Percona full and incremental backup script

#!/bin/sh
INNOBACKUPEX=innobackupex
INNOBACKUPEXFULL=/usr/bin/$INNOBACKUPEX
USEROPTIONS="--user=mysqlbackup --password=****** --socket=/tmp/mysql.sock"
TMPFILE="/tmp/innobackupex-runner.$$.tmp"
MYCNF=/etc/my.cnf
MYSQL=/usr/local/mysql/bin/mysql
MYSQLADMIN=/usr/local/mysql/bin/mysqladmin
BACKUPDIR=/data/storage/
FULLBACKUPDIR=$BACKUPDIR/full
INCRBACKUPDIR=$BACKUPDIR/incr
FULLBACKUPLIFE=86400 #full backup interval Time:seconds
KEEP=7 # keep how many full backup files
# Grab start time
STARTED_AT=`date +%s`
#############################################################################
# Display error message and exit
#############################################################################
error()
{
    echo "$1" 1>&2
    exit 1
}
# Check options before proceeding
if [ ! -x $INNOBACKUPEXFULL ]; then
  error "$INNOBACKUPEXFULL does not exist."
fi
if [ ! -d $BACKUPDIR ]; then
  mkdir $BACKUPDIR
  #error "Backup destination folder: $BACKUPDIR does not exist."
fi
if [ -z "`$MYSQLADMIN $USEROPTIONS status | grep 'Uptime'`" ] ; then
 error "HALTED: MySQL does not running."
fi
if ! `echo 'exit' | $MYSQL -s $USEROPTIONS` ; then
 error "User name or password is wrong."
fi
# Some info output
echo "----------------------------"
echo
echo "$0: MySQL backup script"
echo "started: `date`"
echo
# Create full and incr backup directories if they not exist.
mkdir -p $FULLBACKUPDIR
mkdir -p $INCRBACKUPDIR
# Find latest full backup
LATEST_FULL=`find $FULLBACKUPDIR -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -1`
# Get latest backup last modification time
LATEST_FULL_CREATED_AT=`stat -c %Y $FULLBACKUPDIR/$LATEST_FULL`
# Run an incremental backup if latest full is still valid. Otherwise, run a new full one.
if [ "$LATEST_FULL" -a `expr $LATEST_FULL_CREATED_AT + $FULLBACKUPLIFE + 5` -ge $STARTED_AT ] ; then
  # Create incremental backups dir if not exists.
  TMPINCRDIR=$INCRBACKUPDIR/$LATEST_FULL
  mkdir -p $TMPINCRDIR
  # Find latest incremental backup.
  LATEST_INCR=`find $TMPINCRDIR -mindepth 1 -maxdepth 1 -type d | sort -nr | head -1`
  # If this is the first incremental, use the full as base. Otherwise, use the latest incremental as base.
  if [ ! $LATEST_INCR ] ; then
    INCRBASEDIR=$FULLBACKUPDIR/$LATEST_FULL
  else
    INCRBASEDIR=$LATEST_INCR
  fi
  echo "Running new incremental backup using $INCRBASEDIR as base."
  $INNOBACKUPEXFULL --defaults-file=$MYCNF $USEROPTIONS --incremental $TMPINCRDIR --incremental-basedir $INCRBASEDIR > $TMPFILE 2>&1
else
  echo "Running new full backup."
  $INNOBACKUPEXFULL --defaults-file=$MYCNF $USEROPTIONS $FULLBACKUPDIR > $TMPFILE 2>&1
fi
if [ -z "`tail -1 $TMPFILE | grep 'completed OK!'`" ] ; then
 echo "$INNOBACKUPEX failed:"; echo
 echo "---------- ERROR OUTPUT from $INNOBACKUPEX ----------"
 cat $TMPFILE
 rm -f $TMPFILE
 exit 1
fi
THISBACKUP=`awk -- "/Backup created in directory/ { split( \\\$0, p, \"'\" ) ; print p[2] }" $TMPFILE`
rm -f $TMPFILE
echo "Databases backed up successfully to: $THISBACKUP"
echo
# Cleanup
echo "Cleanup. Keeping only $KEEP full backups and its incrementals."
AGE=$(($FULLBACKUPLIFE * $KEEP / 60))
find $FULLBACKUPDIR -maxdepth 1 -type d -mmin +$AGE -execdir echo "removing: "$FULLBACKUPDIR/{} \; -execdir rm -rf $FULLBACKUPDIR/{} \; -execdir echo "removing: "$INCRBACKUPDIR/{} \; -execdir rm -rf $INCRBACKUPDIR/{} \;
echo
echo "completed: `date`"
exit 0