fix(helm): add --app-version flag to 'helm package'

When 'helm package --app-version foo' is run, this will
set the AppVersion field to 'foo' in the packaged chart.

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

cmd/helm/package.go

@@ -56,6 +56,7 @@ type packageCmd struct {
 	key              string
 	keyring          string
 	version          string
+	appVersion       string
 	destination      string
 	dependencyUpdate bool
 
@@ -99,6 +100,7 @@ func newPackageCmd(out io.Writer) *cobra.Command {
 	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")
+	f.StringVar(&pkg.appVersion, "app-version", "", "set the appVersion on the chart to this version")
 	f.StringVarP(&pkg.destination, "destination", "d", ".", "location to write the chart.")
 	f.BoolVarP(&pkg.dependencyUpdate, "dependency-update", "u", false, `update dependencies from "requirements.yaml" to dir "charts/" before packaging`)
 
@@ -139,6 +141,11 @@ func (p *packageCmd) run() error {
 		debug("Setting version to %s", p.version)
 	}
 
+	if p.appVersion != "" {
+		ch.Metadata.AppVersion = p.appVersion
+		debug("Setting appVersion to %s", p.appVersion)
+	}
+
 	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)
 	}

cmd/helm/package_test.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/spf13/cobra"
 
+	"k8s.io/helm/pkg/chartutil"
 	"k8s.io/helm/pkg/helm/helmpath"
 	"k8s.io/helm/pkg/proto/hapi/chart"
 )
@@ -200,6 +201,38 @@ func TestPackage(t *testing.T) {
 	}
 }
 
+func TestSetAppVersion(t *testing.T) {
+	var ch *chart.Chart
+	expectedAppVersion := "app-version-foo"
+	tmp, _ := ioutil.TempDir("", "helm-package-app-version-")
+	defer os.RemoveAll(tmp)
+
+	c := newPackageCmd(&bytes.Buffer{})
+	flags := map[string]string{
+		"destination": tmp,
+		"app-version": expectedAppVersion,
+	}
+	setFlags(c, flags)
+	err := c.RunE(c, []string{"testdata/testcharts/alpine"})
+	if err != nil {
+		t.Errorf("unexpected error %q", err)
+	}
+
+	chartPath := filepath.Join(tmp, "alpine-0.1.0.tgz")
+	if fi, err := os.Stat(chartPath); err != nil {
+		t.Errorf("expected file %q, got err %q", chartPath, err)
+	} else if fi.Size() == 0 {
+		t.Errorf("file %q has zero bytes.", chartPath)
+	}
+	ch, err = chartutil.Load(chartPath)
+	if err != nil {
+		t.Errorf("unexpected error loading packaged chart: %v", err)
+	}
+	if ch.Metadata.AppVersion != expectedAppVersion {
+		t.Errorf("expected app-version %q, found %q", expectedAppVersion, ch.Metadata.AppVersion)
+	}
+}
+
 func setFlags(cmd *cobra.Command, flags map[string]string) {
 	dest := cmd.Flags()
 	for f, v := range flags {

docs/helm/helm_package.md

@@ -23,6 +23,7 @@ helm package [flags] [CHART_PATH] [...]
 ### Options
 
 ```
+      --app-version string   set the appVersion on the chart to this version
   -u, --dependency-update    update dependencies from "requirements.yaml" to dir "charts/" before packaging
   -d, --destination string   location to write the chart. (default ".")
       --key string           name of the key to use when signing. Used if --sign is true
@@ -46,4 +47,4 @@ helm package [flags] [CHART_PATH] [...]
 ### SEE ALSO
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 7-Nov-2017
+###### Auto generated by spf13/cobra on 24-Nov-2017