fix(cmd/helm): user friendly error message when repos are not configured

Signed-off-by: Adam Reese <adam@reese.io>

cmd/helm/repo.go

@@ -18,7 +18,9 @@ package main
 
 import (
 	"io"
+	"os"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"helm.sh/helm/cmd/helm/require"
@@ -48,3 +50,7 @@ func newRepoCmd(out io.Writer) *cobra.Command {
 
 	return cmd
 }
+
+func isNotExist(err error) bool {
+	return os.IsNotExist(errors.Cause(err))
+}

cmd/helm/repo_list.go

@@ -35,10 +35,7 @@ func newRepoListCmd(out io.Writer) *cobra.Command {
 		Args:  require.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			f, err := repo.LoadFile(settings.RepositoryConfig)
-			if err != nil {
-				return err
-			}
-			if len(f.Repositories) == 0 {
+			if isNotExist(err) || len(f.Repositories) == 0 {
 				return errors.New("no repositories to show")
 			}
 			table := uitable.New()

cmd/helm/repo_remove.go

@@ -56,8 +56,8 @@ func newRepoRemoveCmd(out io.Writer) *cobra.Command {
 
 func (o *repoRemoveOptions) run(out io.Writer) error {
 	r, err := repo.LoadFile(o.repoFile)
-	if err != nil {
-		return err
+	if isNotExist(err) || len(r.Repositories) == 0 {
+		return errors.New("no repositories configured")
 	}
 
 	if !r.Remove(o.name) {

cmd/helm/repo_update.go

@@ -59,13 +59,9 @@ func newRepoUpdateCmd(out io.Writer) *cobra.Command {
 }
 
 func (o *repoUpdateOptions) run(out io.Writer) error {
-	f, err := repo.LoadFile(o.repoFile)
-	if err != nil {
-		return err
-	}
-
-	if len(f.Repositories) == 0 {
-		return errNoRepositories
+	f, err := repo.LoadFile(settings.RepositoryConfig)
+	if isNotExist(err) || len(f.Repositories) == 0 {
+		return errors.New("no repositories to update")
 	}
 	var repos []*repo.ChartRepository
 	for _, cfg := range f.Repositories {

cmd/helm/search_repo.go

@@ -147,8 +147,8 @@ func (o *searchRepoOptions) formatSearchResults(res []*search.Result) string {
 func (o *searchRepoOptions) buildIndex(out io.Writer) (*search.Index, error) {
 	// Load the repositories.yaml
 	rf, err := repo.LoadFile(o.repoFile)
-	if err != nil {
-		return nil, errors.Wrap(err, "loading repository config")
+	if isNotExist(err) || len(rf.Repositories) == 0 {
+		return nil, errors.New("no repositories configured")
 	}
 
 	i := search.NewIndex()