Merge pull request #620 from technosophos/feat/helm-get-values

feat(helm): add 'get values', 'get manifest'

cmd/helm/get.go

@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"os"
 
 	"github.com/kubernetes/helm/pkg/helm"
 	"github.com/spf13/cobra"
@@ -21,6 +22,25 @@ By default, this prints a human readable collection of information about the
 chart, the supplied values, and the generated manifest file.
 `
 
+var getValuesHelp = `
+This command downloads a values file for a given release.
+
+To save the output to a file, use the -f flag.
+`
+
+var getManifestHelp = `
+This command fetches the generated manifest for a given release.
+
+A manifest is a YAML-encoded representation of the Kubernetes resources that
+were generated from this release's chart(s). If a chart is dependent on other
+charts, those resources will also be included in the manifest.
+`
+
+// getOut is the filename to direct output.
+//
+// If it is blank, output is sent to os.Stdout.
+var getOut = ""
+
 var errReleaseRequired = errors.New("release name is required")
 
 var getCommand = &cobra.Command{
@@ -30,10 +50,28 @@ var getCommand = &cobra.Command{
 	RunE:  getCmd,
 }
 
+var getValuesCommand = &cobra.Command{
+	Use:   "values [flags] RELEASE_NAME",
+	Short: "Download the values file for a named release",
+	Long:  getValuesHelp,
+	RunE:  getValues,
+}
+
+var getManifestCommand = &cobra.Command{
+	Use:   "manifest [flags] RELEASE_NAME",
+	Short: "Download the manifest for a named release",
+	Long:  getManifestHelp,
+	RunE:  getManifest,
+}
+
 func init() {
+	getCommand.PersistentFlags().StringVarP(&getOut, "file", "f", "", "output file")
+	getCommand.AddCommand(getValuesCommand)
+	getCommand.AddCommand(getManifestCommand)
 	RootCommand.AddCommand(getCommand)
 }
 
+// getCmd is the command that implements 'helm get'
 func getCmd(cmd *cobra.Command, args []string) error {
 	if len(args) == 0 {
 		return errReleaseRequired
@@ -51,3 +89,43 @@ func getCmd(cmd *cobra.Command, args []string) error {
 	fmt.Println(res.Release.Manifest)
 	return nil
 }
+
+// getValues implements 'helm get values'
+func getValues(cmd *cobra.Command, args []string) error {
+	if len(args) == 0 {
+		return errReleaseRequired
+	}
+
+	res, err := helm.GetReleaseContent(args[0])
+	if err != nil {
+		return err
+	}
+	return getToFile(res.Release.Config)
+}
+
+// getManifest implements 'helm get manifest'
+func getManifest(cmd *cobra.Command, args []string) error {
+	if len(args) == 0 {
+		return errReleaseRequired
+	}
+
+	res, err := helm.GetReleaseContent(args[0])
+	if err != nil {
+		return err
+	}
+	return getToFile(res.Release.Manifest)
+}
+
+func getToFile(v interface{}) error {
+	out := os.Stdout
+	if len(getOut) > 0 {
+		t, err := os.Create(getOut)
+		if err != nil {
+			return fmt.Errorf("failed to create %s: %s", getOut, err)
+		}
+		defer t.Close()
+		out = t
+	}
+	fmt.Fprintln(out, v)
+	return nil
+}