func operator --create-config option to create default configmap

cmd/func-operator/main.go

@@ -81,6 +81,7 @@ type cliFlags struct {
 	funcCLIPath          string
 	funcCLICheckInterval time.Duration
 	disableFuncCLIUpdate bool
+	createConfig         bool
 }
 
 func parseFlags() cliFlags {
@@ -108,6 +109,8 @@ func parseFlags() cliFlags {
 	flag.DurationVar(&flags.funcCLICheckInterval, "func-cli-check-interval", 5*time.Minute,
 		"How often to check for new func CLI versions")
 	flag.BoolVar(&flags.disableFuncCLIUpdate, "disable-func-cli-update", false, "Disable the function-cli update")
+	flag.BoolVar(&flags.createConfig, "create-config", false,
+		"If set, create the default controller-config ConfigMap at startup if it does not already exist.")
 	opts := zap.Options{
 		Development: true,
 	}
@@ -304,6 +307,18 @@ func main() {
 	metricsServerOptions := setupMetricsServerOptions(flags.metricsAddr, flags.secureMetrics, metricsCertWatcher, tlsOpts)
 
 	operatorNamespace := getOperatorNamespace()
+
+	// Optionally create the default controller-config ConfigMap before the manager
+	// starts. This is used when deploying via OLM, where the default ConfigMap is
+	// not part of the bundle. When deploying via the config/ manifests, the
+	// ConfigMap is managed there and this flag is left unset.
+	if flags.createConfig {
+		if err := controller.EnsureDefaultConfigMap(context.Background(), operatorNamespace); err != nil {
+			setupLog.Error(err, "failed to ensure default controller-config ConfigMap")
+			os.Exit(1)
+		}
+	}
+
 	cacheOpts := setupCacheOptions(operatorNamespace)
 
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{

internal/controller/controller_config.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2025.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"context"
+	"fmt"
+
+	v1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/log"
+)
+
+// defaultAutoUpdateMiddleware mirrors the value shipped in
+// config/manager/manager.yaml. It is used when creating the controller-config
+// ConfigMap for deployments that do not provide one (e.g. OLM bundles that omit
+// the default ConfigMap).
+const defaultAutoUpdateMiddleware = "true"
+
+// EnsureDefaultConfigMap creates the controller-config ConfigMap with default
+// values if it does not already exist. It is a no-op when the ConfigMap is
+// already present. This allows the operator to be deployed via OLM, where the
+// default ConfigMap is not part of the bundle.
+func EnsureDefaultConfigMap(ctx context.Context, namespace string) error {
+	clientset, err := kubernetes.NewForConfig(ctrl.GetConfigOrDie())
+	if err != nil {
+		return fmt.Errorf("creating kubernetes clientset: %w", err)
+	}
+
+	_, err = clientset.CoreV1().ConfigMaps(namespace).Get(ctx, controllerConfigName, metav1.GetOptions{})
+	if err == nil {
+		log.Log.Info("controller-config ConfigMap already exists, not creating",
+			"name", controllerConfigName, "namespace", namespace)
+		return nil
+	}
+	if !apierrors.IsNotFound(err) {
+		return fmt.Errorf("checking for ConfigMap %s/%s: %w", namespace, controllerConfigName, err)
+	}
+
+	cm := &v1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      controllerConfigName,
+			Namespace: namespace,
+		},
+		Data: map[string]string{
+			"autoUpdateMiddleware": defaultAutoUpdateMiddleware,
+		},
+	}
+
+	if _, err := clientset.CoreV1().ConfigMaps(namespace).Create(ctx, cm, metav1.CreateOptions{}); err != nil {
+		if apierrors.IsAlreadyExists(err) {
+			// Another replica created it concurrently; treat as success.
+			log.Log.Info("controller-config ConfigMap already created concurrently",
+				"name", controllerConfigName, "namespace", namespace)
+			return nil
+		}
+		return fmt.Errorf("creating default ConfigMap %s/%s: %w", namespace, controllerConfigName, err)
+	}
+
+	log.Log.Info("created default controller-config ConfigMap",
+		"name", controllerConfigName, "namespace", namespace)
+	return nil
+}

internal/controller/function_controller.go

@@ -70,7 +70,7 @@ type FunctionReconciler struct {
 // +kubebuilder:rbac:groups=functions.dev,resources=functions/status,verbs=get;update;patch
 // +kubebuilder:rbac:groups=functions.dev,resources=functions/finalizers,verbs=update
 // +kubebuilder:rbac:groups="",resources=pods;pods/attach;secrets;services;persistentvolumeclaims,verbs=get;list;watch;create;update;patch;delete
-// +kubebuilder:rbac:groups="",resources=configmaps,verbs=get;list;watch
+// +kubebuilder:rbac:groups="",resources=configmaps,verbs=get;list;watch;create
 // +kubebuilder:rbac:groups="apps",resources=deployments;replicasets,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups="serving.knative.dev",resources=services;routes,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups="eventing.knative.dev",resources=triggers,verbs=get;list;watch;create;update;patch;delete