Read and write Kubernetes client config (~/.kube/config) in Go

main.go

package main

import (
	"log"
	"os"

	"github.com/mitchellh/go-homedir"
	"k8s.io/client-go/tools/clientcmd"
)

func main() {
	kubeConfigPath, err := findKubeConfig()
	if err != nil {
		log.Fatal(err)
	}

	kubeConfig, err := clientcmd.LoadFromFile(kubeConfigPath)
	if err != nil {
		log.Fatal(err)
	}

	log.Printf("current context is %s", kubeConfig.CurrentContext)

	err = clientcmd.WriteToFile(*kubeConfig, "copy.yaml")
	if err != nil {
		log.Fatal(err)
	}
}

// findKubeConfig finds path from env:KUBECONFIG or ~/.kube/config
func findKubeConfig() (string, error) {
	env := os.Getenv("KUBECONFIG")
	if env != "" {
		return env, nil
	}
	path, err := homedir.Expand("~/.kube/config")
	if err != nil {
		return "", err
	}
	return path, nil
}