preinst is in nginx-naxsi-ui 1.4.6-1ubuntu3.
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
set -e
case "$1" in
upgrade)
if dpkg --compare-versions "$2" lt 1.4.1; then
mv /etc/nginx/naxsi-ui.conf /etc/nginx/naxsi-ui.conf.before_upgrade_to_1.4.1
fi
;;
install|abort-upgrade)
;;
*)
echo "preinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
exit 0
|