preinst is in dns-flood-detector 1.20-2.
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 | #!/bin/sh
set -e
# generate correct pid file, for versions where was non or incorrect
if [ "$1" = "upgrade" ] && [ "$2" ] && dpkg --compare-versions "$2" <= "1.12-1"; then
pidof dns-flood-detector > /var/run/dns-flood-detector.pid
fi
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