Fills up given stream.

        :param stream: file like object.
        :param kind: one of following: ``zip``, ``tgz`` or ``tbz2``.
            Default: ``tgz``.
        :param prefix: name of root directory in archive.
            Default is repository name and changeset's raw_id joined with dash
            (``repo-tip.<KIND>``).
        :param subrepos: include subrepos in this archive.

        :raise ImproperArchiveTypeError: If given kind is wrong.
        :raise VcsError: If given stream is None

def fill_archive(self, stream=None, kind='tgz', prefix=None,
                     subrepos=False):
        """
        Fills up given stream.

        :param stream: file like object.
        :param kind: one of following: ``zip``, ``tgz`` or ``tbz2``.
            Default: ``tgz``.
        :param prefix: name of root directory in archive.
            Default is repository name and changeset's raw_id joined with dash
            (``repo-tip.<KIND>``).
        :param subrepos: include subrepos in this archive.

        :raise ImproperArchiveTypeError: If given kind is wrong.
        :raise VcsError: If given stream is None
        """

        allowed_kinds = settings.ARCHIVE_SPECS.keys()
        if kind not in allowed_kinds:
            raise ImproperArchiveTypeError('Archive kind not supported use one'
                'of %s', allowed_kinds)

        if stream is None:
            raise VCSError('You need to pass in a valid stream for filling'
                           ' with archival data')

        if prefix is None:
            prefix = '%s-%s' % (self.repository.name, self.short_id)
        elif prefix.startswith('/'):
            raise VCSError("Prefix cannot start with leading slash")
        elif prefix.strip() == '':
            raise VCSError("Prefix cannot be empty")

        archival.archive(self.repository._repo, stream, self.raw_id,
                         kind, prefix=prefix, subrepos=subrepos)

        if stream.closed and hasattr(stream, 'name'):
            stream = open(stream.name, 'rb')
        elif hasattr(stream, 'mode') and 'r' not in stream.mode:
            stream = open(stream.name, 'rb')
        else:
            stream.seek(0)