Sets up the working directory and returns a tuple of
        (dirname, repo )

def set_up_clone(self, repo_name, remote_repo):
        """Sets up the working directory and returns a tuple of
        (dirname, repo )"""
        dirname = self.clone_dir(repo_name)
        self.to_cleanup[repo_name] = dirname
        klass = self.get_repo_class()
        repo = klass(repo_name,
                     dirname,
                     self.tools,
                     self.executor,
                     shallow=self.shallow_clone)
        return (dirname, repo)