⚠️ Drop unnecessary fields from contract-versioned object references

api/controlplane/kubeadm/v1beta1/conversion.go

@@ -17,8 +17,13 @@ limitations under the License.
 package v1beta1
 
 import (
+	"errors"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	apimachineryconversion "k8s.io/apimachinery/pkg/conversion"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/utils/ptr"
 	"sigs.k8s.io/controller-runtime/pkg/conversion"
 
@@ -30,12 +35,26 @@ import (
 	utilconversion "sigs.k8s.io/cluster-api/util/conversion"
 )
 
+var apiVersionGetter = func(_ schema.GroupKind) (string, error) {
+	return "", errors.New("apiVersionGetter not set")
+}
+
+func SetAPIVersionGetter(f func(gk schema.GroupKind) (string, error)) {
+	apiVersionGetter = f
+}
+
 func (src *KubeadmControlPlane) ConvertTo(dstRaw conversion.Hub) error {
 	dst := dstRaw.(*controlplanev1.KubeadmControlPlane)
 	if err := Convert_v1beta1_KubeadmControlPlane_To_v1beta2_KubeadmControlPlane(src, dst, nil); err != nil {
 		return err
 	}
 
+	infraRef, err := convertToContractVersionedObjectReference(&src.Spec.MachineTemplate.InfrastructureRef)
+	if err != nil {
+		return err
+	}
+	dst.Spec.MachineTemplate.InfrastructureRef = *infraRef
+
 	// Manually restore data.
 	restored := &controlplanev1.KubeadmControlPlane{}
 	ok, err := utilconversion.UnmarshalData(src, restored)
@@ -57,6 +76,12 @@ func (dst *KubeadmControlPlane) ConvertFrom(srcRaw conversion.Hub) error {
 		return err
 	}
 
+	infraRef, err := convertToObjectReference(&src.Spec.MachineTemplate.InfrastructureRef, src.Namespace)
+	if err != nil {
+		return err
+	}
+	dst.Spec.MachineTemplate.InfrastructureRef = *infraRef
+
 	// Convert timeouts moved from one struct to another.
 	dst.Spec.KubeadmConfigSpec.ConvertFrom(&src.Spec.KubeadmConfigSpec)
 
@@ -270,3 +295,45 @@ func Convert_v1_Condition_To_v1beta1_Condition(in *metav1.Condition, out *cluste
 func Convert_v1beta1_Condition_To_v1_Condition(in *clusterv1beta1.Condition, out *metav1.Condition, s apimachineryconversion.Scope) error {
 	return clusterv1beta1.Convert_v1beta1_Condition_To_v1_Condition(in, out, s)
 }
+
+func Convert_v1_ObjectReference_To_v1beta2_ContractVersionedObjectReference(_ *corev1.ObjectReference, _ *clusterv1.ContractVersionedObjectReference, _ apimachineryconversion.Scope) error {
+	// This is implemented in ConvertTo/ConvertFrom as we have all necessary information available there.
+	return nil
+}
+
+func Convert_v1beta2_ContractVersionedObjectReference_To_v1_ObjectReference(_ *clusterv1.ContractVersionedObjectReference, _ *corev1.ObjectReference, _ apimachineryconversion.Scope) error {
+	// This is implemented in ConvertTo/ConvertFrom as we have all necessary information available there.
+	return nil
+}
+
+func convertToContractVersionedObjectReference(ref *corev1.ObjectReference) (*clusterv1.ContractVersionedObjectReference, error) {
+	var apiGroup string
+	if ref.APIVersion != "" {
+		gv, err := schema.ParseGroupVersion(ref.APIVersion)
+		if err != nil {
+			return nil, fmt.Errorf("failed to convert object: failed to parse apiVersion: %v", err)
+		}
+		apiGroup = gv.Group
+	}
+	return &clusterv1.ContractVersionedObjectReference{
+		APIGroup: apiGroup,
+		Kind:     ref.Kind,
+		Name:     ref.Name,
+	}, nil
+}
+
+func convertToObjectReference(ref *clusterv1.ContractVersionedObjectReference, namespace string) (*corev1.ObjectReference, error) {
+	apiVersion, err := apiVersionGetter(schema.GroupKind{
+		Group: ref.APIGroup,
+		Kind:  ref.Kind,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("failed to convert object: %v", err)
+	}
+	return &corev1.ObjectReference{
+		APIVersion: apiVersion,
+		Kind:       ref.Kind,
+		Namespace:  namespace,
+		Name:       ref.Name,
+	}, nil
+}

api/controlplane/kubeadm/v1beta1/conversion_test.go

@@ -19,12 +19,14 @@ limitations under the License.
 package v1beta1
 
 import (
+	"fmt"
 	"reflect"
 	"testing"
 	"time"
 
 	"k8s.io/apimachinery/pkg/api/apitesting/fuzzer"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
 	runtimeserializer "k8s.io/apimachinery/pkg/runtime/serializer"
 	"k8s.io/utils/ptr"
 	"sigs.k8s.io/randfill"
@@ -43,6 +45,18 @@ const (
 // Test is disabled when the race detector is enabled (via "//go:build !race" above) because otherwise the fuzz tests would just time out.
 
 func TestFuzzyConversion(t *testing.T) {
+	SetAPIVersionGetter(func(gk schema.GroupKind) (string, error) {
+		for _, gvk := range testGVKs {
+			if gvk.GroupKind() == gk {
+				return schema.GroupVersion{
+					Group:   gk.Group,
+					Version: gvk.Version,
+				}.String(), nil
+			}
+		}
+		return "", fmt.Errorf("failed to map GroupKind %s to version", gk.String())
+	})
+
 	t.Run("for KubeadmControlPlane", utilconversion.FuzzTestFunc(utilconversion.FuzzTestFuncInput{
 		Hub:         &controlplanev1.KubeadmControlPlane{},
 		Spoke:       &KubeadmControlPlane{},
@@ -57,7 +71,9 @@ func TestFuzzyConversion(t *testing.T) {
 
 func KubeadmControlPlaneFuzzFuncs(_ runtimeserializer.CodecFactory) []interface{} {
 	return []interface{}{
+		hubMachineTemplateSpec,
 		hubKubeadmControlPlaneStatus,
+		spokeKubeadmControlPlane,
 		spokeKubeadmControlPlaneStatus,
 		spokeKubeadmConfigSpec,
 		spokeClusterConfiguration,
@@ -116,6 +132,28 @@ func spokeBootstrapTokenString(in *bootstrapv1beta1.BootstrapTokenString, _ rand
 	in.Secret = fakeSecret
 }
 
+func hubMachineTemplateSpec(in *controlplanev1.KubeadmControlPlaneMachineTemplate, c randfill.Continue) {
+	c.FillNoCustom(in)
+
+	// Ensure ref field is always set to realistic values.
+	gvk := testGVKs[c.Int31n(4)]
+	in.InfrastructureRef.APIGroup = gvk.Group
+	in.InfrastructureRef.Kind = gvk.Kind
+}
+
+func spokeKubeadmControlPlane(in *KubeadmControlPlane, c randfill.Continue) {
+	c.FillNoCustom(in)
+
+	// Ensure ref fields are always set to realistic values.
+	gvk := testGVKs[c.Int31n(4)]
+	in.Spec.MachineTemplate.InfrastructureRef.APIVersion = gvk.GroupVersion().String()
+	in.Spec.MachineTemplate.InfrastructureRef.Kind = gvk.Kind
+	in.Spec.MachineTemplate.InfrastructureRef.Namespace = in.Namespace
+	in.Spec.MachineTemplate.InfrastructureRef.UID = ""
+	in.Spec.MachineTemplate.InfrastructureRef.ResourceVersion = ""
+	in.Spec.MachineTemplate.InfrastructureRef.FieldPath = ""
+}
+
 func hubKubeadmControlPlaneStatus(in *controlplanev1.KubeadmControlPlaneStatus, c randfill.Continue) {
 	c.FillNoCustom(in)
 	// Always create struct with at least one mandatory fields.
@@ -232,3 +270,26 @@ func spokeBootstrapToken(in *bootstrapv1beta1.BootstrapToken, c randfill.Continu
 		in.TTL = ptr.To[metav1.Duration](metav1.Duration{Duration: time.Duration(c.Int31()) * time.Second})
 	}
 }
+
+var testGVKs = []schema.GroupVersionKind{
+	{
+		Group:   "controlplane.cluster.x-k8s.io",
+		Version: "v1beta4",
+		Kind:    "KubeadmControlPlane",
+	},
+	{
+		Group:   "controlplane.cluster.x-k8s.io",
+		Version: "v1beta7",
+		Kind:    "AWSManagedControlPlane",
+	},
+	{
+		Group:   "infrastructure.cluster.x-k8s.io",
+		Version: "v1beta3",
+		Kind:    "DockerCluster",
+	},
+	{
+		Group:   "infrastructure.cluster.x-k8s.io",
+		Version: "v1beta6",
+		Kind:    "AWSCluster",
+	},
+}

api/controlplane/kubeadm/v1beta2/kubeadm_control_plane_types.go

@@ -17,7 +17,6 @@ limitations under the License.
 package v1beta2
 
 import (
-	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/intstr"
 
@@ -486,7 +485,7 @@ type KubeadmControlPlaneMachineTemplate struct {
 	// infrastructureRef is a required reference to a custom resource
 	// offered by an infrastructure provider.
 	// +required
-	InfrastructureRef corev1.ObjectReference `json:"infrastructureRef"`
+	InfrastructureRef clusterv1.ContractVersionedObjectReference `json:"infrastructureRef"`
 
 	// readinessGates specifies additional conditions to include when evaluating Machine Ready condition;
 	// KubeadmControlPlane will always add readinessGates for the condition it is setting on the Machine: