Subject: Re: [PATCH v4 1/3] config: rename `git_etc_config()`

From: SZEDER Gábor <[email-masked]>
Date: Fri, 16 Apr 2021 23:14:51 +0200

On Tue, Apr 13, 2021 at 09:11:44AM +0200, Patrick Steinhardt wrote:
> The `git_etc_gitconfig()` function retrieves the system-level path of
> the configuration file. We're about to introduce a way to override it
> via an environment variable, at which point the name of this function
> would start to become misleading.
> 
> Rename the function to `git_system_config()` as a preparatory step.
> While at it, the function is also refactored to pass memory ownership to
> the caller. This is done to better match semantics of
> `git_global_config()`, which is going to be introduced in the next
> commit.
> 
> Signed-off-by: Patrick Steinhardt <[email-masked]>
> ---
>  builtin/config.c |  2 +-
>  config.c         | 18 ++++++++----------
>  config.h         |  3 ++-
>  3 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/builtin/config.c b/builtin/config.c
> index f71fa39b38..02ed0b3fe7 100644
> --- a/builtin/config.c
> +++ b/builtin/config.c
> @@ -695,7 +695,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
>  		}
>  	}
>  	else if (use_system_config) {
> -		given_config_source.file = git_etc_gitconfig();
> +		given_config_source.file = git_system_config();
>  		given_config_source.scope = CONFIG_SCOPE_SYSTEM;
>  	} else if (use_local_config) {
>  		given_config_source.file = git_pathdup("config");
> diff --git a/config.c b/config.c
> index 6428393a41..8c83669cce 100644
> --- a/config.c
> +++ b/config.c
> @@ -1844,12 +1844,9 @@ static int git_config_from_blob_ref(config_fn_t fn,
>  	return git_config_from_blob_oid(fn, name, &oid, data);
>  }
>  
> -const char *git_etc_gitconfig(void)
> +char *git_system_config(void)
>  {
> -	static const char *system_wide;
> -	if (!system_wide)
> -		system_wide = system_path(ETC_GITCONFIG);
> -	return system_wide;
> +	return system_path(ETC_GITCONFIG);
>  }
>  
>  /*
> @@ -1883,6 +1880,7 @@ static int do_git_config_sequence(const struct config_options *opts,
>  				  config_fn_t fn, void *data)
>  {
>  	int ret = 0;
> +	char *system_config = git_system_config();
>  	char *xdg_config = xdg_config_home("config");
>  	char *user_config = expand_user_path("~/.gitconfig", 0);
>  	char *repo_config;
> @@ -1896,11 +1894,10 @@ static int do_git_config_sequence(const struct config_options *opts,
>  		repo_config = NULL;
>  
>  	current_parsing_scope = CONFIG_SCOPE_SYSTEM;
> -	if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK,

Removing git_config_system() from the condition breaks
GIT_CONFIG_NOSYSTEM:

  expecting success of 9999.1 'test': 
  	cat /usr/local/etc/gitconfig &&
  	git config --list --show-origin --show-scope
  
  + cat /usr/local/etc/gitconfig
  [foo]
  	bar = baz
  + git config --list --show-origin --show-scope
  system	file:/usr/local/etc/gitconfig	foo.bar=baz
  local	file:.git/config	core.repositoryformatversion=0
  local	file:.git/config	core.filemode=true
  local	file:.git/config	core.bare=false
  local	file:.git/config	core.logallrefupdates=true
  ok 1 - test

And breaks just about everything the Linux32 job on Travis CI:

  https://travis-ci.org/github/git/git/jobs/767207687#L1218

> -						  opts->system_gently ?
> -						  ACCESS_EACCES_OK : 0))
> -		ret += git_config_from_file(fn, git_etc_gitconfig(),
> -					    data);
> +	if (system_config && !access_or_die(system_config, R_OK,
> +					    opts->system_gently ?
> +					    ACCESS_EACCES_OK : 0))
> +		ret += git_config_from_file(fn, system_config, data);
>  
>  	current_parsing_scope = CONFIG_SCOPE_GLOBAL;
>  	if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
> @@ -1927,6 +1924,7 @@ static int do_git_config_sequence(const struct config_options *opts,
>  		die(_("unable to parse command-line config"));
>  
>  	current_parsing_scope = prev_parsing_scope;
> +	free(system_config);
>  	free(xdg_config);
>  	free(user_config);
>  	free(repo_config);
> diff --git a/config.h b/config.h
> index 19a9adbaa9..2be8fa1880 100644
> --- a/config.h
> +++ b/config.h
> @@ -318,7 +318,6 @@ int git_config_rename_section(const char *, const char *);
>  int git_config_rename_section_in_file(const char *, const char *, const char *);
>  int git_config_copy_section(const char *, const char *);
>  int git_config_copy_section_in_file(const char *, const char *, const char *);
> -const char *git_etc_gitconfig(void);
>  int git_env_bool(const char *, int);
>  unsigned long git_env_ulong(const char *, unsigned long);
>  int git_config_system(void);
> @@ -327,6 +326,8 @@ int config_error_nonbool(const char *);
>  #define config_error_nonbool(s) (config_error_nonbool(s), const_error())
>  #endif
>  
> +char *git_system_config(void);
> +
>  int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
>  
>  enum config_scope current_config_scope(void);
> -- 
> 2.31.1
>