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Storage state dumping



Here are some patches that dump storage state at the beginning and end
of installation. Device and DeviceFormat classes define a "dict"
attribute containing all of the important data describing that
instance of the class. The dicts are then pickled using the shelve
module into a file called "storage.state". The dicts can be retrieved
from this file using the shelve module and, eventually, used to create
Device and DeviceFormat instances to recreate installation scenarios.


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