[Bug 2115536] Re: [SRU] Allow building WSL images of Focal in the new format

[Julian Andres Klode]

Hello Carlos, or anyone else affected,

Accepted ubuntu-meta into focal-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/ubuntu-meta/1.450.3
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: ubuntu-meta (Ubuntu Focal)
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/2115536

Title:
  [SRU] Allow building WSL images of Focal in the new format

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in ubuntu-meta package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Focal:
  Fix Committed
Status in ubuntu-meta source package in Focal:
  Fix Committed

Bug description:
  [ Impact ]

   * Previously, WSL instances relied on a very lightweight build pipeline which was using the CPC image.
  In 22.04 we did a first step to have WSL has its own project in livecd-rootfs, with its own seed and image to produce a rootfs, while leaving Focal for later.

   * Later, changes to livecd-rootfs and related packages for Noble and
  later were implemented to adapt the images to the new format promoted
  by WSL that allows distributions to no longer rely on MS Store, which
  is becoming deprecated for WSL. Those changes are in the process of
  being backported to Jammy.

   * Focal is the only LTS still supported via Ubuntu Pro that lacks
  those image building capabilities.

   * This Stable Release Update request aims to bring Focal to the
  current state of the art build pipeline of WSL images, allowing us to
  host the final artifacts in Canonical's infrastructure and no longer
  depend on MS Store.

   * We thus need to promote 'ubuntu-wsl' as its own project in 'livecd-
  rootfs' for focal, implement the same image building hooks already
  existing in Jammy and update 'ubuntu-meta' to reflect the changes
  already implemented in the seed related to this project.

  [ Test Plan ]

  1. Build a new Focal image for WSL on Launchpad.
    -> we should see one image ending up with ".wsl" for 20.04 image

  A. New installations:

  1. Ship a cloud-init file to touch a file on disk on `%USERPROFILE%\.cloud-init\Ubuntu-20.04.user-data`
  2. Download the image made available from above, double-click install it on a Windows machine with WSL 2.4.4 and later, then:
  -> Check that basic shell commands works
  -> Check that no MoTD messages complains about cloud-init failure
  -> Check that the file from the cloud-init profile was applied
  -> Run systemctl --failed and ensure nothing is listed related to WSL specific configuration itself
  -> Pro attach the machine and check that it’s attached

  [ Where problems could occur ]

  * Most of the issues could happen on initial boot. It will be really
  easy to spot any issues there with the previous test plan.

  * The set of updated defaults in 20.04 only affect WSL targets, so
  other platforms remain unaffected by the proposed changes.

  [ Other Info ]

   * As already explained in LP #2115426, despite Focal being out of
  standard support, we need to align its build pipeline to the current
  state of the art (implemented for Jammy and later), as MS Store is
  being deprecated.

   * All the changes in the packages tracked by this SRU bug are related
  to each other and need to land together otherwise building a WSl image
  of Focal would fail.

   * This report relates to LP #2080223 and LP #2091293, but the changes
  needed for 20.04 are more complex (as already mentioned in the
  former), thus I'd rather do it in a dedicated SRU.

  * The WSL seed for Focal was already aligned with Jammy and later as
  we can see in [this commit in the ubuntu-seeds
  repository](https://git.launchpad.net/~ubuntu-core-dev/ubuntu-
  seeds/+git/ubuntu/commit/?h=focal&id=70d0bae95ea450b5cb18325d52a56b9e41be9465)

  * Bug https://bugs.launchpad.net/ubuntu/+source/ubuntu-
  meta/+bug/2136341 was opened including 'wsl-pro-service' into Jammy,
  preventing problems for distro upgrades from a new Focal image (built
  after those patches are released).

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