make it possible to move SchemeBuilder with zz_generated.deepcopy.go

pkg/apis/abac/v0/register.go

@@ -40,10 +40,20 @@ func init() {
 }
 
 var (
-	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes, addConversionFuncs)
-	AddToScheme   = SchemeBuilder.AddToScheme
+	// TODO: move SchemeBuilder with zz_generated.deepcopy.go to k8s.io/api.
+	// localSchemeBuilder and AddToScheme will stay in k8s.io/kubernetes.
+	SchemeBuilder      runtime.SchemeBuilder
+	localSchemeBuilder = &SchemeBuilder
+	AddToScheme        = localSchemeBuilder.AddToScheme
 )
 
+func init() {
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes, addConversionFuncs)
+}
+
 func addKnownTypes(scheme *runtime.Scheme) error {
 	scheme.AddKnownTypes(SchemeGroupVersion,
 		&Policy{},