Improve command package isolation.

pkg/commands/build/build.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package build
 
 import (
 	"errors"
@@ -57,8 +57,8 @@ Use different transformer configurations by passing files to kustomize
     build somedir -t some-transformer-configfile,another-transformer-configfile
 `
 
-// newCmdBuild creates a new build command.
-func newCmdBuild(
+// NewCmdBuild creates a new build command.
+func NewCmdBuild(
 	out io.Writer, fs fs.FileSystem,
 	decoder ifc.Decoder) *cobra.Command {
 	var o buildOptions

pkg/commands/build/build_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package build
 
 import (
 	"bytes"
@@ -22,12 +22,12 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
-	"sigs.k8s.io/kustomize/internal/k8sdeps"
 	"strings"
 	"testing"
 
 	"github.com/ghodss/yaml"
-
+	"sigs.k8s.io/kustomize/internal/k8sdeps"
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
@@ -99,7 +99,7 @@ func TestBuild(t *testing.T) {
 		return nil
 	})
 	// sanity check that we found the right folder
-	if !stringInSlice("simple", testcases) {
+	if !kustfile.StringInSlice("simple", testcases) {
 		t.Fatalf("Error locating testcases")
 	}
 

pkg/commands/build/testdata/testcase-simple/test.yaml

@@ -1,5 +1,5 @@
 description: simple
 args: []
-filename: ../examplelayout/simple/instances/exampleinstance/
+filename: ../../examplelayout/simple/instances/exampleinstance/
 expectedStdout: testdata/testcase-simple/expected.yaml
 expectedDiff: testdata/testcase-simple/expected.diff

pkg/commands/commands.go

@@ -22,6 +22,9 @@ import (
 	"os"
 
 	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/commands/build"
+	"sigs.k8s.io/kustomize/pkg/commands/edit"
+	"sigs.k8s.io/kustomize/pkg/commands/misc"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/ifc"
 )
@@ -44,10 +47,10 @@ See https://sigs.k8s.io/kustomize
 
 	c.AddCommand(
 		// TODO: Make consistent API for newCmd* functions.
-		newCmdBuild(stdOut, fsys, decoder),
-		newCmdEdit(fsys, validator),
-		newCmdConfig(fsys),
-		newCmdVersion(stdOut),
+		build.NewCmdBuild(stdOut, fsys, decoder),
+		edit.NewCmdEdit(fsys, validator),
+		misc.NewCmdConfig(fsys),
+		misc.NewCmdVersion(stdOut),
 	)
 	c.PersistentFlags().AddGoFlagSet(flag.CommandLine)
 
@@ -56,85 +59,3 @@ See https://sigs.k8s.io/kustomize
 	flag.CommandLine.Parse([]string{})
 	return c
 }
-
-// newCmdEdit returns an instance of 'edit' subcommand.
-func newCmdEdit(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
-	c := &cobra.Command{
-		Use:   "edit",
-		Short: "Edits a kustomization file",
-		Long:  "",
-		Example: `
-	# Adds a configmap to the kustomization file
-	kustomize edit add configmap NAME --from-literal=k=v
-
-	# Sets the nameprefix field
-	kustomize edit set nameprefix <prefix-value>
-`,
-		Args: cobra.MinimumNArgs(1),
-	}
-	c.AddCommand(
-		newCmdAdd(fsys, v),
-		newCmdSet(fsys, v),
-	)
-	return c
-}
-
-// newAddCommand returns an instance of 'add' subcommand.
-func newCmdAdd(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
-	c := &cobra.Command{
-		Use:   "add",
-		Short: "Adds configmap/resource/patch/base to the kustomization file.",
-		Long:  "",
-		Example: `
-	# Adds a configmap to the kustomization file
-	kustomize edit add configmap NAME --from-literal=k=v
-
-	# Adds a resource to the kustomization
-	kustomize edit add resource <filepath>
-
-	# Adds a patch to the kustomization
-	kustomize edit add patch <filepath>
-
-	# Adds one or more base directories to the kustomization
-	kustomize edit add base <filepath>
-	kustomize edit add base <filepath1>,<filepath2>,<filepath3>
-
-	# Adds one or more commonLabels to the kustomization
-	kustomize edit add label {labelKey1:labelValue1},{labelKey2:labelValue2}
-
-	# Adds one or more commonAnnotations to the kustomization
-	kustomize edit add annotation {annotationKey1:annotationValue1},{annotationKey2:annotationValue2}
-`,
-		Args: cobra.MinimumNArgs(1),
-	}
-	c.AddCommand(
-		newCmdAddResource(fsys),
-		newCmdAddPatch(fsys),
-		newCmdAddConfigMap(fsys),
-		newCmdAddBase(fsys),
-		newCmdAddLabel(fsys, v.MakeLabelValidator()),
-		newCmdAddAnnotation(fsys, v.MakeAnnotationValidator()),
-	)
-	return c
-}
-
-// newSetCommand returns an instance of 'set' subcommand.
-func newCmdSet(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
-	c := &cobra.Command{
-		Use:   "set",
-		Short: "Sets the value of different fields in kustomization file.",
-		Long:  "",
-		Example: `
-	# Sets the nameprefix field
-	kustomize edit set nameprefix <prefix-value>
-`,
-		Args: cobra.MinimumNArgs(1),
-	}
-
-	c.AddCommand(
-		newCmdSetNamePrefix(fsys),
-		newCmdSetNamespace(fsys, v),
-		newCmdSetImageTag(fsys),
-	)
-	return c
-}

pkg/commands/edit/add/addbase.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"errors"
@@ -22,7 +22,7 @@ import (
 	"strings"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
@@ -71,12 +71,12 @@ func (o *addBaseOptions) Complete(cmd *cobra.Command, args []string) error {
 
 // RunAddBase runs addBase command (do real work).
 func (o *addBaseOptions) RunAddBase(fsys fs.FileSystem) error {
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
 
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
@@ -87,12 +87,12 @@ func (o *addBaseOptions) RunAddBase(fsys fs.FileSystem) error {
 		if !fsys.Exists(path) {
 			return errors.New(path + " does not exist")
 		}
-		if stringInSlice(path, m.Bases) {
+		if kustfile.StringInSlice(path, m.Bases) {
 			return fmt.Errorf("base %s already in kustomization file", path)
 		}
 		m.Bases = append(m.Bases, path)
 
 	}
 
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/add/addbase_test.go

@@ -14,13 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
+	"strings"
 	"testing"
 
-	"strings"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
@@ -35,7 +35,7 @@ func TestAddBaseHappyPath(t *testing.T) {
 	for _, base := range bases {
 		fakeFS.Mkdir(base)
 	}
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddBase(fakeFS)
 	args := []string{baseDirectoryPaths}
@@ -62,7 +62,7 @@ func TestAddBaseAlreadyThere(t *testing.T) {
 	for _, base := range bases {
 		fakeFS.Mkdir(base)
 	}
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddBase(fakeFS)
 	args := []string{baseDirectoryPaths}
@@ -79,7 +79,7 @@ func TestAddBaseAlreadyThere(t *testing.T) {
 	for _, base := range bases {
 		msg := "base " + base + " already in kustomization file"
 		expectedErrors = append(expectedErrors, msg)
-		if !stringInSlice(msg, expectedErrors) {
+		if !kustfile.StringInSlice(msg, expectedErrors) {
 			t.Errorf("unexpected error %v", err)
 		}
 	}

pkg/commands/edit/add/addmetadata.go

@@ -14,13 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"fmt"
 	"strings"
 
 	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/types"
@@ -91,11 +92,11 @@ func (o *addMetadataOptions) runE(
 	if err != nil {
 		return err
 	}
-	kf, err := newKustomizationFile(constants.KustomizationFileName, fSys)
+	kf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fSys)
 	if err != nil {
 		return err
 	}
-	m, err := kf.read()
+	m, err := kf.Read()
 	if err != nil {
 		return err
 	}
@@ -103,7 +104,7 @@ func (o *addMetadataOptions) runE(
 	if err != nil {
 		return err
 	}
-	return kf.write(m)
+	return kf.Write(m)
 }
 
 // validateAndParse validates `add` commands and parses them into o.metadata

pkg/commands/edit/add/addmetadata_test.go

@@ -14,11 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"testing"
 
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/types"
@@ -27,12 +28,12 @@ import (
 
 func makeKustomization(t *testing.T) *types.Kustomization {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
-	kf, err := newKustomizationFile(constants.KustomizationFileName, fakeFS)
+	fakeFS.WriteTestKustomization()
+	kf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fakeFS)
 	if err != nil {
 		t.Errorf("unexpected new error %v", err)
 	}
-	m, err := kf.read()
+	m, err := kf.Read()
 	if err != nil {
 		t.Errorf("unexpected read error %v", err)
 	}
@@ -92,7 +93,7 @@ func TestAddAnnotationInvalidFormat(t *testing.T) {
 
 func TestAddAnnotationManyArgs(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 	v := validators.MakeHappyMapValidator(t)
 	cmd := newCmdAddAnnotation(fakeFS, v.Validator)
 	args := []string{"k1:v1,k2:v2,k3:v3,k4:v5"}
@@ -135,7 +136,7 @@ func TestAddAnnotationTooManyColons(t *testing.T) {
 
 func TestAddAnnotationNoValue(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 	v := validators.MakeHappyMapValidator(t)
 	cmd := newCmdAddAnnotation(fakeFS, v.Validator)
 	args := []string{"no:,value"}
@@ -148,7 +149,7 @@ func TestAddAnnotationNoValue(t *testing.T) {
 
 func TestAddAnnotationMultipleArgs(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 	v := validators.MakeHappyMapValidator(t)
 	cmd := newCmdAddAnnotation(fakeFS, v.Validator)
 	args := []string{"this:annotation", "has:spaces"}
@@ -245,7 +246,7 @@ func TestAddLabelTooManyColons(t *testing.T) {
 
 func TestAddLabelNoValue(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 	v := validators.MakeHappyMapValidator(t)
 	cmd := newCmdAddLabel(fakeFS, v.Validator)
 	args := []string{"no,value:"}
@@ -258,7 +259,7 @@ func TestAddLabelNoValue(t *testing.T) {
 
 func TestAddLabelMultipleArgs(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 	v := validators.MakeHappyMapValidator(t)
 	cmd := newCmdAddLabel(fakeFS, v.Validator)
 	args := []string{"this:input", "has:spaces"}

pkg/commands/edit/add/addpatch.go

@@ -14,14 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"errors"
 	"log"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/patch"
@@ -79,23 +79,23 @@ func (o *addPatchOptions) RunAddPatch(fsys fs.FileSystem) error {
 		return nil
 	}
 
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
 
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
 
 	for _, p := range patches {
-		if patch.Exist(m.PatchesStrategicMerge, p) || stringInSlice(p, m.Patches) {
+		if patch.Exist(m.PatchesStrategicMerge, p) || kustfile.StringInSlice(p, m.Patches) {
 			log.Printf("patch %s already in kustomization file", p)
 			continue
 		}
 		m.PatchesStrategicMerge = patch.Append(m.PatchesStrategicMerge, p)
 	}
 
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/add/addpatch_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"testing"
@@ -37,7 +37,7 @@ func TestAddPatchHappyPath(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
 	fakeFS.WriteFile(patchFileName, []byte(patchFileContent))
 	fakeFS.WriteFile(patchFileName+"another", []byte(patchFileContent))
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddPatch(fakeFS)
 	args := []string{patchFileName + "*"}
@@ -60,7 +60,7 @@ func TestAddPatchHappyPath(t *testing.T) {
 func TestAddPatchAlreadyThere(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
 	fakeFS.WriteFile(patchFileName, []byte(patchFileContent))
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddPatch(fakeFS)
 	args := []string{patchFileName}

pkg/commands/edit/add/addresource.go

@@ -14,14 +14,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"errors"
 	"log"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
@@ -78,23 +78,23 @@ func (o *addResourceOptions) RunAddResource(fsys fs.FileSystem) error {
 		return nil
 	}
 
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
 
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
 
 	for _, resource := range resources {
-		if stringInSlice(resource, m.Resources) {
+		if kustfile.StringInSlice(resource, m.Resources) {
 			log.Printf("resource %s already in kustomization file", resource)
 			continue
 		}
 		m.Resources = append(m.Resources, resource)
 	}
 
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/add/addresource_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"strings"
@@ -29,22 +29,6 @@ const (
 	resourceFileContent = `
 Lorem ipsum dolor sit amet, consectetur adipiscing elit,
 sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
-`
-	kustomizationContent = `namePrefix: some-prefix
-# Labels to add to all objects and selectors.
-# These labels would also be used to form the selector for apply --prune
-# Named differently than “labels” to avoid confusion with metadata for this object
-commonLabels:
-  app: helloworld
-commonAnnotations:
-  note: This is an example annotation
-resources: []
-#- service.yaml
-#- ../some-dir/
-# There could also be configmaps in Base, which would make these overlays
-configMapGenerator: []
-# There could be secrets in Base, if just using a fork/rebase workflow
-secretGenerator: []
 `
 )
 
@@ -52,7 +36,7 @@ func TestAddResourceHappyPath(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
 	fakeFS.WriteFile(resourceFileName, []byte(resourceFileContent))
 	fakeFS.WriteFile(resourceFileName+"another", []byte(resourceFileContent))
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddResource(fakeFS)
 	args := []string{resourceFileName + "*"}
@@ -75,7 +59,7 @@ func TestAddResourceHappyPath(t *testing.T) {
 func TestAddResourceAlreadyThere(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
 	fakeFS.WriteFile(resourceFileName, []byte(resourceFileContent))
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdAddResource(fakeFS)
 	args := []string{resourceFileName}

pkg/commands/edit/add/all.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2017 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 add
+
+import (
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/fs"
+	"sigs.k8s.io/kustomize/pkg/ifc"
+)
+
+// NewCmdAdd returns an instance of 'add' subcommand.
+func NewCmdAdd(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
+	c := &cobra.Command{
+		Use:   "add",
+		Short: "Adds configmap/resource/patch/base to the kustomization file.",
+		Long:  "",
+		Example: `
+	# Adds a configmap to the kustomization file
+	kustomize edit add configmap NAME --from-literal=k=v
+
+	# Adds a resource to the kustomization
+	kustomize edit add resource <filepath>
+
+	# Adds a patch to the kustomization
+	kustomize edit add patch <filepath>
+
+	# Adds one or more base directories to the kustomization
+	kustomize edit add base <filepath>
+	kustomize edit add base <filepath1>,<filepath2>,<filepath3>
+
+	# Adds one or more commonLabels to the kustomization
+	kustomize edit add label {labelKey1:labelValue1},{labelKey2:labelValue2}
+
+	# Adds one or more commonAnnotations to the kustomization
+	kustomize edit add annotation {annotationKey1:annotationValue1},{annotationKey2:annotationValue2}
+`,
+		Args: cobra.MinimumNArgs(1),
+	}
+	c.AddCommand(
+		newCmdAddResource(fsys),
+		newCmdAddPatch(fsys),
+		newCmdAddConfigMap(fsys),
+		newCmdAddBase(fsys),
+		newCmdAddLabel(fsys, v.MakeLabelValidator()),
+		newCmdAddAnnotation(fsys, v.MakeAnnotationValidator()),
+	)
+	return c
+}

pkg/commands/edit/add/cmapflagsandargs.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"fmt"

pkg/commands/edit/add/cmapflagsandargs_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"reflect"

pkg/commands/edit/add/configmap.go

@@ -14,13 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"fmt"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/configmapandsecret"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
@@ -28,6 +28,7 @@ import (
 	"sigs.k8s.io/kustomize/pkg/types"
 )
 
+// newCmdAddConfigMap returns a new command.
 func newCmdAddConfigMap(fSys fs.FileSystem) *cobra.Command {
 	var flagsAndArgs cMapFlagsAndArgs
 	cmd := &cobra.Command{
@@ -56,12 +57,12 @@ func newCmdAddConfigMap(fSys fs.FileSystem) *cobra.Command {
 			}
 
 			// Load the kustomization file.
-			mf, err := newKustomizationFile(constants.KustomizationFileName, fSys)
+			mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fSys)
 			if err != nil {
 				return err
 			}
 
-			kustomization, err := mf.read()
+			kustomization, err := mf.Read()
 			if err != nil {
 				return err
 			}
@@ -76,7 +77,7 @@ func newCmdAddConfigMap(fSys fs.FileSystem) *cobra.Command {
 			}
 
 			// Write out the kustomization file with added configmap.
-			return mf.write(kustomization)
+			return mf.Write(kustomization)
 		},
 	}
 

pkg/commands/edit/add/configmap_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"testing"

pkg/commands/edit/add/util.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package add
 
 import (
 	"log"

pkg/commands/edit/all.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2017 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 edit
+
+import (
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/commands/edit/add"
+	"sigs.k8s.io/kustomize/pkg/commands/edit/set"
+	"sigs.k8s.io/kustomize/pkg/fs"
+	"sigs.k8s.io/kustomize/pkg/ifc"
+)
+
+// NewCmdEdit returns an instance of 'edit' subcommand.
+func NewCmdEdit(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
+	c := &cobra.Command{
+		Use:   "edit",
+		Short: "Edits a kustomization file",
+		Long:  "",
+		Example: `
+	# Adds a configmap to the kustomization file
+	kustomize edit add configmap NAME --from-literal=k=v
+
+	# Sets the nameprefix field
+	kustomize edit set nameprefix <prefix-value>
+`,
+		Args: cobra.MinimumNArgs(1),
+	}
+	c.AddCommand(
+		add.NewCmdAdd(fsys, v),
+		set.NewCmdSet(fsys, v),
+	)
+	return c
+}

pkg/commands/edit/set/all.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2017 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 set
+
+import (
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/fs"
+	"sigs.k8s.io/kustomize/pkg/ifc"
+)
+
+// NewCmdSet returns an instance of 'set' subcommand.
+func NewCmdSet(fsys fs.FileSystem, v ifc.Validator) *cobra.Command {
+	c := &cobra.Command{
+		Use:   "set",
+		Short: "Sets the value of different fields in kustomization file.",
+		Long:  "",
+		Example: `
+	# Sets the nameprefix field
+	kustomize edit set nameprefix <prefix-value>
+`,
+		Args: cobra.MinimumNArgs(1),
+	}
+
+	c.AddCommand(
+		newCmdSetNamePrefix(fsys),
+		newCmdSetNamespace(fsys, v),
+		newCmdSetImageTag(fsys),
+	)
+	return c
+}

pkg/commands/edit/set/set_name_prefix.go

@@ -14,13 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
 	"errors"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
@@ -74,14 +74,14 @@ func (o *setNamePrefixOptions) Complete(cmd *cobra.Command, args []string) error
 
 // RunSetNamePrefix runs setNamePrefix command (does real work).
 func (o *setNamePrefixOptions) RunSetNamePrefix(fsys fs.FileSystem) error {
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
 	m.NamePrefix = o.prefix
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/set/set_name_prefix_test.go

@@ -14,12 +14,11 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
-	"testing"
-
 	"strings"
+	"testing"
 
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
@@ -31,7 +30,7 @@ const (
 
 func TestSetNamePrefixHappyPath(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdSetNamePrefix(fakeFS)
 	args := []string{goodPrefixValue}

pkg/commands/edit/set/setimagetag.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
 	"errors"
@@ -23,7 +23,7 @@ import (
 	"strings"
 
 	"github.com/spf13/cobra"
-
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/types"
@@ -100,11 +100,11 @@ func (o *setImageTagOptions) Validate(args []string) error {
 
 // RunSetImageTags runs setImageTags command (does real work).
 func (o *setImageTagOptions) RunSetImageTags(fsys fs.FileSystem) error {
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
@@ -127,5 +127,5 @@ func (o *setImageTagOptions) RunSetImageTags(fsys fs.FileSystem) error {
 
 	m.ImageTags = imageTags
 
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/set/setimagetag_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
 	"strings"
@@ -26,7 +26,7 @@ import (
 
 func TestSetImageTagsHappyPath(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdSetImageTag(fakeFS)
 	args := []string{"image1:tag1", "image2:tag2", "localhost:5000/operator:1.0.0",
@@ -57,7 +57,7 @@ imageTags:
 
 func TestSetImageTagsOverride(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdSetImageTag(fakeFS)
 	args := []string{"image1:tag1", "image2:tag1"}

pkg/commands/edit/set/setnamespace.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
 	"errors"
@@ -22,6 +22,7 @@ import (
 	"strings"
 
 	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/pkg/commands/kustfile"
 	"sigs.k8s.io/kustomize/pkg/constants"
 	"sigs.k8s.io/kustomize/pkg/fs"
 	"sigs.k8s.io/kustomize/pkg/ifc"
@@ -72,14 +73,14 @@ func (o *setNamespaceOptions) Validate(args []string) error {
 
 // RunSetNamespace runs setNamespace command (does real work).
 func (o *setNamespaceOptions) RunSetNamespace(fsys fs.FileSystem) error {
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := kustfile.NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		return err
 	}
-	m, err := mf.read()
+	m, err := mf.Read()
 	if err != nil {
 		return err
 	}
 	m.Namespace = o.namespace
-	return mf.write(m)
+	return mf.Write(m)
 }

pkg/commands/edit/set/setnamespace_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package set
 
 import (
 	"fmt"
@@ -32,7 +32,7 @@ const (
 
 func TestSetNamespaceHappyPath(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdSetNamespace(fakeFS, validators.MakeFakeValidator())
 	args := []string{goodNamespaceValue}
@@ -52,7 +52,7 @@ func TestSetNamespaceHappyPath(t *testing.T) {
 
 func TestSetNamespaceOverride(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+	fakeFS.WriteTestKustomization()
 
 	cmd := newCmdSetNamespace(fakeFS, validators.MakeFakeValidator())
 	args := []string{goodNamespaceValue}
@@ -90,7 +90,6 @@ func TestSetNamespaceNoArgs(t *testing.T) {
 
 func TestSetNamespaceInvalid(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
-	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
 
 	cmd := newCmdSetNamespace(fakeFS, validators.MakeFakeValidator())
 	args := []string{"/badnamespace/"}

pkg/commands/kustfile/kustomizationfile.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package kustfile
 
 import (
 	"bytes"
@@ -77,7 +77,8 @@ type kustomizationFile struct {
 	originalFields []*commentedField
 }
 
-func newKustomizationFile(mPath string, fsys fs.FileSystem) (*kustomizationFile, error) { // nolint
+// NewKustomizationFile returns a new instance.
+func NewKustomizationFile(mPath string, fsys fs.FileSystem) (*kustomizationFile, error) { // nolint
 	mf := &kustomizationFile{path: mPath, fsys: fsys}
 	err := mf.validate()
 	if err != nil {
@@ -104,7 +105,7 @@ func (mf *kustomizationFile) validate() error {
 	return nil
 }
 
-func (mf *kustomizationFile) read() (*types.Kustomization, error) {
+func (mf *kustomizationFile) Read() (*types.Kustomization, error) {
 	data, err := mf.fsys.ReadFile(mf.path)
 	if err != nil {
 		return nil, err
@@ -121,7 +122,7 @@ func (mf *kustomizationFile) read() (*types.Kustomization, error) {
 	return &kustomization, err
 }
 
-func (mf *kustomizationFile) write(kustomization *types.Kustomization) error {
+func (mf *kustomizationFile) Write(kustomization *types.Kustomization) error {
 	if kustomization == nil {
 		return errors.New("util: kustomization file arg is nil")
 	}
@@ -132,7 +133,8 @@ func (mf *kustomizationFile) write(kustomization *types.Kustomization) error {
 	return mf.fsys.WriteFile(mf.path, data)
 }
 
-func stringInSlice(str string, list []string) bool {
+// StringInSlice returns true if the string is in the slice.
+func StringInSlice(str string, list []string) bool {
 	for _, v := range list {
 		if v == str {
 			return true

pkg/commands/kustfile/kustomizationfile_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package commands
+package kustfile
 
 import (
 	"reflect"
@@ -33,16 +33,16 @@ func TestWriteAndRead(t *testing.T) {
 
 	fsys := fs.MakeFakeFS()
 	fsys.Create(constants.KustomizationFileName)
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
 
-	if err := mf.write(kustomization); err != nil {
+	if err := mf.Write(kustomization); err != nil {
 		t.Fatalf("Couldn't write kustomization file: %v\n", err)
 	}
 
-	content, err := mf.read()
+	content, err := mf.Read()
 	if err != nil {
 		t.Fatalf("Couldn't read kustomization file: %v\n", err)
 	}
@@ -53,7 +53,7 @@ func TestWriteAndRead(t *testing.T) {
 
 func TestEmptyFile(t *testing.T) {
 	fsys := fs.MakeFakeFS()
-	_, err := newKustomizationFile("", fsys)
+	_, err := NewKustomizationFile("", fsys)
 	if err == nil {
 		t.Fatalf("Create kustomizationFile from empty filename should fail")
 	}
@@ -64,7 +64,7 @@ func TestNewNotExist(t *testing.T) {
 	fakeFS := fs.MakeFakeFS()
 	fakeFS.Mkdir(".")
 	fakeFS.Create(badSuffix)
-	_, err := newKustomizationFile(constants.KustomizationFileName, fakeFS)
+	_, err := NewKustomizationFile(constants.KustomizationFileName, fakeFS)
 	if err == nil {
 		t.Fatalf("expect an error")
 	}
@@ -72,14 +72,14 @@ func TestNewNotExist(t *testing.T) {
 	if !strings.Contains(err.Error(), contained) {
 		t.Fatalf("expect an error contains %q, but got %v", contained, err)
 	}
-	_, err = newKustomizationFile(constants.KustomizationFileName, fakeFS)
+	_, err = NewKustomizationFile(constants.KustomizationFileName, fakeFS)
 	if err == nil {
 		t.Fatalf("expect an error")
 	}
 	if !strings.Contains(err.Error(), contained) {
 		t.Fatalf("expect an error contains %q, but got %v", contained, err)
 	}
-	_, err = newKustomizationFile(badSuffix, fakeFS)
+	_, err = NewKustomizationFile(badSuffix, fakeFS)
 	if err == nil {
 		t.Fatalf("expect an error")
 	}
@@ -116,15 +116,15 @@ patchesStrategicMerge:
 	fsys := fs.MakeFakeFS()
 	fsys.Create(constants.KustomizationFileName)
 	fsys.WriteFile(constants.KustomizationFileName, kustomizationContentWithComments)
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
-	kustomization, err := mf.read()
+	kustomization, err := mf.Read()
 	if err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
-	if err = mf.write(kustomization); err != nil {
+	if err = mf.Write(kustomization); err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
 	bytes, _ := fsys.ReadFile(mf.path)
@@ -207,16 +207,16 @@ patchesStrategicMerge:
 	fsys := fs.MakeFakeFS()
 	fsys.Create(constants.KustomizationFileName)
 	fsys.WriteFile(constants.KustomizationFileName, kustomizationContentWithComments)
-	mf, err := newKustomizationFile(constants.KustomizationFileName, fsys)
+	mf, err := NewKustomizationFile(constants.KustomizationFileName, fsys)
 	if err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
 
-	kustomization, err := mf.read()
+	kustomization, err := mf.Read()
 	if err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
-	if err = mf.write(kustomization); err != nil {
+	if err = mf.Write(kustomization); err != nil {
 		t.Fatalf("Unexpected Error: %v", err)
 	}
 	bytes, _ := fsys.ReadFile(mf.path)