Comment 9 for bug 1100545

Verified using latest released 12.04 image from raring under kvm:

$ imgurl="http://cloud-images.ubuntu.com/releases/precise/release-20130204/ubuntu-12.04-server-cloudimg-amd64-disk1.img"
$ deburl="https://launchpad.net/ubuntu/+source/cloud-init/0.6.3-0ubuntu1.5/+build/4312778/+files/cloud-init_0.6.3-0ubuntu1.5_all.deb"
$ isourl="https://bugs.launchpad.net/cloud-init/+bug/1037567/+attachment/3509468/+files/disk.config.gz"

$ wget $imgurl -O precise-amd64.img.dist
$ wget $deburl -O cloud-init.deb
$ wget $isourl -O cfgdisk.img.dist;

$ qemu-img convert -O qcow2 precise-amd64.img.dist disk1.img.dist
$ qemu-img create -f qcow2 -b disk1.img.dist patched.img.dist

$ zcat --force cfgdisk.img.dist > cfgdisk.img
$ chmod 600 cfgdisk.img disk1.img.dist

## patch the patched.img.dist with new cloud-init
$ bzr branch lp:~smoser/+junk/backdoor-image ./bi
$ sudo ./bi/mount-callback-umount patched.img.dist -- \
    sh -ec 'mp=$MOUNTPOINT; cp cloud-init.deb $mp/tmp &&
            LANG=C chroot $mp dpkg -i /tmp/cloud-init.deb ;
            rm $mp/tmp/cloud-init.deb' --

$ qemu-img create -f qcow2 -b disk1.img.dist unpatched.img
$ qemu-img create -f qcow2 -b patched.img.dist patched.img

# boot patched and unpatched images
$ kvm -m 512 -drive file=patched.img,if=virtio -cdrom cfgdisk.img -curses

% grep found.data.source /var/log/cloud-init.log
2013-02-19 21:50:40,887 - __init__.py[DEBUG]: found data source DataSourceConfigDriveNet
2013-02-19 21:50:40,957 - cloud-init[DEBUG]: found data source: DataSourceConfigDrive [net,ver=2][source=/dev/sr0]