docs: def log_root(self):
          """
          Find a directory suitable for writing log files. It uses sys.prefix
          to use a path relative to the root. If sys.prefix is /usr, it's the
          system Python, so use /var/log.
          """
          var_log = (
              os.path.join(sys.prefix, 'var', 'log')
              .replace('/usr/var', '/var')
          )
          if not os.path.isdir(var_log):
              os.makedirs(var_log)
          return var_log