From: Derrick Stolee <derrickstolee@github.com>
To: Glen Choo via GitGitGadget <gitgitgadget@gmail.com>, git@vger.kernel.org
Cc: Taylor Blau <me@ttaylorr.com>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
Junio C Hamano <gitster@pobox.com>,
Emily Shaffer <emilyshaffer@google.com>,
Glen Choo <chooglen@google.com>
Subject: Re: [PATCH v3 2/5] config: read protected config with `git_protected_config()`
Date: Thu, 2 Jun 2022 08:56:56 -0400 [thread overview]
Message-ID: <802c3541-3301-43fc-c39e-edd44e61a4eb@github.com> (raw)
In-Reply-To: <7499a2809615d42eaf3649e1c33f38d099d27c1a.1653685761.git.gitgitgadget@gmail.com>
On 5/27/2022 5:09 PM, Glen Choo via GitGitGadget wrote:
> From: Glen Choo <chooglen@google.com>
>
> Protected config is read using `read_very_early_config()`, which has
> several downsides:
>
> - Every call to `read_very_early_config()` parses global and
> system-level config files anew, but this can be optimized by just
> parsing them once [1].
> - Protected variables should respect "-c" because we can reasonably
> assume that it comes from the user. But, `read_very_early_config()`
> can't use "-c" because it is called so early that it does not have
> access to command line arguments.
>
> Introduce `git_protected_config()`, which reads protected config and
> caches the values in `the_repository.protected_config`. Then, refactor
> `safe.directory` to use `git_protected_config()`.
>
> This implementation can still be improved, however:
>
> - `git_protected_config()` iterates through every variable in
> `the_repository.protected_config`, which may still be too expensive to
> be called in every "git" invocation. There exist constant time lookup
> functions for non-protected config (repo_config_get_*()), but for
> simplicity, this commit does not implement similar functions for
> protected config.
I originally thought that we should jump to that "right" solution, but
the existing logic in ensure_valid_ownership() uses the iterator method,
mostly because it uses a multi-valued string. There are helpers that
allow iterating over a specific multi-valued key, but there is no reason
to complicate the current patch with that amount of refactoring. That
can be handled as a completely separate topic.
> - Protected config is stored in `the_repository` so that we don't need
> to statically allocate it. But this might be confusing since protected
> config ignores repository config by definition.
I agree with Junio's suggestion of keeping this as a static global in
config.c, accessible only by the public methods from config.h. A future
where we have "the_world" might be nice for inventory on all these
globals. Definitely not something to hold up this series.
> +/* Read protected config into the_repository->protected_config. */
> +static void read_protected_config(void)
> +{
> + char *xdg_config = NULL, *user_config = NULL, *system_config = NULL;
> +
> + CALLOC_ARRAY(the_repository->protected_config, 1);
> + git_configset_init(the_repository->protected_config);
> +
> + system_config = git_system_config();
> + git_global_config(&user_config, &xdg_config);
> +
> + git_configset_add_file(the_repository->protected_config, system_config);
> + git_configset_add_file(the_repository->protected_config, xdg_config);
> + git_configset_add_file(the_repository->protected_config, user_config);
> +
> + free(system_config);
> + free(xdg_config);
> + free(user_config);
> +}
This loads the config from three files, including the xdg_config, which
I wasn't thinking about before.
This implementation does not use the -c config yet, which you listed as
a downside of read_very_early_config(). I see that you include that in
your patch 4, but the commit message for this patch could list that as a
step that will be handled by a later change.
(You could also do that as patch 3 and add a test near the existing
safe.directory tests instead of waiting for discovery.bare.)
> +
> +/* Ensure that the_repository->protected_config has been initialized. */
> +static void git_protected_config_check_init(void)
> +{
> + if (the_repository->protected_config &&
> + the_repository->protected_config->hash_initialized)
> + return;
> + read_protected_config();
> +}
> +
> +void git_protected_config(config_fn_t fn, void *data)
> +{
> + git_protected_config_check_init();
> + configset_iter(the_repository->protected_config, fn, data);
> +}
These two methods are clearly correct.
..._check_init() is an OK name. I've seen us use "prepare_...()" in
other areas as a way of making sure that we have the proper state
(see prepare_packed_git() and the like), so maybe a rename here to
match would be worthwhile. Feel free to ignore.
> + if (repo->protected_config) {
> + git_configset_clear(repo->protected_config);
> + FREE_AND_NULL(repo->protected_config);
> + }
This will have no equivalent when protected_config is left as a
static global, but that is fine. It only goes out of scope with
the end of the process, anyway.
> @@ -1128,7 +1128,7 @@ static int ensure_valid_ownership(const char *path)
> is_path_owned_by_current_user(path))
> return 1;
>
> - read_very_early_config(safe_directory_cb, &data);
> + git_protected_config(safe_directory_cb, &data);
Nice to have a very simple conversion here.
Thanks,
-Stolee
next prev parent reply other threads:[~2022-06-02 12:57 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-06 18:30 [PATCH] [RFC] setup.c: make bare repo discovery optional Glen Choo via GitGitGadget
2022-05-06 20:33 ` Junio C Hamano
2022-05-09 21:42 ` Taylor Blau
2022-05-09 22:54 ` Junio C Hamano
2022-05-09 23:57 ` Taylor Blau
2022-05-10 0:23 ` Junio C Hamano
2022-05-10 22:00 ` Glen Choo
2022-05-13 23:37 ` [PATCH v2 0/2] " Glen Choo via GitGitGadget
2022-05-13 23:37 ` [PATCH v2 1/2] " Glen Choo via GitGitGadget
2022-05-16 18:12 ` Glen Choo
2022-05-16 18:46 ` Derrick Stolee
2022-05-16 22:25 ` Taylor Blau
2022-05-17 20:24 ` Glen Choo
2022-05-17 21:51 ` Glen Choo
2022-05-13 23:37 ` [PATCH v2 2/2] setup.c: learn discovery.bareRepository=cwd Glen Choo via GitGitGadget
2022-05-16 18:49 ` Derrick Stolee
2022-05-16 16:40 ` [PATCH v2 0/2] setup.c: make bare repo discovery optional Junio C Hamano
2022-05-16 18:36 ` Glen Choo
2022-05-16 19:16 ` Junio C Hamano
2022-05-16 20:27 ` Glen Choo
2022-05-16 22:16 ` Junio C Hamano
2022-05-16 16:43 ` Junio C Hamano
2022-05-16 19:07 ` Derrick Stolee
2022-05-16 22:43 ` Taylor Blau
2022-05-16 23:19 ` Junio C Hamano
2022-05-17 18:56 ` Glen Choo
2022-05-27 21:09 ` [PATCH v3 0/5] config: introduce discovery.bare and protected config Glen Choo via GitGitGadget
2022-05-27 21:09 ` [PATCH v3 1/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-05-27 23:29 ` Junio C Hamano
2022-06-02 12:42 ` Derrick Stolee
2022-06-02 16:53 ` Junio C Hamano
2022-06-02 17:39 ` Glen Choo
2022-06-03 15:57 ` Glen Choo
2022-05-27 21:09 ` [PATCH v3 2/5] config: read protected config with `git_protected_config()` Glen Choo via GitGitGadget
2022-05-28 0:28 ` Junio C Hamano
2022-05-31 17:43 ` Glen Choo
2022-06-01 15:58 ` Junio C Hamano
2022-06-02 12:56 ` Derrick Stolee [this message]
2022-05-27 21:09 ` [PATCH v3 3/5] setup.c: create `discovery.bare` Glen Choo via GitGitGadget
2022-05-28 0:59 ` Junio C Hamano
2022-06-02 13:11 ` Derrick Stolee
2022-05-27 21:09 ` [PATCH v3 4/5] config: include "-c" in protected config Glen Choo via GitGitGadget
2022-06-02 13:15 ` Derrick Stolee
2022-05-27 21:09 ` [PATCH v3 5/5] upload-pack: make uploadpack.packObjectsHook protected Glen Choo via GitGitGadget
2022-06-02 13:18 ` Derrick Stolee
2022-06-07 20:57 ` [PATCH v4 0/5] config: introduce discovery.bare and protected config Glen Choo via GitGitGadget
2022-06-07 20:57 ` [PATCH v4 1/5] Documentation/git-config.txt: add SCOPES section Glen Choo via GitGitGadget
2022-06-07 20:57 ` [PATCH v4 2/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-06-22 21:58 ` Jonathan Tan
2022-06-23 18:21 ` Glen Choo
2022-06-07 20:57 ` [PATCH v4 3/5] config: read protected config with `git_protected_config()` Glen Choo via GitGitGadget
2022-06-07 22:49 ` Junio C Hamano
2022-06-08 0:22 ` Glen Choo
2022-06-07 20:57 ` [PATCH v4 4/5] safe.directory: use git_protected_config() Glen Choo via GitGitGadget
2022-06-07 20:57 ` [PATCH v4 5/5] setup.c: create `discovery.bare` Glen Choo via GitGitGadget
2022-06-07 21:37 ` Glen Choo
2022-06-22 22:03 ` [PATCH v4 0/5] config: introduce discovery.bare and protected config Jonathan Tan
2022-06-23 17:13 ` Glen Choo
2022-06-23 18:32 ` Junio C Hamano
2022-06-27 17:34 ` Glen Choo
2022-06-27 18:19 ` Glen Choo
2022-06-27 18:36 ` [PATCH v5 " Glen Choo via GitGitGadget
2022-06-27 18:36 ` [PATCH v5 1/5] Documentation/git-config.txt: add SCOPES section Glen Choo via GitGitGadget
2022-06-27 18:36 ` [PATCH v5 2/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-06-27 18:36 ` [PATCH v5 3/5] config: learn `git_protected_config()` Glen Choo via GitGitGadget
2022-06-27 18:36 ` [PATCH v5 4/5] safe.directory: use git_protected_config() Glen Choo via GitGitGadget
2022-06-27 18:36 ` [PATCH v5 5/5] setup.c: create `discovery.bare` Glen Choo via GitGitGadget
2022-06-30 13:20 ` Ævar Arnfjörð Bjarmason
2022-06-30 17:28 ` Glen Choo
2022-06-30 18:13 ` [PATCH v6 0/5] config: introduce discovery.bare and protected config Glen Choo via GitGitGadget
2022-06-30 18:13 ` [PATCH v6 1/5] Documentation/git-config.txt: add SCOPES section Glen Choo via GitGitGadget
2022-06-30 22:32 ` Taylor Blau
2022-07-06 17:44 ` Glen Choo
2022-06-30 18:13 ` [PATCH v6 2/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-06-30 23:49 ` Taylor Blau
2022-07-06 18:21 ` Glen Choo
2022-06-30 18:13 ` [PATCH v6 3/5] config: learn `git_protected_config()` Glen Choo via GitGitGadget
2022-07-01 1:22 ` Taylor Blau
2022-07-06 22:42 ` Glen Choo
2022-06-30 18:13 ` [PATCH v6 4/5] safe.directory: use git_protected_config() Glen Choo via GitGitGadget
2022-06-30 18:13 ` [PATCH v6 5/5] setup.c: create `discovery.bare` Glen Choo via GitGitGadget
2022-07-01 1:30 ` Taylor Blau
2022-07-07 19:55 ` Glen Choo
2022-06-30 22:13 ` [PATCH v6 0/5] config: introduce discovery.bare and protected config Taylor Blau
2022-06-30 23:07 ` Ævar Arnfjörð Bjarmason
2022-07-01 17:37 ` Glen Choo
2022-07-08 21:58 ` Ævar Arnfjörð Bjarmason
2022-07-12 20:47 ` Glen Choo
2022-07-12 23:53 ` Ævar Arnfjörð Bjarmason
2022-07-07 23:01 ` [PATCH v7 " Glen Choo via GitGitGadget
2022-07-07 23:01 ` [PATCH v7 1/5] Documentation/git-config.txt: add SCOPES section Glen Choo via GitGitGadget
2022-07-07 23:43 ` Junio C Hamano
2022-07-08 17:01 ` Glen Choo
2022-07-08 19:01 ` Junio C Hamano
2022-07-08 21:38 ` Glen Choo
2022-07-07 23:01 ` [PATCH v7 2/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-07-08 0:39 ` Junio C Hamano
2022-07-07 23:01 ` [PATCH v7 3/5] config: learn `git_protected_config()` Glen Choo via GitGitGadget
2022-07-07 23:01 ` [PATCH v7 4/5] safe.directory: use git_protected_config() Glen Choo via GitGitGadget
2022-07-07 23:01 ` [PATCH v7 5/5] setup.c: create `discovery.bare` Glen Choo via GitGitGadget
2022-07-08 1:07 ` [PATCH v7 0/5] config: introduce discovery.bare and protected config Junio C Hamano
2022-07-08 20:35 ` Glen Choo
2022-07-12 22:11 ` Glen Choo
2022-07-14 21:27 ` [PATCH v8 0/5] config: introduce safe.bareRepository " Glen Choo via GitGitGadget
2022-07-14 21:27 ` [PATCH v8 1/5] Documentation/git-config.txt: add SCOPES section Glen Choo via GitGitGadget
2022-07-14 21:27 ` [PATCH v8 2/5] Documentation: define protected configuration Glen Choo via GitGitGadget
2022-07-14 21:27 ` [PATCH v8 3/5] config: learn `git_protected_config()` Glen Choo via GitGitGadget
2022-07-25 18:26 ` SANITIZE=address failure on master (was: [PATCH v8 3/5] config: learn `git_protected_config()`) Ævar Arnfjörð Bjarmason
2022-07-25 20:15 ` Glen Choo
2022-07-25 20:41 ` Ævar Arnfjörð Bjarmason
2022-07-25 20:56 ` Glen Choo
2022-07-14 21:28 ` [PATCH v8 4/5] safe.directory: use git_protected_config() Glen Choo via GitGitGadget
2022-07-14 21:28 ` [PATCH v8 5/5] setup.c: create `safe.bareRepository` Glen Choo via GitGitGadget
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