// same as above func comments, except 'recyclerClient' is a narrower pod API // interface to ease testing func internalRecycleVolumeByWatchingPodUntilCompletion(pvName string, pod *api.Pod, recyclerClient recyclerClient) error { glog.V(5).Infof("creating recycler pod for volume %s\n", pod.Name) // Generate unique name for the recycler pod - we need to get "already // exists" error when a previous controller has already started recycling // the volume. Here we assume that pv.Name is already unique. pod.Name = "recycler-for-" + pvName pod.GenerateName = "" // Start the pod _, err := recyclerClient.CreatePod(pod) if err != nil { if errors.IsAlreadyExists(err) { glog.V(5).Infof("old recycler pod %q found for volume", pod.Name) } else { return fmt.Errorf("Unexpected error creating recycler pod: %+v\n", err) } } defer recyclerClient.DeletePod(pod.Name, pod.Namespace) // Now only the old pod or the new pod run. Watch it until it finishes. stopChannel := make(chan struct{}) defer close(stopChannel) nextPod := recyclerClient.WatchPod(pod.Name, pod.Namespace, stopChannel) for { watchedPod := nextPod() if watchedPod.Status.Phase == api.PodSucceeded { // volume.Recycle() returns nil on success, else error return nil } if watchedPod.Status.Phase == api.PodFailed { // volume.Recycle() returns nil on success, else error if watchedPod.Status.Message != "" { return fmt.Errorf(watchedPod.Status.Message) } else { return fmt.Errorf("pod failed, pod.Status.Message unknown.") } } } }