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[Xen-users] Auto revertable disk

How do I create a Virtual Machine disk that when started the user can do whatever they like however,
when the domain ends (for any reason) the state of the disk is automatically reverted to it's original state.

I think this could be as easy as creating a copy on write VHD of the disk I want to use as the "clean state".
Then before starting the domain, delete the VHD and re-create it, then create the domain.

It's trivial to script this, but if the user was to "restart" then I want it reverted to.  So how do I detect a reboot etc?
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