admission plugins: simplify deepcopy calls

plugin/pkg/admission/podpreset/admission_test.go

@@ -729,12 +729,8 @@ func TestExclusionNoAdmit(t *testing.T) {
 			},
 		},
 	}
-	originalPod, err := api.Scheme.Copy(pod)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = admitPod(pod, pip)
+	originalPod := pod.DeepCopy()
+	err := admitPod(pod, pip)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -797,12 +793,8 @@ func TestAdmitEmptyPodNamespace(t *testing.T) {
 			},
 		},
 	}
-	originalPod, err := api.Scheme.Copy(pod)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = admitPod(pod, pip)
+	originalPod := pod.DeepCopy()
+	err := admitPod(pod, pip)
 	if err != nil {
 		t.Fatal(err)
 	}

plugin/pkg/admission/resourcequota/controller.go

@@ -320,11 +320,7 @@ func (e *quotaEvaluator) checkQuotas(quotas []api.ResourceQuota, admissionAttrib
 func copyQuotas(in []api.ResourceQuota) ([]api.ResourceQuota, error) {
 	out := make([]api.ResourceQuota, 0, len(in))
 	for _, quota := range in {
-		copied, err := api.Scheme.Copy(&quota)
-		if err != nil {
-			return nil, err
-		}
-		out = append(out, *copied.(*api.ResourceQuota))
+		out = append(out, *quota.DeepCopy())
 	}
 
 	return out, nil

plugin/pkg/admission/storageclass/setdefault/admission_test.go

@@ -191,11 +191,7 @@ func TestAdmission(t *testing.T) {
 		glog.V(4).Infof("starting test %q", test.name)
 
 		// clone the claim, it's going to be modified
-		clone, err := api.Scheme.DeepCopy(test.claim)
-		if err != nil {
-			t.Fatalf("Cannot clone claim: %v", err)
-		}
-		claim := clone.(*api.PersistentVolumeClaim)
+		claim := test.claim.DeepCopy()
 
 		ctrl := newPlugin()
 		informerFactory := informers.NewSharedInformerFactory(nil, controller.NoResyncPeriodFunc())
@@ -214,7 +210,7 @@ func TestAdmission(t *testing.T) {
 			admission.Create,
 			nil, // userInfo
 		)
-		err = ctrl.Admit(attrs)
+		err := ctrl.Admit(attrs)
 		glog.Infof("Got %v", err)
 		if err != nil && !test.expectError {
 			t.Errorf("Test %q: unexpected error received: %v", test.name, err)