Implement utils package.

pkg/utils/utils.go

@@ -0,0 +1,40 @@
+/*
+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 utils
+
+import (
+	"fmt"
+
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+func GetMasterFromKubeconfig(filename string) (string, error) {
+	config, err := clientcmd.LoadFromFile(filename)
+	if err != nil {
+		return "", err
+	}
+
+	context, ok := config.Contexts[config.CurrentContext]
+	if !ok {
+		return "", fmt.Errorf("Failed to get master address from kubeconfig")
+	}
+
+	if val, ok := config.Clusters[context.Cluster]; ok {
+		return val.Server, nil
+	}
+	return "", fmt.Errorf("Failed to get master address from kubeconfig")
+}