Re: [PATCH v3 03/28] clone: prevent --reference to a shallow repository

> If we borrow objects from another repository, we should also pay
> attention to their $GIT_DIR/shallow (and even info/grafts). But
> current alternates code does not.
>
> Reject alternate repos that are shallow because we do not do it
> right. In future we alternate code may be updated to check

> $GIT_DIR/shallow properly so that this restriction could be lifted.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  builtin/clone.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/builtin/clone.c b/builtin/clone.c
> index 874e0fd..900f564 100644
> --- a/builtin/clone.c
> +++ b/builtin/clone.c
> @@ -252,6 +252,12 @@ static int add_one_reference(struct string_list_item *item, void *cb_data)
>                 die(_("reference repository '%s' is not a local repository."),
>                     item->string);
>
> +       if (!access(mkpath("%s/shallow", ref_git), F_OK))
> +               die(_("reference repository '%s' is shallow"), item->string);
> +
> +       if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
> +               die(_("reference repository '%s' is grafted"), item->string);
> +
>         strbuf_addf(&alternate, "%s/objects", ref_git);
>         add_to_alternates_file(alternate.buf);
>         strbuf_release(&alternate);
> --
> 1.8.2.83.gc99314b