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Some kind of overlayfs type solution? With a non-writeable "default" lower state and a writeable upper state where the changes occur, removing the upper state would effectively reset the system.

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Fair call, sounds like an immutable OS like CoreOS where updating it requires a reboot. That's possibly all that's required!

IMHO something was lost when hard drives no longer had their own write-protect switch (remembering back to DEC rack-mount spinning drives).

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