pre_install() {
  if [ ! `grep odoo /etc/group` ]; then
    groupadd odoo &>/dev/null;
  fi
  id odoo &>/dev/null || useradd -r -m -g odoo -d /var/lib/odoo  odoo
}

post_install() {
  systemctl --system daemon-reload
}

post_upgrade() {
  systemctl --system daemon-reload
}

post_remove() {
  userdel odoo &> /dev/null
  groupdel odoo &> /dev/null
  systemctl --system daemon-reload
}