[ -n "$packages" ] && yum -c ${vdir}/etc/yum.conf --installroot=${vdir} -y install $packages
[ -n "$groups" ] && yum -c ${vdir}/etc/yum.conf --installroot=${vdir} -y groupinstall $groups
[ -n "$packages" ] && yum -c ${vdir}/etc/yum.conf --installroot=${vdir} -y install $packages
[ -n "$groups" ] && yum -c ${vdir}/etc/yum.conf --installroot=${vdir} -y groupinstall $groups