if [[ $(command -v my_print_defaults >/dev/null 2>&1) ]]; then
  datadir=$(my_print_defaults mysqld | sed -n "s/^--datadir=//p")
fi
[[ -z "${datadir}" ]] && datadir=/var/lib/mysql 

post_install(){
  groupadd -g 89 mysql &>/dev/null
  useradd -u 89 -g mysql -d "${datadir}" -s /bin/false mysql &>/dev/null

  if [[ ! -e "${datadir}" ]]; then
    install -dm700 "${datadir}"
    usr/bin/mysqld --initialize-insecure --user=mysql --basedir=/usr --datadir=${datadir}
    chown -R mysql:mysql var/lib/mysql &>/dev/null
  fi

  usr/bin/systemd-tmpfiles --create mysqld.conf
}

post_upgrade(){
  getent group mysql >/dev/null 2>&1 || groupadd -g 89 mysql &>/dev/null
  getent passwd mysql >/dev/null 2>&1 || useradd -u 89 -g mysql -d "${datadir}" -s /bin/false mysql &>/dev/null

  if [ "$(vercmp $2 5.6)" -lt 0 ]; then
    echo " >> "
    echo " >> Major version update. Consider restart the service, and then running mysql_upgrade after it."
    echo " >> "
  fi
}

post_remove(){
  if getent passwd mysql >/dev/null 2>&1; then
    userdel mysql
  fi
  if getent group mysql >/dev/null 2>&1; then
    groupdel mysql
  fi
}