#!/bin/bash

[ $# -ne 5 ] && exit 6

DBHOST=${1}
DBUSER=${2}
DBPASS=${3}
DATABASE=${4}
BACKUP_DIR=${5}

BUG=`echo "${DATABASE}" | sed 's/ //g' | grep -i "^information_schema$"`
[ -n "${BUG}" ] && exit 0

MDUMP=`which mysqldump`
MSQL=`which mysql`

[ -z "${MDUMP}" ] && exit 200
[ -z "${BACKUP_DIR}" -o "${BACKUP_DIR}" == "/" ] && exit 200

[ -e "${BACKUP_DIR}/${DATABASE}" ] && rm -rf "${BACKUP_DIR}/${DATABASE}"
[ ! -e "${BACKUP_DIR}/${DATABASE}" ] && mkdir -p "${BACKUP_DIR}/${DATABASE}" >/dev/null

BUG_26121=`${MDUMP} --help | grep skip-lock-tables`

if [ -z "${BUG_26121}" ]; then
    FIX_26121="--lock-tables=0"
    else
    FIX_26121="--skip-lock-tables"
    fi

use_ip=$(echo "${DBHOST}" | egrep "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$")

if [ -z "${use_ip}" ]; then
    OPTS="-S ${DBHOST}"
    else
    OPTS="--host=${DBHOST}"
    fi

${MDUMP} --user="${DBUSER}" --password="${DBPASS}" ${OPTS} "${FIX_26121}" --quick --single-transaction --routines --skip-triggers --hex-blob --no-data ${DATABASE} | sed -e 's/\/\*\![0-9][0-9]* *DEFINER[^\*]*\*\///g' > ${BACKUP_DIR}/${DATABASE}/__structure.sql
[ $? -ne 0 ] && exit 101
${MDUMP} --user="${DBUSER}" --password="${DBPASS}" ${OPTS} "${FIX_26121}" --quick --single-transaction --triggers --hex-blob --no-data --skip-add-drop-table --no-create-info ${DATABASE} | sed -e 's/\/\*\![0-9][0-9]* *DEFINER[^\*]*\*\///g' > ${BACKUP_DIR}/${DATABASE}/__triggers.sql

TABLE_LIST=`${MSQL} --user="${DBUSER}" --password="${DBPASS}" ${OPTS} --disable-pager -B -e "show tables;" --skip-column-names -q --silent ${DATABASE}`
echo "${TABLE_LIST}" | while read TB; do
[ -n "${TB}" ] && ${MDUMP} --user="${DBUSER}" --password="${DBPASS}" ${OPTS} "${FIX_26121}" --quick --skip-add-drop-table --no-create-info ${DATABASE} ${TB} >${BACKUP_DIR}/${DATABASE}/${TB}.sql
done

tar -czf "${BACKUP_DIR}-${DATABASE}.tgz" "${BACKUP_DIR}/${DATABASE}" >/dev/null 2>&1
ret=$?
rm -rf "${BACKUP_DIR}" >/dev/null

exit ${ret}