Install VM with virt-builder

Hello,

I open this issue because I wish to implement a way to install VMs with virt-builder (from libguestfs project).

I wish to list here everything we need to think about and the useful information.

• virt-builder can set up some basic settings on the VM OS, like the hostname and the root password. It can also copy a file to the desired location on the VM volume.
• virt-builder downloads (from a libguestfs-maintained repository or a custom one) a template of a given OS (containing partitions) and deploy it on a file (raw or qcow) or on a block device, with ability to automatically expand the partitions to fit the given device.
• Sadly, virt-builder can't yet use qemu storage backends to access target storage, so you have to map it to a block device in order to deploy on it using virt-builder. For instance, for RBD, you have to map it using RADOS kernel module or RBD-NBD implementation.

Do you think this is a good idea?

Start by clarifying the proposed virt-builder integration and its scope within this Ansible role. Review the role's existing VM creation flow and determine how libguestfs, storage targets, OS templates, and partition expansion should be handled; the issue does not yet define acceptance criteria or a test path.