working commit

vendor/k8s.io/cli-runtime/pkg/printers/managedfields.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package printers
+
+import (
+	"io"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+)
+
+// OmitManagedFieldsPrinter wraps an existing printer and omits the managed fields from the object
+// before printing it.
+type OmitManagedFieldsPrinter struct {
+	Delegate ResourcePrinter
+}
+
+var _ ResourcePrinter = (*OmitManagedFieldsPrinter)(nil)
+
+func omitManagedFields(o runtime.Object) runtime.Object {
+	a, err := meta.Accessor(o)
+	if err != nil {
+		// The object is not a `metav1.Object`, ignore it.
+		return o
+	}
+	a.SetManagedFields(nil)
+	return o
+}
+
+// PrintObj copies the object and omits the managed fields from the copied object before printing it.
+func (p *OmitManagedFieldsPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
+	if obj == nil {
+		return p.Delegate.PrintObj(obj, w)
+	}
+	if meta.IsListType(obj) {
+		obj = obj.DeepCopyObject()
+		_ = meta.EachListItem(obj, func(item runtime.Object) error {
+			omitManagedFields(item)
+			return nil
+		})
+	} else if _, err := meta.Accessor(obj); err == nil {
+		obj = omitManagedFields(obj.DeepCopyObject())
+	}
+	return p.Delegate.PrintObj(obj, w)
+}