PKGBUILDs/extra/cups/cups.install

post_install() {
    if [ -x usr/bin/xdg-icon-resource ]; then
      xdg-icon-resource forceupdate --theme hicolor 2> /dev/null
    fi
 echo ">> If you use an HTTPS connection to CUPS, the first time you access"
 echo ">> the interface it may take a very long time before the site comes up."
 echo ">> This is because the first request triggers the generation of the CUPS"
 echo ">> SSL certificates which can be a very time-consuming job."
}

post_upgrade() {
    if [ -x usr/bin/xdg-icon-resource ]; then
      xdg-icon-resource forceupdate --theme hicolor 2> /dev/null
    fi
  
  if [ "`vercmp $2 2.0.0-1`" -lt 0 ]; then
    # important upgrade notice
    echo "> systemd unit names have been renamed"
    echo "> you should systemctl stop and disable cups.service and"
    echo "> systemctl daemon-reload, start and enable org.cups.cupsd.service"
  fi
}

post_remove() {
    if [ -x usr/bin/xdg-icon-resource ]; then
      xdg-icon-resource forceupdate --theme hicolor 2> /dev/null
    fi
}