helmclient

// Define a private chart repository
chartRepo := repo.Entry{
	Name:     "stable",
	URL:      "https://private-chartrepo.somedomain.com",
	Username: "foo",
	Password: "bar",
	// Since helm 3.6.1 it is necessary to pass PassCredentialsAll = true
	PassCredentialsAll: true,
}

// Add a chart-repository to the client
if err := helmClient.AddOrUpdateChartRepo(chartRepo); err != nil {
	panic(err)
}

// Define a public chart repository
chartRepo := repo.Entry{
	Name: "stable",
	URL:  "https://kubernetes-charts.storage.googleapis.com",
}

// Add a chart-repository to the client
if err := helmClient.AddOrUpdateChartRepo(chartRepo); err != nil {
	panic(err)
}

// Define the chart to be deleted from the client's cache
chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
}

if err := helmClient.DeleteChartFromCache(&chartSpec); err != nil {
	panic(err)
}

if _, err := helmClient.GetRelease("etcd-operator"); err != nil {
	panic(err)
}

if _, err := helmClient.GetReleaseValues("etcd-operator", true); err != nil {
	panic(err)
}

// Define the chart to be installed
chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
}

if err, _ := helmClient.InstallOrUpgradeChart(context.Background(), &chartSpec); err != nil {
	panic(err)
}

// Define a chart with custom values to be tested
chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
	ValuesYaml: `deployments:
  etcdOperator: true
  backupOperator: false`,
}

if err := helmClient.LintChart(&chartSpec); err != nil {
	panic(err)
}

if _, err := helmClient.ListDeployedReleases(); err != nil {
	panic(err)
}

// Define the released chart to be installed
chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
}

// Rollback to the previous version of the release by setting the release version to '0'.
if err := helmClient.RollbackRelease(&chartSpec, 0); err != nil {
	return
}

chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
	ValuesYaml: `deployments:
  etcdOperator: true
  backupOperator: false`,
}

_, err := helmClient.TemplateChart(&chartSpec)
if err != nil {
	panic(err)
}

// Define the released chart to be installed
chartSpec := ChartSpec{
	ReleaseName: "etcd-operator",
	ChartName:   "stable/etcd-operator",
	Namespace:   "default",
	UpgradeCRDs: true,
	Wait:        true,
}

if err := helmClient.UninstallRelease(&chartSpec); err != nil {
	panic(err)
}

if err := helmClient.UninstallReleaseByName("etcd-operator"); err != nil {
	panic(err)
}

if err := helmClient.UpdateChartRepos(); err != nil {
	panic(err)
}