feat(helm): add templates subcmd to 'helm inspect'

When 'helm inspect templates' is run, this will print all templates file
in the output

Signed-off-by: qiminghu.hqm <qiminghu.hqm@ant-financial.com>

cmd/helm/inspect.go

@@ -45,6 +45,10 @@ of the Charts.yaml file
 	readmeChartDesc = `
 This command inspects a chart (directory, file, or URL) and displays the contents
 of the README file
+`
+	inspectTemplatesDesc = `
+This command inspects a chart (directory, file, or URL) and displays the contents
+of all templates file
 `
 )
 
@@ -66,10 +70,11 @@ type inspectCmd struct {
 }
 
 const (
-	chartOnly  = "chart"
+	chartOnly     = "chart"
-	valuesOnly = "values"
+	valuesOnly    = "values"
-	readmeOnly = "readme"
+	readmeOnly    = "readme"
-	all        = "all"
+	templatesOnly = "templates"
+	all           = "all"
 )
 
 var readmeFileNames = []string{"readme.md", "readme.txt", "readme"}
@@ -143,7 +148,23 @@ func newInspectCmd(out io.Writer) *cobra.Command {
 		},
 	}
 
-	cmds := []*cobra.Command{inspectCommand, readmeSubCmd, valuesSubCmd, chartSubCmd}
+	templatesSubCmd := &cobra.Command{
+		Use:   "templates [CHART]",
+		Short: "shows inspect templates",
+		Long:  inspectTemplatesDesc,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			insp.output = templatesOnly
+			if err := checkArgsLength(len(args), "chart name"); err != nil {
+				return err
+			}
+			if err := insp.prepare(args[0]); err != nil {
+				return err
+			}
+			return insp.run()
+		},
+	}
+
+	cmds := []*cobra.Command{inspectCommand, readmeSubCmd, valuesSubCmd, chartSubCmd, templatesSubCmd}
 	vflag := "verify"
 	vdesc := "Verify the provenance data for this chart"
 	for _, subCmd := range cmds {
@@ -259,6 +280,19 @@ func (i *inspectCmd) run() error {
 		}
 		fmt.Fprintln(i.out, string(readme.Value))
 	}
+	
+	if (i.output == templatesOnly || i.output == all) && chrt.Templates != nil {
+		for index, template := range chrt.Templates {
+			if index != 0 || i.output == all {
+				fmt.Fprintln(i.out, "---")
+			}
+
+			fmt.Fprintln(i.out, template.Name)
+			fmt.Fprintln(i.out, string(template.Data))
+		}
+	}
+	
+
 	return nil
 }
 
@@ -284,3 +318,4 @@ func containsString(slice []string, s string, modifier func(s string) string) bo
 	}
 	return false
 }
+

cmd/helm/inspect_test.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	"bytes"
+    "fmt"
 	"io/ioutil"
 	"os"
 	"strings"
@@ -49,15 +50,22 @@ func TestInspect(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	parts := strings.SplitN(b.String(), "---", 3)
+	templatesData, err := ioutil.ReadFile("testdata/testcharts/alpine/templates/alpine-pod.yaml")
-	if len(parts) != 3 {
+	if err != nil {
-		t.Fatalf("Expected 2 parts, got %d", len(parts))
+		t.Fatal(err)
+	}
+	templatesOutput := fmt.Sprintf("templates/alpine-pod.yaml\n%s", string(templatesData))
+
+	parts := strings.SplitN(b.String(), "---", 4)
+	if len(parts) != 4 {
+		t.Fatalf("Expected 4 parts, got %d", len(parts))
 	}
 
 	expect := []string{
 		strings.Replace(strings.TrimSpace(string(cdata)), "\r", "", -1),
 		strings.Replace(strings.TrimSpace(string(data)), "\r", "", -1),
 		strings.Replace(strings.TrimSpace(string(readmeData)), "\r", "", -1),
+		strings.Replace(strings.TrimSpace(templatesOutput), "\r", "", -1),
 	}
 
 	// Problem: ghodss/yaml doesn't marshal into struct order. To solve, we
@@ -144,3 +152,4 @@ func TestInspectPreReleaseChart(t *testing.T) {
 		})
 	}
 }
+