Merge pull request #5496 from travelaudience/get-version

feat(helm) add 'get --template' to retrieve details about chart (ie version)

cmd/helm/get.go

@@ -41,10 +41,11 @@ chart, the supplied values, and the generated manifest file.
 var errReleaseRequired = errors.New("release name is required")
 
 type getCmd struct {
-	release string
-	out     io.Writer
-	client  helm.Interface
-	version int32
+	release  string
+	out      io.Writer
+	client   helm.Interface
+	version  int32
+	template string
 }
 
 func newGetCmd(client helm.Interface, out io.Writer) *cobra.Command {
@@ -73,6 +74,7 @@ func newGetCmd(client helm.Interface, out io.Writer) *cobra.Command {
 	f := cmd.Flags()
 	settings.AddFlagsTLS(f)
 	f.Int32Var(&get.version, "revision", 0, "get the named release with revision")
+	f.StringVar(&get.template, "template", "", "go template for formatting the output, eg: {{.Release.Name}}")
 
 	cmd.AddCommand(newGetValuesCmd(nil, out))
 	cmd.AddCommand(newGetManifestCmd(nil, out))
@@ -91,5 +93,9 @@ func (g *getCmd) run() error {
 	if err != nil {
 		return prettyError(err)
 	}
+
+	if g.template != "" {
+		return tpl(g.template, res, g.out)
+	}
 	return printRelease(g.out, res.Release)
 }

cmd/helm/get_test.go

@@ -35,6 +35,13 @@ func TestGetCmd(t *testing.T) {
 			expected: "REVISION: 1\nRELEASED: (.*)\nCHART: foo-0.1.0-beta.1\nUSER-SUPPLIED VALUES:\nname: \"value\"\nCOMPUTED VALUES:\nname: value\n\nHOOKS:\n---\n# pre-install-hook\n" + helm.MockHookTemplate + "\nMANIFEST:",
 			rels:     []*release.Release{helm.ReleaseMock(&helm.MockReleaseOptions{Name: "thomas-guide"})},
 		},
+		{
+			name:     "get with a formatted release",
+			resp:     helm.ReleaseMock(&helm.MockReleaseOptions{Name: "elevated-turkey"}),
+			args:     []string{"elevated-turkey", "--template", "{{.Release.Chart.Metadata.Version}}"},
+			expected: "0.1.0-beta.1",
+			rels:     []*release.Release{helm.ReleaseMock(&helm.MockReleaseOptions{Name: "elevated-turkey"})},
+		},
 		{
 			name: "get requires release name arg",
 			err:  true,

cmd/helm/printer.go

@@ -66,7 +66,7 @@ func printRelease(out io.Writer, rel *release.Release) error {
 	return tpl(printReleaseTemplate, data, out)
 }
 
-func tpl(t string, vals map[string]interface{}, out io.Writer) error {
+func tpl(t string, vals interface{}, out io.Writer) error {
 	tt, err := template.New("_").Parse(t)
 	if err != nil {
 		return err

docs/helm/helm_get.md

@@ -26,6 +26,7 @@ helm get [flags] RELEASE_NAME
 ```
   -h, --help                  help for get
       --revision int32        get the named release with revision
+      --template string       go template for formatting the output, eg: {{.Release.Name}}
       --tls                   enable TLS for request
       --tls-ca-cert string    path to TLS CA certificate file (default "$HELM_HOME/ca.pem")
       --tls-cert string       path to TLS certificate file (default "$HELM_HOME/cert.pem")
@@ -54,4 +55,4 @@ helm get [flags] RELEASE_NAME
 * [helm get notes](helm_get_notes.md)	 - displays the notes of the named release
 * [helm get values](helm_get_values.md)	 - download the values file for a named release
 
-###### Auto generated by spf13/cobra on 1-Sep-2018
+###### Auto generated by spf13/cobra on 25-Mar-2019