- find a way to tell udev to not cancel firmware
   requests in initramfs

 - move /lib/udev/devices/ to tmpfiles

 - trigger --subsystem-match=usb/usb_device

 - kill rules_generator

 - have a $attrs{} ?

 - remove RUN+="socket:"

 - libudev.so.1
     - symbol versioning
     - return object with *_unref()
     - udev_monitor_from_socket()
     - udev_queue_get_failed_list_entry()