/lib/udev/rules.d/usbmount.rules is in usbmount 0.0.22.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Rules for USBmount -*- conf -*-
KERNEL=="sd*", DRIVERS=="sbp2", ACTION=="add", RUN+="/usr/share/usbmount/usbmount add"
KERNEL=="sd*", SUBSYSTEMS=="usb", ACTION=="add", RUN+="/usr/share/usbmount/usbmount add"
KERNEL=="ub*", SUBSYSTEMS=="usb", ACTION=="add", RUN+="/usr/share/usbmount/usbmount add"
KERNEL=="sd*", ACTION=="remove", RUN+="/usr/share/usbmount/usbmount remove"
KERNEL=="ub*", ACTION=="remove", RUN+="/usr/share/usbmount/usbmount remove"
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