add kubectl config

pkg/kubectl/cmd/config/view.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 config
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/ghodss/yaml"
+	"github.com/spf13/cobra"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd"
+	clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
+)
+
+type viewOptions struct {
+	pathOptions *pathOptions
+	merge       bool
+}
+
+func NewCmdConfigView(out io.Writer, pathOptions *pathOptions) *cobra.Command {
+	options := &viewOptions{pathOptions: pathOptions}
+
+	cmd := &cobra.Command{
+		Use:   "view",
+		Short: "displays the specified .kubeconfig file or a merged result",
+		Long:  `displays the specified .kubeconfig file or a merged result`,
+		Run: func(cmd *cobra.Command, args []string) {
+			err := options.run()
+			if err != nil {
+				fmt.Printf("%v\n", err)
+			}
+		},
+	}
+
+	cmd.Flags().BoolVar(&options.merge, "merge", false, "merge together the full hierarchy of .kubeconfig files")
+
+	return cmd
+}
+
+func (o viewOptions) run() error {
+	err := o.validate()
+	if err != nil {
+		return err
+	}
+
+	config, _, err := o.getStartingConfig()
+	if err != nil {
+		return err
+	}
+
+	content, err := yaml.Marshal(config)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%v", string(content))
+
+	return nil
+}
+
+func (o viewOptions) validate() error {
+	return nil
+}
+
+// getStartingConfig returns the Config object built from the sources specified by the options, the filename read (only if it was a single file), and an error if something goes wrong
+func (o *viewOptions) getStartingConfig() (*clientcmdapi.Config, string, error) {
+	switch {
+	case o.merge:
+		loadingRules := clientcmd.NewClientConfigLoadingRules()
+		loadingRules.EnvVarPath = ""
+		loadingRules.CommandLinePath = o.pathOptions.specifiedFile
+
+		overrides := &clientcmd.ConfigOverrides{}
+		clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, overrides)
+
+		config, err := clientConfig.RawConfig()
+		if err != nil {
+			return nil, "", fmt.Errorf("Error getting config: %v", err)
+		}
+		return &config, "", nil
+	default:
+		return o.pathOptions.getStartingConfig()
+	}
+}