/lib/udev/rules.d/80-libinput-device-groups.rules is in libinput-bin 1.10.4-1.
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 8 9 | ACTION!="add|change", GOTO="libinput_device_group_end"
KERNEL!="event[0-9]*", GOTO="libinput_device_group_end"
ATTRS{phys}=="?*", \
ENV{LIBINPUT_DEVICE_GROUP}=="", \
PROGRAM="libinput-device-group %S%p", \
ENV{LIBINPUT_DEVICE_GROUP}="%c"
LABEL="libinput_device_group_end"
|