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

[David Krauser]

Autopkgtests for v2.664.5 have passed (which build ubuntu-
cpc:minimized).

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

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

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

Bug description:
  [Impact]

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

  [Test Case]

   * build ubuntu-cpc:minimized
     * autopkgtest will catch this now, but didn't previously because the seed had yet to change

  [Regression Potential]

   * This is a very low risk change that is only in the code path
  ubuntu-cpc:minimized and the regression would require us to add a
  seeded snap that had a lxd=something that wasn't lxd, however the snap
  store doesn't allow '=' in name, so I think we're good.

  [Other Info]

   * None

  [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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