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 $datadir
    usr/bin/mysql_install_db --user=mysql --basedir=/usr --datadir=$datadir
    chown -R mysql:mysql var/lib/mysql &>/dev/null
  fi

  usr/bin/systemd-tmpfiles --create mysql.conf

  echo ">> If you are migrating from MySQL, don't forget to run 'mysql_upgrade'"
  echo "     after mysqld.service restart." 
}

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 5.5.25-4)" -lt 0 ]] && [[ -d /data ]]; then
    for x in data/*; do
      cp -r $x $datadir/
    done
    rm -rf data
  fi

  if [[ "$(vercmp $2 5.5.25-5)" -lt 0 ]]; then
    echo ">> mysql.service has been renamed to mysqld.service to keep"
    echo "    consistency with MySQL package." 
  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
}