The previous post (#11) is somewhat out of sync. It was supposed to follow this post (which however nobody posted yet).
On IRC we were discussing with nueva the possibility of using OTA updates with the overlay. The issue here is that the OTA update can patch files on root filesystem, files in /var/local, kernel and possibly also uboot. This could result in only part of your system being updated after you remove the overlay. The problem seems to be in whatever scenario you use.
- If you [b]don't[b] disable overlay before the update: it changes both the root file system
and files in /var/local then you will have inconsistency at the moment you remove your overlay (e.g. to use a clean one after something breaks.
- If you disable overlay before the update: you
may not see some of the updated files because you have them modified on the overlay and they are overshadowing the updated files on read-only root.
Right now we seem to have one only option: disable the overlay, apply update, create new clean overlay.
At some later point we can make use of the reconstruction of /var/local ... but I can't remember what was the use. I realy had an idea here that I can't remember right now (I should have written all this sooner).