Sysprep did not seem to work

[dbroeglin]

I was trying to use boxcutter/windows to generate a windows 2012 vagrant base box. Everything worked fine and I had a working base box in no time. Nice work!

However, when I tried to use it as a base for a lab with a DC I ran into the issue that all machines had the same SID. I was able to make things work in the end but as I'm not, by far, an expert in this I though I would rather give you a report of what I did rather than a PR.

I found the GENERALIZE variable but was not able to use it as is:

GENERALIZE=true make virtualbox/eval-win2012r2-standard-ssh

It looks like sysprep could not be found, after some fiddling it looks like the executable path had to be in lowercase. Also, sysprep could not find A:/Autounattend.xml (it probably was not mounted anymore at that stage) so I moved the file to C:/Windows/Temp/Autounattend_sysprep.xml

Then, the file would not apply everything required to have a directly usable box in Vagrant. By merging some stuff from https://github.com/mwrock/packer-templates and other posts like box-cutter/windows-vm#5 I finally have an unattend file that works and generates a working windows box in vagrant. Nothing is asked at startup and all VMs are specialised as needed.

The changes I made are here dbroeglin@ef4464e

I would gladly create some pull request but I would need some guidance as to how this should be integrated in the boxcutter/windows repo as I focused solely on win2012r2.