dd if=/dev/zero of=/tmp/lol/disk.img bs=1M count=2048
mkfs.ext4 /tmp/lol/disk.img
cp --sparse=never /tmp/lol/disk.img /tmp/lol/disk2.img
rm -f /tmp/lol/disk.img

losetup /dev/loop7 /tmp/lol/disk2.img
mount -o loop /tmp/lol/disk2.img /usr/lib/lxc/root
umount /usr/lib/lxc/root
losetup -d /dev/loop7
rm -f /tmp/lol/disk2.img