#!/bin/sh
#
# MySQL backup script
# Set authorisation and host paramethers in homedir .my.cnf param. Read README.md
# 
# dnf install https://repo.percona.com/yum/percona-release-latest.noarch.rpm
# dnf install percona-xtrabackup-80.x86_64
# dnf install qpress
#
# xtrabackup --decompress --target-dir=/data/compressed/
#

usage()
{
        echo "Usage: mysql_xtrabackup.sh -d /var/backup -n daily [-c 10 -s --compress --compress-threads=6 -e test@domain.org]"
	    echo
       	echo "-d | --dir :: backup directory"
	    echo "-n | --name :: backup name"
        echo "-c | --copies :: number of copies to store (default: 10)"
        echo "-e | --email :: notification email"
        echo "-i | --ignore-database"
        echo "--compress-threads :: number of worker threads to compress. (default: 2)"
        echo "-q | --quiet :: silent mode"
        echo "--pid-file :: pid file default ${pidfile}"
        echo "-h | --help :: display this help"
}

error()
{

    echo -e "\033[0;31m${1}\e[00m" ;
    if ! [ "${email}" = "" ] ; then
        echo "ERROR: `hostname`, ${script}: ${1}" | mail -s "'ERROR: `hostname`, ${script}: ${1}'" ${email} ;
    fi
}

export PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin" ;

script="$(basename "$(test -L "${0}" && readlink "${0}" || echo "${0}")")" ;
pidfile="/tmp/`basename ${0}`.pid" ;


while [ "${1}" != "" ]; do
    case ${1} in
        -d | --dir )            shift
                                dir=${1} ;
                                ;;
	    -n | --name )		    shift
                               	name=${1} ;
                               	;;
       	-c | --copies )         shift
                                copies=${1} ;
                                ;;
	    -e | --email )          shift
                                email=${1} ;
                                ;;
        -i | --ignore-database ) shift
                                ignore_database=${1} ;
				                ;;
        --compress-threads )    shift
                                compress_threads=${1}
                                ;;
	    -q | --quiet )		    quiet=1
				                ;;
        --pid-file )		    shift
                                pidfile=${1}
                                ;;
        -h | --help )           usage ;
                                exit 0;
                                ;;
        * )                     echo "Uncnown option ${1}!" ;
                                usage ;
                                exit 1 ;
    esac
    shift
done

if [ "${copies}" = "" ] || [ ! -n "${copies}" ] || [ "${copies}" -le "0" ] ;
then
	copies=10 ;
fi

if [ "${compress_threads}" = "" ] || [ ! -n "${compress_threads}" ] || [ "${compress_threads}" -lt "0" ] ;
then
	compress_threads=2 ;
fi

if [ "${dir}" = "" ] || [ ! -d ${dir} ] ; then

	error "Directory '${dir}' does not exists!" ;
	exit 1 ;
fi

# sleep random 1-6 sec for crone
sleep `shuf -i0-9 -n1` ;

if [ -s ${pidfile} ] ; then
    
    error "ERROR: `hostname` script ${script} already running! Pid file \"${pidfile}\" exists!" ;
	exit 1 ;
fi

trap "rm -f ${pidfile} ;" EXIT INT KILL TERM SIGKILL SIGTERM SIGHUP ERR ;

echo $$ > ${pidfile} ;

prefix="mysql_xtrabackup.`hostname -s`.${name}";

if [ `ls -t ${dir} | grep ${prefix} | wc -l` -ge "${copies}" ] ; then
	
    i=1 ;
	
    for filename in `ls ${dir} | grep ${prefix} | sort -r` ; do
		if [ "${i}" -ge "${copies}" ] ; then
			rm -fr "${dir}/${filename}" ;
		fi
		i=$(expr $i + 1) ;
	done

fi

if [ ! "${quiet}" ] ; then
	echo "Starting database dump (`date +\"%H:%M:%S\"`)" ;
fi

dump_file_name="`realpath ${dir}`/${prefix}.`date +\"%y%m%d.%H%M%S\"`" ;

xtrabackup --backup --compress --rsync --slave-info --compress-threads=${compress_threads} --databases-exclude=${ignore_database} --target-dir=${dump_file_name} > /dev/null;

if [ ! "${quiet}" ] ; then
    echo "Dump completed (`date +\"%H:%M:%S\"`)..." ;
fi

rm -f ${pidfile} ;

## xtrabackup --decompress --target-dir=/data/compressed/