def unique_id(self):
        """
        Determine a "unique id" for this repository

        Returns:
            str: Repository UUID of this repository
        """
        cmd = 'svn info | grep "^Repository UUID"'
        cmdo = self.sh(cmd,
                       shell=True,
                       ignore_error=True)
        if cmdo:
            return cmdo.split(': ', 1)[1].rstrip()
        return None
Determine a "unique id" for this repository

        Returns:
            str: Repository UUID of this repository