Drop Helm v2 support (#613)

Resolves #589

Signed-off-by: xiaomudk <xiaomudk@gmail.com>

pkg/helmexec/context.go

@@ -2,43 +2,10 @@ package helmexec
 
 import (
 	"io"
-	"os"
-	"path/filepath"
 )
 
 type HelmContext struct {
-	Tillerless      bool
-	TillerNamespace string
-	HistoryMax      int
-	WorkerIndex     int
-	Writer          io.Writer
-}
-
-func (context *HelmContext) GetTillerlessArgs(helm *execer) []string {
-	if context.Tillerless && !helm.IsHelm3() {
-		if context.TillerNamespace != "" {
-			return []string{"tiller", "run", context.TillerNamespace, "--", helm.helmBinary}
-		}
-		return []string{"tiller", "run", "--", helm.helmBinary}
-	}
-	return []string{}
-}
-
-func (context *HelmContext) getTillerlessEnv() map[string]string {
-	if context.Tillerless {
-		result := map[string]string{
-			"HELM_TILLER_SILENT": "true",
-			// Changing the TILLER port doesn't really work: https://github.com/helm/helm/issues/3159
-			// So this is not used for the moment.
-			// "HELM_TILLER_PORT":   strconv.Itoa(44134 + context.WorkerIndex),
-		}
-		if config := os.Getenv("KUBECONFIG"); config != "" {
-			absConfig, err := filepath.Abs(config)
-			if err == nil {
-				result["KUBECONFIG"] = absConfig
-			}
-		}
-		return result
-	}
-	return map[string]string{}
+	HistoryMax  int
+	WorkerIndex int
+	Writer      io.Writer
 }