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[Xen-users] Auto revert domU disk on restart?

Is there a method for reverting a disk back to a known snapshot for a domU whenever it is restarted?
For example, for a kiosk or internet cafe style installation it's convenient to have anything stored on the drive reverted
back to a known state when restarted.

The only thing I can come up with is to create a disk image and then boot off of a VDI differencing image.
When starting, delete and recreate the VDI.

Can this be easily scripted or do I need to modify xen to do it?

Regards, Matthew
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