code: def _ParseInsserv(self, data):
      
      p = config_file.FieldParser()
      entries = p.ParseEntries(data)
      raw = {e[0]: e[1:] for e in entries}
      # Now expand out the facilities to services.
      facilities = {}
      for k, v in iteritems(raw):
        # Remove interactive tags.
        k = k.replace("<", "").replace(">", "")
        facilities[k] = v
      for k, vals in iteritems(facilities):
        self.insserv[k] = []
        for v in vals:
          self.insserv[k].extend(self._InsservExpander(facilities, v))
docs: /etc/insserv.conf* entries define system facilities.
  
      Full format details are in man 8 insserv, but the basic structure is:
        $variable          facility1 facility2
        $second_variable   facility3 $variable
  
      Any init script that specifies Required-Start: $second_variable needs to be
      expanded to facility1 facility2 facility3.
  
      Args:
        data: A string of insserv definitions.