#!/bin/sh

if [[ $(date +%u) -gt 4 ]] ; then
    echo 'Sorry, you cannot run this program today.'
    exit
fi

#figure out how many VMs we have, and figure out how many to backup each day of the week
TOTAL=`vzlist -H -o ctid|wc -l`
DAILY=$(($TOTAL/5))

# if Monday, backup first set of $SET number of VMs, if tuesday then second set, etc...
DAY="$(date +'%u')"
if [ $DAY -eq 1 ]
	then
		NUM1=1
		NUM2=$(($NUM1 + $DAILY))
	else
		NUM1=$((($DAILY * $DAY) + 1))
		NUM2=$(($NUM1 + $DAILY))
fi

# Get list of all VMs, removing leading whitespace
for VM in `vzlist -H -o ctid | sed 's/^[ \t]*//' | sed -n "$NUM1,$NUM2 p"`; do vzdump --suspend $VM --tmpdir /vz/dump/tmp; done