Isolated content of pkg/kustomize

pkg/transformers/prefixname.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"errors"
+	"fmt"
+
+	"k8s.io/kubectl/pkg/kustomize/resource"
+	"k8s.io/kubectl/pkg/kustomize/types"
+)
+
+// namePrefixTransformer contains the prefix and the path config for each field that
+// the name prefix will be applied.
+type namePrefixTransformer struct {
+	prefix      string
+	pathConfigs []PathConfig
+}
+
+var _ Transformer = &namePrefixTransformer{}
+
+var defaultNamePrefixPathConfigs = []PathConfig{
+	{
+		Path:               []string{"metadata", "name"},
+		CreateIfNotPresent: false,
+	},
+}
+
+// NewDefaultingNamePrefixTransformer construct a namePrefixTransformer with defaultNamePrefixPathConfigs.
+func NewDefaultingNamePrefixTransformer(nameprefix string) (Transformer, error) {
+	return NewNamePrefixTransformer(defaultNamePrefixPathConfigs, nameprefix)
+}
+
+// NewNamePrefixTransformer construct a namePrefixTransformer.
+func NewNamePrefixTransformer(pc []PathConfig, np string) (Transformer, error) {
+	if len(np) == 0 {
+		return NewNoOpTransformer(), nil
+	}
+	if pc == nil {
+		return nil, errors.New("pathConfigs is not expected to be nil")
+	}
+	return &namePrefixTransformer{pathConfigs: pc, prefix: np}, nil
+}
+
+// Transform prepends the name prefix.
+func (o *namePrefixTransformer) Transform(m resource.ResourceCollection) error {
+	for gvkn := range m {
+		obj := m[gvkn].Data
+		objMap := obj.UnstructuredContent()
+		for _, path := range o.pathConfigs {
+			if !types.SelectByGVK(gvkn.GVK, path.GroupVersionKind) {
+				continue
+			}
+			err := mutateField(objMap, path.Path, path.CreateIfNotPresent, o.addPrefix)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (o *namePrefixTransformer) addPrefix(in interface{}) (interface{}, error) {
+	s, ok := in.(string)
+	if !ok {
+		return nil, fmt.Errorf("%#v is expectd to be %T", in, s)
+	}
+	return o.prefix + s, nil
+}