Isolated content of pkg/kustomize

pkg/transformers/namehash.go

@@ -0,0 +1,104 @@
+/*
+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 (
+	"encoding/json"
+	"fmt"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/kubectl/pkg/kustomize/hash"
+	"k8s.io/kubectl/pkg/kustomize/resource"
+	"k8s.io/kubectl/pkg/kustomize/types"
+)
+
+// nameHashTransformer contains the prefix and the path config for each field that
+// the name prefix will be applied.
+type nameHashTransformer struct{}
+
+var _ Transformer = &nameHashTransformer{}
+
+// NewNameHashTransformer construct a nameHashTransformer.
+func NewNameHashTransformer() Transformer {
+	return &nameHashTransformer{}
+}
+
+// Transform appends hash to configmaps and secrets.
+func (o *nameHashTransformer) Transform(m resource.ResourceCollection) error {
+	for gvkn, obj := range m {
+		switch {
+		case types.SelectByGVK(gvkn.GVK, &schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"}):
+			appendHashForConfigMap(obj.Data)
+
+		case types.SelectByGVK(gvkn.GVK, &schema.GroupVersionKind{Version: "v1", Kind: "Secret"}):
+			appendHashForSecret(obj.Data)
+		}
+	}
+	return nil
+}
+
+func appendHashForConfigMap(obj *unstructured.Unstructured) error {
+	cm, err := unstructuredToConfigmap(obj)
+	if err != nil {
+		return err
+	}
+	h, err := hash.ConfigMapHash(cm)
+	if err != nil {
+		return err
+	}
+	nameWithHash := fmt.Sprintf("%s-%s", obj.GetName(), h)
+	obj.SetName(nameWithHash)
+	return nil
+}
+
+// TODO: Remove this function after we support hash unstructured objects
+func unstructuredToConfigmap(in *unstructured.Unstructured) (*v1.ConfigMap, error) {
+	marshaled, err := json.Marshal(in)
+	if err != nil {
+		return nil, err
+	}
+	var out v1.ConfigMap
+	err = json.Unmarshal(marshaled, &out)
+	return &out, err
+}
+
+func appendHashForSecret(obj *unstructured.Unstructured) error {
+	secret, err := unstructuredToSecret(obj)
+	if err != nil {
+		return err
+	}
+	h, err := hash.SecretHash(secret)
+	if err != nil {
+		return err
+	}
+	nameWithHash := fmt.Sprintf("%s-%s", obj.GetName(), h)
+	obj.SetName(nameWithHash)
+	return nil
+}
+
+// TODO: Remove this function after we support hash unstructured objects
+func unstructuredToSecret(in *unstructured.Unstructured) (*v1.Secret, error) {
+	marshaled, err := json.Marshal(in)
+	if err != nil {
+		return nil, err
+	}
+	var out v1.Secret
+	err = json.Unmarshal(marshaled, &out)
+	return &out, err
+}