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

[Oliver Grawert]

Public bug reported:

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)

** Affects: snappy
     Importance: Undecided
         Status: New

** Affects: initramfs-tools-ubuntu-core (Ubuntu)
     Importance: Medium
     Assignee: Oliver Grawert (ogra)
         Status: Confirmed

** Affects: livecd-rootfs (Ubuntu)
     Importance: Medium
     Assignee: Oliver Grawert (ogra)
         Status: Confirmed

** Also affects: initramfs-tools-ubuntu-core (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: initramfs-tools-ubuntu-core (Ubuntu)
     Assignee: (unassigned) => Oliver Grawert (ogra)

** Changed in: livecd-rootfs (Ubuntu)
     Assignee: (unassigned) => Oliver Grawert (ogra)

** Changed in: initramfs-tools-ubuntu-core (Ubuntu)
   Importance: Undecided => Medium

** Changed in: livecd-rootfs (Ubuntu)
   Importance: Undecided => Medium

** Changed in: initramfs-tools-ubuntu-core (Ubuntu)
       Status: New => Confirmed

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1512361

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

Status in Snappy:
  New
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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