Improve command package isolation.

pkg/commands/misc/config.go

@@ -0,0 +1,114 @@
+/*
+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 misc
+
+import (
+	"fmt"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"sigs.k8s.io/kustomize/pkg/fs"
+	"sigs.k8s.io/kustomize/pkg/transformerconfig/defaultconfig"
+)
+
+// NewCmdConfig returns an instance of 'config' subcommand.
+func NewCmdConfig(fsys fs.FileSystem) *cobra.Command {
+	c := &cobra.Command{
+		Use:   "config",
+		Short: "Config Kustomize transformers",
+		Long:  "",
+		Example: `
+	# Save the default transformer configrations to a local directory
+	kustomize config save -d ~/.kustomize/config
+`,
+		Args: cobra.MinimumNArgs(1),
+	}
+	c.AddCommand(
+		newCmdSave(fsys),
+	)
+	return c
+}
+
+type saveOptions struct {
+	saveDirectory string
+}
+
+func newCmdSave(fsys fs.FileSystem) *cobra.Command {
+	var o saveOptions
+
+	c := &cobra.Command{
+		Use:   "save",
+		Short: "Save default kustomize transformer configurations to a local directory",
+		Long:  "",
+		Example: `
+	# Save the default transformer configrations to a local directory
+	save -d ~/.kustomize/config
+
+`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			err := o.Validate()
+			if err != nil {
+				return err
+			}
+			err = o.Complete(fsys)
+			if err != nil {
+				return err
+			}
+			return o.RunSave(fsys)
+		},
+	}
+	c.Flags().StringVarP(
+		&o.saveDirectory,
+		"directory", "d", "",
+		"Directory to save the default transformer configurations")
+
+	return c
+
+}
+
+// Validate validates the saveOptions is not empty
+func (o *saveOptions) Validate() error {
+	if o.saveDirectory == "" {
+		return fmt.Errorf("must specify one local directory to save the default transformer configurations")
+	}
+	return nil
+}
+
+// Complete creates the save directory when the directory doesn't exist
+func (o *saveOptions) Complete(fsys fs.FileSystem) error {
+	if !fsys.Exists(o.saveDirectory) {
+		return fsys.MkdirAll(o.saveDirectory)
+	}
+	if fsys.IsDir(o.saveDirectory) {
+		return nil
+	}
+	return fmt.Errorf("%s is not a directory. Please use a different directory name.", o.saveDirectory)
+}
+
+// RunSave saves the default transformer configurations local directory
+func (o *saveOptions) RunSave(fsys fs.FileSystem) error {
+	m := defaultconfig.GetDefaultPathConfigStrings()
+	for tname, tcfg := range m {
+		filename := filepath.Join(o.saveDirectory, tname+".yaml")
+		err := fsys.WriteFile(filename, []byte(tcfg))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}