[Bug 1874834] Re: Xenial builds with core18-based snaps pre-seed core snap instead

[Robert C Jennings]

Built ubuntu-cpc images and tested that images with core or core18 based
snaps build as expected.  The core snap was pulled in for snaps without
an explicit base while core18 & snapd were pulled in for snaps with an
explicit core18 base, and were there were both we have core and core18
without snapd.

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

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Title:
  Xenial builds with core18-based snaps pre-seed core snap instead

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * A xenial image that preseeds a snap based on core18 will
     end up with core instead and preseeding on boot will fail.

  
  [Test Case]

   * Add a binary hook that pre-seeds lxd (which recently moved to a
     core18 base).  Ensure the snapd and core18 are pulled in by the
     build and core is not present.  Boot the image and ensure
     pre-seeding is successful.

  [Regression Potential]

   * Images with pre-seeded snaps regress in some fashion.  We will need
     to check these builds but there are no pre-seeded snaps in the
     livecd-rootfs tree for Xenial so this is a low risk change.

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