From: Junio C Hamano <gitster@pobox.com>
To: Emily Shaffer <emilyshaffer@google.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v2 2/4] introduce submodule.superprojectGitDir cache
Date: Wed, 16 Jun 2021 13:40:36 +0900 [thread overview]
Message-ID: <xmqqsg1iqv5n.fsf@gitster.g> (raw)
In-Reply-To: <20210616004508.87186-3-emilyshaffer@google.com> (Emily Shaffer's message of "Tue, 15 Jun 2021 17:45:06 -0700")
Emily Shaffer <emilyshaffer@google.com> writes:
> Teach submodules a reference to their superproject's gitdir. This allows
> us to A) know that we're running from a submodule, and B) have a
> shortcut to the superproject's vitals, for example, configs.
>
> By using a relative path instead of an absolute path, we can move the
> superproject directory around on the filesystem without breaking the
> submodule's cache.
>
> Since this cached value is only introduced during new submodule creation
> via `git submodule add`, though, there is more work to do to allow the
> cache to be created at other times.
>
> Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
> ---
> Documentation/config/submodule.txt | 12 +++++++++
> builtin/submodule--helper.c | 4 +++
> t/t7400-submodule-basic.sh | 40 ++++++++++++++++--------------
> 3 files changed, 38 insertions(+), 18 deletions(-)
>
> diff --git a/Documentation/config/submodule.txt b/Documentation/config/submodule.txt
> index d7a63c8c12..7c459cc19e 100644
> --- a/Documentation/config/submodule.txt
> +++ b/Documentation/config/submodule.txt
> @@ -90,3 +90,15 @@ submodule.alternateErrorStrategy::
> `ignore`, `info`, `die`. Default is `die`. Note that if set to `ignore`
> or `info`, and if there is an error with the computed alternate, the
> clone proceeds as if no alternate was specified.
> +
> +submodule.superprojectGitDir::
> + The relative path from the submodule's worktree to the superproject's
> + gitdir. This config should only be present in projects which are
> + submodules, but is not guaranteed to be present in every submodule. It
> + is set automatically during submodule creation.
> ++
> + In situations where more than one superproject references the same
> + submodule worktree, the value of this config and the behavior of
> + operations which use it are undefined. To reference a single project
> + from multiple superprojects, it is better to create a worktree of the
> + submodule for each superproject.
You'd need to dedent the second paragraph that follows a lone '+'
sign to typeset this correctly.
The new paragraph suggests separate worktrees for the same submodule
repository, but for that to work correctly,
- "git clone [--recurse-submodules]" that clones the second
superproject that shares the same submodule with a superproject
that we already locally has to support a way for users to tell
where to grab that existing submodule from and arrange a new
worktree, instead of creating another instance of the submodule
repository by cloning it afresh.
- The "submodule.superprojectGitDir" needs to be set to
per-worktree half of the repo-local configuration file.
Because I usually do not pay much attention to the submodule part of
the toolset, I may well be mistaken, but I suspect that the former
does not exist yet. If I recall correctly, the latter was a NEEDSWORK
item in the previous round of this patchset?
As I said, I think it is OK for now to stop at declaring that you
cannot simply do it without hinting something that may not fully
work.
Thanks.
next prev parent reply other threads:[~2021-06-16 4:40 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-11 22:54 [RFC PATCH 0/4] cache parent project's gitdir in submodules Emily Shaffer
2021-06-11 22:54 ` [RFC PATCH 1/4] t7400-submodule-basic: modernize inspect() helper Emily Shaffer
2021-06-14 4:52 ` Junio C Hamano
2021-06-11 22:54 ` [RFC PATCH 2/4] introduce submodule.superprojectGitDir cache Emily Shaffer
2021-06-14 5:09 ` Junio C Hamano
2021-06-15 22:00 ` Emily Shaffer
2021-06-11 22:54 ` [RFC PATCH 3/4] submodule: cache superproject gitdir during absorbgitdirs Emily Shaffer
2021-06-14 6:18 ` Junio C Hamano
2021-06-11 22:54 ` [RFC PATCH 4/4] submodule: cache superproject gitdir during 'update' Emily Shaffer
2021-06-14 6:22 ` Junio C Hamano
2021-06-15 21:27 ` Emily Shaffer
2021-06-12 20:12 ` [RFC PATCH 0/4] cache parent project's gitdir in submodules Jacob Keller
2021-06-14 7:26 ` Junio C Hamano
2021-06-15 21:18 ` Emily Shaffer
2021-06-16 0:45 ` [PATCH v2 " Emily Shaffer
2021-06-16 0:45 ` [PATCH v2 1/4] t7400-submodule-basic: modernize inspect() helper Emily Shaffer
2021-07-27 17:12 ` Jonathan Tan
2021-08-19 17:46 ` Emily Shaffer
2021-06-16 0:45 ` [PATCH v2 2/4] introduce submodule.superprojectGitDir cache Emily Shaffer
2021-06-16 4:40 ` Junio C Hamano [this message]
2021-06-16 4:43 ` Junio C Hamano
2021-06-18 0:03 ` Emily Shaffer
2021-06-18 0:00 ` Emily Shaffer
2021-07-27 17:46 ` Jonathan Tan
2021-08-19 17:53 ` Emily Shaffer
2021-10-14 19:25 ` Ævar Arnfjörð Bjarmason
2021-06-16 0:45 ` [PATCH v2 3/4] submodule: cache superproject gitdir during absorbgitdirs Emily Shaffer
2021-06-16 0:45 ` [PATCH v2 4/4] submodule: cache superproject gitdir during 'update' Emily Shaffer
2021-07-27 17:51 ` Jonathan Tan
2021-08-19 18:02 ` Emily Shaffer
2021-08-19 20:09 ` [PATCH v3 0/4] cache parent project's gitdir in submodules Emily Shaffer
2021-08-19 20:09 ` [PATCH v3 1/4] t7400-submodule-basic: modernize inspect() helper Emily Shaffer
2021-08-19 20:09 ` [PATCH v3 2/4] introduce submodule.superprojectGitDir record Emily Shaffer
2021-08-20 0:38 ` Derrick Stolee
2021-10-13 19:36 ` Emily Shaffer
2021-09-04 17:20 ` Matheus Tavares
2021-10-13 19:39 ` Emily Shaffer
2021-08-19 20:09 ` [PATCH v3 3/4] submodule: record superproject gitdir during absorbgitdirs Emily Shaffer
2021-08-20 0:50 ` Derrick Stolee
2021-10-13 19:42 ` Emily Shaffer
2021-09-04 17:27 ` Matheus Tavares
2021-10-14 18:40 ` Emily Shaffer
2021-08-19 20:09 ` [PATCH v3 4/4] submodule: record superproject gitdir during 'update' Emily Shaffer
2021-08-20 0:59 ` Derrick Stolee
2021-10-14 18:45 ` Emily Shaffer
2021-08-19 21:56 ` [PATCH v3 0/4] cache parent project's gitdir in submodules Junio C Hamano
2021-08-20 1:09 ` Derrick Stolee
2021-10-13 18:51 ` Emily Shaffer
2021-10-14 17:12 ` Derrick Stolee
2021-10-14 18:52 ` Emily Shaffer
2021-09-04 17:50 ` Matheus Tavares Bernardino
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