[Bug 1922297] Re: 20.10 to 21.04: snap does not upgrade channel

[Brian Murray]

Actually this didn't turn out the way we want (when upgrading from X to
B) as gnome-3-34-1804 and gtk-common-themes are not tracking
latest/stable/ubuntu-18.04 but just latest/stable because they were
installed as dependencies of another snap. This is only an issue during
the upgrade from X to B as the snaps will have already been installed on
an Ubuntu 18.04 system. Simply changing the quirk to use an ordered
dictionary will ensure that the two dependent snaps are installed first
and tracking the right channel.

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https://bugs.launchpad.net/bugs/1922297

Title:
  20.10 to 21.04: snap does not upgrade channel

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Committed
Status in ubuntu-release-upgrader source package in Focal:
  Fix Committed
Status in ubuntu-release-upgrader source package in Groovy:
  Fix Committed
Status in ubuntu-release-upgrader source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

  Snaps tracking a stable/ubuntu-$version (other than gnome-3-34-1804
  and gtk-common-themes) are not upgraded during the release upgrade
  process.

  Per LP: #1827951 and LP: #1748581, it would appear that if a snap is
  tracking a release channel (e.g. latest/stable/ubuntu-20.10), during a
  do-release-upgrade the snap channel should update to the new release.
  Testing of a Google cloud image, from 20.10 to 21.04 the google-cloud-
  sdk does not get updated.

  # Expected result

  After a do-release-upgrade, the snap channel for google-cloud-sdk
  should be updated from "latest/stable/ubuntu-20.10" to
  "latest/stable/ubuntu-21.04".

  # Actual result

  After install, the snap continues to track
  "latest/stable/ubuntu-20.10".

  [Test Plan]
  GCE image test
  --------------
  1. Boot 20.04 GCE image
  2. snap info google-cloud-sdk --> "latest/stable/ubuntu-20.04"
  3. do-release-upgrade
  4. accept defaults and reboot
  5. snap info google-cloud-sdk --> "latest/stable/ubuntu-20.10"

  With the version from -proposed the snap will be tracking
  "latest/stable/ubuntu-20.10"

  Ubuntu (18.04, 20.04) Desktop test (regression test)
  ----------------------------------------------------
  1. Create an Ubuntu 20.04 installation (w/ ubuntu-desktop)
  2. Run 'do-release-upgrade -p' to upgrade to Groovy
  3. Ensure that the gtk-common-themes (and gnome-3-34-1804) snap is now tracking "latest/stable/ubuntu-20.10" via snap-info

  With the version from -proposed all installed snaps which track
  "latest/stable/ubuntu-20.04" will also be upgraded to
  "latest/stable/ubuntu-20.10".

  Ubuntu (16.04) Desktop test plan (new feature)
  ----------------------------------------------
  1. Create an Ubuntu 16.04 installation w/ ubuntu-desktop
  2. Run 'do-release-upgrade' to upgrade to Ubuntu 18.04
  3. Run snap list and verify that no snaps are installed

  With the version of the release upgrader in -proposed you will have a
  set of snaps installed which are equivalent to the snaps that are
  preseeded in Ubuntu 18.04. That list of snaps is:

  gnome-3-34-1804, gnome-calculator, gnome-characters, gnome-logs,
  gnome-system-monitor, and gtk-common-themes.

  [Where Problems could occur]
  This could regress the upgrading of snaps for Ubuntu desktop images but we've identified that and created a regression test for that scenario.

  # Logs

  main.log https://paste.ubuntu.com/p/kbSvM5JMzP/
  screenlog.0 https://paste.ubuntu.com/p/h5kvtcX5Z6/
  apt-term.log https://paste.ubuntu.com/p/gNJVzbtT4Z/

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