Identify which OS is installed in a VM via Casper

I put together an extension attribute that looks for VM on a mac and reports the OS installed in the VM.
It gives great visibility into clients should you need to address unmanaged VMs circulating on your network.
I hope others can find it useful in their environment.
As always, feedbacks are always welcome.
Cheers
https://jumpt.wordpress.com/2015/05/02/identifying-installed-vm-guestos-via-casper/