preinst is in zfsutils-linux 0.6.5.6-0ubuntu8.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
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 19 20 21 22 23 24 | #!/bin/sh
set -e
# Automatically added by dh_installudev
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/udev/rules.d/60_zfsutils-linux.zvol.rules" ]; then
		if [ "`md5sum \"/etc/udev/rules.d/60_zfsutils-linux.zvol.rules\" | sed -e \"s/ .*//\"`" = \
		     "`dpkg-query -W -f='${Conffiles}' zfsutils-linux | sed -n -e \"\\\\' /etc/udev/rules.d/60_zfsutils-linux.zvol.rules '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			rm -f "/etc/udev/rules.d/60_zfsutils-linux.zvol.rules"
		fi
	fi
fi
# End automatically added section
# Automatically added by dh_installudev
if [ "$1" = install ] || [ "$1" = upgrade ]; then
	if [ -e "/etc/udev/rules.d/69_zfsutils-linux.vdev.rules" ]; then
		if [ "`md5sum \"/etc/udev/rules.d/69_zfsutils-linux.vdev.rules\" | sed -e \"s/ .*//\"`" = \
		     "`dpkg-query -W -f='${Conffiles}' zfsutils-linux | sed -n -e \"\\\\' /etc/udev/rules.d/69_zfsutils-linux.vdev.rules '{s/ obsolete$//;s/.* //p}\"`" ]
		then
			rm -f "/etc/udev/rules.d/69_zfsutils-linux.vdev.rules"
		fi
	fi
fi
# End automatically added section
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