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

[Brian Murray]

The verification passed for an upgrade from Xenial to Bionic with the
dist-upgrader in -proposed on an Ubuntu desktop system.

bdmurray at clean-xenial-amd64:/tmp/ubuntu-release-upgrader-4s1rl91t$ snap list
Name                  Version                Rev    Tracking         Publisher   Notes
core18                20210309               1997   latest/stable    canonical✓  base
gnome-3-34-1804       0+git.3556cb3          66     latest/stable    canonical✓  -
gnome-calculator      3.38.2+git3.1d166209   884    latest/stable/…  canonical✓  -
gnome-characters      v3.34.0+git30.16311a5  708    latest/stable/…  canonical✓  -
gnome-logs            3.36.0                 103    latest/stable/…  canonical✓  -
gnome-system-monitor  3.38.0-17-g38c1ce1d62  157    latest/stable/…  canonical✓  -
gtk-common-themes     0.1-50-gf7627e4        1514   latest/stable    canonical✓  -
snapd                 2.49.2                 11588  latest/stable    canonical✓  snapd
bdmurray at clean-xenial-amd64:/tmp/ubuntu-release-upgrader-4s1rl91t$ snap info gnome-logs
name:      gnome-logs
summary:   A log viewer for the systemd journal
publisher: Canonical✓
store-url: https://snapcraft.io/gnome-logs
contact:   https://bugs.launchpad.net/ubuntu/+source/gnome-logs/+bugs?field.tag=snap
license:   unset
description: |
  Logs makes it easy to view and filter log messages and events.
  Filter logs by category and importance to get the information you want. Use
  the integrated search to get more relevant results.
commands:
  - gnome-logs
snap-id:      kIMfmZTJspWa8vtfbgU3W9Nbv4V5Qgmh
tracking:     latest/stable/ubuntu-18.04
refresh-date: today at 11:35 PDT
channels:
  latest/stable:    3.36.0 2021-03-15 (103) 561kB -
  latest/candidate: ↑
  latest/beta:      ↑
  latest/edge:      ↑
installed:          3.36.0            (103) 561kB -
bdmurray at clean-xenial-amd64:/tmp/ubuntu-release-upgrader-4s1rl91t$ grep "release-upgrader version" /var/log/dist-upgrade/main.log
2021-04-20 09:19:16,290 INFO release-upgrader version '18.04.40' started

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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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