code: def login(self, username, password, email, url, config_path):
          
          if username and password:
              try:
                  self.client.login(username=username, password=password, email=email,
                                    registry=url, reauth=True)
              except docker_errors.APIError as exc:
                  raise exceptions.AnsibleContainerConductorException(
                      u"Error logging into registry: {}".format(exc)
                  )
              except Exception:
                  raise
  
              self._update_config_file(username, password, email, url, config_path)
  
          username, password = self._get_registry_auth(url, config_path)
          if not username:
              raise exceptions.AnsibleContainerConductorException(
                  u'Please provide login credentials for registry {}.'.format(url))
          return username, password
docs: If username and password are provided, authenticate with the registry.
          Otherwise, check the config file for existing authentication data.