Re: [PATCHv6 7/7] submodule: add absorb-git-dir function

> diff --git a/dir.c b/dir.c
> index 8b74997c66..cc5729f733 100644
> --- a/dir.c
> +++ b/dir.c
> @@ -2774,3 +2774,15 @@ void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
>         free(real_work_tree);
>         free(real_git_dir);
>  }
> +
> +/*
> + * Migrate the git directory of the given path from old_git_dir to new_git_dir.
> + */
> +void relocate_gitdir(const char *path, const char *old_git_dir, const char *new_git_dir)
> +{
> +       if (rename(old_git_dir, new_git_dir) < 0)
> +               die_errno(_("could not migrate git directory from '%s' to '%s'"),
> +                       old_git_dir, new_git_dir);
> +
> +       connect_work_tree_and_git_dir(path, new_git_dir);
> +}