9q.fsf@gitster.g>

On 9/27/2022 12:31 PM, Junio C Hamano wrote:
> "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com> writes:
> 
>> I noticed this while we were updating the microsoft/git fork to include
>> v2.38.0-rc0. I don't think 'git maintenance unregister' was idempotent
>> before, but instead some change in 'scalar unregister' led to it relying on
>> the return code of 'git maintenance unregister'. Our functional tests expect
>> 'scalar unregister' to be idempotent, and I think that's a good pattern for
>> 'git maintenance unregister', so I'm fixing it at that layer.
>>
>> Despite finding this during the 2.38.0-rc0 integration, this isn't critical
>> to the release.
>>
>> Perhaps an argument could be made that "failure means it wasn't registered
>> before", but I think that isn't terribly helpful.
> 
> I happen _not_ to share the idea that "unregister is expected to be
> idempotent" is a good pattern at all, and it is a better pattern to
> make failure mean that the object specified to be acted upon did not
> even exist (cf. "rm no-such-file").  But that aside, does what the
> above paragraphs mention still true for this round, namely, you are
> "fixing" it at that (i.e. "maintenance unregister") layer?

Sorry, I forgot to update the cover letter when updating the title.
"git maintenance unregister" will fail if the repository is not already
registered (unless --force is given). Now, "scalar unregister" _is_
idempotent (it uses "git maintenance unregister --force").
 
> The cover letter does not become part of the permanent history, so
> it is not a huge deal as long as the reviewers know what they are
> looking at ;-).  Just leaving a note in case somebody who missed the
> iterations up to v3 is now interested in the topic.
> 
> Thanks for a quick iteration.

Thank you for your very careful review!

-Stolee

      reply	other threads:[~2022-09-27 16:55 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-20  1:02 [PATCH] maintenance: make unregister idempotent Derrick Stolee via GitGitGadget
2022-09-21 17:19 ` Junio C Hamano
2022-09-22 12:37   ` Derrick Stolee
2022-09-22 19:31     ` Junio C Hamano
2022-09-22 19:46       ` Derrick Stolee
2022-09-22 20:44         ` Junio C Hamano
2022-09-22 13:37 ` [PATCH v2 0/2] scalar: " Derrick Stolee via GitGitGadget
2022-09-22 13:37   ` [PATCH v2 1/2] maintenance: add 'unregister --force' Derrick Stolee via GitGitGadget
2022-09-23 13:08     ` SZEDER Gábor
2022-09-26 13:32       ` Derrick Stolee
2022-09-26 15:39         ` Ævar Arnfjörð Bjarmason
2022-09-26 17:25           ` Derrick Stolee
2022-09-26 19:17             ` Junio C Hamano
2022-09-22 13:37   ` [PATCH v2 2/2] scalar: make 'unregister' idempotent Derrick Stolee via GitGitGadget
2022-09-26 18:48   ` [PATCH v3 0/3] scalar: make unregister idempotent Derrick Stolee via GitGitGadget
2022-09-26 18:48     ` [PATCH v3 1/3] maintenance: add 'unregister --force' Derrick Stolee via GitGitGadget
2022-09-26 19:23       ` Junio C Hamano
2022-09-26 20:49         ` Derrick Stolee
2022-09-26 21:55       ` Junio C Hamano
2022-09-27 11:38         ` Derrick Stolee
2022-09-27 11:54           ` Derrick Stolee
2022-09-27 13:36             ` Ævar Arnfjörð Bjarmason
2022-09-27 13:55               ` Derrick Stolee
2022-09-26 18:48     ` [PATCH v3 2/3] scalar: make 'unregister' idempotent Derrick Stolee via GitGitGadget
2022-09-26 18:48     ` [PATCH v3 3/3] gc: replace config subprocesses with API calls Derrick Stolee via GitGitGadget
2022-09-26 19:27       ` Junio C Hamano
2022-09-27 13:56     ` [PATCH v4 0/4] scalar: make unregister idempotent Derrick Stolee via GitGitGadget
2022-09-27 13:56       ` [PATCH v4 1/4] maintenance: add 'unregister --force' Derrick Stolee via GitGitGadget
2022-09-27 13:56       ` [PATCH v4 2/4] scalar: make 'unregister' idempotent Derrick Stolee via GitGitGadget
2022-09-27 13:57       ` [PATCH v4 3/4] gc: replace config subprocesses with API calls Derrick Stolee via GitGitGadget
2022-09-27 13:57       ` [PATCH v4 4/4] string-list: document iterator behavior on NULL input Derrick Stolee via GitGitGadget
2022-09-27 16:39         ` Junio C Hamano
2022-09-27 16:31       ` [PATCH v4 0/4] scalar: make unregister idempotent Junio C Hamano
2022-09-27 16:54         ` Derrick Stolee [this message]

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