Add some smart for hardlink to symlink

sandbox/sandbox.go

@@ -200,14 +200,26 @@ func Make(ctx context.Context, cfg MakeConfig) error {
 		}
 		untarDedup.Add(to)
 
-		err := xfs.CreateParentDir(to)
+		err = xfs.CreateParentDir(to)
 		if err != nil {
 			return err
 		}
 
-		err = os.Link(file.From, to)
-		if err != nil {
-			return fmt.Errorf("make: link %v to %v: %w", file.From, to, err)
+		target, err := os.Readlink(file.From)
+		if err == nil {
+			if !filepath.IsAbs(target) {
+				target = filepath.Join(filepath.Dir(file.From), target)
+			}
+
+			err = os.Symlink(target, to)
+			if err != nil {
+				return err
+			}
+		} else {
+			err = os.Link(file.From, to)
+			if err != nil {
+				return fmt.Errorf("make: link %v to %v: %w", file.From, to, err)
+			}
 		}
 
 		if cfg.ProgressLinks != nil {

utils/xstarlark/fmt/fmt.go

@@ -300,6 +300,12 @@ func (f *formatter) formatStmt(w Writer, sstmt syntax.Stmt) error {
 			return err
 		}
 	case *syntax.ReturnStmt:
+		if stmt.Result == nil {
+			w.WriteString("return")
+
+			return nil
+		}
+
 		w.WriteString("return ")
 		return f.formatExpr(w, stmt.Result)
 	case *IfStmt: