docs: def add(self, name, arcname=None, **kwargs):
          """
          Add a file or directory to the context tarball.
  
          :param name: File or directory path.
          :type name: unicode | str
          :param args: Additional args for :meth:`tarfile.TarFile.add`.
          :param kwargs: Additional kwargs for :meth:`tarfile.TarFile.add`.
          """
          if os.path.isdir(name):
              exclusions = get_exclusions(name)
              if exclusions:
                  target_prefix = os.path.abspath(arcname or name)
                  kwargs.setdefault('filter', get_filter_func(exclusions, target_prefix))
          self.tarfile.add(name, arcname=arcname, **kwargs)