Support initializing a directory with a Krmfile

cmd/config/internal/commands/cmdinit.go

@@ -0,0 +1,60 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package commands
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/cmd/config/internal/generateddocs/commands"
+	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/kustomize/kyaml/krmfile"
+)
+
+// GetInitRunner returns a command InitRunner.
+func GetInitRunner(name string) *InitRunner {
+	r := &InitRunner{}
+	c := &cobra.Command{
+		Use:     "init DIR...",
+		Args:    cobra.RangeArgs(0, 1),
+		Short:   commands.InitShort,
+		Long:    commands.InitLong,
+		Example: commands.InitExamples,
+		RunE:    r.runE,
+	}
+	fixDocs(name, c)
+	r.Command = c
+	return r
+}
+
+func InitCommand(name string) *cobra.Command {
+	return GetInitRunner(name).Command
+}
+
+// InitRunner contains the init function
+type InitRunner struct {
+	Command *cobra.Command
+}
+
+func (r *InitRunner) runE(c *cobra.Command, args []string) error {
+	var dir string
+	if len(args) == 0 {
+		dir = "."
+	} else {
+		dir = args[0]
+	}
+	filename := filepath.Join(dir, krmfile.KrmfileName)
+
+	if _, err := os.Stat(filename); err == nil || !os.IsNotExist(err) {
+		return errors.Errorf("directory already initialized with a Krmfile")
+	}
+
+	return ioutil.WriteFile(filename, []byte(strings.TrimSpace(`
+apiVersion: config.k8s.io/v1alpha1
+kind: Krmfile
+`)), 0600)
+}