package main

import (
	"encoding/json"
	"fmt"

	jsonpatch "github.com/evanphx/json-patch"

	corev1 "k8s.io/api/core/v1"

)

func main()  {

	var pod = corev1.Pod{

		Spec:       corev1.PodSpec{
			Volumes: []corev1.Volume{
				{
					Name: "default-token-lsh6v",
					VolumeSource: corev1.VolumeSource{
						Secret: &corev1.SecretVolumeSource{
							SecretName: "default-token-lsh6v",
						},
					},
				},
			},
		},
	}


	podBytes, _ := json.Marshal(&pod)

	fmt.Printf("old document: %s\n", podBytes)
	// 		{"op": "add", "path": "/spec/dnsConfig/options", "value": [{"name":"single-request-reopen"}]}

	patchJSON := []byte(`[
		{"op": "add", "path": "/spec", "value": {"dnsConfig": {"options":[{"name":"single-request-reopen"}] }}   },
		{"op": "add", "path": "/spec/volumes/0", "value": 
			 {
				"name":"default-token-lsh6v1111",
				"secret":{
				   "secretName":"default-token-lsh6v1111"
				}
			 }
         }

	]`)

	patch, err := jsonpatch.DecodePatch(patchJSON)
	if err != nil {
		panic(err)
	}

	modified, err := patch.Apply(podBytes)
	if err != nil {
		panic(err)
	}

	fmt.Printf("Modified document: %s\n", modified)

}