docs: def set_uid(self):
          """Change the user of the running process"""
          if self.user:
              uid = getpwnam(self.user).pw_uid
              try:
                  os.setuid(uid)
              except Exception:
                  message = ('Unable to switch ownership to {0}:{1}. ' +
                             'Did you start the daemon as root?')
                  print(message.format(self.user, self.group))
                  sys.exit(1)