fix(cmd): Add --output option to get values

Signed-off-by: Dean Coakley <dean.s.coakley@gmail.com>

cmd/helm/get_values.go

@@ -17,20 +17,26 @@ limitations under the License.
 package main
 
 import (
-	"fmt"
 	"io"
 
+	"github.com/gosuri/uitable"
 	"github.com/spf13/cobra"
 
 	"helm.sh/helm/v3/cmd/helm/require"
 	"helm.sh/helm/v3/pkg/action"
+	"helm.sh/helm/v3/pkg/cli/output"
 )
 
 var getValuesHelp = `
 This command downloads a values file for a given release.
 `
 
+type valuesWriter struct {
+	vals map[string]interface{}
+}
+
 func newGetValuesCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
+	var outfmt output.Format
 	client := action.NewGetValues(cfg)
 
 	cmd := &cobra.Command{
@@ -39,17 +45,35 @@ func newGetValuesCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 		Long:  getValuesHelp,
 		Args:  require.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
-			res, err := client.Run(args[0])
+			vals, err := client.Run(args[0])
 			if err != nil {
 				return err
 			}
-			fmt.Fprintln(out, res)
-			return nil
+			return outfmt.Write(out, &valuesWriter{vals})
 		},
 	}
 
 	f := cmd.Flags()
 	f.IntVar(&client.Version, "revision", 0, "get the named release with revision")
 	f.BoolVarP(&client.AllValues, "all", "a", false, "dump all (computed) values")
+	bindOutputFlag(cmd, &outfmt)
+
 	return cmd
 }
+
+func (v valuesWriter) WriteTable(out io.Writer) error {
+	table := uitable.New()
+	table.AddRow("USER-SUPPLIED VALUES:")
+	for k, v := range v.vals {
+		table.AddRow(k, v)
+	}
+	return output.EncodeTable(out, table)
+}
+
+func (v valuesWriter) WriteJSON(out io.Writer) error {
+	return output.EncodeJSON(out, v)
+}
+
+func (v valuesWriter) WriteYAML(out io.Writer) error {
+	return output.EncodeYAML(out, v)
+}

cmd/helm/get_values_test.go

@@ -32,7 +32,13 @@ func TestGetValuesCmd(t *testing.T) {
 		name:      "get values requires release name arg",
 		cmd:       "get values",
 		golden:    "output/get-values-args.txt",
+		rels:      []*release.Release{release.Mock(&release.MockReleaseOptions{Name: "thomas-guide"})},
 		wantError: true,
+	}, {
+		name:   "get values to json",
+		cmd:    "get values thomas-guide --output json",
+		golden: "output/values.json",
+		rels:   []*release.Release{release.Mock(&release.MockReleaseOptions{Name: "thomas-guide"})},
 	}}
 	runTestCmd(t, tests)
 }

cmd/helm/testdata/output/values.json

@@ -0,0 +1 @@
+{"name": "value"}

pkg/action/get_values.go

@@ -17,8 +17,6 @@ limitations under the License.
 package action
 
 import (
-	"sigs.k8s.io/yaml"
-
 	"helm.sh/helm/v3/pkg/chartutil"
 )
 
@@ -40,29 +38,20 @@ func NewGetValues(cfg *Configuration) *GetValues {
 }
 
 // Run executes 'helm get values' against the given release.
-func (g *GetValues) Run(name string) (string, error) {
+func (g *GetValues) Run(name string) (map[string]interface{}, error) {
 	res, err := g.cfg.releaseContent(name, g.Version)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
 	// If the user wants all values, compute the values and return.
 	if g.AllValues {
 		cfg, err := chartutil.CoalesceValues(res.Chart, res.Config)
 		if err != nil {
-			return "", err
-		}
-		cfgStr, err := cfg.YAML()
-		if err != nil {
-			return "", err
+			return nil, err
 		}
-		return cfgStr, nil
-	}
-
-	resConfig, err := yaml.Marshal(res.Config)
-	if err != nil {
-		return "", err
+		return cfg, nil
 	}
 
-	return string(resConfig), nil
+	return res.Chart.Values, nil
 }