kubeadm: Upload CRISocket information and hence make kubeadm join blocking

cmd/kubeadm/app/phases/patchnode/patchnode.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 patchnode
+
+import (
+	"fmt"
+
+	"k8s.io/api/core/v1"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/cmd/kubeadm/app/constants"
+	"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
+)
+
+// AnnotateCRISocket annotates the node with the given crisocket
+func AnnotateCRISocket(client clientset.Interface, nodeName string, criSocket string) error {
+
+	fmt.Printf("[patchnode] Uploading the CRI Socket information %q to the Node API object %q as an annotation\n", criSocket, nodeName)
+
+	return apiclient.PatchNode(client, nodeName, func(n *v1.Node) {
+		annotateNodeWithCRISocket(n, criSocket)
+	})
+}
+
+func annotateNodeWithCRISocket(n *v1.Node, criSocket string) {
+	n.ObjectMeta.Annotations[constants.AnnotationKubeadmCRISocket] = criSocket
+}