#!/bin/sh
#
# Upgrade mysql databases
#
# Usage: mysql_db_upgrade [ --backup [ --force ] | --restore ]
#
# Options:
#   --backup  directs the tool to perform a backup of all existing
#             databases in the /var/mysql directory.  This option 
#             is used prior to upgrading the Mac OS X Server.
#   --backup  directs the tool to perform a restore of the database
#             backup into the /var/mysql directory.  This option
#             is used after the Mac OS X Server 10.5 upgrade has
#             been installed.
#   --force   (for --backup only) when executed from the command 
#             line, causes the tool to ignore the automatic database 
#             backup size limit and perform the backup on larger
#             databases.
# 
# Description:
#
# This tool imports the existing mysql-4.x database into mysql-5.0. The 
# tool runs automatically after upgrade installations of Mac OS X 
# Server 10.5.  The automatic upgrade will only execute for small 
# databases (50 MBytes or less).  Upgrades of larger databases may 
# be enabled by executing the tool with the --force option.
#
# NOTE: Currently, this tool is not installed with any version of 10.5 
#       server.  Inclusion of this tool in the build has been withheld 
#       pending testing and verification of it's functionality.  
#
#       In the interim, upgrade instructions for 4.0/4.1 to 5.0 MySQL
#       versions can be found at:
#       <http://docs.info.apple.com/article.html?artnum=306725
#
#

	DB_PATH=/var/mysql
	DB_UPGRADE_PATH=/var/mysql.4.1
	DB_TMP_PATH=${DB_PATH}/tmp
	MYSQLDUMP=/usr/bin/mysqldump
	AUTO_UPGRADE_MIN_DB_SIZE=50

	# Is it possible to perform in-place migrations?
	# The docs seem to imply this.  See:
	# mysql_fix_privilege_tables 
	# mysqlcheck --check-upgrade --all-databases --auto-repair

	doUpgrade=0
	while ( test "x-${1}" != "x-" ); do
		case ${1} in
			--force)
				doUpgrade=1
				;;
			*)
				echo "????: unknown option \"${1}\""
				;;
		esac
		shift
	done

	logger "Upgrading mysql databases"

	# We will only do database conversion for sizes less than n MB
	#	- where 'n' is TBD based upon performance
	#	- for now the defalut is 50MB

	if [ ! -d ${DB_PATH} ] ; then
		 logger "No mysql database found, skipping automatic conversion."
		 exit 0
	fi

	DB_SIZE=`du -m -d 0 ${DB_PATH} | sed -n -e "s/[^0-9]*\([0-9]*\).*/\1/p"`
	if [ $DB_SIZE -lt $AUTO_UPGRADE_MIN_DB_SIZE ] ; then
		doUpgrade=1
	fi
	
	if [ ${doUpgrade} -eq 1 ]; then
		 if [ ! -d "${DB_TMP_PATH}" ] ; then
			mkdir -p "${DB_TMP_PATH}"
		 fi
		 chown _mysql:staff "${DB_TMP_PATH}"
		 ${MYSQLDUMP} --all-databases --tab="${DB_TMP_PATH}"

		 # Now move old db files out of the way and init new
		 mv ${DB_PATH} ${DB_UPGRADE_PATH}
		 mkdir -p ${DB_PATH}
		 chown _mysql:staff ${DB_PATH}

		 # TBD: Need to do mysql initialization and create default files

		 # create database
		 mysqladmin create mysql
		 # create tables in database
		 cat ${DB_UPGRADE_PATH}/tmp/*.sql | mysql mysql
		 # load data into tables
		 mysqlimport mysql ${DB_UPGRADE_PATH}/tmp/*.txt
	else
		 # db too big move it out of the way for now
		 logger "MySQL database too large for automatic migration"
		 logger "Moving to ${DB_UPGRADE_PATH}"
		 mv ${DB_PATH} ${DB_UPGRADE_PATH}
	fi