[Bug 1866159] Re: SRU: Use a snap cohort key for consistent parallel builds in Xenial

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/379689

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https://bugs.launchpad.net/bugs/1866159

Title:
  SRU: Use a snap cohort key for consistent parallel builds in Xenial

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  
  [Impact] 

  We have snap cohort key support in bionic and later since bug
  #1864252.  Adding cohort support in Xenial gives us the ability to
  create images in parallel LP builds with consistent results across all
  suites.

  [Test Case]

  * Build an image which contains snaps with and without a cohort key
  specified and inspect the image to ensure that the expected snaps are
  preseeded.

  * Ensure that the snaps in the image are not attached to the cohort
  key once installed on first boot with 'snap info --verbose $snap_name'

  [Regression Potential]

   * For images built without a cohort key specified we could fail the
  snap download command, and the build, if this were not tested (it has
  been)

  [Other Info]
   
   * none

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