[Bug 1273288] Re: On installes where no OTA upgrade is possible, system-image should not attempt an upgrade

[Barry Warsaw]

I'm not completely convinced that r/w images should be completely
prevented from doing image based updates.  For example, I switch over to
r/w for testing, but I still want to update via s-i.  Perhaps we can
look for /userdata/.writable_image and refuse to update *unless* there
was some other magical file present, e.g. /userdata/.allow_image_updates

When doing cdimage installs, does /userdata/.writable_image exist?  If
not, what the best way to differentiate between the two installs?

** Tags added: client

** Also affects: ubuntu-system-image
   Importance: Undecided
       Status: New

** Changed in: ubuntu-system-image
       Status: New => Triaged

** Changed in: ubuntu-system-image
   Importance: Undecided => Wishlist

** Changed in: system-image (Ubuntu)
       Status: New => Triaged

** Changed in: system-image (Ubuntu)
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1273288

Title:
  On installes where no OTA upgrade is possible, system-image should not
  attempt an upgrade

Status in Ubuntu system image (server/client/updater):
  Triaged
Status in “system-image” package in Ubuntu:
  Triaged
Status in “ubuntu-system-settings” package in Ubuntu:
  Triaged

Bug description:
  On readwrite images or installs done using the cdimage zips OTA upgrades are obviously not possible.
  nontheless going to System-Settings -> Updates, starts the updater which will spin endlessly ... or even worse actually updates the rw loop mounted image, the app should have some check if an image is rw and simply refuse to update (probably telling the user in a friendly manner about this)

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