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

[Joshua Powers]

# update /etc/update-manager/release-upgrades to Prompt=normal
$ sudo snap info google-cloud-sdk
name:      google-cloud-sdk
summary:   Google Cloud SDK
publisher: Cloud SDK (google-cloud-sdk✓)
store-url: https://snapcraft.io/google-cloud-sdk
license:   unset
description: |
  Command-line interface for Google Cloud Platform products and services
commands:
  - google-cloud-sdk.anthoscli
  - google-cloud-sdk.bq
  - google-cloud-sdk.docker-credential-gcloud
  - google-cloud-sdk.gcloud
  - google-cloud-sdk.gsutil
  - google-cloud-sdk.kubectl
snap-id:      MJbt3BgxESyOON7gqKVEnA06NLRM3Dxd
tracking:     latest/stable/ubuntu-20.04
refresh-date: 4 days ago, at 04:14 UTC
channels:
  latest/stable:    337.0.0 2021-04-20 (178) 237MB classic
  latest/candidate: ↑                              
  latest/beta:      337.0.0 2021-04-20 (178) 237MB classic
  latest/edge:      337.0.0 2021-04-20 (178) 237MB classic
installed:          336.0.0            (177) 236MB classic
$ do-release-upgrade -p
$ sudo snap info google-cloud-sdk
name:      google-cloud-sdk
summary:   Command-line interface for Google Cloud Platform products and services
publisher: Cloud SDK (google-cloud-sdk✓)
store-url: https://snapcraft.io/google-cloud-sdk
contact:   https://cloud.google.com/sdk/docs/
license:   unset
description: |
  Command-line interface for Google Cloud Platform products and services
commands:
  - google-cloud-sdk.anthoscli
  - google-cloud-sdk.bq
  - google-cloud-sdk.docker-credential-gcloud
  - google-cloud-sdk.gcloud
  - google-cloud-sdk.gsutil
  - google-cloud-sdk.kubectl
snap-id:      MJbt3BgxESyOON7gqKVEnA06NLRM3Dxd
tracking:     latest/stable/ubuntu-20.10
refresh-date: today at 17:57 UTC
channels:
  latest/stable:    337.0.0 2021-04-20 (178) 237MB classic
  latest/candidate: ↑                              
  latest/beta:      337.0.0 2021-04-20 (178) 237MB classic
  latest/edge:      337.0.0 2021-04-20 (178) 237MB classic
installed:          337.0.0            (178) 237MB classic
$ grep "release-upgrader version" /var/log/dist-upgrade/main.log
2021-04-20 17:47:06,645 INFO release-upgrader version '20.10.15' 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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