#!/bin/bash

FTP_CREDS="/root/backup/ftpserver.login"

BACKUP_SYSTEM="bin boot dev lib mnt opt sbin usr"
BACKUP_CONFIG="etc"
BACKUP_USER="home root"
BACKUP_VAR="var"

# ------------------

umask 0077
TODAY=`date +%Y-%m-%d`
OLDDAY=`date +%Y-%m-%d -d '-6 months'`
TMPDIR=`mktemp -d`

# ------------------

function create_backup {
    echo "## "`date`
    target=$1
    shift
    rm -rf $target
    tar --totals -czpf $target -C / $@ 2>&1
    /usr/bin/md5sum -b $target
    echo
}

function ftp_push_delete {
    echo "## "`/bin/date`
    target=$1
    shift

    # workaround -X %s bug in ncftpput (do not use absolute local paths)
    pushd . &> /dev/null
    cd $TMPDIR
    for file in $@; do
        files="$files `/usr/bin/basename $file`"
    done
    /usr/bin/ncftpput -V -X "SITE CHMOD 600 %s" -f $FTP_CREDS $target $files
    popd &> /dev/null
    # end workaround

    echo
}

function ftp_list {
    echo "## "`date`
    ftp_host=`/usr/bin/awk '/host/{ print $2 }' $FTP_CREDS`
    /usr/bin/ncftpls -l -f $FTP_CREDS ftp://${ftp_host}/
    echo
}

function ftp_delete {
    echo "delete $1"
    ftp_host=`/usr/bin/awk '/host/{ print $2 }' $FTP_CREDS`
    /usr/bin/ncftpls -l -f $FTP_CREDS -X "DELE $1" ftp://${ftp_host}/ &> /dev/null
}

# ------------------

create_backup $TMPDIR/backup-${TODAY}-system.tar.gz $BACKUP_SYSTEM
create_backup $TMPDIR/backup-${TODAY}-config.tar.gz $BACKUP_CONFIG
create_backup $TMPDIR/backup-${TODAY}-user.tar.gz $BACKUP_USER
create_backup $TMPDIR/backup-${TODAY}-var.tar.gz $BACKUP_VAR

ftp_push_delete / $TMPDIR/backup-${TODAY}-*.tar.gz

ftp_delete backup-${OLDDAY}-system.tar.gz
ftp_delete backup-${OLDDAY}-config.tar.gz
ftp_delete backup-${OLDDAY}-user.tar.gz
ftp_delete backup-${OLDDAY}-var.tar.gz

ftp_list

echo "FTP backup completed."
rm -rf $TMPDIR