setnamespace.go

/*
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"
	"strings"

	"github.com/spf13/cobra"
	"k8s.io/apimachinery/pkg/util/validation"
	"sigs.k8s.io/kustomize/pkg/constants"
	"sigs.k8s.io/kustomize/pkg/fs"
)

type setNamespaceOptions struct {
	namespace string
}

// newCmdSetNamespace sets the value of the namespace field in the kustomization.
func newCmdSetNamespace(fsys fs.FileSystem) *cobra.Command {
	var o setNamespaceOptions

	cmd := &cobra.Command{
		Use:   "namespace",
		Short: "Sets the value of the namespace field in the kustomization file",
		Example: `
The command
	set namespace staging
will add the field "namespace: staging" to the kustomization file if it doesn't exist,
and overwrite the value with "staging" if the field does exist.
`,
		RunE: func(cmd *cobra.Command, args []string) error {
			err := o.Validate(args)
			if err != nil {
				return err
			}
			return o.RunSetNamespace(fsys)
		},
	}
	return cmd
}

// Validate validates setNamespace command.
func (o *setNamespaceOptions) Validate(args []string) error {
	if len(args) != 1 {
		return errors.New("must specify exactly one namespace value")
	}
	ns := args[0]
	if errs := validation.IsDNS1123Label(ns); len(errs) != 0 {
		return fmt.Errorf("%q is not a valid namespace name: %s", ns, strings.Join(errs, ";"))
	}
	o.namespace = ns
	return nil
}

// RunSetNamespace runs setNamespace command (does real work).
func (o *setNamespaceOptions) RunSetNamespace(fsys fs.FileSystem) error {
	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
	if err != nil {
		return err
	}
	m, err := mf.read()
	if err != nil {
		return err
	}
	m.Namespace = o.namespace
	return mf.write(m)
}