[Bug 1512361] Re: /etc/writable should be handled by the initrd, not by rootfs builds

[Michael Vogt]

** Changed in: snappy
   Importance: Undecided => Wishlist

** Changed in: snappy
       Status: New => Triaged

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Title:
  /etc/writable should be handled by the initrd, not by rootfs builds

Status in Snappy:
  Triaged
Status in initramfs-tools-ubuntu-core package in Ubuntu:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  currently we set up linking in /etc/writable during image build for files that need atomic writes (on the phone thats only three, on snappy it seems to increase a lot). 
  doing it from livecd-rootfs is hackish and will bind us forever to that image builder (or at least require to move such hacks forward and maintain them in a potentially new build system). instead this should be set up from teh initrd during boot, after the writable mounts are in place, this is a one time thing (should check for existing linkage and just bail out then)

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