[Dev] [RFC] Tizen system rollback

Stoppa, Igor igor.stoppa at intel.com
Mon Dec 2 10:11:36 GMT 2013

one more doubt

On 2 December 2013 12:04, Stoppa, Igor <igor.stoppa at intel.com> wrote:

> ​Hi,​
> On 2 December 2013 11:45, Łukasz Stelmach <l.stelmach at samsung.com> wrote:
>> Please consider upgrading tens (hundreds) of thousands units. If you
>> break them OTA you have to fix them OTA. You won't make N (where N ~
>> 1E5, you may be lucky enough to make 10% of you customers download
>> flashing software for PC that still gives 90k) customers visit repair
>> shops. You don't have that many repair shops to fix such failure (in
>> reasonable time).
> ​I agree that, presented from this perspective there is a point to it.
> Questions: how likely is it?
> Of course even if it's unlikely one doesn't want to be the responsible for
> the failure.
> AFAIK nobody has yet managed to cause such massive failure on the field.
> But let's assume that, since it's better to be safe than sorry, some
> mechanism has to be deployed,
> I'm still not sure that btrfs is the right answer. Not for btrfs per se,
> but rather because the rollback
> would happen at a very low level which has no knowledge of what is really
> going on. ​
> There should be also some mechanism to re-align with the user data stored
> in the cloud,
> which ​might have diverged significantly, in case the rollback happens
> significantly later on, after the upgrade.
What happens to apps that have been upgraded and are not compatible​ with
the older
OS revision?

The new app might even have changed the config format.​

cheers, igor
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