Subject: Re: [PATCH v2 2/3] builtin/repack.c: parse `--max-pack-size` with OPT_MAGNITUDE

From: Patrick Steinhardt <[email-masked]>
Date: Thu, 5 Oct 2023 13:31:02 +0200

On Mon, Oct 02, 2023 at 08:44:29PM -0400, Taylor Blau wrote:
> The repack builtin takes a `--max-pack-size` command-line argument which
> it uses to feed into any of the pack-objects children that it may spawn
> when generating a new pack.
> 
> This option is parsed with OPT_STRING, meaning that we'll accept
> anything as input, punting on more fine-grained validation until we get
> down into pack-objects.
> 
> This is fine, but it's wasteful to spend an entire sub-process just to
> figure out that one of its option is bogus. Instead, parse the value of
> `--max-pack-size` with OPT_MAGNITUDE in 'git repack', and then pass the
> knonw-good result down to pack-objects.

Tiny nit: s/knonw/known.

Other than that this patch looks good to me.

Patrick

> Suggested-by: Junio C Hamano <[email-masked]>
> Signed-off-by: Taylor Blau <[email-masked]>
> ---
>  builtin/repack.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/builtin/repack.c b/builtin/repack.c
> index 529e13120d..8a5bbb9cba 100644
> --- a/builtin/repack.c
> +++ b/builtin/repack.c
> @@ -51,7 +51,7 @@ struct pack_objects_args {
>  	const char *window_memory;
>  	const char *depth;
>  	const char *threads;
> -	const char *max_pack_size;
> +	unsigned long max_pack_size;
>  	int no_reuse_delta;
>  	int no_reuse_object;
>  	int quiet;
> @@ -242,7 +242,7 @@ static void prepare_pack_objects(struct child_process *cmd,
>  	if (args->threads)
>  		strvec_pushf(&cmd->args, "--threads=%s", args->threads);
>  	if (args->max_pack_size)
> -		strvec_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
> +		strvec_pushf(&cmd->args, "--max-pack-size=%lu", args->max_pack_size);
>  	if (args->no_reuse_delta)
>  		strvec_pushf(&cmd->args, "--no-reuse-delta");
>  	if (args->no_reuse_object)
> @@ -946,7 +946,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
>  				N_("limits the maximum delta depth")),
>  		OPT_STRING(0, "threads", &po_args.threads, N_("n"),
>  				N_("limits the maximum number of threads")),
> -		OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
> +		OPT_MAGNITUDE(0, "max-pack-size", &po_args.max_pack_size,
>  				N_("maximum size of each packfile")),
>  		OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
>  				N_("repack objects in packs marked with .keep")),
> -- 
> 2.42.0.310.g9604b54f73.dirty
>