preinst is in bitlbee-common 3.5.1-1build1.
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 | #!/bin/sh
set -e
NAME=bitlbee
PIDFILE=/var/run/$NAME.pid
# git revision 7949d5a introduced dh_systemd.
DH_SYSTEMD_REV="3.4.2+20160612+master+41-g7949d5a-git"
# if upgrading from something older (including 3.4.2), kill the old daemon.
# do this just once, this time, to allow systemd to manage it.
if [ "$1" = 'upgrade' ]; then
if dpkg --compare-versions $2 lt $DH_SYSTEMD_REV; then
# we may not have init scripts here
start-stop-daemon --oknodo --stop --quiet --pidfile $PIDFILE --name $NAME
fi
fi
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