Another snappy newbie question:
One of the obvious selling points of snappy is the ability to rollback
to previous versions and the a/b partition scheme to safeguard core
system updates.
My question is: do these built-in safety mechanism cover power losses at
any time during the upgrade process? For the core as well as for
frameworks and apps? This is important for embedded devices, in
particular those in remote locations or in vehicle installations where
the driver may just shut off the car or truck at the worst possible time.
Ideally the system would automatically revert to the previous known
working core/framework/app revision in case of an update failure.
I read the description at
https://developer.ubuntu.com/en/snappy/guides/system-updates/
and it sounds like this feature is already there for the core. But how
about frameworks and apps? I assume the system simply wouldn't switch
over to the newer version if the upgrade process is not completed, is
that correct? Is there any point in time where a power loss would still
be fatal?
Thanks,
Wolfgang
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