Merge pull request kubernetes#31607 from jsafrane/describe-storageclass

Automatic merge from submit-queue

Add kubectl describe storageclass.

Sample output:

```
Name:		fast
Annotations:	storage.beta.kubernetes.io/default-class=true
Provisioner:	kubernetes.io/aws-ebs
Parameters:	type=gp2
No events.

Name:		slow
Annotations:	<none>
Provisioner:	kubernetes.io/aws-ebs
Parameters:	type=sc1
No events.
```
(it looks nicely aligned in terminal)

Proposing 1.4, it's bugfix, not a feature.

pkg/kubectl/describe.go

@@ -39,6 +39,7 @@ import (
 	"k8s.io/kubernetes/pkg/apis/batch"
 	"k8s.io/kubernetes/pkg/apis/certificates"
 	"k8s.io/kubernetes/pkg/apis/extensions"
+	"k8s.io/kubernetes/pkg/apis/storage"
 	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 	client "k8s.io/kubernetes/pkg/client/unversioned"
 	adapter "k8s.io/kubernetes/pkg/client/unversioned/adapters/internalclientset"
@@ -116,6 +117,7 @@ func describerMap(c *client.Client) map[unversioned.GroupKind]Describer {
 		batch.Kind("ScheduledJob"):                     &ScheduledJobDescriber{adapter.FromUnversionedClient(c)},
 		apps.Kind("PetSet"):                            &PetSetDescriber{c},
 		certificates.Kind("CertificateSigningRequest"): &CertificateSigningRequestDescriber{c},
+		storage.Kind("StorageClass"):                   &StorageClassDescriber{c},
 	}
 
 	return m
@@ -2385,6 +2387,33 @@ func describeNetworkPolicy(networkPolicy *extensions.NetworkPolicy) (string, err
 	})
 }
 
+type StorageClassDescriber struct {
+	client.Interface
+}
+
+func (s *StorageClassDescriber) Describe(namespace, name string, describerSettings DescriberSettings) (string, error) {
+	sc, err := s.Storage().StorageClasses().Get(name)
+	if err != nil {
+		return "", err
+	}
+	return tabbedString(func(out io.Writer) error {
+		fmt.Fprintf(out, "Name:\t%s\n", sc.Name)
+		fmt.Fprintf(out, "Annotations:\t%s\n", labels.FormatLabels(sc.Annotations))
+		fmt.Fprintf(out, "Provisioner:\t%s\n", sc.Provisioner)
+		fmt.Fprintf(out, "Parameters:\t%s\n", labels.FormatLabels(sc.Parameters))
+		if describerSettings.ShowEvents {
+			events, err := s.Events(namespace).Search(sc)
+			if err != nil {
+				return err
+			}
+			if events != nil {
+				DescribeEvents(events, out)
+			}
+		}
+		return nil
+	})
+}
+
 // newErrNoDescriber creates a new ErrNoDescriber with the names of the provided types.
 func newErrNoDescriber(types ...reflect.Type) error {
 	names := make([]string, 0, len(types))

pkg/kubectl/describe_test.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/resource"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/apis/extensions"
+	"k8s.io/kubernetes/pkg/apis/storage"
 	"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/fake"
 	client "k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/client/unversioned/testclient"
@@ -606,6 +607,31 @@ func TestDescribeCluster(t *testing.T) {
 	}
 }
 
+func TestDescribeStorageClass(t *testing.T) {
+	f := testclient.NewSimpleFake(&storage.StorageClass{
+		ObjectMeta: api.ObjectMeta{
+			Name:            "foo",
+			ResourceVersion: "4",
+			Annotations: map[string]string{
+				"name": "foo",
+			},
+		},
+		Provisioner: "my-provisioner",
+		Parameters: map[string]string{
+			"param1": "value1",
+			"param2": "value2",
+		},
+	})
+	s := StorageClassDescriber{f}
+	out, err := s.Describe("", "foo", DescriberSettings{ShowEvents: true})
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if !strings.Contains(out, "foo") {
+		t.Errorf("unexpected out: %s", out)
+	}
+}
+
 func TestDescribeEvents(t *testing.T) {
 
 	events := &api.EventList{
@@ -704,6 +730,14 @@ func TestDescribeEvents(t *testing.T) {
 				},
 			}, events),
 		},
+		"StorageClass": &StorageClassDescriber{
+			testclient.NewSimpleFake(&storage.StorageClass{
+				ObjectMeta: api.ObjectMeta{
+					Name:      "bar",
+					Namespace: "foo",
+				},
+			}, events),
+		},
 	}
 
 	for name, d := range m {