Code review comment for lp:~mvo/snappy/snappy-lp1460152-workaround

Wouldn't this only be triggered after doing a second update? The major problem we have is that we're currently over a stable/older image, and we want to update to edge, and make sure that the new cache is not broken on the next reboot, but we're still updating to edge using the tools available at stable (not using the extra logic you added here).

So the workaround would need to be either something triggered by the update process coming from stable, or something done as part of the first boot after updating the image.