#!/bin/bash
# this script will backup all mysql databases from the server to a ftp
# server

# mysql server informations
MYSQL_SERVER="localhost"
MYSQL_USER="backup"
MYSQL_PASSWORD="password"

# databases to exclude, seperated by space
# TODO
#MYSQL_EXCLUDE_DB=""

# ftp server data
FTP_SERVER="backup"
FTP_USER="ftp"
FTP_PASSWORD="password"

# target directory on the ftp (if no / at the beginning, relativ to
# the first directory after login)
FTP_TARGET="mysql"

# temporary directory
TMP_DIRECTORY="/tmp"

# backup name
BACKUP_PREFIX="$(hostname -f)_${MYSQL_SERVER}_$(date +%F)_"

# logging
LOGGING="0"

## end of configuration

log() {
    if [ $LOGGING -eq 0 ]; then
	echo "$@"
    fi 
}

# check for tools
for prog in mysqlshow mysqldump ncftpput
do 
    if ! hash $prog 2>/dev/null ; then
	echo "Error: This script needs: $prog. Exiting..." >&2
	exit 1
    fi
done

echo "Started backup of mysql databases ($(date +%c)):" | log
echo | log

# create temporary dir
TMP_DIR=$(mktemp -d --tmpdir=${TMP_DIRECTORY})
pushd ${TMP_DIR} >/dev/null 2>&1

# enumerate all mysql databases
MYSQL_DATABASES=$(mysqlshow -h${MYSQL_SERVER} -u${MYSQL_USER} \
    -p${MYSQL_PASSWORD} | awk '{ print $2 }' | grep -v "^$" | sed \
    '1d')

# backup all databases to file
for db in ${MYSQL_DATABASES}
do
    mysqldump -h${MYSQL_SERVER} -u${MYSQL_USER} -p${MYSQL_PASSWORD} \
	${db} | bzip2 -zc > "${BACKUP_PREFIX}_${db}.sql.bz2"
done

# echo created log
du -sch * | log

# move backups to ftp server
for file in *
do
    ncftpput -u${FTP_USER} -p${FTP_PASSWORD} -DD ${FTP_SERVER} \
	${FTP_TARGET} ${file} >/dev/null
done

# restore old cwd
popd >/dev/null 2>&1
rmdir ${TMP_DIR}