fix: performance recession when propagating namespace to helm

api/internal/target/kusttarget.go

@@ -127,11 +127,11 @@ func (kt *KustTarget) MakeCustomizedResMap() (resmap.ResMap, error) {
 }
 
 func (kt *KustTarget) makeCustomizedResMap() (resmap.ResMap, error) {
-	// Track origin for all resources so builtins can make decisions
-	// based on where resources originated from.
-	// Origin annotations will be stripped from the output if not
-	// requested via build metadata options.
-	kt.origin = &resource.Origin{}
+	var origin *resource.Origin
+	if len(kt.kustomization.BuildMetadata) != 0 {
+		origin = &resource.Origin{}
+	}
+	kt.origin = origin
 	ra, err := kt.AccumulateTarget()
 	if err != nil {
 		return nil, err

api/konfig/general.go

@@ -46,4 +46,7 @@ const (
 
 	// Label key that indicates the resources are validated by a validator
 	ValidatedByLabelKey = "validated-by"
+
+	// Annotation key for marking helm-generated resources to skip namespace transformation
+	HelmGeneratedAnnotation = ConfigAnnoDomain + "/helm-generated"
 )

api/krusty/helmchartinflationgenerator_test.go

@@ -1174,6 +1174,7 @@ kind: Service
 metadata:
   annotations:
     helm-namespace: helm-ns
+    internal.config.kubernetes.io/helm-generated: "true"
   name: test-service
   namespace: helm-ns
 `)

api/resource/resource.go

@@ -11,6 +11,7 @@ import (
 	"sigs.k8s.io/kustomize/api/filters/patchstrategicmerge"
 	"sigs.k8s.io/kustomize/api/ifc"
 	"sigs.k8s.io/kustomize/api/internal/utils"
+	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/kio/kioutil"
@@ -47,6 +48,8 @@ var BuildAnnotations = []string{
 	kioutil.LegacyPathAnnotation,
 	kioutil.LegacyIndexAnnotation,
 	kioutil.LegacyIdAnnotation,
+
+	konfig.HelmGeneratedAnnotation,
 }
 
 func (r *Resource) ResetRNode(incoming *Resource) {

plugin/builtin/helmchartinflationgenerator/HelmChartInflationGenerator.go

@@ -17,6 +17,7 @@ import (
 	"slices"
 	"strings"
 
+	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/resmap"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/errors"
@@ -302,6 +303,9 @@ func (p *plugin) Generate() (rm resmap.ResMap, err error) {
 
 	rm, resMapErr := p.h.ResmapFactory().NewResMapFromBytes(stdout)
 	if resMapErr == nil {
+		if err := p.markHelmGeneratedResources(rm); err != nil {
+			return nil, err
+		}
 		return rm, nil
 	}
 	// try to remove the contents before first "---" because
@@ -317,6 +321,9 @@ func (p *plugin) Generate() (rm resmap.ResMap, err error) {
 		if err != nil {
 			return nil, fmt.Errorf("could not parse rnode slice into resource map: %w", err)
 		}
+		if err := p.markHelmGeneratedResources(rm); err != nil {
+			return nil, err
+		}
 		return rm, nil
 	}
 	return nil, fmt.Errorf("could not parse bytes into resource map: %w", resMapErr)
@@ -359,6 +366,15 @@ func (p *plugin) chartExistsLocally() (string, bool) {
 	return path, s.IsDir()
 }
 
+func (p *plugin) markHelmGeneratedResources(rm resmap.ResMap) error {
+	for _, r := range rm.Resources() {
+		if err := r.RNode.PipeE(kyaml.SetAnnotation(konfig.HelmGeneratedAnnotation, "true")); err != nil {
+			return fmt.Errorf("failed to set helm annotation: %w", err)
+		}
+	}
+	return nil
+}
+
 // checkHelmVersion will return an error if the helm version is not V3
 func (p *plugin) checkHelmVersion() error {
 	stdout, err := p.runHelmCommand([]string{"version", "-c", "--short"})

plugin/builtin/helmchartinflationgenerator/HelmChartInflationGenerator_test.go

@@ -191,7 +191,6 @@ type: Opaque
 apiVersion: v1
 kind: Service
 metadata:
-  annotations: {}
   labels:
     app: moria-minecraft
     chart: minecraft-3.1.3
@@ -211,7 +210,6 @@ spec:
 apiVersion: v1
 kind: Service
 metadata:
-  annotations: {}
   labels:
     app: moria-minecraft
     chart: minecraft-3.1.3

plugin/builtin/namespacetransformer/NamespaceTransformer.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 
 	"sigs.k8s.io/kustomize/api/filters/namespace"
+	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/resmap"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/errors"
@@ -56,11 +57,9 @@ func (p *plugin) Transform(m resmap.ResMap) error {
 			// Don't mutate empty objects?
 			continue
 		}
-		if origin, err := r.GetOrigin(); err == nil && origin != nil {
-			if origin.ConfiguredBy.Kind == "HelmChartInflationGenerator" {
-				// Don't apply namespace on Helm generated manifest. Helm should take care of it.
-				continue
-			}
+		if annotations := r.GetAnnotations(konfig.HelmGeneratedAnnotation); annotations[konfig.HelmGeneratedAnnotation] == "true" {
+			// Don't apply namespace on Helm generated manifest. Helm should take care of it.
+			continue
 		}
 		r.StorePreviousId()
 		if err := r.ApplyFilter(namespace.Filter{

plugin/builtin/namespacetransformer/NamespaceTransformer_test.go

@@ -9,9 +9,9 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/provider"
 	"sigs.k8s.io/kustomize/api/resmap"
-	"sigs.k8s.io/kustomize/api/resource"
 	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
 	kyaml "sigs.k8s.io/kustomize/kyaml/yaml"
 )
@@ -779,15 +779,12 @@ kind: Service
 metadata:
   name: svc
   namespace: helm-ns
+  annotations:
+    this-should-be-keept: "true"
 `))
 	require.NoError(t, err)
 	r := rm.Resources()[0]
-	origin := &resource.Origin{
-		ConfiguredBy: kyaml.ResourceIdentifier{
-			TypeMeta: kyaml.TypeMeta{APIVersion: "builtin", Kind: "HelmChartInflationGenerator"},
-		},
-	}
-	require.NoError(t, r.SetOrigin(origin))
+	require.NoError(t, r.RNode.PipeE(kyaml.SetAnnotation(konfig.HelmGeneratedAnnotation, "true")))
 
 	rm, err = th.RunTransformerFromResMap(`
 apiVersion: builtin
@@ -801,6 +798,8 @@ metadata:
 	th.AssertActualEqualsExpectedNoIdAnnotations(rm, `apiVersion: v1
 kind: Service
 metadata:
+  annotations:
+    this-should-be-keept: "true"
   name: svc
   namespace: helm-ns
 `)