fix(helm): refactor 'helm update' to match new style

And add tests.

Closes #696

cmd/helm/helm.go

@@ -97,6 +97,7 @@ func newRootCmd(out io.Writer) *cobra.Command {
 		newPackageCmd(nil, out),
 		newFetchCmd(out),
 		newVerifyCmd(out),
+		newUpdateCmd(out),
 	)
 	return cmd
 }

cmd/helm/testdata/repositories.yaml

@@ -0,0 +1,2 @@
+charts: http://storage.googleapis.com/kubernetes-charts
+local: http://localhost:8879/charts

cmd/helm/update.go

@@ -19,6 +19,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"sync"
 
 	"github.com/spf13/cobra"
@@ -26,23 +27,37 @@ import (
 	"k8s.io/helm/pkg/repo"
 )
 
-var verboseUpdate bool
+const updateDesc = `
+Update gets the latest information about charts from the respective chart repositories.
+Information is cached locally, where it is used by commands like 'helm search'.
+`
 
-var updateCommand = &cobra.Command{
-	Use:     "update",
-	Aliases: []string{"up"},
-	Short:   "update information on available charts in the chart repositories",
-	RunE:    runUpdate,
+type updateCmd struct {
+	repoFile string
+	update   func(map[string]string, bool, io.Writer)
+	out      io.Writer
 }
 
-func init() {
-	updateCommand.Flags().BoolVar(&verboseUpdate, "verbose", false, "verbose error messages")
-	RootCommand.AddCommand(updateCommand)
+func newUpdateCmd(out io.Writer) *cobra.Command {
+	u := &updateCmd{
+		out:      out,
+		update:   updateCharts,
+		repoFile: repositoriesFile(),
+	}
+	cmd := &cobra.Command{
+		Use:     "update",
+		Aliases: []string{"up"},
+		Short:   "update information on available charts in the chart repositories",
+		Long:    updateDesc,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return u.run()
+		},
+	}
+	return cmd
 }
 
-func runUpdate(cmd *cobra.Command, args []string) error {
-
-	f, err := repo.LoadRepositoriesFile(repositoriesFile())
+func (u *updateCmd) run() error {
+	f, err := repo.LoadRepositoriesFile(u.repoFile)
 	if err != nil {
 		return err
 	}
@@ -51,12 +66,12 @@ func runUpdate(cmd *cobra.Command, args []string) error {
 		return errors.New("no repositories found. You must add one before updating")
 	}
 
-	updateCharts(f.Repositories, verboseUpdate)
+	u.update(f.Repositories, flagDebug, u.out)
 	return nil
 }
 
-func updateCharts(repos map[string]string, verbose bool) {
-	fmt.Println("Hang tight while we grab the latest from your chart repositories...")
+func updateCharts(repos map[string]string, verbose bool, out io.Writer) {
+	fmt.Fprintln(out, "Hang tight while we grab the latest from your chart repositories...")
 	var wg sync.WaitGroup
 	for name, url := range repos {
 		wg.Add(1)
@@ -65,16 +80,16 @@ func updateCharts(repos map[string]string, verbose bool) {
 			indexFileName := cacheDirectory(n + "-index.yaml")
 			err := repo.DownloadIndexFile(n, u, indexFileName)
 			if err != nil {
-				updateErr := "...Unable to get an update from the " + n + " chart repository"
+				updateErr := fmt.Sprintf("...Unable to get an update from the %q chart repository", n)
 				if verbose {
 					updateErr = updateErr + ": " + err.Error()
 				}
-				fmt.Println(updateErr)
+				fmt.Fprintln(out, updateErr)
 			} else {
-				fmt.Println("...Successfully got an update from the " + n + " chart repository")
+				fmt.Fprintf(out, "...Successfully got an update from the %q chart repository\n", n)
 			}
 		}(name, url)
 	}
 	wg.Wait()
-	fmt.Println("Update Complete. Happy Helming!")
+	fmt.Fprintln(out, "Update Complete. Happy Helming!")
 }

cmd/helm/update_test.go

@@ -0,0 +1,87 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestUpdateCmd(t *testing.T) {
+	out := bytes.NewBuffer(nil)
+	// Instead of using the HTTP updater, we provide our own for this test.
+	// The TestUpdateCharts test verifies the HTTP behavior independently.
+	updater := func(repos map[string]string, verbose bool, out io.Writer) {
+		for name := range repos {
+			fmt.Fprintln(out, name)
+		}
+	}
+	uc := &updateCmd{
+		out:      out,
+		update:   updater,
+		repoFile: "testdata/repositories.yaml",
+	}
+	uc.run()
+
+	if got := out.String(); !strings.Contains(got, "charts") || !strings.Contains(got, "local") {
+		t.Errorf("Expected 'charts' and 'local' (in any order) got %s", got)
+	}
+}
+
+const mockRepoIndex = `
+mychart-0.1.0:
+  name: mychart-0.1.0
+  url: localhost:8879/charts/mychart-0.1.0.tgz
+  chartfile:
+    name: ""
+    home: ""
+    sources: []
+    version: ""
+    description: ""
+    keywords: []
+    maintainers: []
+    engine: ""
+    icon: ""
+`
+
+func TestUpdateCharts(t *testing.T) {
+	// This tests the repo in isolation. It creates a mock HTTP server that simply
+	// returns a static YAML file in the anticipate format.
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(mockRepoIndex))
+	})
+	srv := httptest.NewServer(handler)
+	defer srv.Close()
+
+	buf := bytes.NewBuffer(nil)
+	repos := map[string]string{
+		"charts": srv.URL,
+	}
+	updateCharts(repos, false, buf)
+
+	got := buf.String()
+	if strings.Contains(got, "Unable to get an update") {
+		t.Errorf("Failed to get a repo: %q", got)
+	}
+	if !strings.Contains(got, "Update Complete.") {
+		t.Errorf("Update was not successful")
+	}
+}