From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Glen Choo via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Jonathan Tan <jonathantanmy@google.com>,
Emily Shaffer <nasamuffin@google.com>, Jeff King <peff@peff.net>,
Derrick Stolee <derrickstolee@github.com>,
Glen Choo <chooglen@google.com>
Subject: Re: [PATCH 0/6] [RFC] config.c: use struct for config reading state
Date: Tue, 07 Mar 2023 12:57:15 +0100 [thread overview]
Message-ID: <230307.86wn3szrzu.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <pull.1463.git.git.1677631097.gitgitgadget@gmail.com>
On Wed, Mar 01 2023, Glen Choo via GitGitGadget wrote:
> This RFC is preparation for config.[ch] to be libified as as part of the
> libification effort that Emily described in [1]. One of the first goals is
> to read config from a file, but the trouble with how config.c is written
> today is that all reading operations rely on global state, so before turning
> that into a library, we'd want to make that state non-global.
>
> This series gets us about halfway there; it does enough plumbing for a
> workable-but-kinda-ugly library interface, but with a little bit more work,
> I think we can get rid of global state in-tree as well. That requires a fair
> amount of work though, so I'd like to get thoughts on that before starting
> work.
>
> = Description
>
> This series extracts the global config reading state into "struct
> config_reader" and plumbs it through the config reading machinery. It's very
> similar to how we've plumbed "struct repository" and other 'context objects'
> in the past, except:
>
> * The global state (named "the_reader") for the git process lives in a
> config.c static variable, and not on "the_repository". See 3/6 for the
> rationale.
I agree with the overall direction, but don't think that rationale in
3/6 is sufficient to go in this "the_reader" direction, as opposed to
sticking with and extending "the_repository" approach.
For orthagonal reasons (getting rid of some of the API duplication) I've
been carrying a patch to get rid of the "configset" part of the *public*
API, i.e. to have API users always use the "repo_config_*()" or
"git_config_*()" variants, that patch is at:
https://github.com/avar/git/commit/0233297a359bbda43a902dd0213aacdca82faa34
All of the rationale in your 3/6 is true now, but as that patch shows
the reason for why we have "the_repository" is for the trivial reason
that we want to access the repo's "config" member.
It's a bit distasteful, but that change argues that just mocking up a
"struct repository" with a "config" member pointing to a new configset
is better than maintaining an entirely different API just for those
cases where we need to parse a one-off file or whatever.
I think that going in that direction neatly solves the issues you're
noting here and in your 3/6, i.e. we'd always have this in the "repo"
object, so we'd just stick the persistent "reader" variables in the
"struct repository"'s "config" member.
next prev parent reply other threads:[~2023-03-07 12:05 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 0:38 [PATCH 0/6] [RFC] config.c: use struct for config reading state Glen Choo via GitGitGadget
2023-03-01 0:38 ` [PATCH 1/6] config.c: plumb config_source through static fns Glen Choo via GitGitGadget
2023-03-03 18:02 ` Junio C Hamano
2023-03-01 0:38 ` [PATCH 2/6] config.c: don't assign to "cf" directly Glen Choo via GitGitGadget
2023-03-01 0:38 ` [PATCH 3/6] config.c: create config_reader and the_reader Glen Choo via GitGitGadget
2023-03-03 18:05 ` Junio C Hamano
2023-03-01 0:38 ` [PATCH 4/6] config.c: plumb the_reader through callbacks Glen Choo via GitGitGadget
2023-03-08 9:54 ` Ævar Arnfjörð Bjarmason
2023-03-08 18:00 ` Glen Choo
2023-03-08 18:07 ` Junio C Hamano
2023-03-01 0:38 ` [PATCH 5/6] config.c: remove current_config_kvi Glen Choo via GitGitGadget
2023-03-06 20:12 ` Calvin Wan
2023-03-01 0:38 ` [PATCH 6/6] config.c: remove current_parsing_scope Glen Choo via GitGitGadget
2023-03-06 19:57 ` [PATCH 0/6] [RFC] config.c: use struct for config reading state Jonathan Tan
2023-03-06 21:45 ` Glen Choo
2023-03-06 22:38 ` Jonathan Tan
2023-03-08 10:32 ` Ævar Arnfjörð Bjarmason
2023-03-08 23:09 ` Glen Choo
2023-03-07 11:57 ` Ævar Arnfjörð Bjarmason [this message]
2023-03-07 18:22 ` Glen Choo
2023-03-07 18:36 ` Ævar Arnfjörð Bjarmason
2023-03-07 19:36 ` Junio C Hamano
2023-03-07 22:53 ` Glen Choo
2023-03-08 9:17 ` Ævar Arnfjörð Bjarmason
2023-03-08 23:18 ` Glen Choo
2023-03-16 0:11 ` [PATCH v2 0/8] " Glen Choo via GitGitGadget
2023-03-16 0:11 ` [PATCH v2 1/8] config.c: plumb config_source through static fns Glen Choo via GitGitGadget
2023-03-16 21:16 ` Jonathan Tan
2023-03-16 0:11 ` [PATCH v2 2/8] config.c: don't assign to "cf_global" directly Glen Choo via GitGitGadget
2023-03-16 21:18 ` Jonathan Tan
2023-03-16 21:31 ` Junio C Hamano
2023-03-16 22:56 ` Glen Choo
2023-03-16 0:11 ` [PATCH v2 3/8] config.c: create config_reader and the_reader Glen Choo via GitGitGadget
2023-03-16 21:22 ` Jonathan Tan
2023-03-16 0:11 ` [PATCH v2 4/8] config.c: plumb the_reader through callbacks Glen Choo via GitGitGadget
2023-03-16 0:11 ` [PATCH v2 5/8] config.c: remove current_config_kvi Glen Choo via GitGitGadget
2023-03-16 0:11 ` [PATCH v2 6/8] config.c: remove current_parsing_scope Glen Choo via GitGitGadget
2023-03-16 0:11 ` [PATCH v2 7/8] config: report cached filenames in die_bad_number() Glen Choo via GitGitGadget
2023-03-16 22:22 ` Jonathan Tan
2023-03-16 23:05 ` Glen Choo
2023-03-16 0:11 ` [PATCH v2 8/8] config.c: rename "struct config_source cf" Glen Choo via GitGitGadget
2023-03-16 0:15 ` [PATCH v2 0/8] config.c: use struct for config reading state Glen Choo
2023-03-16 22:29 ` Jonathan Tan
2023-03-17 5:01 ` [RFC PATCH 0/5] bypass config.c global state with configset Ævar Arnfjörð Bjarmason
2023-03-17 5:01 ` [RFC PATCH 1/5] config.h: move up "struct key_value_info" Ævar Arnfjörð Bjarmason
2023-03-17 5:01 ` [RFC PATCH 2/5] config.c: use "enum config_origin_type", not "int" Ævar Arnfjörð Bjarmason
2023-03-17 5:01 ` [RFC PATCH 3/5] config API: add a config_origin_type_name() helper Ævar Arnfjörð Bjarmason
2023-03-17 5:01 ` [RFC PATCH 4/5] config.c: refactor configset_iter() Ævar Arnfjörð Bjarmason
2023-03-17 5:01 ` [RFC PATCH 5/5] config API: add and use a repo_config_kvi() Ævar Arnfjörð Bjarmason
2023-03-17 17:17 ` Junio C Hamano
2023-03-17 20:59 ` Jonathan Tan
2023-03-17 16:21 ` [RFC PATCH 0/5] bypass config.c global state with configset Junio C Hamano
2023-03-17 16:28 ` Glen Choo
2023-03-17 19:20 ` Glen Choo
2023-03-17 23:32 ` Glen Choo
2023-03-29 11:53 ` Ævar Arnfjörð Bjarmason
2023-03-28 17:51 ` [PATCH v3 0/8] config.c: use struct for config reading state Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 1/8] config.c: plumb config_source through static fns Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 2/8] config.c: don't assign to "cf_global" directly Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 3/8] config.c: create config_reader and the_reader Glen Choo via GitGitGadget
2023-03-29 10:41 ` Ævar Arnfjörð Bjarmason
2023-03-29 18:57 ` Junio C Hamano
2023-03-29 20:02 ` Glen Choo
2023-03-30 17:51 ` Glen Choo
2023-03-28 17:51 ` [PATCH v3 4/8] config.c: plumb the_reader through callbacks Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 5/8] config.c: remove current_config_kvi Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 6/8] config.c: remove current_parsing_scope Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 7/8] config: report cached filenames in die_bad_number() Glen Choo via GitGitGadget
2023-03-28 17:51 ` [PATCH v3 8/8] config.c: rename "struct config_source cf" Glen Choo via GitGitGadget
2023-03-28 18:00 ` [PATCH v3 0/8] config.c: use struct for config reading state Glen Choo
2023-03-28 20:14 ` Junio C Hamano
2023-03-28 21:24 ` Glen Choo
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