[Bug 1891505] Re: LXD appliance image needs to follow the 4.0 track

[Łukasz Zemczak]

Ran a PROPOSED=1 ubuntu-appliance image of the lxd appliance and
confirmed via the manifest that the correct lxd version has been used.
The build can be seen here:

https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/bionic/ubuntu-
core/+build/234364

livecd-rootfs version used was 2.525.47.

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

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Title:
  LXD appliance image needs to follow the 4.0 track

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  Per definition of the appliance, we need to follow the 4.0 LTS track instead of 'latest', which is default. I originally assumed that the model assertion will be self-contained and has everything that's needed, but it seems that required-snaps for UC18 are not allowed to have custom tracks set (this is only supported for UC20).
  So to make things work, we need to work-around it by adding the custom lxd snap track via livecd-rootfs.

  [Test Case]

  Perform a -proposed enabled ubuntu-appliance cdimage build for the lxd
  appliance and confirm via the manifest that the lxd snap is taken from
  the right track.

  [Regression Potential]

  If anything, all possible regressions are in ubuntu-core image builds,
  like invalid extra snaps could be installed or the builds could start
  failing.

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