code: def login(self, **kwargs):
          
          c_user = kwargs.pop('username', env.get('docker_registry_user'))
          c_pass = kwargs.pop('password', env.get('docker_registry_password'))
          c_mail = kwargs.pop('email', env.get('docker_registry_mail'))
          c_registry = kwargs.pop('registry', env.get('docker_registry_repository'))
          c_insecure = kwargs.pop('insecure_registry', env.get('docker_registry_insecure'))
          if super(DockerFabricClient, self).login(c_user, password=c_pass, email=c_mail, registry=c_registry,
                                                   insecure_registry=c_insecure, **kwargs):
              self.push_log("Login at registry '{0}' succeeded.".format(c_registry))
              return True
          self.push_log("Login at registry '{0}' failed.".format(c_registry))
          return False
docs: Identical to :meth:`dockermap.client.base.DockerClientWrapper.login` with two enhancements:
  
          * additional logging;
          * login parameters can be passed through ``kwargs``, or set as default using the following ``env``
            variables:
  
            * ``env.docker_registry_user`` (kwarg: ``username``),
            * ``env.docker_registry_password`` (kwarg: ``password``),
            * ``env.docker_registry_mail`` (kwarg: ``email``),
            * ``env.docker_registry_repository`` (kwarg: ``registry``),
            * ``env.docker_registry_insecure`` (kwarg: ``insecure_registry``).