Isolated content of pkg/kustomize

pkg/commands/util.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 commands
+
+import (
+	"errors"
+	"fmt"
+	"path"
+	"strings"
+
+	"github.com/ghodss/yaml"
+
+	"k8s.io/kubectl/pkg/kustomize/constants"
+	interror "k8s.io/kubectl/pkg/kustomize/internal/error"
+	"k8s.io/kubectl/pkg/kustomize/types"
+	"k8s.io/kubectl/pkg/kustomize/util/fs"
+)
+
+type kustomizationFile struct {
+	path string
+	fsys fs.FileSystem
+}
+
+func newKustomizationFile(mPath string, fsys fs.FileSystem) (*kustomizationFile, error) {
+	mf := &kustomizationFile{path: mPath, fsys: fsys}
+	err := mf.validate()
+	if err != nil {
+		return nil, err
+	}
+	return mf, nil
+}
+
+func (mf *kustomizationFile) validate() error {
+	f, err := mf.fsys.Stat(mf.path)
+	if err != nil {
+		errorMsg := fmt.Sprintf("Missing kustomization file '%s'.\n", mf.path)
+		merr := interror.KustomizationError{KustomizationPath: mf.path, ErrorMsg: errorMsg}
+		return merr
+	}
+	if f.IsDir() {
+		mf.path = path.Join(mf.path, constants.KustomizationFileName)
+		_, err = mf.fsys.Stat(mf.path)
+		if err != nil {
+			errorMsg := fmt.Sprintf("Missing kustomization file '%s'.\n", mf.path)
+			merr := interror.KustomizationError{KustomizationPath: mf.path, ErrorMsg: errorMsg}
+			return merr
+		}
+	} else {
+		if !strings.HasSuffix(mf.path, constants.KustomizationFileName) {
+			errorMsg := fmt.Sprintf("Kustomization file path (%s) should have %s suffix\n", mf.path, constants.KustomizationSuffix)
+			merr := interror.KustomizationError{KustomizationPath: mf.path, ErrorMsg: errorMsg}
+			return merr
+		}
+	}
+	return nil
+}
+
+func (mf *kustomizationFile) read() (*types.Kustomization, error) {
+	bytes, err := mf.fsys.ReadFile(mf.path)
+	if err != nil {
+		return nil, err
+	}
+	var kustomization types.Kustomization
+	err = yaml.Unmarshal(bytes, &kustomization)
+	if err != nil {
+		return nil, err
+	}
+	return &kustomization, err
+}
+
+func (mf *kustomizationFile) write(kustomization *types.Kustomization) error {
+	if kustomization == nil {
+		return errors.New("util: kustomization file arg is nil.")
+	}
+	bytes, err := yaml.Marshal(kustomization)
+	if err != nil {
+		return err
+	}
+
+	return mf.fsys.WriteFile(mf.path, bytes)
+}
+
+func stringInSlice(str string, list []string) bool {
+	for _, v := range list {
+		if v == str {
+			return true
+		}
+	}
+	return false
+}