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

[Łukasz Zemczak]

Public bug reported:

[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.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Critical
     Assignee: Łukasz Zemczak (sil2100)
         Status: Invalid

** Affects: livecd-rootfs (Ubuntu Bionic)
     Importance: Critical
     Assignee: Łukasz Zemczak (sil2100)
         Status: In Progress

** Also affects: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu Bionic)
   Importance: Undecided => Critical

** Changed in: livecd-rootfs (Ubuntu Bionic)
     Assignee: (unassigned) => Łukasz Zemczak (sil2100)

** Changed in: livecd-rootfs (Ubuntu)
       Status: In Progress => Won't Fix

** Changed in: livecd-rootfs (Ubuntu)
       Status: Won't Fix => Invalid

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https://bugs.launchpad.net/bugs/1891505

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:
  In Progress

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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