added a RelativeIndex() func to helmhome to return a relative path to the index files. Also updated repo_add.go to use this new fun

cmd/helm/repo_add.go

@@ -86,7 +86,7 @@ func addRepository(name, url string, home helmpath.Home, certFile, keyFile, caFi
 		return fmt.Errorf("repository name (%s) already exists, please specify a different name", name)
 	}
 
-	cif := home.CacheIndex(name)
+	cif := home.RelativeIndex(name)
 	c := repo.Entry{
 		Name:     name,
 		Cache:    cif,

pkg/helm/helmpath/helmhome.go

@@ -61,6 +61,12 @@ func (h Home) CacheIndex(name string) string {
 	return h.Path("repository", "cache", target)
 }
 
+// RelativeIndex returns the relative path to an index for the given named repository.
+func (h Home) RelativeIndex(name string) string {
+	target := fmt.Sprintf("%s-index.yaml", name)
+	return filepath.Join(target)
+}
+
 // Starters returns the path to the Helm starter packs.
 func (h Home) Starters() string {
 	return h.Path("starters")