Add hash interface

internal/k8sdeps/hash.go

@@ -14,8 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// Package hash generates hash strings from configmaps and secrets.
+package k8sdeps
-package hash
 
 import (
 	"crypto/sha256"
@@ -26,8 +25,16 @@ import (
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 )
 
+// KustHash compute hash for unstructured objects
+type KustHash struct{}
+
+// NewKustHash returns a KustHash object
+func NewKustHash() *KustHash {
+	return &KustHash{}
+}
+
 // Hash returns a hash of either a ConfigMap or a Secret
-func Hash(m map[string]interface{}) (string, error) {
+func (h *KustHash) Hash(m map[string]interface{}) (string, error) {
 	u := unstructured.Unstructured{
 		Object: m,
 	}

internal/k8sdeps/hash_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package hash
+package k8sdeps
 
 import (
 	"reflect"

kustomize.go

@@ -29,7 +29,8 @@ func main() {
 
 	if err := commands.NewDefaultCommand(
 		k8sdeps.NewKustDecoder(),
-		k8sdeps.NewKustValidator()).Execute(); err != nil {
+		k8sdeps.NewKustValidator(),
+		k8sdeps.NewKustHash()).Execute(); err != nil {
 		os.Exit(1)
 	}
 	os.Exit(0)

pkg/commands/build/build.go

@@ -60,7 +60,7 @@ Use different transformer configurations by passing files to kustomize
 // NewCmdBuild creates a new build command.
 func NewCmdBuild(
 	out io.Writer, fs fs.FileSystem,
-	decoder ifc.Decoder) *cobra.Command {
+	decoder ifc.Decoder, hash ifc.Hash) *cobra.Command {
 	var o buildOptions
 	var p string
 
@@ -74,7 +74,7 @@ func NewCmdBuild(
 			if err != nil {
 				return err
 			}
-			return o.RunBuild(out, fs, decoder)
+			return o.RunBuild(out, fs, decoder, hash)
 		},
 	}
 	cmd.Flags().StringVarP(
@@ -119,7 +119,7 @@ func (o *buildOptions) Validate(args []string, p string, fs fs.FileSystem) error
 // RunBuild runs build command.
 func (o *buildOptions) RunBuild(
 	out io.Writer, fSys fs.FileSystem,
-	decoder ifc.Decoder) error {
+	decoder ifc.Decoder, hash ifc.Hash) error {
 	rootLoader, err := loader.NewLoader(o.kustomizationPath, "", fSys)
 	if err != nil {
 		return err
@@ -128,7 +128,7 @@ func (o *buildOptions) RunBuild(
 	kt, err := target.NewKustTarget(
 		rootLoader, fSys,
 		makeTransformerconfig(fSys, o.transformerconfigPaths),
-		decoder)
+		decoder, hash)
 	if err != nil {
 		return err
 	}

pkg/commands/build/build_test.go

@@ -125,7 +125,7 @@ func runBuildTestCase(t *testing.T, testcaseName string, updateKustomizeExpected
 		kustomizationPath: testcase.Filename,
 	}
 	buf := bytes.NewBuffer([]byte{})
-	err = ops.RunBuild(buf, fSys, k8sdeps.NewKustDecoder())
+	err = ops.RunBuild(buf, fSys, k8sdeps.NewKustDecoder(), k8sdeps.NewKustHash())
 	switch {
 	case err != nil && len(testcase.ExpectedError) == 0:
 		t.Errorf("unexpected error: %v", err)

pkg/commands/commands.go

@@ -31,7 +31,7 @@ import (
 
 // NewDefaultCommand returns the default (aka root) command for kustomize command.
 func NewDefaultCommand(
-	decoder ifc.Decoder, validator ifc.Validator) *cobra.Command {
+	decoder ifc.Decoder, validator ifc.Validator, hash ifc.Hash) *cobra.Command {
 	fsys := fs.MakeRealFS()
 	stdOut := os.Stdout
 
@@ -47,7 +47,7 @@ See https://sigs.k8s.io/kustomize
 
 	c.AddCommand(
 		// TODO: Make consistent API for newCmd* functions.
-		build.NewCmdBuild(stdOut, fsys, decoder),
+		build.NewCmdBuild(stdOut, fsys, decoder, hash),
 		edit.NewCmdEdit(fsys, validator),
 		misc.NewCmdConfig(fsys),
 		misc.NewCmdVersion(stdOut),

pkg/ifc/ifc.go

@@ -43,3 +43,8 @@ type Loader interface {
 	// Cleanup cleans the loader
 	Cleanup() error
 }
+
+// Hash interface provides function to compute hash of objects
+type Hash interface {
+	Hash(m map[string]interface{}) (string, error)
+}

pkg/target/kusttarget.go

@@ -44,6 +44,7 @@ import (
 type KustTarget struct {
 	kustomization *types.Kustomization
 	decoder       ifc.Decoder
+	hash          ifc.Hash
 	ldr           ifc.Loader
 	fSys          fs.FileSystem
 	tcfg          *transformerconfig.TransformerConfig
@@ -53,7 +54,7 @@ type KustTarget struct {
 func NewKustTarget(
 	ldr ifc.Loader, fSys fs.FileSystem,
 	tcfg *transformerconfig.TransformerConfig,
-	d ifc.Decoder) (*KustTarget, error) {
+	d ifc.Decoder, h ifc.Hash) (*KustTarget, error) {
 	content, err := ldr.Load(constants.KustomizationFileName)
 	if err != nil {
 		return nil, err
@@ -71,6 +72,7 @@ func NewKustTarget(
 		fSys:          fSys,
 		tcfg:          tcfg,
 		decoder:       d,
+		hash:          h,
 	}, nil
 }
 
@@ -97,7 +99,7 @@ func (kt *KustTarget) MakeCustomizedResMap() (resmap.ResMap, error) {
 
 // resolveRefsToGeneratedResources fixes all name references.
 func (kt *KustTarget) resolveRefsToGeneratedResources(m resmap.ResMap) (resmap.ResMap, error) {
-	err := transformers.NewNameHashTransformer().Transform(m)
+	err := transformers.NewNameHashTransformer(kt.hash).Transform(m)
 	if err != nil {
 		return nil, err
 	}
@@ -221,7 +223,7 @@ func (kt *KustTarget) loadCustomizedBases() (resmap.ResMap, *interror.Kustomizat
 			errs.Append(errors.Wrap(err, "couldn't make ldr for "+path))
 			continue
 		}
-		target, err := NewKustTarget(ldr, kt.fSys, kt.tcfg, kt.decoder)
+		target, err := NewKustTarget(ldr, kt.fSys, kt.tcfg, kt.decoder, kt.hash)
 		if err != nil {
 			errs.Append(errors.Wrap(err, "couldn't make target for "+path))
 			continue
@@ -250,7 +252,7 @@ func (kt *KustTarget) loadBasesAsFlatList() ([]*KustTarget, error) {
 			errs.Append(err)
 			continue
 		}
-		target, err := NewKustTarget(ldr, kt.fSys, kt.tcfg, kt.decoder)
+		target, err := NewKustTarget(ldr, kt.fSys, kt.tcfg, kt.decoder, kt.hash)
 		if err != nil {
 			errs.Append(err)
 			continue

pkg/target/kusttarget_test.go

@@ -208,7 +208,7 @@ func TestResources1(t *testing.T) {
 	fakeFs.Mkdir("/")
 	kt, err := NewKustTarget(
 		l, fakeFs, transformerconfig.MakeDefaultTransformerConfig(),
-		k8sdeps.NewKustDecoder())
+		k8sdeps.NewKustDecoder(), k8sdeps.NewKustHash())
 	if err != nil {
 		t.Fatalf("unexpected construction error %v", err)
 	}
@@ -233,7 +233,7 @@ func TestResourceNotFound(t *testing.T) {
 	fakeFs.Mkdir("/")
 	kt, err := NewKustTarget(
 		l, fakeFs, transformerconfig.MakeDefaultTransformerConfig(),
-		k8sdeps.NewKustDecoder())
+		k8sdeps.NewKustDecoder(), k8sdeps.NewKustHash())
 	if err != nil {
 		t.Fatalf("Unexpected construction error %v", err)
 	}
@@ -256,7 +256,7 @@ func TestSecretTimeout(t *testing.T) {
 	fakeFs.Mkdir("/")
 	kt, err := NewKustTarget(
 		l, fakeFs, transformerconfig.MakeDefaultTransformerConfig(),
-		k8sdeps.NewKustDecoder())
+		k8sdeps.NewKustDecoder(), k8sdeps.NewKustHash())
 	if err != nil {
 		t.Fatalf("Unexpected construction error %v", err)
 	}

pkg/transformers/namehash.go

@@ -19,27 +19,29 @@ package transformers
 import (
 	"fmt"
 
-	"sigs.k8s.io/kustomize/pkg/hash"
+	"sigs.k8s.io/kustomize/pkg/ifc"
 	"sigs.k8s.io/kustomize/pkg/resmap"
 	"sigs.k8s.io/kustomize/pkg/resource"
 )
 
 // nameHashTransformer contains the prefix and the path config for each field that
 // the name prefix will be applied.
-type nameHashTransformer struct{}
+type nameHashTransformer struct {
+	hash ifc.Hash
+}
 
 var _ Transformer = &nameHashTransformer{}
 
 // NewNameHashTransformer construct a nameHashTransformer.
-func NewNameHashTransformer() Transformer {
+func NewNameHashTransformer(h ifc.Hash) Transformer {
-	return &nameHashTransformer{}
+	return &nameHashTransformer{hash: h}
 }
 
 // Transform appends hash to configmaps and secrets.
 func (o *nameHashTransformer) Transform(m resmap.ResMap) error {
 	for _, res := range m {
 		if res.IsGenerated() {
-			err := appendHash(res)
+			err := o.appendHash(res)
 			if err != nil {
 				return err
 			}
@@ -48,8 +50,8 @@ func (o *nameHashTransformer) Transform(m resmap.ResMap) error {
 	return nil
 }
 
-func appendHash(res *resource.Resource) error {
+func (o *nameHashTransformer) appendHash(res *resource.Resource) error {
-	h, err := hash.Hash(res.Object)
+	h, err := o.hash.Hash(res.Object)
 	if err != nil {
 		return err
 	}

pkg/transformers/namehash_test.go

@@ -20,6 +20,7 @@ import (
 	"reflect"
 	"testing"
 
+	"sigs.k8s.io/kustomize/internal/k8sdeps"
 	"sigs.k8s.io/kustomize/pkg/ifc"
 	"sigs.k8s.io/kustomize/pkg/resid"
 	"sigs.k8s.io/kustomize/pkg/resmap"
@@ -149,7 +150,7 @@ func TestNameHashTransformer(t *testing.T) {
 			}).SetBehavior(ifc.BehaviorCreate),
 	}
 
-	tran := NewNameHashTransformer()
+	tran := NewNameHashTransformer(k8sdeps.NewKustHash())
 	tran.Transform(objs)
 
 	if !reflect.DeepEqual(objs, expected) {