Lots of changes. Seems to work okay now. Still left to do is add
checks to make sure that the OS image that has been specified in the IR file is valid. Need a database check for this. Also, no delta stuff yet; just the main OS partitions that are know to exist on the disk already. Guess we also need to worry about reloading the disk from this script. Sigh, still lots to do, but this will be okay for a little while.
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