feat(cmd): use alt dest for chart export

The adds the -d flag to "helm chart export" to save chart to different
directory.

Also, allow loading with "helm chart save" from both dir and tarball, as
well as make expirimental error more copy-paste friendly.

Signed-off-by: Josh Dolitsky <jdolitsky@gmail.com>

cmd/helm/chart_export.go

@@ -34,7 +34,9 @@ and check into source control if desired.
 `
 
 func newChartExportCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
-	return &cobra.Command{
+	client := action.NewChartExport(cfg)
+
+	cmd := &cobra.Command{
 		Use:    "export [ref]",
 		Short:  "export a chart to directory",
 		Long:   chartExportDesc,
@@ -42,7 +44,12 @@ func newChartExportCmd(cfg *action.Configuration, out io.Writer) *cobra.Command
 		Hidden: !FeatureGateOCI.IsEnabled(),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			ref := args[0]
-			return action.NewChartExport(cfg).Run(out, ref)
+			return client.Run(out, ref)
 		},
 	}
+
+	f := cmd.Flags()
+	f.StringVarP(&client.Destination, "destination", "d", ".", "location to write the chart.")
+
+	return cmd
 }

cmd/helm/chart_save.go

@@ -50,7 +50,7 @@ func newChartSaveCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 				return err
 			}
 
-			ch, err := loader.LoadDir(path)
+			ch, err := loader.Load(path)
 			if err != nil {
 				return err
 			}

pkg/action/chart_export.go

@@ -19,6 +19,7 @@ package action
 import (
 	"fmt"
 	"io"
+	"path/filepath"
 
 	"helm.sh/helm/internal/experimental/registry"
 	"helm.sh/helm/pkg/chartutil"
@@ -27,6 +28,8 @@ import (
 // ChartExport performs a chart export operation.
 type ChartExport struct {
 	cfg *Configuration
+
+	Destination string
 }
 
 // NewChartExport creates a new ChartExport object with the given configuration.
@@ -48,13 +51,13 @@ func (a *ChartExport) Run(out io.Writer, ref string) error {
 		return err
 	}
 
-	// Save the chart to local directory
-	// TODO: make destination dir configurable
-	err = chartutil.SaveDir(ch, ".")
+	// Save the chart to local destination directory
+	err = chartutil.SaveDir(ch, a.Destination)
 	if err != nil {
 		return err
 	}
 
-	fmt.Fprintf(out, "Exported to %s/\n", ch.Metadata.Name)
+	d := filepath.Join(a.Destination, ch.Metadata.Name)
+	fmt.Fprintf(out, "Exported chart to %s/\n", d)
 	return nil
 }

pkg/gates/gates.go

@@ -34,5 +34,5 @@ func (g Gate) IsEnabled() bool {
 }
 
 func (g Gate) Error() error {
-	return fmt.Errorf("this feature has been marked as experimental and is not enabled by default. Please set $%s in your environment to use this feature", g.String())
+	return fmt.Errorf("this feature has been marked as experimental and is not enabled by default. Please set %s=1 in your environment to use this feature", g.String())
 }

pkg/gates/gates_test.go

@@ -27,13 +27,13 @@ func TestIsEnabled(t *testing.T) {
 	g := Gate(name)
 
 	if g.IsEnabled() {
-		t.Errorf("feature gate shows as available, but the environment variable $%s was not set", name)
+		t.Errorf("feature gate shows as available, but the environment variable %s was not set", name)
 	}
 
 	os.Setenv(name, "1")
 
 	if !g.IsEnabled() {
-		t.Errorf("feature gate shows as disabled, but the environment variable $%s was set", name)
+		t.Errorf("feature gate shows as disabled, but the environment variable %s was set", name)
 	}
 }
 
@@ -41,7 +41,7 @@ func TestError(t *testing.T) {
 	os.Unsetenv(name)
 	g := Gate(name)
 
-	if g.Error().Error() != "this feature has been marked as experimental and is not enabled by default. Please set $HELM_EXPERIMENTAL_FEATURE in your environment to use this feature" {
+	if g.Error().Error() != "this feature has been marked as experimental and is not enabled by default. Please set HELM_EXPERIMENTAL_FEATURE=1 in your environment to use this feature" {
 		t.Errorf("incorrect error message. Received %s", g.Error().Error())
 	}
 }