Force reinstall of operator resources on release version upgrade

Fixes upgrade failures from 0.4 to main caused by incompatible webhook
configuration changes that trigger index out of range panics during
manifest merging.

When OPENSTACK_RELEASE_VERSION is bumped, the controller now:
  - Detects the version change by comparing against status.ReleaseVersion
  - Deletes all owned resources (deployments, services, serviceaccounts, configmaps)
  - Removes managed webhooks (validating and mutating configurations)
  - Requeues to recreate resources with new manifests

This one-time cleanup ensures a clean slate for incompatible upgrades
where the structure of resources (especially webhooks) has changed between
versions.

Adds ReleaseVersion field to OpenStackStatus to track the deployed version.

Also, adds bounds checking to skip copying clientConfig for new webhooks
that don't exist in the current configuration, allowing the merge to
complete successfully.

Jira: OSPRH-23865

Co-authored-by: Brendan Shephard <bshephar@fedora-g16.bne-home.net>

Author: dprince

api/bases/operator.openstack.org_openstacks.yaml

@@ -268,6 +268,10 @@ spec:
                   for this object.
                 format: int64
                 type: integer
+              releaseVersion:
+                description: ReleaseVersion - the OpenStack release version that has
+                  been successfully deployed
+                type: string
               totalOperatorCount:
                 description: TotalOperatorCount - the number all operators available
                 type: integer

api/operator/v1beta1/openstack_types.go

@@ -256,6 +256,9 @@ type OpenStackStatus struct {
 
 	// ContainerImage - the container image that has been successfully deployed
 	ContainerImage *string `json:"containerImage,omitempty"`
+
+	// ReleaseVersion - the OpenStack release version that has been successfully deployed
+	ReleaseVersion *string `json:"releaseVersion,omitempty"`
 }
 
 // +kubebuilder:object:root=true

api/operator/v1beta1/zz_generated.deepcopy.go

@@ -268,6 +268,10 @@ spec:
                   for this object.
                 format: int64
                 type: integer
+              releaseVersion:
+                description: ReleaseVersion - the OpenStack release version that has
+                  been successfully deployed
+                type: string
               totalOperatorCount:
                 description: TotalOperatorCount - the number all operators available
                 type: integer

config/crd/bases/operator.openstack.org_openstacks.yaml

@@ -43,6 +43,7 @@ import (
 	"github.com/openstack-k8s-operators/openstack-operator/internal/operator"
 	"github.com/openstack-k8s-operators/openstack-operator/internal/operator/bindata"
 	"github.com/pkg/errors"
+	admissionv1 "k8s.io/api/admissionregistration/v1"
 	appsv1 "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
 	discoveryv1 "k8s.io/api/discovery/v1"
@@ -250,6 +251,48 @@ func (r *OpenStackReconciler) Reconcile(ctx context.Context, req ctrl.Request) (
 		return ctrl.Result{}, err
 	}
 
+	// Check if OPENSTACK_RELEASE_VERSION has changed - if so, delete all owned resources
+	// This is a one-time fix to handle incompatible upgrades
+	shouldReinstall := false
+	if instance.Status.ReleaseVersion != nil && *instance.Status.ReleaseVersion != openstackReleaseVersion {
+		// Explicit version change detected
+		shouldReinstall = true
+	} else if !isNewInstance && instance.Status.ReleaseVersion == nil {
+		// Existing installation upgrading from version without ReleaseVersion field
+		shouldReinstall = true
+	}
+
+	if shouldReinstall {
+		Log.Info("OpenStack release version changed, deleting all owned resources",
+			"old", instance.Status.ReleaseVersion,
+			"new", openstackReleaseVersion)
+
+		if err := r.deleteAllOwnedResources(ctx, instance); err != nil {
+			instance.Status.Conditions.Set(condition.FalseCondition(
+				operatorv1beta1.OpenStackOperatorReadyCondition,
+				condition.ErrorReason,
+				condition.SeverityWarning,
+				operatorv1beta1.OpenStackOperatorErrorMessage,
+				err))
+			return ctrl.Result{}, err
+		}
+
+		// Reset the container image status to force re-application of CRDs and RBAC
+		instance.Status.ContainerImage = nil
+
+		// Update the release version in status
+		instance.Status.ReleaseVersion = &openstackReleaseVersion
+
+		// Requeue to allow resources to be deleted before recreating
+		Log.Info("Resources deleted, requeuing to recreate with new version")
+		return ctrl.Result{RequeueAfter: time.Duration(5) * time.Second}, nil
+	}
+
+	// Set the release version if not set (for new installations only)
+	if instance.Status.ReleaseVersion == nil {
+		instance.Status.ReleaseVersion = &openstackReleaseVersion
+	}
+
 	if err := r.applyManifests(ctx, instance); err != nil {
 		instance.Status.Conditions.Set(condition.FalseCondition(
 			operatorv1beta1.OpenStackOperatorReadyCondition,
@@ -316,6 +359,69 @@ func (r *OpenStackReconciler) Reconcile(ctx context.Context, req ctrl.Request) (
 
 }
 
+func deleteOwnedResources[L client.ObjectList, T any](
+	ctx context.Context,
+	r *OpenStackReconciler,
+	instance client.Object,
+	list L,
+	itemsGetter func(L) []T,
+) error {
+	log := r.GetLogger(ctx)
+
+	err := r.List(ctx, any(list).(client.ObjectList), &client.ListOptions{Namespace: instance.GetNamespace()})
+	if err != nil {
+		return errors.Wrap(err, "failed to list resources")
+	}
+
+	for _, item := range itemsGetter(list) {
+		obj := any(&item).(client.Object)
+		if metav1.IsControlledBy(obj, instance) {
+			log.Info("Deleting owned resource", "kind", obj.GetObjectKind().GroupVersionKind().Kind, "name", obj.GetName())
+			err := r.Delete(ctx, obj)
+			if err != nil && !apierrors.IsNotFound(err) {
+				return errors.Wrapf(err, "failed to delete %s", obj.GetName())
+			}
+		}
+	}
+	return nil
+}
+
+func (r *OpenStackReconciler) deleteAllOwnedResources(ctx context.Context, instance *operatorv1beta1.OpenStack) error {
+	Log := r.GetLogger(ctx)
+	Log.Info("Deleting all owned resources for release version upgrade")
+
+	err := deleteOwnedResources(ctx, r, instance, &appsv1.DeploymentList{}, func(l *appsv1.DeploymentList) []appsv1.Deployment { return l.Items })
+	if err != nil {
+		return err
+	}
+
+	err = deleteOwnedResources(ctx, r, instance, &corev1.ServiceAccountList{}, func(l *corev1.ServiceAccountList) []corev1.ServiceAccount { return l.Items })
+	if err != nil {
+		return err
+	}
+
+	err = deleteOwnedResources(ctx, r, instance, &corev1.ServiceList{}, func(l *corev1.ServiceList) []corev1.Service { return l.Items })
+	if err != nil {
+		return err
+	}
+
+	labelSelector, _ := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
+		MatchLabels: map[string]string{"openstack.openstack.org/managed": "true"},
+	})
+
+	deleteOpts := client.DeleteAllOfOptions{
+		ListOptions: client.ListOptions{LabelSelector: labelSelector},
+	}
+
+	err = r.DeleteAllOf(ctx, &admissionv1.ValidatingWebhookConfiguration{}, &deleteOpts)
+	if err != nil && !apierrors.IsNotFound(err) {
+		return errors.Wrap(err, "failed to delete validating webhooks")
+	}
+
+	Log.Info("All owned resources deleted successfully")
+	return nil
+}
+
 func (r *OpenStackReconciler) reconcileDelete(ctx context.Context, instance *operatorv1beta1.OpenStack, helper *helper.Helper) (ctrl.Result, error) {
 	Log := r.GetLogger(ctx)
 	Log.Info("Reconciling OpenStack initialization resource delete")
@@ -987,7 +1093,7 @@ func (r *OpenStackReconciler) postCleanupObsoleteResources(ctx context.Context,
 				// The horizon-operator.openstack-operators has references to old roles/bindings
 				// the code below will delete those references before continuing
 				for _, ref := range refs {
-					refData := ref.(map[string]interface{})
+					refData := ref.(map[string]any)
 					Log.Info("Deleting operator reference", "Reference", ref)
 					obj := uns.Unstructured{}
 					obj.SetName(refData["name"].(string))

internal/controller/operator/openstack_controller.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package util
+package util //nolint:revive // util is an acceptable package name in this context
 
 import (
 	"context"

internal/dataplane/util/image_registry_test.go

@@ -60,10 +60,18 @@ func MergeWebhookConfigurationForUpdate(current, updated *uns.Unstructured) erro
 	gvk := updated.GroupVersionKind()
 
 	if gvk.Group == "admissionregistration.k8s.io" && (gvk.Kind == "MutatingWebhookConfiguration" || gvk.Kind == "ValidatingWebhookConfiguration") {
+		currentWebhooks, currentExists := current.Object["webhooks"].([]interface{})
+		if !currentExists {
+			return nil
+		}
 
 		for i, webhook := range updated.Object["webhooks"].([]interface{}) {
+			// Check if the index exists in the current webhooks list
+			if i >= len(currentWebhooks) {
+				continue
+			}
 
-			currentClientConfig := current.Object["webhooks"].([]interface{})[i].(map[string]interface{})["clientConfig"].(map[string]interface{})
+			currentClientConfig := currentWebhooks[i].(map[string]interface{})["clientConfig"].(map[string]interface{})
 			if currentClientConfig != nil {
 				webhook.(map[string]interface{})["clientConfig"] = currentClientConfig
 			}