Install chart using go-sdk

helm-crud.go

// https://github.com/helm/helm/issues/7310
// https://github.com/helm/helm/issues/12931
// helm 3.0.2 SDK - example of install from remote repository #7310

// https://github.com/helm/helm/issues/12907
// https://github.com/helm/helm-www/pull/1543

import (
	"log"
	"os"

	"helm.sh/helm/v3/pkg/action"
	"helm.sh/helm/v3/pkg/chart"
	"helm.sh/helm/v3/pkg/chart/loader"
	"helm.sh/helm/v3/pkg/cli"
	"helm.sh/helm/v3/pkg/release"
	"helm.sh/helm/v3/pkg/storage/driver"
)

func installOrUpgradeRelease(releaseName string, repoUrl string, chartName string, values map[string]interface{}, targetNamespace string) (*release.Release, error) {
	actionConfig, settings, err := createActionConfig(targetNamespace)
	if err != nil {
		return nil, err
	}

	var chartPathOptions action.ChartPathOptions = action.ChartPathOptions{
		RepoURL: repoUrl,
	}

	chart, err := getChart(chartPathOptions, chartName, settings)
	if err != nil {
		return nil, err
	}

	var rel *release.Release
	var requestError error

	histClient := action.NewHistory(actionConfig)
	histClient.Max = 1
	if _, err := histClient.Run(releaseName); err == driver.ErrReleaseNotFound {
		clientInstall := action.NewInstall(actionConfig)
		clientInstall.ReleaseName = releaseName
		clientInstall.Namespace = targetNamespace
		clientInstall.ChartPathOptions = chartPathOptions

		rel, requestError = clientInstall.Run(chart, values)
	} else {
		clientUpgrade := action.NewUpgrade(actionConfig)
		clientUpgrade.Namespace = targetNamespace
		clientUpgrade.ChartPathOptions = chartPathOptions

		rel, requestError = clientUpgrade.Run(releaseName, chart, values)
	}

	return rel, requestError
}

func createActionConfig(targetNamespace string) (*action.Configuration, *cli.EnvSettings, error) {
	settings := cli.New()
	actionConfig := new(action.Configuration)
	err := actionConfig.Init(settings.RESTClientGetter(), targetNamespace, os.Getenv("HELM_DRIVER"), log.Printf)

	return actionConfig, settings, err
}

func getChart(chartPathOption action.ChartPathOptions, chartName string, settings *cli.EnvSettings) (*chart.Chart, error) {
	chartPath, err := chartPathOption.LocateChart(chartName, settings)
	if err != nil {
		return nil, err
	}

	chart, err := loader.Load(chartPath)
	if err != nil {
		return nil, err
	}

	return chart, nil
}