[Bug 1949102] Re: Preinstalled amd64 images cannot upgrade grub.cfg on boot partition + technical dept

[Brian Murray]

Hello Łukasz, or anyone else affected,

Accepted livecd-rootfs into focal-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.664.31 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1949102

Title:
  Preinstalled amd64 images cannot upgrade grub.cfg on boot partition +
  technical dept

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  This is a design flaw that needs to be fixed. Basically we inherited
  the design from old Ubuntu Core devices that the boot configuration is
  prepared in the gadget and - therefore - is quite static. Newer Core
  devices have mechanisms for updating boot assets, while classic
  images... well, we never actually thought about it.

  Now that we have a valid use-case for preinstalled amd64 images, we
  actually need to make sure we can update at least the grub config
  somehow. To do this, we introduce the hook from preinstalled desktop
  images from groovy+ with an additional change to generate the grub.cfg
  by using `update-grub2`. We switch the design to now only shipping a
  blanket grub.cfg on the boot partition, pointing to the rootfs one -
  which can be freely updated via existing mechanisms.

  While adding the hook, we also fix a few other technical dept - like
  adding a swap file and making the rootfs resizable. Everything that we
  already had for our Pi images in groovy+.

  [Test Case]

  Build an image with -proposed enabled, make sure that it still boots
  as before on Intel IOT platforms. Try booting the image on an USB when
  there are other USB drives present on the device.

  [Regression Potential]

  This can basically only regress intel-iotg desktop images, which is
  what we want to fix right now. But it requires for the images to go
  through the whole testing cycle again, to make sure that everything
  still works - since we're basically switching to a completely new
  grub.cfg. The test case should be sufficient to make sure there are no
  regressions.

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