Merge pull request #7532 from vmarmol/runtime-images

Add image-related methods to Runtime interface.

pkg/kubelet/container/runtime.go

@@ -74,6 +74,10 @@ type Runtime interface {
 	PullImage(image string) error
 	// IsImagePresent checks whether the container image is already in the local storage.
 	IsImagePresent(image string) (bool, error)
+	// Gets all images currently on the machine.
+	ListImages() ([]Image, error)
+	// Removes the specified image.
+	RemoveImage(image string) error
 	// GetContainerLogs returns logs of a specific container. By
 	// default, it returns a snapshot of the container log. Set 'follow' to true to
 	// stream the log. Set 'follow' to false and specify the number of lines (e.g.
@@ -164,6 +168,16 @@ type Container struct {
 	Created int64
 }
 
+// Basic information about a container image.
+type Image struct {
+	// ID of the image.
+	ID string
+	// Other names by which this image is known.
+	Tags []string
+	// The size of the image in bytes.
+	Size int64
+}
+
 // RunContainerOptions specify the options which are necessary for running containers
 type RunContainerOptions struct {
 	// The environment variables, they are in the form of 'key=value'.