Re: [PATCH 1/2] maintenance: add pack-refs task

[Taylor Blau <me@ttaylorr.com>]

On Mon, Feb 08, 2021 at 02:52:22PM +0000, Derrick Stolee via GitGitGadget wrote:
> +pack-refs::
> +	The `pack-refs` task collects the loose reference files and
> +	collects them into a single file. This speeds up operations that
> +	need to iterate across many refereences. See linkgit:git-pack-refs[1]
> +	for more information.
> +

Do you think it's worth documenting here or in git-gc(1) that running
this has the effect of disabling the same step during gc?

>  OPTIONS
>  -------
>  --auto::
> diff --git a/builtin/gc.c b/builtin/gc.c
> index 4c40594d660e..8f13c3bb8607 100644
> --- a/builtin/gc.c
> +++ b/builtin/gc.c
> @@ -54,7 +54,6 @@ static const char *prune_worktrees_expire = "3.months.ago";
>  static unsigned long big_pack_threshold;
>  static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE;
>
> -static struct strvec pack_refs_cmd = STRVEC_INIT;
>  static struct strvec reflog = STRVEC_INIT;
>  static struct strvec repack = STRVEC_INIT;
>  static struct strvec prune = STRVEC_INIT;
> @@ -163,6 +162,15 @@ static void gc_config(void)
>  	git_config(git_default_config, NULL);
>  }
>
> +struct maintenance_run_opts;
> +static int maintenance_task_pack_refs(struct maintenance_run_opts *opts)

It may be worth calling this "unused", since you explicitly pass NULL
below.

> +{
> +	struct strvec pack_refs_cmd = STRVEC_INIT;
> +	strvec_pushl(&pack_refs_cmd, "pack-refs", "--all", "--prune", NULL);
> +
> +	return run_command_v_opt(pack_refs_cmd.v, RUN_GIT_CMD);
> +}
> +
>  static int too_many_loose_objects(void)
>  {
>  	/*
> @@ -518,8 +526,8 @@ static void gc_before_repack(void)
>  	if (done++)
>  		return;
>
> -	if (pack_refs && run_command_v_opt(pack_refs_cmd.v, RUN_GIT_CMD))
> -		die(FAILED_RUN, pack_refs_cmd.v[0]);
> +	if (pack_refs && maintenance_task_pack_refs(NULL))
> +		die(FAILED_RUN, "pack-refs");

Hmm. Am I missing where opting into the maintenance step disables this
in gc? You suggest that it does in the commit message, but I can't seem
to see it here.

> +test_expect_success 'pack-refs task' '
> +	for n in $(test_seq 1 5)
> +	do
> +		git branch -f to-pack/$n HEAD || return 1
> +	done &&
> +	git maintenance run --task=pack-refs &&
> +	ls .git/refs/heads/ >after &&
> +	test_must_be_empty after

Worth testing that $GIT_DIR/packed-refs exists, too?

Thanks,
Taylor