Subject: Re: [PATCH 01/44] repository: initialize the_repository in main()

From: Brandon Williams <[email-masked]>
Date: Wed, 21 Mar 2018 14:46:06 -0700

On 03/03, Nguyễn Thái Ngọc Duy wrote:
> This simplifies initialization of struct repository and anything
> inside. Easier to read. Easier to add/remove fields.
> 
> Everything will go through main() common-main.c so this should cover all
> programs, including t/helper.
> 
> Signed-off-by: Nguyễn Thái Ngọc Duy <[email-masked]>
> ---
>  common-main.c |  2 ++
>  repository.c  | 18 +++++++++++++-----
>  repository.h  |  2 +-
>  3 files changed, 16 insertions(+), 6 deletions(-)
> 
> diff --git a/common-main.c b/common-main.c
> index 6a689007e7..7d716d5a54 100644
> --- a/common-main.c
> +++ b/common-main.c
> @@ -34,6 +34,8 @@ int main(int argc, const char **argv)
>  
>  	git_setup_gettext();
>  
> +	initialize_the_repository();
> +
>  	attr_start();
>  
>  	git_extract_argv0_path(argv[0]);
> diff --git a/repository.c b/repository.c
> index 4ffbe9bc94..0eddf28fcd 100644
> --- a/repository.c
> +++ b/repository.c
> @@ -4,10 +4,16 @@
>  #include "submodule-config.h"
>  
>  /* The main repository */
> -static struct repository the_repo = {
> -	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &the_index, &hash_algos[GIT_HASH_SHA1], 0, 0
> -};
> -struct repository *the_repository = &the_repo;
> +static struct repository the_repo;
> +struct repository *the_repository;
> +
> +void initialize_the_repository(void)
> +{
> +	the_repository = &the_repo;
> +
> +	the_repo.index = &the_index;
> +	repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
> +}

Nice, one place to do all the crazy initialization for the_repo.  I
wanted to do something like this when I introduced the repository but I
shied away from it because it didn't seem like the right thing to do at
the time.  Now that its grown a bit, its definitely the right move until
using the repository object is ubiquitous enough that the setup code can
produce a repository struct instead of relying on a global one.

>  
>  static char *git_path_from_env(const char *envvar, const char *git_dir,
>  			       const char *path, int fromenv)
> @@ -128,7 +134,9 @@ static int read_and_verify_repository_format(struct repository_format *format,
>   * Initialize 'repo' based on the provided 'gitdir'.
>   * Return 0 upon success and a non-zero value upon failure.
>   */
> -int repo_init(struct repository *repo, const char *gitdir, const char *worktree)
> +static int repo_init(struct repository *repo,
> +		     const char *gitdir,
> +		     const char *worktree)
>  {
>  	struct repository_format format;
>  	memset(repo, 0, sizeof(*repo));
> diff --git a/repository.h b/repository.h
> index 0329e40c7f..40c1c81bdc 100644
> --- a/repository.h
> +++ b/repository.h
> @@ -91,7 +91,7 @@ extern struct repository *the_repository;
>  extern void repo_set_gitdir(struct repository *repo, const char *path);
>  extern void repo_set_worktree(struct repository *repo, const char *path);
>  extern void repo_set_hash_algo(struct repository *repo, int algo);
> -extern int repo_init(struct repository *repo, const char *gitdir, const char *worktree);

I had to double check that this was ok, it indeed is as repo_init is
only used in repository.c.

> +extern void initialize_the_repository(void);
>  extern int repo_submodule_init(struct repository *submodule,
>  			       struct repository *superproject,
>  			       const char *path);
> -- 
> 2.16.1.435.g8f24da2e1a
> 

-- 
Brandon Williams