Support Helm

[dylanratcliffe]

Helm is built on top of kubernetes and doesn't actually create kubernetes objects. In order to read helm info we will need to use the helm Go libraries: https://pkg.go.dev/helm.sh/helm

GPT-4 suggests that we can query helm releases as follows:

package main

import (
    "log"
	"os"
	"helm.sh/helm/v3/pkg/action"
	"helm.sh/helm/v3/pkg/cli"
	"k8s.io/client-go/tools/clientcmd"
	"fmt"
)

func main() {
	helmDriver := os.Getenv("HELM_DRIVER")
	settings := cli.New()

	actionConfig := new(action.Configuration)
	kubeconfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
		clientcmd.NewDefaultClientConfigLoadingRules(),
		&clientcmd.ConfigOverrides{},
	)
	namespace, _, _ := kubeconfig.Namespace()
	err := actionConfig.Init(settings.RESTClientGetter(), namespace, helmDriver, func(format string, v ...interface{}) {
		fmt.Sprintf(format, v)
	})

	if err != nil {
		log.Fatalf("Failed to connect to Kubernetes: %v", err)
	}

	// create a new List action
	listAction := action.NewList(actionConfig)
	
    // set the namespace if needed - default it's "", which lists releases across all namespaces
    listAction.AllNamespaces = true
	
    // retrieve releases
	releases, err := listAction.Run()
	if err != nil {
		log.Fatalf("Failed to retrieve releases: %v", err)
	}

	// print release name
	for _, rls := range releases {
		fmt.Println(rls.Name)
	}
}