code: func Clone(s storage.Storer, worktree billy.Filesystem, o *CloneOptions) (*Repository, error) {
  	return CloneContext(context.Background(), s, worktree, o)
  }
docs: // Clone a repository into the given Storer and worktree Filesystem with the
  // given options, if worktree is nil a bare repository is created. If the given
  // storer is not empty ErrRepositoryAlreadyExists is returned.
  //
  // The provided Context must be non-nil. If the context expires before the
  // operation is complete, an error is returned. The context only affects to the
  // transport operations.