post_install() {
  if ! getent group transmission &>/dev/null; then
    groupadd -g 169 transmission >/dev/null
  fi
  if ! getent passwd transmission &>/dev/null; then
    useradd -c 'Transmission BitTorrent Client' -u 169 -g transmission -b '/var/lib' -m -s /bin/nologin transmission >/dev/null
  fi
  passwd -l transmission >/dev/null
  transmission_shell=$(getent passwd transmission | cut -d: -f7)
  if [ "$transmission_shell" != '/bin/nologin' ]; then
    chsh -s /bin/nologin transmission &>/dev/null
  fi
}

post_upgrade() {
  post_install
}

post_remove() {
  if getent passwd transmission &>/dev/null; then
    userdel transmission >/dev/null
  fi
  if getent group transmission &>/dev/null; then
    groupdel transmission >/dev/null
  fi
}