Comment 23 for bug 1227520

Adding initramfs-tools-ubuntu-touch tasks. Stephane says that this needs a new mode for /etc/system-image/writable-paths:

stgraber | pitti: so as a summary, I'd agree with the change if you change from "persistent" to "synced" (better names are welcome) and also propose an initramfs-tools-ubuntu-touch change to introduce that new "synced" mode (the code will need to recursively iterate through the source directory and only copy files and directories that don't already exist in the target)

I'm not sure when I'll have time to work on that; I was originally asked to help out with timedated only, not to competely understand and redesign our approach of handling /etc on the phone.. So help with that from someone who already understands the initramfs magic appreciated.