#!/bin/sh

set -e

case "$1" in
  configure)
    # New packaging paradigm for my.cnf handling among MySQL variants
    # Used in Ubuntu since Dec-2014 and in Debian since Jul-2015
    #
    # If the new mysql-common package does not provide
    # the update-alternatives facility, notify user about manual fall back
    if [ -f /usr/share/mysql-common/configure-symlinks ]
    then
      /usr/share/mysql-common/configure-symlinks install mariadb "/etc/mysql/mariadb.cnf"
    else
      # As configure can be called many times, don't re-create the symlink
      # if it is there already
      if [ ! -L /etc/mysql/my.cnf ]
      then
        echo "Notice: configure-symlinks trigger could not be called."
        echo "Please manually create symlinks by running: "
        echo "  mv -f /etc/mysql/my.cnf /etc/mysql/my.cnf.old"
        echo "  ln -sf mariadb.cnf /etc/mysql/my.cnf"
      fi
    fi

    # Note that MySQL in Debian runs the configure-symlinks from the
    # mysql-server-x.x.postinst and postrm files, while the MySQL.com (and
    # Percona.com) packaging triggers update-alternatives directly form the
    # mysql-common (and percona-x-common) package using priority 200.
    #
    # Thus, we need to ensure here that mariadb.cnf indeed became the primary
    # alternative and override with priority 500 if needed.
    if ! update-alternatives --query my.cnf | grep --quiet "Value: /etc/mysql/mariadb.cnf"
    then
      update-alternatives --install /etc/mysql/my.cnf my.cnf "/etc/mysql/mariadb.cnf" 500 || true
    fi
  ;;
esac