preinst is in ufw 0.35-0ubuntu2.
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 | #!/bin/sh -e
if [ "$1" = "upgrade" ] && [ -f /etc/ufw/ufw.conf ]; then
if dpkg --compare-versions "$2" lt 0.29.1-1 ; then
level=`grep '^LOGLEVEL=.*' /etc/ufw/ufw.conf | cut -f 2 -d '=' | tr A-Z a-z`
if [ -z "$level" ]; then
# Convert old-style logging mechanism to the new. This is
# primarly useful for Ubuntu 8.04 LTS to Ubuntu 10.04 LTS
# upgrades, but also will cover some other odd situations.
if grep -q '^\-A ufw-after-input -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "\[UFW BLOCK INPUT\]: "$' /etc/ufw/after.rules ; then
level="low"
else
level="off"
fi
echo "# AUTOMATICALLY ADDED ON UPGRADE:" >> /etc/ufw/ufw.conf
echo "# set to one of 'off', 'low', 'medium', 'high'" >> /etc/ufw/ufw.conf
echo "LOGLEVEL=$level" >> /etc/ufw/ufw.conf
fi
fi
fi
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