#!/bin/bash
set -e

#init some vars. This should move to a config file sometime.
use_dataq="NO"
ip_of_backupserver="192.168.2.2"
my_hostname=`hostname`
mac_of_backupserver="00:60:08:6E:7A:27"
dataq_host="192.168.2.2"
dataq_user="dataq"
dataq_password="dataq"
dataq_port="50000"
dataq_queue="backup"
keep_time="30D"

#give the user a change to abort
read -t10 -n1 -s -p "Press Q to cancel automatic backup. If no input for 10 seconds we will backup anyway." || true

if [ "$REPLY" == "Q" ]; then
	echo ""
	echo "user aborted"
	exit 1
else
	echo ""
	echo "Starting backup run."
fi


#check if my server is here
#first run a ping to fill arp table. Thnx Ferry Boender for this tip.
uselessvar=`ping -q -c1 $ip_of_backupserver`
#now check the hardware address
arpreq=`arp -a $ip_of_backupserver | cut -d " " -f 4`
if [ "$arpreq" == "$mac_of_backupserver" ]; then
	echo "mac address ok, checking status..."
else
	echo "mac address not ok, bailing out."
	exit 1
fi

#check if backups are allowed by the server
#only if $use_dataq = YES
if [ "$use_dataq" == "YES" ]; then
	serverstatus=`echo "PEEK $dataq_user:$dataq_password@$dataq_queue" | nc6 $dataq_host $dataq_port`
	if [ "$serverstatus" == "allowed" ]; then
		echo "server reported ok, starting backup..."
	else
		echo "server reported not allowed to make backus, bailing out."
		exit 1
	fi
fi

#do the backup
#add all the dirs you want to backup here

rdiff-backup --terminal-verbosity 0 /home $ip_of_backupserver::/var/backups/remote/$my_hostname/home
rdiff-backup --terminal-verbosity 0 /etc $ip_of_backupserver::/var/backups/remote/$my_hostname/etc

#cleanup
#since rdiff-backup cannot do backup and cleanup in one run, we have to do it here.
#all dirs you specified above should be listed here

rdiff-backup --force --remove-older-than $keep_time $ip_of_backupserver::/var/backups/remote/$my_hostname/home >/dev/null 2>&1 || true
rdiff-backup --force --remove-older-than $keep_time $ip_of_backupserver::/var/backups/remote/$my_hostname/etc >/dev/null 2>&1 || true

echo "Backup completed"