Re: [PATCH v2] Limit refs to fetch to minimum in shallow clones

> The main purpose of shallow clones is to reduce download by only
> fetching objects up to a certain depth from the given refs. The number
> of objects depends on how many refs to follow. So:
>
>  - Only fetch HEAD or the ref specified by --branch
>  - Only fetch tags that point to downloaded objects
>
> More tags/branches can be fetched later using git-fetch as usual.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  Only lightly tested, but seems to work.

> diff --git a/builtin/clone.c b/builtin/clone.c
> index efe8b6c..8de9248 100644
> --- a/builtin/clone.c
> +++ b/builtin/clone.c
> @@ -48,6 +48,7 @@ static int option_verbosity;
>  static int option_progress;
>  static struct string_list option_config;
>  static struct string_list option_reference;
> +static char *src_ref_prefix = "refs/heads/";

>  static int opt_parse_reference(const struct option *opt, const char *arg, int unset)
>  {
> @@ -427,9 +428,27 @@ static struct ref *wanted_peer_refs(const struct ref *refs,
>  	struct ref *local_refs = head;
>  	struct ref **tail = head ? &head->next : &local_refs;
>  
> -	get_fetch_map(refs, refspec, &tail, 0);
> -	if (!option_mirror)
> -		get_fetch_map(refs, tag_refspec, &tail, 0);
> +	if (option_depth) {
> +		struct ref *remote_head = NULL;
> +
> +		if (!option_branch)
> +			remote_head = guess_remote_head(head, refs, 0);
> +		else {
> +			struct strbuf sb = STRBUF_INIT;
> +			strbuf_addstr(&sb, src_ref_prefix);
> +			strbuf_addstr(&sb, option_branch);
> +			remote_head = find_ref_by_name(refs, sb.buf);
> +			strbuf_release(&sb);
> +		}
> +
> +		if (remote_head)
> +			get_fetch_map(remote_head, refspec, &tail, 0);