We are using GO-CD to build and test our product under Windows. The product 
is a desktop application.

We have a pipeline that builds the product and we use virtual machines 
(under HyperV) to test it in controlled environments. Each VM hosts a GOCD 
agent to carry out the installation and testing of our product.

The system needs to reset the VMs by applying a snapshot before actual 
deployment and testing can occur. 
It is easy to restore the VMs using powershell.

The big-picture pipelines are:
- Build
- Hardware-Tests (on a real machine with hardware attached): Copy files, 
Test Application
- Software-Tests (on a VM): Restore VM, install Application, test
- Customer-Specific tests (on a VM): Restore VM, install Application, test

This set of pipelines is replicated for each maintenance branch of the 
product (trunk, v1.0.*, v1.1.*... v2.0.*)

Ideally I would like to be able to have any number of VMs available for 
software and customer tests to allow concurrent builds of different 
versions of the product.
My problem is in modelling this in GOCD since I do no want two pipelines to 
restore the same VM. GOCD can choose a VM agent to cary out the testing, 
but the agent cannot restore its own VM (since it will then disappear and 
be reset, leading to a pipeline failure).

Any idea on how to deal with such an environment ? Or am I doing this wrong 
? Has anyone implemented something like this before ?

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