use traditional controller tool to generate code

vendor/sigs.k8s.io/controller-tools/pkg/webhook/writer.go

@@ -0,0 +1,92 @@
+package webhook
+
+import (
+	"bytes"
+	"fmt"
+	"path"
+	"path/filepath"
+
+	"github.com/ghodss/yaml"
+	"github.com/spf13/afero"
+
+	"k8s.io/apimachinery/pkg/runtime"
+)
+
+// WriterOptions specifies the input and output.
+type WriterOptions struct {
+	InputDir       string
+	OutputDir      string
+	PatchOutputDir string
+
+	// inFs is filesystem to be used for reading input
+	inFs afero.Fs
+	// outFs is filesystem to be used for writing out the result
+	outFs afero.Fs
+}
+
+// SetDefaults sets up the default options for RBAC Manifest generator.
+func (o *WriterOptions) SetDefaults() {
+	if o.inFs == nil {
+		o.inFs = afero.NewOsFs()
+	}
+	if o.outFs == nil {
+		o.outFs = afero.NewOsFs()
+	}
+
+	if len(o.InputDir) == 0 {
+		o.InputDir = filepath.Join(".", "pkg", "webhook")
+	}
+	if len(o.OutputDir) == 0 {
+		o.OutputDir = filepath.Join(".", "config", "webhook")
+	}
+	if len(o.PatchOutputDir) == 0 {
+		o.PatchOutputDir = filepath.Join(".", "config", "default")
+	}
+}
+
+// Validate validates the input options.
+func (o *WriterOptions) Validate() error {
+	if _, err := o.inFs.Stat(o.InputDir); err != nil {
+		return fmt.Errorf("invalid input directory '%s' %v", o.InputDir, err)
+	}
+	return nil
+}
+
+// WriteObjectsToDisk writes object to the location specified in WriterOptions.
+func (o *WriterOptions) WriteObjectsToDisk(objects ...runtime.Object) error {
+	exists, err := afero.DirExists(o.outFs, o.OutputDir)
+	if err != nil {
+		return err
+	}
+	if !exists {
+		err = o.outFs.MkdirAll(o.OutputDir, 0766)
+		if err != nil {
+			return err
+		}
+	}
+
+	var buf bytes.Buffer
+	isFirstObject := true
+	for _, obj := range objects {
+		if !isFirstObject {
+			_, err = buf.WriteString("---\n")
+			if err != nil {
+				return err
+			}
+		}
+		marshalled, err := yaml.Marshal(obj)
+		if err != nil {
+			return err
+		}
+		_, err = buf.Write(marshalled)
+		if err != nil {
+			return err
+		}
+		isFirstObject = false
+	}
+	err = afero.WriteFile(o.outFs, path.Join(o.OutputDir, "webhookmanifests.yaml"), buf.Bytes(), 0644)
+	if err != nil {
+		return err
+	}
+	return nil
+}