post_install() {
  if [[ -z $(getent group blackfire-agent) ]]; then
    groupadd -g 487 blackfire-agent
  fi
  if [[ -z $(getent passwd blackfire-agent) ]]; then
    useradd -c 'Blackfire Agent user' -u 487 -g blackfire-agent -d / -s /usr/bin/nologin blackfire-agent
  fi
  passwd -l blackfire-agent > /dev/null

  echo "You need to configure your Blackfire credentials via: sudo -u blackfire-agent blackfire-agent -register"
}

post_upgrade() {
  post_install
}

post_remove() {
  if [[ -n $(getent passwd blackfire-agent) ]]; then
    userdel blackfire-agent
  fi
  if [[ -n $(getent group blackfire-agent) ]]; then
    groupdel blackfire-agent
  fi
}