// Implementations are expected to abstract the underlying runtimes.
// Implementations are expected to be thread safe.
type ImageManager interface {
	// EnsureImageExists ensures that image specified in `container` exists.
	EnsureImageExists(ctx context.Context, pod *v1.Pod, container *v1.Container, pullSecrets []v1.Secret, podSandboxConfig *runtimeapi.PodSandboxConfig, podRuntimeHandler string) (string, string, error)

	if ref != nil {
		m.recorder.Event(ref, eventtype, event, msg)
	} else {
		logFn(fmt.Sprint(prefix, " ", msg))
	}
}

// EnsureImageExists pulls the image for the specified pod and container, and returns
// (imageRef, error message, error).