add sandbox deletor to delete sandboxes on pod delete event

pkg/kubelet/container/runtime.go

@@ -114,6 +114,8 @@ type Runtime interface {
 	GetContainerLogs(ctx context.Context, pod *v1.Pod, containerID ContainerID, logOptions *v1.PodLogOptions, stdout, stderr io.Writer) (err error)
 	// Delete a container. If the container is still running, an error is returned.
 	DeleteContainer(containerID ContainerID) error
+	// Delete a sandbox. If the container is still running, an error is returned.
+	DeleteSandbox(sandboxID string) error
 	// ImageService provides methods to image-related methods.
 	ImageService
 	// UpdatePodCIDR sends a new podCIDR to the runtime.
@@ -308,6 +310,8 @@ type Status struct {
 	ID ContainerID
 	// Name of the container.
 	Name string
+	// ID of the sandbox to which this container belongs.
+	PodSandboxId string
 	// Status of the container.
 	State State
 	// Creation time of the container.

pkg/kubelet/container/testing/fake_runtime.go

@@ -364,6 +364,14 @@ func (f *FakeRuntime) DeleteContainer(containerID kubecontainer.ContainerID) err
 	return f.Err
 }
 
+func (f *FakeRuntime) DeleteSandbox(sandboxID string) error {
+	f.Lock()
+	defer f.Unlock()
+
+	f.CalledFunctions = append(f.CalledFunctions, "DeleteSandbox")
+	return f.Err
+}
+
 func (f *FakeRuntime) ImageStats() (*kubecontainer.ImageStats, error) {
 	f.Lock()
 	defer f.Unlock()

pkg/kubelet/container/testing/runtime_mock.go

@@ -147,6 +147,11 @@ func (r *Mock) DeleteContainer(containerID kubecontainer.ContainerID) error {
 	return args.Error(0)
 }
 
+func (r *Mock) DeleteSandbox(sandboxID string) error {
+	args := r.Called(sandboxID)
+	return args.Error(0)
+}
+
 func (r *Mock) ImageStats() (*kubecontainer.ImageStats, error) {
 	args := r.Called()
 	return args.Get(0).(*kubecontainer.ImageStats), args.Error(1)