use traditional controller tool to generate code

vendor/sigs.k8s.io/controller-tools/pkg/util/util.go

@@ -0,0 +1,77 @@
+/*
+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 util
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/afero"
+)
+
+// FileWriter is a io wrapper to write files
+type FileWriter struct {
+	Fs afero.Fs
+}
+
+// WriteCloser returns a WriteCloser to write to given path
+func (fw *FileWriter) WriteCloser(path string) (io.Writer, error) {
+	if fw.Fs == nil {
+		fw.Fs = afero.NewOsFs()
+	}
+	dir := filepath.Dir(path)
+	err := fw.Fs.MkdirAll(dir, 0700)
+	if err != nil {
+		return nil, err
+	}
+
+	fi, err := fw.Fs.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return nil, err
+	}
+
+	return fi, nil
+}
+
+// WriteFile write given content to the file path
+func (fw *FileWriter) WriteFile(filePath string, content []byte) error {
+	if fw.Fs == nil {
+		fw.Fs = afero.NewOsFs()
+	}
+	f, err := fw.WriteCloser(filePath)
+	if err != nil {
+		return fmt.Errorf("failed to create %s: %v", filePath, err)
+	}
+
+	if c, ok := f.(io.Closer); ok {
+		defer func() {
+			if err := c.Close(); err != nil {
+				log.Fatal(err)
+			}
+		}()
+	}
+
+	_, err = f.Write(content)
+	if err != nil {
+		return fmt.Errorf("failed to write %s: %v", filePath, err)
+	}
+
+	return nil
+}