/usr/lib/dracut/modules.d/90dmsquash-live/dmsquash-live-genrules.sh is in dracut-core 047-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
case "$root" in
live:/dev/*)
{
printf 'KERNEL=="%s", RUN+="/sbin/initqueue --settled --onetime --unique /sbin/dmsquash-live-root %s"\n' \
"${root#live:/dev/}" "${root#live:}"
printf 'SYMLINK=="%s", RUN+="/sbin/initqueue --settled --onetime --unique /sbin/dmsquash-live-root %s"\n' \
"${root#live:/dev/}" "${root#live:}"
} >> /etc/udev/rules.d/99-live-squash.rules
wait_for_dev -n "${root#live:}"
;;
live:*)
if [ -f "${root#live:}" ]; then
/sbin/initqueue --settled --onetime --unique /sbin/dmsquash-live-root "${root#live:}"
fi
;;
esac
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