Delete corresponding Devices when deleting Images

If an image is deleted and there is a corresponding device
for that image we also delete the image.

runtime.go

@@ -291,6 +291,19 @@ func (runtime *Runtime) Destroy(container *Container) error {
 	return nil
 }
 
+func (runtime *Runtime) DeleteImage(id string) error {
+	err := runtime.graph.Delete(id)
+	if err != nil {
+		return err
+	}
+	if runtime.GetMountMethod() == MountMethodDeviceMapper && runtime.deviceSet.HasDevice(id) {
+		if err := runtime.deviceSet.RemoveDevice(id); err != nil {
+			return fmt.Errorf("Unable to remove device for %v: %v", id, err)
+		}
+	}
+	return nil
+}
+
 func (runtime *Runtime) restore() error {
 	wheel := "-\\|/"
 	if os.Getenv("DEBUG") == "" && os.Getenv("TEST") == "" {

runtime_test.go

@@ -57,7 +57,7 @@ func cleanup(runtime *Runtime) error {
 	}
 	for _, image := range images {
 		if image.ID != unitTestImageID {
-			runtime.graph.Delete(image.ID)
+			runtime.DeleteImage(image.ID)
 		}
 	}
 	return nil

server.go

@@ -1025,7 +1025,7 @@ func (srv *Server) deleteImageAndChildren(id string, imgs *[]APIRmi) error {
 		if err := srv.runtime.repositories.DeleteAll(id); err != nil {
 			return err
 		}
-		err := srv.runtime.graph.Delete(id)
+		err := srv.runtime.DeleteImage(id)
 		if err != nil {
 			return err
 		}
@@ -1099,7 +1099,7 @@ func (srv *Server) ImageDelete(name string, autoPrune bool) ([]APIRmi, error) {
 		return nil, fmt.Errorf("No such image: %s", name)
 	}
 	if !autoPrune {
-		if err := srv.runtime.graph.Delete(img.ID); err != nil {
+		if err := srv.runtime.DeleteImage(img.ID); err != nil {
 			return nil, fmt.Errorf("Error deleting image %s: %s", name, err)
 		}
 		return nil, nil