Re: [RFC PATCH] config: teach `repo_config()` to allow `repo` to be NULL

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Hi Usman

On 27/02/2025 17:54, Usman Akinyemi wrote:
The `repo` value can be NULL if a builtin command is run outside
any repository. The current implementation of `repo_config()` will
fail if `repo` is NULL.

If the `repo` is NULL the `repo_config()` can ignore the repository
configuration but it should read the other configuration sources like
the system-side configuration instead of failing.

Teach the `repo_config()` to allow `repo` to be NULL by calling the
`read_very_early_config()` which read config but only enumerate system
and global settings.
"
Thanks for working on this, I like the idea but looking at read_very_early_config() it sets "opts.ignore_cmdline = 1" which means that this will ignore any config options passed with "git -c key=value". I think it would be better to call config_with_options() with the appropriate options directly.

For this to work all the commands that run outside a repository would have to read the config via repo_config(), and take care not to call any of the repo_config_get_*() functions. They mostly seem to do that but "git for-each-repo" calls repo_config_get_string_multi() - it should be easy enough to convert that to a callback when that command is updated to stop using "the_repository"

Best Wishes

Phillip

Suggested-by: Junio C Hamano <gitster@xxxxxxxxx>
Mentored-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
Signed-off-by: Usman Akinyemi <usmanakinyemi202@xxxxxxxxx>
---
  config.c | 4 ++++
  config.h | 3 +++
  2 files changed, 7 insertions(+)

diff --git a/config.c b/config.c
index 36f76fafe5..c5181fd23b 100644
--- a/config.c
+++ b/config.c
@@ -2526,6 +2526,10 @@ void repo_config_clear(struct repository *repo)
void repo_config(struct repository *repo, config_fn_t fn, void *data)
  {
+	if (!repo) {
+		read_very_early_config(fn, data);
+		return;
+	}
  	git_config_check_init(repo);
  	configset_iter(repo->config, fn, data);
  }
diff --git a/config.h b/config.h
index 5c730c4f89..1e5b22dfc4 100644
--- a/config.h
+++ b/config.h
@@ -219,6 +219,9 @@ void read_very_early_config(config_fn_t cb, void *data);
   * repo-specific one; by overwriting, the higher-priority repo-specific
   * value is left at the end).
   *
+ * In cases where the repository variable is NULL, repo_config() will
+ * call read_early_config().
+ *
   * Unlike git_config_from_file(), this function respects includes.
   */
  void repo_config(struct repository *r, config_fn_t fn, void *);





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