add post-renderers to KustomizeGenerator

go.sum

@@ -186,8 +186,6 @@ github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlT
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/sap/go-generics v0.2.53 h1:C5MltWIx6MxpgPxQJa2eupGm3Jim4jIfwm/2KOT1BQM=
-github.com/sap/go-generics v0.2.53/go.mod h1:xqWmp3jVLGNTmTuPjwdWgNk11pzi0zarA1iqV0om24c=
 github.com/sap/go-generics v0.2.54 h1:NbWwKMH4w6Gmts2ilvhmKthwMbzHjJn3zDeh4940T5Q=
 github.com/sap/go-generics v0.2.54/go.mod h1:xqWmp3jVLGNTmTuPjwdWgNk11pzi0zarA1iqV0om24c=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=

internal/kustomize/kustomization.go

@@ -28,7 +28,7 @@ import (
 	"k8s.io/client-go/discovery"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/kustomize/api/konfig"
-	kustypes "sigs.k8s.io/kustomize/api/types"
+	kusttypes "sigs.k8s.io/kustomize/api/types"
 	kustfsys "sigs.k8s.io/kustomize/kyaml/filesys"
 	kyaml "sigs.k8s.io/yaml"
 
@@ -408,10 +408,10 @@ func generateKustomization(fsys kustfsys.FileSystem, kustomizationPath string) (
 		return nil, err
 	}
 
-	kustomization := kustypes.Kustomization{
-		TypeMeta: kustypes.TypeMeta{
-			APIVersion: kustypes.KustomizationVersion,
-			Kind:       kustypes.KustomizationKind,
+	kustomization := kusttypes.Kustomization{
+		TypeMeta: kusttypes.TypeMeta{
+			APIVersion: kusttypes.KustomizationVersion,
+			Kind:       kusttypes.KustomizationKind,
 		},
 		Resources: resources,
 	}

pkg/manifests/kustomize/generator.go

@@ -15,7 +15,7 @@ import (
 	utilyaml "k8s.io/apimachinery/pkg/util/yaml"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/kustomize/api/krusty"
-	kustypes "sigs.k8s.io/kustomize/api/types"
+	kusttypes "sigs.k8s.io/kustomize/api/types"
 	kustfsys "sigs.k8s.io/kustomize/kyaml/filesys"
 
 	"github.com/sap/component-operator-runtime/internal/kustomize"
@@ -65,8 +65,8 @@ func NewKustomizeGenerator(fsys fs.FS, kustomizationPath string, _ client.Client
 	}
 
 	kustomizerOptions := &krusty.Options{
-		LoadRestrictions: kustypes.LoadRestrictionsNone,
-		PluginConfig:     kustypes.DisabledPluginConfig(),
+		LoadRestrictions: kusttypes.LoadRestrictionsNone,
+		PluginConfig:     kusttypes.DisabledPluginConfig(),
 	}
 	kustomizer := krusty.MakeKustomizer(kustomizerOptions)
 

pkg/manifests/transformer.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/Masterminds/sprig/v3"
 
+	"sigs.k8s.io/controller-runtime/pkg/client"
 	kyaml "sigs.k8s.io/yaml"
 
 	"github.com/sap/component-operator-runtime/internal/templatex"
@@ -70,3 +71,27 @@ func (t *TemplateParameterTransformer) TransformParameters(namespace string, nam
 	}
 	return transformedParameters, nil
 }
+
+type SubstitutionObjectTransformer struct{}
+
+var _ ObjectTransformer = &SubstitutionObjectTransformer{}
+
+func NewSubstitutionObjectTransformer(substitutions map[string]string, selector types.Selector[client.Object]) (*SubstitutionObjectTransformer, error) {
+	return &SubstitutionObjectTransformer{}, nil
+}
+
+func (t *SubstitutionObjectTransformer) TransformObjects(namespace string, name string, objects []client.Object) ([]client.Object, error) {
+	return objects, nil
+}
+
+type KustomizeObjectTransformer struct{}
+
+var _ ObjectTransformer = &KustomizeObjectTransformer{}
+
+func NewKustomizeObjectTransformer(patches []KustomizePatch, images []KustomizeImage) (*KustomizeObjectTransformer, error) {
+	return &KustomizeObjectTransformer{}, nil
+}
+
+func (t *KustomizeObjectTransformer) TransformObjects(namespace string, name string, objects []client.Object) ([]client.Object, error) {
+	return objects, nil
+}

pkg/manifests/types.go

@@ -47,3 +47,34 @@ type ObjectTransformer interface {
 type Decryptor interface {
 	Decrypt(input []byte, path string) ([]byte, error)
 }
+
+// +kubebuilder:object:generate=true
+
+// Kustomize patch specification, basically a subset of sigs.k8s.io/kustomize/api/types#Patch
+type KustomizePatch struct {
+	Patch  string             `json:"patch,omitempty"`
+	Target *KustomizeSelector `json:"target,omitempty"`
+}
+
+// +kubebuilder:object:generate=true
+
+// Kustomize object selector; corresponds to sigs.k8s.io/kustomize/api/types#Selector
+type KustomizeSelector struct {
+	Group              string `json:"group,omitempty"`
+	Version            string `json:"version,omitempty"`
+	Kind               string `json:"kind,omitempty"`
+	Name               string `json:"name,omitempty"`
+	Namespace          string `json:"namespace,omitempty"`
+	AnnotationSelector string `json:"annotationSelector,omitempty"`
+	LabelSelector      string `json:"labelSelector,omitempty"`
+}
+
+// +kubebuilder:object:generate=true
+
+// Kustomize image modifier specification, basically a subset of sigs.k8s.io/kustomize/api/types#Image
+type KustomizeImage struct {
+	Name    string `json:"name"`
+	NewName string `json:"newName,omitempty"`
+	NewTag  string `json:"newTag,omitempty"`
+	Digest  string `json:"digest,omitempty"`
+}

pkg/types/selector.go

@@ -0,0 +1,18 @@
+/*
+SPDX-FileCopyrightText: 2026 SAP SE or an SAP affiliate company and component-operator-runtime contributors
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package types
+
+type Selector[T any] interface {
+	Matches(object T) bool
+}
+
+type SelectorFunc[T any] func(object T) bool
+
+func (s SelectorFunc[T]) Matches(object T) bool {
+	return s(object)
+}
+
+var _ Selector[any] = SelectorFunc[any](nil)