code: def unique_id(self):
          
          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
docs: Determine a "unique id" for this repository
  
          Returns:
              str: Repository UUID of this repository