feat(helm): inspect readme

cmd/helm/inspect.go

@@ -19,11 +19,14 @@ package main
 import (
 	"fmt"
 	"io"
+	"strings"
 
 	"github.com/ghodss/yaml"
+	"github.com/golang/protobuf/ptypes/any"
 	"github.com/spf13/cobra"
 
 	"k8s.io/helm/pkg/chartutil"
+	"k8s.io/kubernetes/pkg/util/slice"
 )
 
 const inspectDesc = `
@@ -43,6 +46,11 @@ This command inspects a chart (directory, file, or URL) and displays the content
 of the Charts.yaml file
 `
 
+const readmeChartDesc = `
+This command inspects a chart (directory, file, or URL) and displays the contents
+of the README file
+`
+
 type inspectCmd struct {
 	chartpath string
 	output    string
@@ -60,13 +68,16 @@ type inspectCmd struct {
 const (
 	chartOnly  = "chart"
 	valuesOnly = "values"
-	both       = "both"
+	readmeOnly = "readme"
+	all        = "all"
 )
 
+var readmeFileNames = []string{"readme.md", "readme.txt", "readme"}
+
 func newInspectCmd(out io.Writer) *cobra.Command {
 	insp := &inspectCmd{
 		out:    out,
-		output: both,
+		output: all,
 	}
 
 	inspectCommand := &cobra.Command{
@@ -125,51 +136,72 @@ func newInspectCmd(out io.Writer) *cobra.Command {
 		},
 	}
 
+	readmeSubCmd := &cobra.Command{
+		Use:   "readme [CHART]",
+		Short: "shows inspect readme",
+		Long:  readmeChartDesc,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			insp.output = readmeOnly
+			if err := checkArgsLength(len(args), "chart name"); err != nil {
+				return err
+			}
+			cp, err := locateChartPath(insp.repoURL, args[0], insp.version, insp.verify, insp.keyring,
+				insp.certFile, insp.keyFile, insp.caFile)
+			if err != nil {
+				return err
+			}
+			insp.chartpath = cp
+			return insp.run()
+		},
+	}
+
+	cmds := []*cobra.Command{inspectCommand, readmeSubCmd, valuesSubCmd, chartSubCmd}
 	vflag := "verify"
 	vdesc := "verify the provenance data for this chart"
-	inspectCommand.Flags().BoolVar(&insp.verify, vflag, false, vdesc)
-	valuesSubCmd.Flags().BoolVar(&insp.verify, vflag, false, vdesc)
-	chartSubCmd.Flags().BoolVar(&insp.verify, vflag, false, vdesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().BoolVar(&insp.verify, vflag, false, vdesc)
+	}
 
 	kflag := "keyring"
 	kdesc := "path to the keyring containing public verification keys"
 	kdefault := defaultKeyring()
-	inspectCommand.Flags().StringVar(&insp.keyring, kflag, kdefault, kdesc)
-	valuesSubCmd.Flags().StringVar(&insp.keyring, kflag, kdefault, kdesc)
-	chartSubCmd.Flags().StringVar(&insp.keyring, kflag, kdefault, kdesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.keyring, kflag, kdefault, kdesc)
+	}
 
 	verflag := "version"
 	verdesc := "version of the chart. By default, the newest chart is shown"
-	inspectCommand.Flags().StringVar(&insp.version, verflag, "", verdesc)
-	valuesSubCmd.Flags().StringVar(&insp.version, verflag, "", verdesc)
-	chartSubCmd.Flags().StringVar(&insp.version, verflag, "", verdesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.version, verflag, "", verdesc)
+	}
 
 	repoURL := "repo"
 	repoURLdesc := "chart repository url where to locate the requested chart"
-	inspectCommand.Flags().StringVar(&insp.repoURL, repoURL, "", repoURLdesc)
-	valuesSubCmd.Flags().StringVar(&insp.repoURL, repoURL, "", repoURLdesc)
-	chartSubCmd.Flags().StringVar(&insp.repoURL, repoURL, "", repoURLdesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.repoURL, repoURL, "", repoURLdesc)
+	}
 
 	certFile := "cert-file"
 	certFiledesc := "verify certificates of HTTPS-enabled servers using this CA bundle"
-	inspectCommand.Flags().StringVar(&insp.certFile, certFile, "", certFiledesc)
-	valuesSubCmd.Flags().StringVar(&insp.certFile, certFile, "", certFiledesc)
-	chartSubCmd.Flags().StringVar(&insp.certFile, certFile, "", certFiledesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.certFile, certFile, "", certFiledesc)
+	}
 
 	keyFile := "key-file"
 	keyFiledesc := "identify HTTPS client using this SSL key file"
-	inspectCommand.Flags().StringVar(&insp.keyFile, keyFile, "", keyFiledesc)
-	valuesSubCmd.Flags().StringVar(&insp.keyFile, keyFile, "", keyFiledesc)
-	chartSubCmd.Flags().StringVar(&insp.keyFile, keyFile, "", keyFiledesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.keyFile, keyFile, "", keyFiledesc)
+	}
 
 	caFile := "ca-file"
 	caFiledesc := "chart repository url where to locate the requested chart"
-	inspectCommand.Flags().StringVar(&insp.caFile, caFile, "", caFiledesc)
-	valuesSubCmd.Flags().StringVar(&insp.caFile, caFile, "", caFiledesc)
-	chartSubCmd.Flags().StringVar(&insp.caFile, caFile, "", caFiledesc)
+	for _, subCmd := range cmds {
+		subCmd.Flags().StringVar(&insp.caFile, caFile, "", caFiledesc)
+	}
 
-	inspectCommand.AddCommand(valuesSubCmd)
-	inspectCommand.AddCommand(chartSubCmd)
+	for _, subCmd := range cmds[1:] {
+		inspectCommand.AddCommand(subCmd)
+	}
 
 	return inspectCommand
 }
@@ -184,16 +216,35 @@ func (i *inspectCmd) run() error {
 		return err
 	}
 
-	if i.output == chartOnly || i.output == both {
+	if i.output == chartOnly || i.output == all {
 		fmt.Fprintln(i.out, string(cf))
 	}
 
-	if (i.output == valuesOnly || i.output == both) && chrt.Values != nil {
-		if i.output == both {
+	if (i.output == valuesOnly || i.output == all) && chrt.Values != nil {
+		if i.output == all {
 			fmt.Fprintln(i.out, "---")
 		}
 		fmt.Fprintln(i.out, chrt.Values.Raw)
 	}
 
+	if i.output == readmeOnly || i.output == all {
+		if i.output == all {
+			fmt.Fprintln(i.out, "---")
+		}
+		readme := findReadme(chrt.Files)
+		if readme == nil {
+			return nil
+		}
+		fmt.Fprintln(i.out, string(readme.Value))
+	}
+	return nil
+}
+
+func findReadme(files []*any.Any) (file *any.Any) {
+	for _, file := range files {
+		if slice.ContainsString(readmeFileNames, strings.ToLower(file.TypeUrl), nil) {
+			return file
+		}
+	}
 	return nil
 }

cmd/helm/inspect_test.go

@@ -28,7 +28,7 @@ func TestInspect(t *testing.T) {
 
 	insp := &inspectCmd{
 		chartpath: "testdata/testcharts/alpine",
-		output:    "both",
+		output:    all,
 		out:       b,
 	}
 	insp.run()
@@ -42,15 +42,19 @@ func TestInspect(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-
-	parts := strings.SplitN(b.String(), "---", 2)
-	if len(parts) != 2 {
+	readmeData, err := ioutil.ReadFile("testdata/testcharts/alpine/README.md")
+	if err != nil {
+		t.Fatal(err)
+	}
+	parts := strings.SplitN(b.String(), "---", 3)
+	if len(parts) != 3 {
 		t.Fatalf("Expected 2 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),
 	}
 
 	// Problem: ghodss/yaml doesn't marshal into struct order. To solve, we
@@ -73,5 +77,4 @@ func TestInspect(t *testing.T) {
 	if b.Len() != 0 {
 		t.Errorf("expected empty values buffer, got %q", b.String())
 	}
-
 }

docs/helm/helm.md

@@ -68,4 +68,4 @@ Environment:
 * [helm verify](helm_verify.md)	 - verify that a chart at the given path has been signed and is valid
 * [helm version](helm_version.md)	 - print the client/server version information
 
-###### Auto generated by spf13/cobra on 8-Mar-2018
+###### Auto generated by spf13/cobra on 14-Mar-2018

docs/helm/helm_inspect.md

@@ -42,6 +42,7 @@ helm inspect [CHART]
 ### SEE ALSO
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 * [helm inspect chart](helm_inspect_chart.md)	 - shows inspect chart
+* [helm inspect readme](helm_inspect_readme.md)	 - shows inspect readme
 * [helm inspect values](helm_inspect_values.md)	 - shows inspect values
 
-###### Auto generated by spf13/cobra on 8-Mar-2018
+###### Auto generated by spf13/cobra on 14-Mar-2018

docs/helm/helm_inspect_readme.md

+## helm inspect readme
+
+shows inspect readme
+
+### Synopsis
+
+
+
+This command inspects a chart (directory, file, or URL) and displays the contents
+of the README file
+
+
+```
+helm inspect readme [CHART]
+```
+
+### Options
+
+```
+      --ca-file string     chart repository url where to locate the requested chart
+      --cert-file string   verify certificates of HTTPS-enabled servers using this CA bundle
+      --key-file string    identify HTTPS client using this SSL key file
+      --keyring string     path to the keyring containing public verification keys (default "~/.gnupg/pubring.gpg")
+      --repo string        chart repository url where to locate the requested chart
+      --verify             verify the provenance data for this chart
+      --version string     version of the chart. By default, the newest chart is shown
+```
+
+### Options inherited from parent commands
+
+```
+      --debug                           enable verbose output
+      --home string                     location of your Helm config. Overrides $HELM_HOME (default "~/.helm")
+      --host string                     address of Tiller. Overrides $HELM_HOST
+      --kube-context string             name of the kubeconfig context to use
+      --tiller-connection-timeout int   the duration (in seconds) Helm will wait to establish a connection to tiller (default 300)
+      --tiller-namespace string         namespace of Tiller (default "kube-system")
+```
+
+### SEE ALSO
+* [helm inspect](helm_inspect.md)	 - inspect a chart
+
+###### Auto generated by spf13/cobra on 14-Mar-2018