[Bug 2036725] Re: LXD snap not being installed from the right channel when running unminimize

[Utkarsh Gupta]

Hey there!

I've tested the update from -proposed pockets of all the releases.
Sadly, the LTS release uses a different channel and thus we'll have to
re-do that bit but the non-LTS releases are fine.

The unminimize script works as intended on Lunar, marking that as
verification-done, however I'll propose a new fix for all the releases
now.

** Tags removed: block-proposed-jammy verification-needed-lunar
** Tags added: verification-done-lunar

** Changed in: livecd-rootfs (Ubuntu)
       Status: Fix Released => New

** Changed in: livecd-rootfs (Ubuntu Jammy)
       Status: Fix Committed => New

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https://bugs.launchpad.net/bugs/2036725

Title:
  LXD snap not being installed from the right channel when running
  unminimize

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Jammy:
  New
Status in livecd-rootfs source package in Lunar:
  Fix Released

Bug description:
  [Impact]
  ========

  There's a step in `unminimize` where it installs the LXD snap. The
  problem is that it doesn't mention any channel where to install it
  from. So often it happens that we have the LXD snap on 20.04 or 22.04
  from the latest/stable channel (as that's the default!).

  However, we should be installing this from stable/ubuntu-20.04 or
  stable/ubuntu-22.04 (or equivalent) channel.

  [Test Plan]
  ===========

  $ lxc launch ubuntu-minimal-daily:jammy jtemp --vm
  $ lxc shell jtemp
  # apt update
  # unminimize
  # snap list | grep 'lxd' | awk '{print $4}'

  You'll see that it's NOT from stable/ubuntu-$VERSION, whereas it
  should be. ;)

  [Where Problems Could Occur]
  =============================

  There's very smol room for error especially when the patch only
  introduces the following to the snap install call:
  --channel="stable/ubuntu-$VERSION_ID"

  But things might behave differently IFF someone has tampered their
  /etc/os-release OR/AND fiddled with the unminimize script to do a
  different thing. :)

  [OG Bug Report]
  ===============

  In the past, when running unminimize, we'd directly do:
  snap install lxd
  (cf: https://git.launchpad.net/livecd-rootfs/tree/live-build/auto/build#n322)

  which defaults to the latest/stable channel. However, whilst working
  on enhancing unminimize, it was observed that we install this snap
  from the stable/ubuntu-<version> channel instead.

  This was also noted as a failure when running the CTF tests:
  `lxd installed from latest/stable, not stable/ubuntu-23.10`

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