post_install() {
  # lpr
  /opt/brother/Printers/dcpj577n/inf/setupPrintcapij dcpj577n -i

  # cupswrapper
  /opt/brother/Printers/dcpj577n/cupswrapper/cupswrapperdcpj577n

  systemctl restart org.cups.cupsd.service
}

post_upgrade() {
  /bin/true
}

pre_remove() {
  # lpr
  /opt/brother/Printers/dcpj577n/inf/setupPrintcapij dcpj577n -e

  # cupswrapper
  /opt/brother/Printers/dcpj577n/cupswrapper/cupswrapperdcpj577n -e
}

op=$1
shift

$op "$@"