preinst is in openarena-server 0.8.8-9.
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 28 | #!/bin/sh
set -e
case "$1" in
  (upgrade)
    if dpkg --compare-versions "$2" lt 0.8.8; then
      def=/etc/default/openarena-server
      home=/var/games/openarena-server
      inhibit=$home/init-script-disabled-by-upgrade
      if test -e $def && grep '^START_DAEMON=1$' $def; then
        echo "Not disabling openarena-server init script (previously enabled in $def)" >&2
      else
        echo "Disabling openarena-server init script (previously disabled in $def)" >&2
        echo "Remove $inhibit to restore normal behaviour."
	install -d $home
	touch $inhibit
      fi
    fi
  ;;
  (install|abort-upgrade)
  ;;
  *)
    echo "preinst called with unknown argument '$1'" >&2
    exit 1
  ;;
esac
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