#!/bin/bash

# ibackup.com destination
IBACKUP_DEST=$1

# database names
DB_NAMES=$2

# binaries we need
MYSQLDUMP=/usr/bin/mysqldump
GZIP=/bin/gzip
GPG=/usr/bin/gpg
RSYNC=/usr/bin/rsync
STUNNEL=/usr/bin/stunnel4

# password for ibackup.com
#
# format of $HOME/.ibackup is
#
# IBACKUP_USERNAME=username
# IBACKUP_PASSWORD=password
# GPG_EMAIL=your@email.com
DOTIBACKUP="$HOME/.ibackup"

if [ ! -r $DOTIBACKUP ]; then
	echo "Need $DOTIBACKUP file for username and password!"
	exit 1
else
	PERMS=`/bin/ls -l $DOTIBACKUP | /usr/bin/awk '{print $1}'`
fi

if [ $PERMS != "-rw-------" ]; then
	echo "Permissions on $DOTIBACKUP are wrong!"
	echo "Should be -rw-------, actually is $PERMS"
	exit 1
fi

. $DOTIBACKUP
export RSYNC_PASSWORD=$IBACKUP_PASSWORD

# local stunnel4 port
STUNNEL_PORT=`/bin/grep 'accept' /etc/stunnel/ibackup.conf | awk '{print $3}'`

# place to dump everything
DUMPDIR="$HOME/.ibackup_data"

if [ ! -d $DUMPDIR ]; then
	mkdir $DUMPDIR
fi

# today, for tagging the dumpfile
DATE=`/bin/date +%Y-%m-%d`

# yesterday, and the day before that
ONEDAYAGO=`/bin/date -d '1 day ago' +%Y-%m-%d`
TWODAYSAGO=`/bin/date -d '2 days ago' +%Y-%m-%d`

if [ "x$DB_NAMES" == "x" ]; then
	echo "Need argument for db name(s)!"
	exit 1
fi

if [ ! -x $MYSQLDUMP ]; then
	echo "Need $MYSQLDUMP!"
	exit 2
fi

if [ ! -x $GZIP ]; then
	echo "Need $GZIP!"
	exit 3
fi

if [ ! -x $GPG ]; then
	echo "Need $GPG!"
	exit 4
fi

if [ ! -x $RSYNC ]; then
	echo "Need $RSYNC!"
	exit 5
fi

if [ ! -x $STUNNEL ]; then
	echo "Need $STUNNEL!"
	exit 6
fi

cd $DUMPDIR

echo -n "dumping $DB_NAMES to $DUMPDIR/$IBACKUP_DEST-$DATE.mysql... "
$MYSQLDUMP --opt --databases $DB_NAMES > $IBACKUP_DEST-$DATE.mysql
echo "done!"

echo -n "gzipping $DUMPDIR/$IBACKUP_DEST-$DATE.mysql... "
$GZIP $DUMPDIR/$IBACKUP_DEST-$DATE.mysql
echo "done!"

echo -n "encrypting $DUMPDIR/$IBACKUP_DEST-$DATE.mysql... "
$GPG -e -r $GPG_EMAIL $DUMPDIR/$IBACKUP_DEST-$DATE.mysql.gz
echo "done!"

if [ $? -ne 0 ]; then
    echo "encryption failed!"
    exit 7
fi

echo -n "removing $DUMPDIR/$IBACKUP_DEST-$DATE.mysql.gz... "
/bin/rm -fv $DUMPDIR/$IBACKUP_DEST-$DATE.mysql.gz
echo "done!"

echo "Starting stunnel for rsync..."
/etc/init.d/stunnel4 start

$RSYNC -r -v -z -t --delete-after --exclude $IBACKUP_DEST-$ONEDAYAGO* --exclude $IBACKUP_DEST-$TWODAYSAGO* $DUMPDIR/ $IBACKUP_USERNAME@localhost::ibackup/$IBACKUP_DEST --port $STUNNEL_PORT

echo "Stopping stunnel for rsync..."
/etc/init.d/stunnel4 stop

echo -n "Cleaning up... "
/bin/rm -rfv $DUMPDIR
echo "done!"