Index: Add Path() accessor

index.go

@@ -114,6 +114,12 @@ func OpenIndex(path string) (*Index, error) {
 	return &Index{ptr: ptr}, nil
 }
 
+// Path returns the index' path on disk or an empty string if it
+// exists only in memory.
+func (v *Index) Path() string {
+	return C.GoString(C.git_index_path(v.ptr))
+}
+
 // Add adds or replaces the given entry to the index, making a copy of
 // the data
 func (v *Index) Add(entry *IndexEntry) error {

index_test.go

@@ -83,6 +83,10 @@ func TestIndexAddAndWriteTreeTo(t *testing.T) {
 	idx, err := NewIndex()
 	checkFatal(t, err)
 
+	if idx.Path() != "" {
+		t.Fatal("in-memory repo has a path")
+	}
+
 	entry := IndexEntry{
 		Path: "README",
 		Id:   blobID,
@@ -163,6 +167,10 @@ func TestIndexOpen(t *testing.T) {
 	idx, err := OpenIndex(path)
 	checkFatal(t, err)
 
+	if path != idx.Path() {
+		t.Fatalf("mismatched index paths, expected %v, got %v", path, idx.Path())
+	}
+
 	err = idx.Write()
 	checkFatal(t, err)