[Bug 1889470] Re: snap seed with channel breaks ubuntu-cpc:minimized builds on focal

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/388321

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https://bugs.launchpad.net/bugs/1889470

Title:
  snap seed with channel breaks ubuntu-cpc:minimized builds on focal

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * Focal ubuntu-cpc:minimized builds fail (see Original Description)

  [Test Case]

   * detailed instructions how to reproduce the bug

   * these should allow someone who is not familiar with the affected
     package to reproduce the bug and verify that the updated package fixes
     the problem.

  [Regression Potential]

   * discussion of how regressions are most likely to manifest as a
  result of this change.

   * It is assumed that any SRU candidate patch is well-tested before
     upload and has a low overall risk of regression, but it's important
     to make the effort to think about what ''could'' happen in the
     event of a regression.

   * This both shows the SRU team that the risks have been considered,
     and provides guidance to testers in regression-testing the SRU.

  [Other Info]
   
   * Anything else you think is useful to include
   * Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
   * and address these questions in advance

  [Original Description]

  The seed now specifies the lxd snap in focal as
  'lxd=4.0/stable/ubuntu-20.04' which doesn't match the expectations of
  the code with looks for lxd as the only snap in the seed for minimized
  images.  This patch updates the pattern to accept 'lxd' or 'lxd=*'.

  The failure we see in the build is:

  W: No seed matching task cloud-image
  snap: considering required
  snap: considering minimal
  snap: considering standard
  snap: considering server
  snap: found lxd=4.0/stable/ubuntu-20.04
  Unexpected seeded snap for ubuntu-cpc:minimized build: lxd=4.0/stable/ubuntu-20.04
  Build failed

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