[Bug 1861520] Re: Build the core18 pi generic image

[Łukasz Zemczak]

Since this change only affects ubuntu-image based builds (no other code-
path altered), the regression potential is really low. So all the
classic images built fine, so no regression here. As for the actual
bugfix, I have ran a proposed-enabled bionic core image build on cdimage
- all images besides armhf+raspi3 and arm64+raspi3 built successfully.
Those that failed, failed as expected - checking the build logs, the
right pi model assertion was used. Failure was because of a missing
gadget in the required channel, but that is to be expected (still no
valid gadget there).

** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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https://bugs.launchpad.net/bugs/1861520

Title:
  Build the core18 pi generic image

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Bionic:
  Fix Released

Bug description:
  [Impact]

  Currently for uc18 we build separate images per Pi flavor, e.g. pi3,
  pi2, cm3. Those images are all basically identical, using one gadget
  and one kernel, just different assertions. With 18.04.4 we'll be
  switching to just building two flavors - a pi generic armhf and arm64
  image.

  [Test Case]

  Run a cdimage -proposed beta-channel build of raspi3 arm64 and armhf
  images, make sure images are successfully booted and the right model-
  assertions are used.

  To make sure there are no regressions: build a classic armhf and arm64
  raspi3 image via cdimage with -proposed enabled and make sure that
  builds correctly as well.

  [Regression Potential]

  The only possible regressions might be related to image build
  failures.

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