New in libguestfs 1.13.19 is a tool called virt-sysprep which makes it easier to clone virtual machines.
The new tool isn’t a complete clone tool, but you can easily combine it with other tools like dd, the old virt-clone, virt-resize and virt-sparsify to clone virtual machines.
Richard WM Jones 
1. You should clarify it is for Linux VMs. The name is misleading.
2. Wouldn’t it make more sense to use the OS built-in mechanism to re-init itself? For example, in Fedora it’ll be removing /etc/sysconfig/firstboot .
1. We are intending that it’ll work for Windows VMs. In fact, Chris wrote some code to install and run sysprep already (see here).
2. Or in Fedora:
touch /.unconfiguredwhich is supposed to do that.The libguestfs git repository is down, please fix it:
http://git.annexia.org/?p=libguestfs.git;a=summary
git://git.annexia.org/git/libguestfs.git
It’s working now. In any case there is a mirror here:
http://fedorapeople.org/gitweb?p=rjones/public_git/libguestfs.git;a=summary
It’s not clear to me in the description if virt-sysprep rewrites /etc/fstab but if not you may want to add that (some distros like Ubuntu use disk UUID via blkid).
Thanks — noted in the TODO list.