[Bug 1887673] Re: Add support for building Ubuntu appliance images

[Łukasz Zemczak]

This is verified. I was able to produce the full set of appliance images
using the -proposed version of livecd-rootfs (2.525.44):

http://cdimage.ubuntu.com/ubuntu-appliance/18/stable/20200722.4/

Also, regular ubuntu-core images are still building correctly as daily
images are still being produced normally. No errors.

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

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Title:
  Add support for building Ubuntu appliance images

Status in livecd-rootfs package in Ubuntu:
  Confirmed
Status in livecd-rootfs source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  A while back, we have launched Ubuntu Appliances, a set of ubuntu-core
  based appliance-based images for various use-cases. One can read more
  about those here:

  https://ubuntu.com/appliance

  The first batch of appliances have been created with some local
  tooling. This is counter-productive, as there will be more and more
  appliances appearing in time. We want to support building and
  publishing of such images via cdimage. For this, we need to add
  support for building such images into livecd-rootfs.

  To make the task of adding new appliances easier, we want to add
  support for building arbitrarily named appliance images. The proposed
  change adds a special appliance-<MODEL> wildcard SUBARCH, which
  results in building an image of the specified model - additionally
  setting the brand to ubuntu from the default canonical one.

  [Test Case]

  Once the package builds in -proposed, attempt a livefs ubuntu-core
  build with SUBARCH=appliance-adguard-home-core18-amd64, make sure it
  succeeds. Then launch another livefs ubuntu-core build with SUBARCH
  =appliance-adguard-home-core18-pi, make sure it succeeds.

  To make sure regular core builds are still working, check if -proposed
  based bionic ubuntu-core and classic raspi images still build
  correctly.

  [Regression Potential]

  We need to make sure that regular ubuntu-core and preinstalled server
  builds still work correctly, as this is where any regressions can be
  seen. But we added a test case for that.

  [Other Info]

  Note to SRU members: this is a change very specific to bionic. I will
  also push it to groovy later, but it basically only has an use-case in
  bionic (uc18). When we switch appliances to uc20, we'll need to push
  this to focal - but right now it makes no sense to have it there (and
  no way to test it).

  So I'd appreciate only accepting it for bionic.

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