feat(1480): add --version flag to package command

This adds a `helm package --version=SEMVER` param that allows users to
set a version during a package operation.

Closes #1480
Closes #1699

cmd/helm/package.go

@@ -25,11 +25,13 @@ import (
 	"path/filepath"
 	"syscall"
 
+	"github.com/Masterminds/semver"
 	"github.com/spf13/cobra"
 	"golang.org/x/crypto/ssh/terminal"
 
 	"k8s.io/helm/cmd/helm/helmpath"
 	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/helm/pkg/proto/hapi/chart"
 	"k8s.io/helm/pkg/provenance"
 	"k8s.io/helm/pkg/repo"
 )
@@ -51,6 +53,7 @@ type packageCmd struct {
 	path    string
 	key     string
 	keyring string
+	version string
 	out     io.Writer
 	home    helmpath.Home
 }
@@ -92,6 +95,7 @@ func newPackageCmd(out io.Writer) *cobra.Command {
 	f.BoolVar(&pkg.sign, "sign", false, "use a PGP private key to sign this package")
 	f.StringVar(&pkg.key, "key", "", "name of the key to use when signing. Used if --sign is true")
 	f.StringVar(&pkg.keyring, "keyring", defaultKeyring(), "location of a public keyring")
+	f.StringVar(&pkg.version, "version", "", "set the version on the chart to this semver version")
 
 	return cmd
 }
@@ -107,6 +111,16 @@ func (p *packageCmd) run(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
+	// If version is set, modify the version.
+	if len(p.version) != 0 {
+		if err := setVersion(ch, p.version); err != nil {
+			return err
+		}
+		if flagDebug {
+			fmt.Fprintf(p.out, "Setting version to %s", p.version)
+		}
+	}
+
 	if filepath.Base(path) != ch.Metadata.Name {
 		return fmt.Errorf("directory name (%s) and Chart.yaml name (%s) must match", filepath.Base(path), ch.Metadata.Name)
 	}
@@ -139,6 +153,17 @@ func (p *packageCmd) run(cmd *cobra.Command, args []string) error {
 	return err
 }
 
+func setVersion(ch *chart.Chart, ver string) error {
+	// Verify that version is a SemVer, and error out if it is not.
+	if _, err := semver.NewVersion(ver); err != nil {
+		return err
+	}
+
+	// Set the version field on the chart.
+	ch.Metadata.Version = ver
+	return nil
+}
+
 func (p *packageCmd) clearsign(filename string) error {
 	// Load keyring
 	signer, err := provenance.NewFromKeyring(p.keyring, p.key)

cmd/helm/package_test.go

@@ -26,8 +26,30 @@ import (
 	"github.com/spf13/cobra"
 
 	"k8s.io/helm/cmd/helm/helmpath"
+	"k8s.io/helm/pkg/proto/hapi/chart"
 )
 
+func TestSetVersion(t *testing.T) {
+	c := &chart.Chart{
+		Metadata: &chart.Metadata{
+			Name:    "prow",
+			Version: "0.0.1",
+		},
+	}
+	expect := "1.2.3-beta.5"
+	if err := setVersion(c, expect); err != nil {
+		t.Fatal(err)
+	}
+
+	if c.Metadata.Version != expect {
+		t.Errorf("Expected %q, got %q", expect, c.Metadata.Version)
+	}
+
+	if err := setVersion(c, "monkeyface"); err == nil {
+		t.Error("Expected bogus version to return an error.")
+	}
+}
+
 func TestPackage(t *testing.T) {
 
 	tests := []struct {