#! /bin/sh

FTP_SERVER=backup.serverkompetenz.de
BAK_PATH=backup/full
BAK=$1

WGET=$(whereis wget)
if [ $? != 0 ] ; then
	echo "Unable to find wget executeable." >&2
	exit 4
fi

CURL=$(whereis curl)
if [ $? != 0 ] ; then
	echo "Unable to find curl executeable." >&2
	exit 4
fi

NCFTPPUT=$(whereis ncftpput)
if [ $? != 0 ] ; then
	echo "Unable to find ncftpput executeable." >&2
	exit 4
fi

if [ -z ${BAK} ]; then
	echo "USAGE: `basename $0` BAK_DIR" >&2
	exit 1
fi

# Only root can do this...
if [ "`id -u`" -ne 0 ]; then
	echo "`basename $0`: Need to be root to backup data." >&2
	exit 2
fi

if [ ! -e /root/.ncftplogin ]; then
	echo "`basename $0`: missing login credentials in /root.ncftplogin" >&2
	exit 3
fi

set -A FILES `${CURL} -s -n -l "ftp://${FTP_SERVER}/${BAK_PATH}/${BAK}/" \
		| grep -v '^\.' | grep -v '\.gz$'`
let RESULT=$?
if [ ${RESULT} != 0 ]; then
	echo "curl returned ${RESULT}"
	exit 5
fi

let IDX=0
while [ ${IDX} -lt ${#FILES[@]} ]; do
	FNAME=${FILES[IDX]}
	echo "Compressing ${FNAME}"

	${WGET} -q -O - "ftp://${FTP_SERVER}/${BAK_PATH}/${BAK}/${FNAME}" \
			| gzip -9 \
			| ${NCFTPPUT} -f /root/.ncftplogin -c ${FTP_SERVER} "${BAK_PATH}/${BAK}/${FNAME}.gz"
	let RESULT=$?
	if [ ${RESULT} != 0 ]; then
		echo "Unable to compact ${BAK_PATH}/${BAK}/${FNAME}"
	else
		/usr/bin/ftp <<-EOF
		open ${FTP_SERVER}
		epsv
		binary
		verbose
		prompt
		cd "${BAK_PATH}/${BAK}"
		del "${FNAME}"
EOF
	fi
	IDX=$((IDX + 1))
done