code: def whisper_lock_writes(self, cluster='main'):
          
          if not self.config.has_section(cluster):
              raise SystemExit("Cluster '%s' not defined in %s"
                               % (cluster, self.config_file))
          try:
              return bool(self.config.get(cluster, 'whisper_lock_writes'))
          except NoOptionError:
              return False
docs: Lock whisper files during carbon-sync.