+static VALUE ruby_guestfs_add_drive_ro (VALUE gv, VALUE filenamev)
+{
+ guestfs_h *g;
+ Data_Get_Struct (gv, guestfs_h, g);
+ if (!g)
+ rb_raise (rb_eArgError, "%s: used handle after closing it", "add_drive_ro");
+
+ const char *filename = StringValueCStr (filenamev);
+ if (!filename)
+ rb_raise (rb_eTypeError, "expected string for parameter %s of %s",
+ "filename", "add_drive_ro");
+
+ int r;
+
+ r = guestfs_add_drive_ro (g, filename);
+ if (r == -1)
+ rb_raise (e_Error, "%s", guestfs_last_error (g));
+
+ return Qnil;
+}
+