"runtimeHandler": "runtimeHandler specifies the underlying runtime and configuration that the CRI implementation will use to handle pods of this class. The possible values are specific to the node & CRI configuration.  It is assumed that all handlers are available on...

        "time": "2004-01-01T01:01:01Z",
        "fieldsType": "fieldsTypeValue",
        "fieldsV1": {},
        "subresource": "subresourceValue"
      }
    ]
  },
  "spec": {
    "runtimeHandler": "runtimeHandlerValue",
    "overhead": {
      "podFixed": {
        "podFixedKey": "0"
      }
    },
    "scheduling": {
      "nodeSelector": {
        "nodeSelectorKey": "nodeSelectorValue"
      },

    kind: kindValue
    name: nameValue
    uid: uidValue
  resourceVersion: resourceVersionValue
  selfLink: selfLinkValue
  uid: uidValue
spec:
  overhead:
    podFixed:
      podFixedKey: "0"
  runtimeHandler: runtimeHandlerValue
  scheduling:
    nodeSelector:
      nodeSelectorKey: nodeSelectorValue
    tolerations:
    - effect: effectValue
      key: keyValue
      operator: operatorValue

	c := &runtimeapi.Container{
		Id: "test-id",
		Metadata: &runtimeapi.ContainerMetadata{
			Name:    "test-name",
			Attempt: 1,
		},
		Image:    &runtimeapi.ImageSpec{Image: "test-image", RuntimeHandler: "test-runtimeHandler"},
		ImageId:  "test-image-id",
		ImageRef: "test-image-ref",
		State:    runtimeapi.ContainerState_CONTAINER_RUNNING,
		Annotations: map[string]string{
			containerHashLabel: "1234",
		},
	}

			Message: c.Message,
		})
	}
	retHandlers := make([]kubecontainer.RuntimeHandler, len(handlers))
	for i, h := range handlers {
		supportsRRO := false
		supportsUserns := false
		if h.Features != nil {
			supportsRRO = h.Features.RecursiveReadOnlyMounts
			supportsUserns = h.Features.UserNamespaces
		}
		retHandlers[i] = kubecontainer.RuntimeHandler{
			Name:                            h.Name,

// purposes.
func (m *Manager) WaitForCacheSync(stopCh <-chan struct{}) {
	m.informerFactory.WaitForCacheSync(stopCh)
}

// LookupRuntimeHandler returns the RuntimeHandler string associated with the given RuntimeClass
// name (or the default of "" for nil). If the RuntimeClass is not found, it returns an
// errors.NotFound error.

	if handlerSupportsUserns, err := m.kl.HandlerSupportsUserNamespaces(runtimeHandler); err != nil {
		return nil, err
	} else if !handlerSupportsUserns {
		return nil, fmt.Errorf("RuntimeClass handler %q does not support user namespaces", runtimeHandler)
	}

	m.lock.Lock()
	defer m.lock.Unlock()

	content, err := m.readMappingsFromFile(pod.UID)

				return 0, err
			}
			i -= size
			i = encodeVarintGenerated(dAtA, i, uint64(size))
		}
		i--
		dAtA[i] = 0x12
	}
	i -= len(m.RuntimeHandler)
	copy(dAtA[i:], m.RuntimeHandler)
	i = encodeVarintGenerated(dAtA, i, uint64(len(m.RuntimeHandler)))
	i--
	dAtA[i] = 0xa
	return len(dAtA) - i, nil
}

func (m *Scheduling) Marshal() (dAtA []byte, err error) {
	size := m.Size()

	return "/poddir/" + string(podUID)
}

func (f *FakeRuntimeHelper) GetExtraSupplementalGroupsForPod(pod *v1.Pod) []int64 {
	return nil
}

func (f *FakeRuntimeHelper) GetOrCreateUserNamespaceMappings(pod *v1.Pod, runtimeHandler string) (*runtimeapi.UserNamespace, error) {
	return nil, nil
}

func (f *FakeRuntimeHelper) PrepareDynamicResources(pod *v1.Pod) error {
	return nil
}

	testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
	defer testKubelet.Cleanup()
	kubelet := testKubelet.kubelet

	kubelet.runtimeState.setRuntimeHandlers([]kubecontainer.RuntimeHandler{
		{
			Name:                   "has-support",
			SupportsUserNamespaces: true,
		},
		{
			Name:                   "has-no-support",
			SupportsUserNamespaces: false,
		},
	})