Re: [PATCH v4 4/6] setup: defer object database creation

[Toon Claes <toon@iotcl.com>]

Patrick Steinhardt <ps@pks.im> writes:

> In a subsequent commit we'll make the creation of the on-disk data
> structures of an object database pluggable. This will lead to an
> in-between state where we have already configured the repository's
> object database, but it's not usable yet until we eventually call
> `create_object_directory()`.
>
> Lift the call to `odb_new()` out of `apply_repository_format()` so that
> callers have more wiggle room with when exactly they call it, and adapt
> them accordingly. The only exception is `init_db()`, where we now defer
> creating the object database until we call `create_object_database()`.
>
> With this change, initializing and creating the object database on disk
> is now neatly encapsulated in a single function, which will make it
> easier for a subsequent commit to move creation of the on-disk data
> structures into the `struct odb_source` backends.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  repository.c |  1 +
>  setup.c      | 20 ++++++++++----------
>  2 files changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/repository.c b/repository.c
> index 6d633002b4..5ec264e607 100644
> --- a/repository.c
> +++ b/repository.c
> @@ -294,6 +294,7 @@ int repo_init(struct repository *repo,
>  		warning("%s", err.buf);
>  		goto error;
>  	}
> +	repo->objects = odb_new(repo, 0);
>  
>  	if (worktree)
>  		repo_set_worktree(repo, worktree);
> diff --git a/setup.c b/setup.c
> index 5dfab3e79e..e39a1646bb 100644
> --- a/setup.c
> +++ b/setup.c
> @@ -1765,8 +1765,6 @@ int apply_repository_format(struct repository *repo,
>  			    enum apply_repository_format_flags flags,
>  			    struct strbuf *err)

I've noticed the docs in setup.h say:

    /*
     * Apply the given repository format to the repo. This initializes extensions
     * and basic data structures required for normal operation. Returns 0 on
     * success, a negative error code when the format is not valid as determined by
     * `verify_repository_format()`.
     */

I'm not sure that's still applicable, now odb_new() isn't called no
more.

>  {
> -	enum odb_new_flags odb_new_flags = 0;
> -
>  	if (verify_repository_format(format, err) < 0)
>  		return -1;
>  
> @@ -1801,10 +1799,6 @@ int apply_repository_format(struct repository *repo,
>  	repo->repository_format_precious_objects =
>  		format->precious_objects;
>  
> -	if (flags & APPLY_REPOSITORY_FORMAT_HONOR_ENV)
> -		odb_new_flags |= ODB_NEW_HONOR_ENV;
> -	repo->objects = odb_new(repo, odb_new_flags);
> -
>  	return 0;
>  }
>  
> @@ -1888,6 +1882,7 @@ const char *enter_repo(struct repository *repo, const char *path, unsigned flags
>  		read_and_verify_repository_format(&fmt, ".", NULL);
>  		if (apply_repository_format(repo, &fmt, APPLY_REPOSITORY_FORMAT_HONOR_ENV, &err) < 0)
>  			die("%s", err.buf);
> +		repo->objects = odb_new(repo, ODB_NEW_HONOR_ENV);
>  		startup_info->have_repository = 1;
>  
>  		clear_repository_format(&fmt);
> @@ -2090,6 +2085,7 @@ const char *setup_git_directory_gently(struct repository *repo, int *nongit_ok)
>  			if (apply_repository_format(repo, &discovery.format,
>  						    APPLY_REPOSITORY_FORMAT_HONOR_ENV, &err) < 0)
>  				die("%s", err.buf);
> +			repo->objects = odb_new(repo, ODB_NEW_HONOR_ENV);
>  
>  			clear_repository_format(&discovery.format);
>  			strbuf_release(&err);
> @@ -2651,11 +2647,13 @@ static int create_default_files(struct repository *repo,
>  	return reinit;
>  }
>  
> -static void create_object_directory(struct repository *repo)
> +static void create_object_database(struct repository *repo)
>  {
>  	struct strbuf path = STRBUF_INIT;
>  	size_t baselen;
>  
> +	repo->objects = odb_new(repo, ODB_NEW_HONOR_ENV);
> +
>  	strbuf_addstr(&path, repo_get_object_directory(repo));
>  	baselen = path.len;
>  
> @@ -2864,9 +2862,9 @@ int init_db(struct repository *repo,
>  	 */
>  	read_and_verify_repository_format(&repo_fmt, repo_get_git_dir(repo), NULL);
>  	repository_format_configure(&repo_fmt, hash, ref_storage_format);
> -	if (apply_repository_format(repo, &repo_fmt, APPLY_REPOSITORY_FORMAT_HONOR_ENV, &err) < 0)
> +	if (apply_repository_format(repo, &repo_fmt,
> +				    APPLY_REPOSITORY_FORMAT_HONOR_ENV, &err) < 0)

Nit: Not sure why this formatting change was needed. I would have
assumed to have all apply_repository_format() calls formatted the same,
but I've noticed at line 1883 in enter_repo() it's still a single-line
call.

>  		die("%s", err.buf);
> -	startup_info->have_repository = 1;
>  
>  	/*
>  	 * Ensure `core.hidedotfiles` is processed. This must happen after we
> @@ -2882,7 +2880,9 @@ int init_db(struct repository *repo,
>  
>  	if (!(flags & INIT_DB_SKIP_REFDB))
>  		create_reference_database(repo, initial_branch, flags & INIT_DB_QUIET);
> -	create_object_directory(repo);
> +	create_object_database(repo);
> +
> +	startup_info->have_repository = 1;
>  
>  	if (repo_settings_get_shared_repository(repo)) {
>  		char buf[10];
>
> -- 
> 2.55.0.679.g6767b8d81c.dirty
>

-- 
Cheers,
Toon