Optional daemon

[Didier Roche]

Le 27/10/2016 à 19:00, Aaron Ogle a écrit :
> On Thu, Oct 27, 2016 at 11:56 AM Kyle Fazzari
> <kyle.fazzari at canonical.com <mailto:kyle.fazzari at canonical.com>> wrote:
>
>
>     So are you storing this database in $SNAP_COMMON? Because
>     $SNAP_DATA would do this for you, no?
>
>
> Correct we are doing in $SNAP_COMMON.  Is $SNAP_DATA using CoW?  Or is
> it going to be a full copy.  From what I could see it was a full
> copy.  This would quickly add up.  Not to mention you loose all of our
> messages sent when you roll back.


I would suggest to use $SNAP_DATA. Once we have garbage collection
enabled on snapd, you will have approx. 2 copies at most of your data
(the old version and the current one). I guess this is a reasonable
tradeoff to ensure you can always revert safely.

Imagine the case if a new version corrupts your data. You will not have
any way to retrieve them back if you store in $SNAP_COMMON, whichever
downgrade scripts you are writing…

So, I would argue to try $SNAP_DATA first, and then only revisit to move
to $SNAP_COMMON if you see that doesn't suit you.
Making sense?
Didier

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