postinst 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 29 30 31 32 | #!/bin/sh
set -e
case "$1" in
  configure)
    if ! getent passwd Debian-openarena >/dev/null; then
      adduser --disabled-password --quiet --system \
        --home /var/games/openarena-server --no-create-home \
        --gecos "OpenArena dedicated server" \
	--ingroup games --force-badname Debian-openarena
    fi
    install -d /var/games
    install -d /var/games/openarena-server
    chown Debian-openarena:games /var/games/openarena-server
  ;;
  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/openarena-server" ]; then
	if [ ! -e "/etc/init/openarena-server.conf" ]; then
		update-rc.d openarena-server defaults >/dev/null
	fi
	invoke-rc.d openarena-server start || exit $?
fi
# End automatically added section
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