Comment 11 for bug 2049695

I notice you fallback to calling "umount -l" if "umount -R" failed when tearing down (see https://github.com/mwhudson/livefs-editor/blob/main/livefs_edit/context.py#L278)

This option was very tempting from the beginning but I fear, in the image building context, it will hide some hard to debug issues in the future.