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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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)