Re: [PATCH v3 5/9] builtin/clone: move setup of alternates for shared local clones

> When cloning a local repository with "--shared" we add that repository
> to the new repository's alternates. This is done in `clone_local()`,
> which is responsible for performing local clones.
> 
> Move the logic into `collect_alternates()` to unify our setup of
> alternates. Furthermore, this will allow us to set up alternates right
> at creation time of the object database.
> 
> Note that the logic for cloning a local repository with "--no-shared" is
> not yet part of `collect_alternates()`. This will be handled in the next
> commit.
> 
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  builtin/clone.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/builtin/clone.c b/builtin/clone.c
> index 8786a49332..011fc867c8 100644
> --- a/builtin/clone.c
> +++ b/builtin/clone.c
> @@ -220,7 +220,8 @@ static void copy_alternates(struct strbuf *src, const char *src_repo)
>  	fclose(in);
>  }
>  
> -static void collect_alternates(struct strvec *alternates)
> +static void collect_alternates(struct strvec *alternates,
> +			       const char *src_repo, bool is_local)
>  {
>  	if (option_required_reference.nr || option_optional_reference.nr) {
>  		struct add_one_alternate_data data = {
> @@ -234,6 +235,16 @@ static void collect_alternates(struct strvec *alternates)
>  		for_each_string_list(&option_optional_reference,
>  				     add_one_alternate, &data);
>  	}
> +
> +	if (is_local) {

> +		struct strbuf commondir = STRBUF_INIT;
> +
> +		get_common_dir(&commondir, src_repo);
> +		if (option_shared)
> +			strvec_pushf(alternates, "%s/objects", commondir.buf);
> +
> +		strbuf_release(&commondir);
> +	}