UPSTREAM: <carry>: Move Group informer configuration into RestrictSubjectBindings

admission plugin initialization to prevent Group informers being configured when
the plugin is disabled. This is necessary for when the OpenShift OAuth stack
is not present and the plugin is disabled as part of that.

Signed-off-by: Bryce Palmer <[email protected]>

Author: everettraven

openshift-kube-apiserver/admission/authorization/restrictusers/restrictusers.go

@@ -13,6 +13,7 @@ import (
 	"k8s.io/apiserver/pkg/admission/initializer"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/cache"
 	"k8s.io/klog/v2"
 	"k8s.io/kubernetes/pkg/apis/rbac"
 
@@ -87,6 +88,12 @@ func (q *restrictUsersAdmission) SetRESTClientConfig(restClientConfig rest.Confi
 }
 
 func (q *restrictUsersAdmission) SetUserInformer(userInformers userinformer.SharedInformerFactory) {
+	if err := userInformers.User().V1().Groups().Informer().AddIndexers(cache.Indexers{
+		usercache.ByUserIndexName: usercache.ByUserIndexKeys,
+	}); err != nil {
+		utilruntime.HandleError(err)
+		return
+	}
 	q.groupCache = usercache.NewGroupCache(userInformers.User().V1().Groups())
 }
 

openshift-kube-apiserver/openshiftkubeapiserver/patch.go

@@ -27,9 +27,7 @@ import (
 	clientgoinformers "k8s.io/client-go/informers"
 	corev1informers "k8s.io/client-go/informers/core/v1"
 	"k8s.io/client-go/rest"
-	"k8s.io/client-go/tools/cache"
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/authorization/restrictusers"
-	"k8s.io/kubernetes/openshift-kube-apiserver/admission/authorization/restrictusers/usercache"
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/autoscaling/managednode"
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/autoscaling/managementcpusoverride"
 	"k8s.io/kubernetes/openshift-kube-apiserver/admission/scheduler/nodeenv"
@@ -176,11 +174,6 @@ func newInformers(loopbackClientConfig *rest.Config) (*kubeAPIServerInformers, e
 		OpenshiftUserInformers:     userinformer.NewSharedInformerFactory(userClient, defaultInformerResyncPeriod),
 		OpenshiftConfigInformers:   configv1informer.NewSharedInformerFactory(configClient, defaultInformerResyncPeriod),
 	}
-	if err := ret.OpenshiftUserInformers.User().V1().Groups().Informer().AddIndexers(cache.Indexers{
-		usercache.ByUserIndexName: usercache.ByUserIndexKeys,
-	}); err != nil {
-		return nil, err
-	}
 
 	return ret, nil
 }