fix(helm): fix broken cache paths in repositories

A regression was committed during 2.2.0 that broke the repositories.yaml
file format, switching the cache path from relative to absolute. This
fixes the error.

Closes #1974

cmd/helm/home.go

@@ -21,6 +21,7 @@ import (
 	"io"
 
 	"github.com/spf13/cobra"
+	"k8s.io/helm/cmd/helm/helmpath"
 )
 
 var longHomeHelp = `
@@ -34,7 +35,17 @@ func newHomeCmd(out io.Writer) *cobra.Command {
 		Short: "displays the location of HELM_HOME",
 		Long:  longHomeHelp,
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Fprintf(out, homePath()+"\n")
+			h := helmpath.Home(homePath())
+			fmt.Fprintf(out, "%s\n", h)
+			if flagDebug {
+				fmt.Fprintf(out, "Repository: %s\n", h.Repository())
+				fmt.Fprintf(out, "RepositoryFile: %s\n", h.RepositoryFile())
+				fmt.Fprintf(out, "Cache: %s\n", h.Cache())
+				fmt.Fprintf(out, "Stable CacheIndex: %s\n", h.CacheIndex("stable"))
+				fmt.Fprintf(out, "Starters: %s\n", h.Starters())
+				fmt.Fprintf(out, "LocalRepository: %s\n", h.LocalRepository())
+				fmt.Fprintf(out, "Plugins: %s\n", h.Plugins())
+			}
 		},
 	}
 

cmd/helm/init.go

@@ -228,7 +228,9 @@ func initStableRepo(cacheFile string) (*repo.Entry, error) {
 		return nil, err
 	}
 
-	if err := r.DownloadIndexFile(); err != nil {
+	// In this case, the cacheFile is always absolute. So passing empty string
+	// is safe.
+	if err := r.DownloadIndexFile(""); err != nil {
 		return nil, fmt.Errorf("Looks like %q is not a valid chart repository or cannot be reached: %s", stableRepositoryURL, err.Error())
 	}
 

cmd/helm/repo_add.go

@@ -102,7 +102,7 @@ func addRepository(name, url string, home helmpath.Home, certFile, keyFile, caFi
 		return err
 	}
 
-	if err := r.DownloadIndexFile(); err != nil {
+	if err := r.DownloadIndexFile(home.Cache()); err != nil {
 		return fmt.Errorf("Looks like %q is not a valid chart repository or cannot be reached: %s", url, err.Error())
 	}
 

cmd/helm/repo_update.go

@@ -41,7 +41,7 @@ var (
 )
 
 type repoUpdateCmd struct {
-	update func([]*repo.ChartRepository, io.Writer)
+	update func([]*repo.ChartRepository, io.Writer, helmpath.Home)
 	home   helmpath.Home
 	out    io.Writer
 }
@@ -82,11 +82,11 @@ func (u *repoUpdateCmd) run() error {
 		repos = append(repos, r)
 	}
 
-	u.update(repos, u.out)
+	u.update(repos, u.out, u.home)
 	return nil
 }
 
-func updateCharts(repos []*repo.ChartRepository, out io.Writer) {
+func updateCharts(repos []*repo.ChartRepository, out io.Writer, home helmpath.Home) {
 	fmt.Fprintln(out, "Hang tight while we grab the latest from your chart repositories...")
 	var wg sync.WaitGroup
 	for _, re := range repos {
@@ -94,10 +94,10 @@ func updateCharts(repos []*repo.ChartRepository, out io.Writer) {
 		go func(re *repo.ChartRepository) {
 			defer wg.Done()
 			if re.Config.Name == localRepository {
-				fmt.Fprintf(out, "...Skip %s chart repository", re.Config.Name)
+				fmt.Fprintf(out, "...Skip %s chart repository\n", re.Config.Name)
 				return
 			}
-			err := re.DownloadIndexFile()
+			err := re.DownloadIndexFile(home.Cache())
 			if err != nil {
 				fmt.Fprintf(out, "...Unable to get an update from the %q chart repository (%s):\n\t%s\n", re.Config.Name, re.Config.URL, err)
 			} else {

cmd/helm/repo_update_test.go

@@ -43,7 +43,7 @@ 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 []*repo.ChartRepository, out io.Writer) {
+	updater := func(repos []*repo.ChartRepository, out io.Writer, hh helmpath.Home) {
 		for _, re := range repos {
 			fmt.Fprintln(out, re.Config.Name)
 		}
@@ -90,7 +90,7 @@ func TestUpdateCharts(t *testing.T) {
 	}
 
 	b := bytes.NewBuffer(nil)
-	updateCharts([]*repo.ChartRepository{r}, b)
+	updateCharts([]*repo.ChartRepository{r}, b, hh)
 
 	got := b.String()
 	if strings.Contains(got, "Unable to get an update") {

pkg/downloader/manager.go

@@ -30,7 +30,10 @@ import (
 	"github.com/Masterminds/semver"
 	"github.com/ghodss/yaml"
 
+	// FIXME: This violates the package rules. A `cmd` should not be imported by
+	// something in 'pkg'
 	"k8s.io/helm/cmd/helm/helmpath"
+
 	"k8s.io/helm/pkg/chartutil"
 	"k8s.io/helm/pkg/proto/hapi/chart"
 	"k8s.io/helm/pkg/repo"
@@ -375,7 +378,7 @@ func (m *Manager) parallelRepoUpdate(repos []*repo.Entry) error {
 		}
 		wg.Add(1)
 		go func(r *repo.ChartRepository) {
-			if err := r.DownloadIndexFile(); err != nil {
+			if err := r.DownloadIndexFile(m.HelmHome.Cache()); err != nil {
 				fmt.Fprintf(out, "...Unable to get an update from the %q chart repository (%s):\n\t%s\n", r.Config.Name, r.Config.URL, err)
 			} else {
 				fmt.Fprintf(out, "...Successfully got an update from the %q chart repository\n", r.Config.Name)

pkg/repo/chartrepo.go

@@ -129,7 +129,10 @@ func (r *ChartRepository) Load() error {
 }
 
 // DownloadIndexFile fetches the index from a repository.
-func (r *ChartRepository) DownloadIndexFile() error {
+//
+// cachePath is prepended to any index that does not have an absolute path. This
+// is for pre-2.2.0 repo files.
+func (r *ChartRepository) DownloadIndexFile(cachePath string) error {
 	var indexURL string
 
 	indexURL = strings.TrimSuffix(r.Config.URL, "/") + "/index.yaml"
@@ -148,7 +151,19 @@ func (r *ChartRepository) DownloadIndexFile() error {
 		return err
 	}
 
-	return ioutil.WriteFile(r.Config.Cache, index, 0644)
+	// In Helm 2.2.0 the config.cache was accidentally switched to an absolute
+	// path, which broke backward compatibility. This fixes it by prepending a
+	// global cache path to relative paths.
+	//
+	// It is changed on DownloadIndexFile because that was the method that
+	// originally carried the cache path.
+	cp := r.Config.Cache
+	if !filepath.IsAbs(cp) {
+		cp = filepath.Join(cachePath, cp)
+	}
+	println("Writing to", cp)
+
+	return ioutil.WriteFile(cp, index, 0644)
 }
 
 // Index generates an index for the chart repository and writes an index.yaml file.

pkg/repo/index_test.go

@@ -142,7 +142,7 @@ func TestDownloadIndexFile(t *testing.T) {
 		t.Errorf("Problem creating chart repository from %s: %v", testRepo, err)
 	}
 
-	if err := r.DownloadIndexFile(); err != nil {
+	if err := r.DownloadIndexFile(""); err != nil {
 		t.Errorf("%#v", err)
 	}