[Bug 1910557] [NEW] Buildd images do not launch on macOS under multipass due to missing unpacked kernels and initrd

[David Krauser]

Public bug reported:

livecd-rootfs v2.700 in hirsute introduced a fix to produce unpacked
artifacts for use by multipass on macOS hosts. These hosts require
direct access to a kernel and initrd to boot the buildd images.

See: https://git.launchpad.net/livecd-
rootfs/commit/?id=065c82314464fa78337d5122e1d4826a7d6edbb0

This change needs to be backported to all suites.

[Impact]

 * Without this change, users are unable to use the buildd images with
multipass on macOS hosts. Snapcraft utilizes multipass to build snaps,
so this blocks macOS users from building snaps.

As a workaround, the CPC team is manually extracting these artifacts and
publishing them to cloud-images.ubuntu.com. This is not ideal for the
long-term, and could result in breakage in the event that the CPC team
forgets to manually publish these artifacts.

[Test Case]

 * After this change lands, a user should be able to build images with
the ubuntu-base project and buildd subproject, and the resulting build
should produce extracted kernel and initrd artifacts.

[Where problems could occur]

 * These changes are minor, but a mistake could result in broken buildd image hooks (where the build fails) or broken buildd image artifacts (where the images don't work as expected).
* Since all buildd images are manually tested by the launchpad team, multipass team, and snapcraft team before they enter production, the risk of introducing breakage for end users is low.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1910557

Title:
  Buildd images do not launch on macOS under multipass due to missing
  unpacked kernels and initrd

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  livecd-rootfs v2.700 in hirsute introduced a fix to produce unpacked
  artifacts for use by multipass on macOS hosts. These hosts require
  direct access to a kernel and initrd to boot the buildd images.

  See: https://git.launchpad.net/livecd-
  rootfs/commit/?id=065c82314464fa78337d5122e1d4826a7d6edbb0

  This change needs to be backported to all suites.

  [Impact]

   * Without this change, users are unable to use the buildd images with
  multipass on macOS hosts. Snapcraft utilizes multipass to build snaps,
  so this blocks macOS users from building snaps.

  As a workaround, the CPC team is manually extracting these artifacts
  and publishing them to cloud-images.ubuntu.com. This is not ideal for
  the long-term, and could result in breakage in the event that the CPC
  team forgets to manually publish these artifacts.

  [Test Case]

   * After this change lands, a user should be able to build images with
  the ubuntu-base project and buildd subproject, and the resulting build
  should produce extracted kernel and initrd artifacts.

  [Where problems could occur]

   * These changes are minor, but a mistake could result in broken buildd image hooks (where the build fails) or broken buildd image artifacts (where the images don't work as expected).
  * Since all buildd images are manually tested by the launchpad team, multipass team, and snapcraft team before they enter production, the risk of introducing breakage for end users is low.

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