#!/bin/bash

if [ -z "$1" ]; then
	echo usage: $0 configfile
	exit -1
fi

if [ ! -f $1 ]; then
	echo configfile $1 is not a file
	exit -2
fi

config=$1

host=`grep ^host $config | cut -d ' ' -f 2`
user=`grep ^user $config | cut -d ' ' -f 2`
homedirs="` grep ^homedirs $config | cut -d ' ' -f 2-`"
extradirs="`grep ^extradirs $config | cut -d ' ' -f 2-`" 
replicas=`grep ^replicas $config | cut -d ' ' -f 2`
oldest=`grep ^oldest $config | cut -d ' ' -f 2`
data=`grep ^data $config | cut -d ' ' -f 2`
bandwidth=`grep ^bandwidth $config | cut -d ' ' -f 2`

ping -c1 $host > /dev/null 2>&1
ret=$?

if [ "$ret" = "0" ]; then
	echo "host $host is online ..."
else
	echo "host $host unreachable ..."
	exit -3
fi

if [ ! -d $data ]; then
	echo "no data directory ..."
	exit -4
fi

today=`date -I`
backupdir=$data/${user}_at_${host}

cbd=$backupdir/$today
mkdir -p $cbd

rsync="rsync -azR --delete --bwlimit=$bandwidth"

ob=""
for pb in $backupdir/[0-9]*; do
	bdd=`basename $pb`
	if [ ! -f $backupdir/.$bdd ]; then
		if [ "$pb" != "$cbd" ]; then
			rm -rf $cbd
			mv $pb $cbd
		fi

		rsrc=""
		for dir in $homedirs; do
			rsrc="$rsrc :/home/$user/$dir"
		done
		rsrc="`echo $rsrc | sed 's/^\ //'`"
		for dir in $extradirs; do
			rsrc="$rsrc :$dir"
		done
		$rsync $user@$host$rsrc $cbd
		ret=$?
		[ "$ret" != "0" ] && exit -50
		touch $backupdir/.$pb
	fi
	ob="$ob $pb"
done

cob=`echo $ob | wc -w`
if [ $cob -gt $replicas ]; then
	((numdel=cob-replicas))
	todel="`echo $ob | cut -d ' ' -f 1-${numdel}`"
	echo "to delete: $todel"
	#for dirdel in $todel; do
	#	bdd=`basename $dirdel`
	#	rm -r $dirdel
	#	rm $backupdir/$bdd
	#done
fi

exit 0