poc of helm without tiller or the helm cli. render charts in a go function

helmwithouttiller.go

package helm

import (
	"fmt"
	"github.com/solo-io/go-utils/errors"
	"k8s.io/helm/pkg/chartutil"
	"k8s.io/helm/pkg/proto/hapi/chart"
	"k8s.io/helm/pkg/renderutil"
	"k8s.io/helm/pkg/timeconv"
)

var defaultKubeVersion = fmt.Sprintf("%s.%s", chartutil.DefaultKubeVersion.Major, chartutil.DefaultKubeVersion.Minor)

func RenderTemplate(chartPath, values, releaseName, namespace, kubeVersion string, releaseIsInstall bool) (map[string]string, error) {
	if kubeVersion == "" {
		kubeVersion = defaultKubeVersion
	}
	renderOpts := renderutil.Options{
		ReleaseOptions: chartutil.ReleaseOptions{
			Name:      releaseName,
			IsInstall: releaseIsInstall,
			IsUpgrade: !releaseIsInstall,
			Time:      timeconv.Now(),
			Namespace: namespace,
		},
		KubeVersion: kubeVersion,
	}

	// Check chart requirements to make sure all dependencies are present in /charts
	c, err := chartutil.Load(chartPath)
	if err != nil {
		return nil, errors.Wrapf(err, "loading chart")
	}

	config := &chart.Config{Raw: values, Values: map[string]*chart.Value{}}
	renderedTemplates, err := renderutil.Render(c, config, renderOpts)
	if err != nil {
		return nil, err
	}

	return renderedTemplates, nil
}