Merge pull request #21 from technosophos/feat/helm-package

feat(helm): add 'helm package' command

cmd/helm/package.go

+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/deis/tiller/pkg/chart"
+	"github.com/spf13/cobra"
+)
+
+const packageDesc = `
+This command packages a chart into a versioned chart archive file. If a path
+is given, this will look at that path for a chart (which must contain a
+Chart.yaml file) and then package that directory.
+
+If no path is given, this will look in the present working directory for a
+Chart.yaml file, and (if found) build the current directory into a chart.
+
+Versioned chart archives are used by Helm package repositories.
+`
+
+func init() {
+	RootCommand.AddCommand(packageCmd)
+}
+
+var packageCmd = &cobra.Command{
+	Use:   "package",
+	Short: "Package a chart directory into a chart archive.",
+	Long:  packageDesc,
+	RunE:  runPackage,
+}
+
+func runPackage(cmd *cobra.Command, args []string) error {
+	path := "."
+	if len(args) > 0 {
+		path = args[0]
+	}
+
+	path, err := filepath.Abs(path)
+	if err != nil {
+		return err
+	}
+
+	ch, err := chart.LoadDir(path)
+	if err != nil {
+		return err
+	}
+
+	// Save to the current working directory.
+	cwd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	name, err := chart.Save(ch, cwd)
+	if err == nil {
+		cmd.Printf("Saved %s", name)
+	}
+	return err
+}