Not sure if it is intended but when running sandbox (--run) it deletes special files I created in the directory. This should probably fix it.
diff --git a/isolate.c b/isolate.c
index 8a685e7..e738fc1 100644
--- a/isolate.c
+++ b/isolate.c
@@ -1044,7 +1044,7 @@ run(char **argv)
close_all_fds();
}
- chowntree("box", box_uid, box_gid, false);
+ chowntree("box", box_uid, box_gid, special_files);
cleanup_ownership = 1;
setup_pipe(error_pipes, 1);