tar dir add slash

src/archive/tar/writer.go

@@ -424,6 +424,9 @@ func (tw *Writer) AddFS(fsys fs.FS) error {
 			return err
 		}
 		h.Name = name
+		if d.IsDir() {
+			h.Name += "/"
+		}
 		if err := tw.WriteHeader(h); err != nil {
 			return err
 		}

src/archive/tar/writer_test.go

@@ -1382,7 +1382,11 @@ func TestWriterAddFS(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		if hdr.Name != name {
+		tmpName := name
+		if entryInfo.IsDir() {
+			tmpName += "/"
+		}
+		if hdr.Name != tmpName {
 			t.Errorf("test fs has filename %v; archive header has %v",
 				name, hdr.Name)
 		}

src/archive/zip/writer.go

@@ -520,13 +520,15 @@ func (w *Writer) AddFS(fsys fs.FS) error {
 			return err
 		}
 		h.Name = name
+		if d.IsDir() {
+			h.Name += "/"
+		}
 		h.Method = Deflate
 		fw, err := w.CreateHeader(h)
 		if err != nil {
 			return err
 		}
 		if d.IsDir() {
-			h.Name += "/"
 			return nil
 		}
 		f, err := fsys.Open(name)