Comment 27 for bug 1568889

It would be preferable to do an up front check and inform settings so they can pop up a warning.
We could make an assumption on the installed size based on the compressed size, perhaps choose a worst case % so we would verify that a factor larger is available. I can try to come up with a heuristic. (or maybe we can add an API to the server to tell us?)

As this so far only happens on devices where the user explicitly enabled r/w and installed packages I will drop the priority a bit.