add support for Cinder volumes in PersistentVolumeLabel admission controller

plugin/pkg/admission/storage/persistentvolume/label/admission.go

@@ -70,9 +70,9 @@ var _ kubeapiserveradmission.WantsCloudConfig = &persistentVolumeLabel{}
 //
 // As a side effect, the cloud provider may block invalid or non-existent volumes.
 func newPersistentVolumeLabel() *persistentVolumeLabel {
-	// DEPRECATED: cloud-controller-manager will now start NewPersistentVolumeLabelController
-	// which does exactly what this admission controller used to do. So once GCE, AWS and AZURE can
-	// run externally, we can remove this admission controller.
+	// DEPRECATED: in a future release, we will use mutating admission webhooks to apply PV labels.
+	// Once the mutating admission webhook is used for AWS, Azure, GCE, and OpenStack,
+	// this admission controller will be removed.
 	klog.Warning("PersistentVolumeLabel admission controller is deprecated. " +
 		"Please remove this controller from your configuration files and scripts.")
 	return &persistentVolumeLabel{
@@ -132,6 +132,13 @@ func (l *persistentVolumeLabel) Admit(a admission.Attributes) (err error) {
 		}
 		volumeLabels = labels
 	}
+	if volume.Spec.Cinder != nil {
+		labels, err := l.findCinderDiskLabels(volume)
+		if err != nil {
+			return admission.NewForbidden(a, fmt.Errorf("error querying Cinder volume %s: %v", volume.Spec.Cinder.VolumeID, err))
+		}
+		volumeLabels = labels
+	}
 
 	requirements := make([]api.NodeSelectorRequirement, 0)
 	if len(volumeLabels) != 0 {
@@ -327,3 +334,53 @@ func (l *persistentVolumeLabel) findAzureDiskLabels(volume *api.PersistentVolume
 	}
 	return pvlabler.GetLabelsForVolume(context.TODO(), pv)
 }
+
+func (l *persistentVolumeLabel) getOpenStackPVLabeler() (cloudprovider.PVLabeler, error) {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+
+	if l.openStackPVLabeler == nil {
+		var cloudConfigReader io.Reader
+		if len(l.cloudConfig) > 0 {
+			cloudConfigReader = bytes.NewReader(l.cloudConfig)
+		}
+
+		cloudProvider, err := cloudprovider.GetCloudProvider("openstack", cloudConfigReader)
+		if err != nil || cloudProvider == nil {
+			return nil, err
+		}
+
+		openStackPVLabeler, ok := cloudProvider.(cloudprovider.PVLabeler)
+		if !ok {
+			return nil, errors.New("OpenStack cloud provider does not implement PV labeling")
+		}
+
+		l.openStackPVLabeler = openStackPVLabeler
+	}
+
+	return l.openStackPVLabeler, nil
+
+}
+
+func (l *persistentVolumeLabel) findCinderDiskLabels(volume *api.PersistentVolume) (map[string]string, error) {
+	// Ignore any volumes that are being provisioned
+	if volume.Spec.Cinder.VolumeID == vol.ProvisionedVolumeName {
+		return nil, nil
+	}
+
+	pvlabler, err := l.getOpenStackPVLabeler()
+	if err != nil {
+		return nil, err
+	}
+	if pvlabler == nil {
+		return nil, fmt.Errorf("unable to build OpenStack cloud provider for Cinder disk")
+	}
+
+	pv := &v1.PersistentVolume{}
+	err = k8s_api_v1.Convert_core_PersistentVolume_To_v1_PersistentVolume(volume, pv, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert PersistentVolume to core/v1: %q", err)
+	}
+	return pvlabler.GetLabelsForVolume(context.TODO(), pv)
+
+}