Hot-fix admission of volumes that are being provisioned.

This is a first-aid bandage to let admission controller ignore persistent
volumes that are being provisioned right now and thus may not exist in
external cloud infrastructure yet.

pkg/volume/aws_ebs/aws_ebs.go

@@ -439,7 +439,7 @@ func (c *awsElasticBlockStoreProvisioner) NewPersistentVolumeTemplate() (*api.Pe
 			},
 			PersistentVolumeSource: api.PersistentVolumeSource{
 				AWSElasticBlockStore: &api.AWSElasticBlockStoreVolumeSource{
-					VolumeID:  "dummy",
+					VolumeID:  volume.ProvisionedVolumeName,
 					FSType:    "ext4",
 					Partition: 0,
 					ReadOnly:  false,

pkg/volume/cinder/cinder.go

@@ -445,7 +445,7 @@ func (c *cinderVolumeProvisioner) NewPersistentVolumeTemplate() (*api.Persistent
 			},
 			PersistentVolumeSource: api.PersistentVolumeSource{
 				Cinder: &api.CinderVolumeSource{
-					VolumeID: "dummy",
+					VolumeID: volume.ProvisionedVolumeName,
 					FSType:   "ext4",
 					ReadOnly: false,
 				},

pkg/volume/gce_pd/gce_pd.go

@@ -401,7 +401,7 @@ func (c *gcePersistentDiskProvisioner) NewPersistentVolumeTemplate() (*api.Persi
 			},
 			PersistentVolumeSource: api.PersistentVolumeSource{
 				GCEPersistentDisk: &api.GCEPersistentDiskVolumeSource{
-					PDName:    "dummy",
+					PDName:    volume.ProvisionedVolumeName,
 					FSType:    "ext4",
 					Partition: 0,
 					ReadOnly:  false,

pkg/volume/plugins.go

@@ -113,6 +113,12 @@ type DeletableVolumePlugin interface {
 	NewDeleter(spec *Spec) (Deleter, error)
 }
 
+const (
+	// Name of a volume in external cloud that is being provisioned and thus
+	// should be ignored by rest of Kubernetes.
+	ProvisionedVolumeName = "placeholder-for-provisioning"
+)
+
 // ProvisionableVolumePlugin is an extended interface of VolumePlugin and is used to create volumes for the cluster.
 type ProvisionableVolumePlugin interface {
 	VolumePlugin