add hotfix

Author: OliverMKing

pkg/controller/nginx/nginx.go

@@ -1,11 +1,16 @@
 package nginx
 
 import (
+	"context"
+
 	"github.com/Azure/aks-app-routing-operator/pkg/config"
 	"github.com/Azure/aks-app-routing-operator/pkg/controller/ingress"
 	"github.com/Azure/aks-app-routing-operator/pkg/controller/service"
 	"github.com/Azure/aks-app-routing-operator/pkg/manifests"
 	appsv1 "k8s.io/api/apps/v1"
+	k8serrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
 )
@@ -19,12 +24,30 @@ type nginx struct {
 	defaultIngConfig *manifests.NginxIngressConfig
 }
 
+const (
+	defaultIcName = "webapprouting.kubernetes.azure.com"
+)
+
 // New starts all resources required for provisioning Nginx ingresses and the configs used for those ingresses
 func New(m manager.Manager, conf *config.Config, self *appsv1.Deployment) ([]*manifests.NginxIngressConfig, error) {
+	kcs, err := kubernetes.NewForConfig(m.GetConfig()) // need to use config since manager hasn't started yet
+	if err != nil {
+		return nil, err
+	}
+
+	defaultControllerClass := "webapprouting.kubernetes.azure.com/nginx"
+	defaultIc, err := kcs.NetworkingV1().IngressClasses().Get(context.Background(), defaultIcName, metav1.GetOptions{})
+	if err == nil {
+		defaultControllerClass = defaultIc.Spec.Controller
+	}
+	if err != nil && !k8serrors.IsNotFound(err) {
+		return nil, err
+	}
+
 	defaultIngConfig := &manifests.NginxIngressConfig{
-		ControllerClass: "webapprouting.kubernetes.azure.com/nginx",
+		ControllerClass: defaultControllerClass,
 		ResourceName:    "nginx",
-		IcName:          "webapprouting.kubernetes.azure.com",
+		IcName:          defaultIcName,
 	}
 
 	// TODO: re-add for dynamic provisioning, until then serviceConfig is nil