Uses single file for both addLabel and addAnnotation commands, as the code is nearly identical. Tests included.

pkg/commands/addmetadata.go

@@ -0,0 +1,149 @@
+/*
+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 (
+	"fmt"
+	"github.com/kubernetes-sigs/kustomize/pkg/constants"
+	"github.com/kubernetes-sigs/kustomize/pkg/fs"
+	"github.com/spf13/cobra"
+	"regexp"
+	"strings"
+)
+
+type addMetadataOptions struct {
+	metadata string
+}
+
+// newCmdAddAnnotation adds one or more commonAnnotations to the kustomization file.
+func newCmdAddAnnotation(fsys fs.FileSystem) *cobra.Command {
+	var o addMetadataOptions
+
+	cmd := &cobra.Command{
+		Use:   "annotation",
+		Short: "Adds one or more commonAnnotations to the kustomization.yaml in current directory",
+		Example: `
+		add annotation {annotationKey1:annotationValue1},{annotationKey2:annotationValue2}`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			mdKind := "annotation"
+			err := o.Validate(args, mdKind)
+			if err != nil {
+				return err
+			}
+			err = o.Complete(cmd, args)
+			if err != nil {
+				return err
+			}
+			return o.RunAddMetadata(fsys, mdKind)
+		},
+	}
+	return cmd
+}
+
+// newCmdAddLabel adds one or more commonLabels to the kustomization file.
+func newCmdAddLabel(fsys fs.FileSystem) *cobra.Command {
+	var o addMetadataOptions
+
+	cmd := &cobra.Command{
+		Use:   "label",
+		Short: "Adds one or more commonLabels to the kustomization.yaml in current directory",
+		Example: `
+		add label {labelKey1:labelValue1},{labelKey2:labelValue2}`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			mdKind := "label"
+			err := o.Validate(args, mdKind)
+			if err != nil {
+				return err
+			}
+			err = o.Complete(cmd, args)
+			if err != nil {
+				return err
+			}
+			return o.RunAddMetadata(fsys, mdKind)
+		},
+	}
+	return cmd
+}
+
+// Validate validates addLabel and addAnnotation commands.
+func (o *addMetadataOptions) Validate(args []string, mdKind string) error {
+
+	if len(args) < 1 {
+		return fmt.Errorf("must specify %s", mdKind)
+	}
+	if len(args) > 1 {
+		return fmt.Errorf("%ss must be comma-separated, with no spaces. See help text for example", mdKind)
+	}
+	inputs := strings.Split(args[0], ",")
+	for _, input := range inputs {
+		ok, err := regexp.MatchString(`\A([a-zA-Z0-9_.-]+):([a-zA-Z0-9_.-]+)\z`, input)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return fmt.Errorf("invalid %s format: %s", mdKind, input)
+		}
+	}
+
+	o.metadata = args[0]
+	return nil
+}
+
+// Complete completes addMetadata command.
+func (o *addMetadataOptions) Complete(cmd *cobra.Command, args []string) error {
+	return nil
+}
+
+// RunAddMetadata runs addLabel and addAnnotation commands (do real work).
+func (o *addMetadataOptions) RunAddMetadata(fsys fs.FileSystem, mdKind string) error {
+	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	if err != nil {
+		return err
+	}
+
+	m, err := mf.read()
+	if err != nil {
+		return err
+	}
+
+	if mdKind == "label" && m.CommonLabels == nil {
+		m.CommonLabels = make(map[string]string)
+	}
+
+	if mdKind == "annotation" && m.CommonAnnotations == nil {
+		m.CommonAnnotations = make(map[string]string)
+	}
+
+	entries := strings.Split(o.metadata, ",")
+	for _, entry := range entries {
+		kv := strings.Split(entry, ":")
+		if mdKind == "label" {
+			if _, ok := m.CommonLabels[kv[0]]; ok {
+				return fmt.Errorf("%s %s already in kustomization file", mdKind, kv[0])
+			}
+			m.CommonLabels[kv[0]] = kv[1]
+		}
+		if mdKind == "annotation" {
+			if _, ok := m.CommonAnnotations[kv[0]]; ok {
+				return fmt.Errorf("%s %s already in kustomization file", mdKind, kv[0])
+			}
+			m.CommonAnnotations[kv[0]] = kv[1]
+		}
+	}
+
+	return mf.write(m)
+}