postinst 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 21 22 23 24 25 26 27 | #!/bin/sh
set -e
case "$1" in
  configure)
    if dpkg --compare-versions "$2" lt 1.4.1; then
      cp /etc/nginx/naxsi-ui.conf.1.4.1 /etc/nginx/naxsi-ui.conf
    fi
    ;;
  abort-upgrade|abort-remove|abort-deconfigure)
  ;;
  *)
    echo "postinst called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac
# Automatically added by dh_installinit
if [ -x "/etc/init.d/nginx-naxsi-ui" ]; then
	if [ ! -e "/etc/init/nginx-naxsi-ui.conf" ]; then
		update-rc.d nginx-naxsi-ui defaults >/dev/null
	fi
fi
# End automatically added section
exit 0
 |