Automatic multi-environment collection handling

[Menno Smits]

On 19 December 2014 at 06:02, Dimiter Naydenov <
dimiter.naydenov at canonical.com> wrote:
>
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> All this is great work! Thanks for the write-up as well.
>
> I think I discovered an issue with it - take a look at this bug
> http://pad.lv/1403738. It seems machine.SetAgentVersion() should be
> handled specially by the multi-env transaction runner, as only after
> calling it the upgrade actually starts and the steps to add env-uuids
> to state collections are executed.


Sorry - I neglected to do a manual upgrade test before pushing this change.
Ensuring that code that runs before database migrations have occurred still
works as it should has been pain point for us while doing the
multi-environment work.

I will get this sorted. Thanks for saving me some time by doing the initial
analysis.

- Menno
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