Replace godep with dep

vendor/k8s.io/kubernetes/cmd/kubeadm/app/node/validate.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2017 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 node
+
+import (
+	"fmt"
+
+	certsapi "k8s.io/api/certificates/v1beta1"
+	clientset "k8s.io/client-go/kubernetes"
+)
+
+// ValidateAPIServer makes sure the server we're connecting to supports the Beta Certificates API
+func ValidateAPIServer(client clientset.Interface) error {
+	version, err := client.Discovery().ServerVersion()
+	if err != nil {
+		return fmt.Errorf("failed to check server version: %v", err)
+	}
+	fmt.Printf("[bootstrap] Detected server version: %s\n", version.String())
+
+	// Check certificates API. If the server supports the version of the Certificates API we're using, we're good to go
+	serverGroups, err := client.Discovery().ServerGroups()
+	if err != nil {
+		return fmt.Errorf("certificate API check failed: failed to retrieve a list of supported API objects [%v]", err)
+	}
+	for _, group := range serverGroups.Groups {
+		if group.Name == certsapi.SchemeGroupVersion.Group {
+			for _, version := range group.Versions {
+				if version.Version == certsapi.SchemeGroupVersion.Version {
+					fmt.Printf("[bootstrap] The server supports the Certificates API (%s/%s)\n", certsapi.SchemeGroupVersion.Group, certsapi.SchemeGroupVersion.Version)
+					return nil
+				}
+			}
+		}
+	}
+	return fmt.Errorf("certificate API check failed: API server with version %s doesn't support Certificates API (%s/%s), use v1.6.0 or newer",
+		version.String(), certsapi.SchemeGroupVersion.Group, certsapi.SchemeGroupVersion.Version)
+}