Add support for labelling 3rd party objects

pkg/kubectl/cmd/util/helpers.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/meta"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/apimachinery/registered"
+	"k8s.io/kubernetes/pkg/apis/extensions"
 	"k8s.io/kubernetes/pkg/client/typed/discovery"
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	"k8s.io/kubernetes/pkg/kubectl"
@@ -594,3 +595,15 @@ func ParsePairs(pairArgs []string, pairType string, supportRemove bool) (newPair
 
 	return
 }
+
+// MaybeConvertObject attempts to convert an object to a specific group/version.  If the object is
+// a third party resource it is simply passed through.
+func MaybeConvertObject(obj runtime.Object, gv unversioned.GroupVersion, converter runtime.ObjectConvertor) (runtime.Object, error) {
+	switch obj.(type) {
+	case *extensions.ThirdPartyResourceData:
+		// conversion is not supported for 3rd party objects
+		return obj, nil
+	default:
+		return converter.ConvertToVersion(obj, gv)
+	}
+}