Merge pull request #54463 from saad-ali/volumeAttachmentAPI

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Introduce new `VolumeAttachment` API Object

**What this PR does / why we need it**:

Introduce a new `VolumeAttachment` API Object. This object will be used by the CSI volume plugin to enable external attachers (see design [here](https://github.com/kubernetes/community/pull/1258). In the future, existing volume plugins can be refactored to use this object as well.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:  Part of issue https://github.com/kubernetes/features/issues/178

**Special notes for your reviewer**:
None

**Release note**:

```release-note
NONE
```

Kubernetes-commit: ebe8ea73fd1a961779242dfbb629befa153e96fc

vendor/k8s.io/client-go/informers/batch/v2alpha1/cronjob.go

@@ -38,19 +38,34 @@ type CronJobInformer interface {
 }
 
 type cronJobInformer struct {
-	factory internalinterfaces.SharedInformerFactory
+	factory          internalinterfaces.SharedInformerFactory
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+	namespace        string
 }
 
 // NewCronJobInformer constructs a new informer for CronJob type.
 // Always prefer using an informer factory to get a shared informer instead of getting an independent
 // one. This reduces memory footprint and number of connections to the server.
 func NewCronJobInformer(client kubernetes.Interface, namespace string, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
+	return NewFilteredCronJobInformer(client, namespace, resyncPeriod, indexers, nil)
+}
+
+// NewFilteredCronJobInformer constructs a new informer for CronJob type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewFilteredCronJobInformer(client kubernetes.Interface, namespace string, resyncPeriod time.Duration, indexers cache.Indexers, tweakListOptions internalinterfaces.TweakListOptionsFunc) cache.SharedIndexInformer {
 	return cache.NewSharedIndexInformer(
 		&cache.ListWatch{
 			ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
 				return client.BatchV2alpha1().CronJobs(namespace).List(options)
 			},
 			WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
 				return client.BatchV2alpha1().CronJobs(namespace).Watch(options)
 			},
 		},
@@ -60,12 +75,12 @@ func NewCronJobInformer(client kubernetes.Interface, namespace string, resyncPer
 	)
 }
 
-func defaultCronJobInformer(client kubernetes.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {
-	return NewCronJobInformer(client, v1.NamespaceAll, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
+func (f *cronJobInformer) defaultInformer(client kubernetes.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {
+	return NewFilteredCronJobInformer(client, f.namespace, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, f.tweakListOptions)
 }
 
 func (f *cronJobInformer) Informer() cache.SharedIndexInformer {
-	return f.factory.InformerFor(&batch_v2alpha1.CronJob{}, defaultCronJobInformer)
+	return f.factory.InformerFor(&batch_v2alpha1.CronJob{}, f.defaultInformer)
 }
 
 func (f *cronJobInformer) Lister() v2alpha1.CronJobLister {

vendor/k8s.io/client-go/informers/batch/v2alpha1/interface.go

@@ -29,15 +29,17 @@ type Interface interface {
 }
 
 type version struct {
-	internalinterfaces.SharedInformerFactory
+	factory          internalinterfaces.SharedInformerFactory
+	namespace        string
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
 }
 
 // New returns a new Interface.
-func New(f internalinterfaces.SharedInformerFactory) Interface {
-	return &version{f}
+func New(f internalinterfaces.SharedInformerFactory, namespace string, tweakListOptions internalinterfaces.TweakListOptionsFunc) Interface {
+	return &version{factory: f, namespace: namespace, tweakListOptions: tweakListOptions}
 }
 
 // CronJobs returns a CronJobInformer.
 func (v *version) CronJobs() CronJobInformer {
-	return &cronJobInformer{factory: v.SharedInformerFactory}
+	return &cronJobInformer{factory: v.factory, namespace: v.namespace, tweakListOptions: v.tweakListOptions}
 }