#!/bin/bash

#Customize the following variables for your environment
CONTROLLER_HOME="/opt/AppDynamics/Controller" 
DESTINATION="/opt/AppDynamics/backup"

#Derived constants
DATECODE=`date +%Y%m%d`
# Set threads equal to core count on system
THREADS=`cat /proc/cpuinfo | grep processor | wc -l`

### Critical sanity checks

if ! ( [ -d "$CONTROLLER_HOME" ] && [ -d "$DESTINATION" ] )
	then
	>&2 echo "$CONTROLLER_HOME and/or $DESTINATION do not exist or are not directories."
	exit 2
fi

DATADIR=`grep ^datadir $CONTROLLER_HOME/db/db.cnf | cut -d = -f 2`

if [ -e "$DATADIR/test" ]
	then
	>&2 echo "$DATADIR/test exists and will interfere with the correct operation
of Xtrabackup.  Please make sure you can remove it safely, and re-run this
script"
	exit 3
fi

if ! [[ -x `which innobackupex` ]]
	then
	echo "Percona Xtrabackup is not installed on this host."
	[ -e /etc/redhat-release ] && >&2 echo "\
Please set up the Percona yum repository
http://www.percona.com/doc/percona-xtrabackup/2.2/installation/yum_repo.html
and run \"yum install percona-xtrabackup qpress\""
	[ -e /etc/debian-version ] && >&2 echo "\
Please set up the Percona apt repository
http://www.percona.com/doc/percona-xtrabackup/2.2/installation/apt_repo.html
and run \"apt-get install percona-xtrabackup qpress\""
	exit 4
fi

### End Sanity checks

# Run the backup with "nice -n 10" to keep the backup from interfering with the 
#  running controller
nohup nice -n 10 innobackupex \
 --defaults-file=$CONTROLLER_HOME/db/db.cnf --user=root --password=`cat \
 $CONTROLLER_HOME/db/.rootpw` --stream=xbstream --socket=/tmp/mysql.sock \
 --compress --parallel=$THREADS --compress-threads=$THREADS --lock-wait-timeout=1200 \
 $DESTINATION > \
 "$DESTINATION"/controller-$DATECODE.xbstream 2> "$DESTINATION"/controller-$DATECODE.log

if [ "$?" == "0" ] #backup completed successfully
	then
	# call your enterprise backup client to pick up "$DESTINATION"/controller-$DATECODE.xbstream
	#
	# remove "$DESTINATION"/controller-$DATECODE.xbstream if the backup client returns success?
	echo "Backup completed successfully"
	exit 0 # exit and return success
else
	# send an email to the controller admin and maybe attache $DESTINATION/controller-$DATECODE.log
	echo "Backup failed.  Please see $DESTINATION/controller-$DATECODE.log for more details."
	exit 1 # exit and return failure
fi