[Bug 2077344] Re: upgrades should change snap-store and firmware-updater tracking

[Tim Andersson]

I've tried reproducing this.
Fresh jammy install:
```
ubuntu at ubuntu:~$ snap info snap-store | grep "^tracking:"
tracking:     latest/stable/ubuntu-22.04
ubuntu at ubuntu:~$ snap info firmware-updater | grep "^tracking:"
ubuntu at ubuntu:~/ubuntu-release-upgrader$ ./do-release-upgrade --proposed
[snip]
Processing snap replacements

refreshing snap core22

installing snap firmware-updater

refreshing snap gnome-42-2204

refreshing snap gtk-common-themes

refreshing snap snap-store

refreshing snap snapd-desktop-integration

refreshing snap firefox
[snip]
ubuntu at ubuntu:~/ubuntu-release-upgrader$  snap info firmware-updater | grep "^tracking:"
tracking:     1/stable/ubuntu-24.04
ubuntu at ubuntu:~/ubuntu-release-upgrader$  snap info snap-store | grep "^tracking:"
tracking:     2/stable/ubuntu-24.04
```

All looks to be well

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https://bugs.launchpad.net/bugs/2077344

Title:
  upgrades should change snap-store and firmware-updater tracking

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Noble:
  Fix Committed

Bug description:
  [Impact]

  We would like 24.04 LTS systems and newer to have snap-store track
  2/stable, and firmware-updater track 1/stable.

  ubuntu-release-upgrader has a "deb2snap" mechanism capable of doing
  this.

  [Test Plan]

  1. On Jammy, see that snap-store and firmware-updater are not tracking
  2/stable and 1/stable, respectively:

  $ snap info snap-store | grep "^tracking:"
  $ snap info firmware-updater | grep "^tracking:"

  Perform an upgrade from Jammy to Noble:

  $ do-release-upgrade -d

  After the upgrade, confirm that snap-store and firmware-updater are
  tracking the new channels:

  $ snap info snap-store | grep "^tracking:"
  $ snap info firmware-updater | grep "^tracking:"

  In this case, since the snap tracking was not previously modified, no
  informational message should be displayed to the user.

  2. Do the same test as before, but before the upgrade, switch snap-
  store to something like beta/stable so that a notification is
  displayed about switching the snap tracking.

  [Where problems could occur]

  The patch is editing deb2snap.json entries. Typos would lead to a
  failure in changing the trackings. We should also be certain that
  these are the correct trackings for these snaps.

  There is also some new logic added to allow "force switching" a snap's
  tracking channel. This logic should only be in effect when a deb2snap
  entry explicitly asks for it. Nonetheless, issues in the
  implementation would effect the deb2snap logic during the upgrade.

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