apimachinery: simplify deepcopy calls

staging/src/k8s.io/apimachinery/pkg/api/testing/roundtrip/roundtrip.go

@@ -19,7 +19,6 @@ package roundtrip
 import (
 	"bytes"
 	"encoding/hex"
-	"fmt"
 	"math/rand"
 	"reflect"
 	"strings"
@@ -269,11 +268,7 @@ func roundTrip(t *testing.T, scheme *runtime.Scheme, codec runtime.Codec, object
 	original := object
 
 	// deep copy the original object
-	copied, err := scheme.DeepCopy(object)
+	object = object.DeepCopyObject()
-	if err != nil {
-		panic(fmt.Sprintf("unable to copy: %v", err))
-	}
-	object = copied.(runtime.Object)
 	name := reflect.TypeOf(object).Elem().Name()
 
 	// catch deepcopy errors early

staging/src/k8s.io/apimachinery/pkg/runtime/embedded_test.go

@@ -243,12 +243,8 @@ func TestDeepCopyOfRuntimeObject(t *testing.T) {
 	}
 	t.Logf("originalRole = %v\n", string(originalData))
 
-	copyOfOriginal, err := s.DeepCopy(original)
+	copyOfOriginal := original.DeepCopy()
-	if err != nil {
+	copiedData, err := runtime.Encode(codec, copyOfOriginal)
-		t.Fatalf("unexpected error: %v", err)
-	}
-
-	copiedData, err := runtime.Encode(codec, copyOfOriginal.(runtime.Object))
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}

staging/src/k8s.io/apimachinery/pkg/runtime/scheme.go

@@ -530,11 +530,7 @@ func (s *Scheme) convertToVersion(copy bool, in Object, target GroupVersioner) (
 	}
 
 	if copy {
-		copied, err := s.Copy(in)
+		in = in.DeepCopyObject()
-		if err != nil {
-			return nil, err
-		}
-		in = copied
 	}
 
 	flags, meta := s.generateConvertMeta(in)
@@ -555,11 +551,7 @@ func (s *Scheme) generateConvertMeta(in interface{}) (conversion.FieldMatchingFl
 // copyAndSetTargetKind performs a conditional copy before returning the object, or an error if copy was not successful.
 func copyAndSetTargetKind(copy bool, copier ObjectCopier, obj Object, kind schema.GroupVersionKind) (Object, error) {
 	if copy {
-		copied, err := copier.Copy(obj)
+		obj = obj.DeepCopyObject()
-		if err != nil {
-			return nil, err
-		}
-		obj = copied
 	}
 	setTargetKind(obj, kind)
 	return obj, nil

staging/src/k8s.io/apimachinery/pkg/runtime/scheme_test.go

@@ -711,7 +711,7 @@ func TestConvertToVersion(t *testing.T) {
 		},
 	}
 	for i, test := range testCases {
-		original, _ := test.scheme.DeepCopy(test.in)
+		original := test.in.DeepCopyObject()
 		out, err := test.scheme.ConvertToVersion(test.in, test.gv)
 		switch {
 		case test.errFn != nil: