utils: merkletrie, Align error message with upstream

Signed-off-by: Paulo Gomes <pjbgf@linux.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/utils/merkletrie/change.go b/utils/merkletrie/change.go
index cc6dc89..450feb4 100644
--- a/utils/merkletrie/change.go
+++ b/utils/merkletrie/change.go
@@ -1,12 +1,17 @@
 package merkletrie
 
 import (
+	"errors"
 	"fmt"
 	"io"
 
 	"github.com/go-git/go-git/v5/utils/merkletrie/noder"
 )
 
+var (
+	ErrEmptyFileName = errors.New("empty filename in tree entry")
+)
+
 // Action values represent the kind of things a Change can represent:
 // insertion, deletions or modifications of files.
 type Action int
@@ -121,6 +126,10 @@ func (l *Changes) AddRecursiveDelete(root noder.Path) error {
 type noderToChangeFn func(noder.Path) Change // NewInsert or NewDelete
 
 func (l *Changes) addRecursive(root noder.Path, ctor noderToChangeFn) error {
+	if root.String() == "" {
+		return ErrEmptyFileName
+	}
+
 	if !root.IsDir() {
 		l.Add(ctor(root))
 		return nil