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change.go
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change.go
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/*
Copyright © 2020 NAME HERE <EMAIL ADDRESS>
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 cmd
import (
"fmt"
"github.com/spf13/cobra"
"k8s.io/client-go/tools/clientcmd"
)
var contextName = ""
// changeCmd represents the change command
var changeCmd = &cobra.Command{
Use: "change",
Aliases: []string{"c"},
Short: "change the current-context for kubernetes config ",
Long: `change the kubernetes current-context:
kct change --context-name=test [--sourcefile=~/.kube/config]
or
kct c -c test [-s ~/.kube/config]`,
Run: func(cmd *cobra.Command, args []string) {
changeCurrentContext()
},
}
func init() {
rootCmd.AddCommand(changeCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// changeCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// changeCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
changeCmd.Flags().StringVarP(&contextName, "context-name", "c", "", "the context will set to current use context")
}
func changeCurrentContext() {
config, err := clientcmd.LoadFromFile(defaultPath)
if err != nil {
fmt.Println("load the default kubernetes config file error", err)
return
}
if contextName == "" {
fmt.Println("not set the context you want to change to,if you don't know all context see below")
listCurrentKubernetesContext()
return
}
var contexts []string
for key := range config.Contexts {
contexts = append(contexts, key)
}
isContain := false
for _, item := range contexts {
if contextName == item {
isContain = true
}
}
if !isContain {
fmt.Println("not found the context you want to set,current config info please see below")
listCurrentKubernetesContext()
return
}
config.CurrentContext = contextName
err = clientcmd.WriteToFile(*config, defaultPath)
if err != nil {
fmt.Println(fmt.Sprintf("write file to %s error", defaultPath), err)
return
}
fmt.Println(fmt.Sprintf("change current context to %s success", contextName))
}