kustomize-set-image.go

package main

import (
	"io/ioutil"

	"gopkg.in/yaml.v2"
)

type config struct {
	APIVersion            string   `yaml:"apiVersion"`
	Kind                  string   `yaml:"kind"`
	PatchesStrategicMerge []string `yaml:"patchesStrategicMerge"`
	Images                []Images `yaml:"images"`
	Resources             []string `yaml:"resources"`
}
type Images struct {
	Name    string `yaml:"name"`
	NewName string `yaml:"newName"`
	NewTag  string `yaml:"newTag"`
}

func main() {

	var apa config
	f, err := ioutil.ReadFile("kustomize.yaml")
	if err != nil {
		panic(err)
	}

	err = yaml.Unmarshal(f, &apa)

	if err != nil {
		panic(err)
	}
	apa.Images[0].NewTag = "abc123"

	newyaml, err := yaml.Marshal(apa)
	if err != nil {
		panic(err)
	}

	err = ioutil.WriteFile("kustomize.yaml", newyaml, 0644)
	if err != nil {
		panic(err)
	}
}