[Bug 1748581] [NEW] ubuntu-release-upgrader will need to know how to switch snaps between Ubuntu release channels during an upgrade

[Steve Langasek]

Public bug reported:

As part of the plan for including snaps in Ubuntu images by default
(https://wiki.ubuntu.com/UbuntuSeededSnaps), we intend for the snap
installs to be pinned to (possibly empty) per-Ubuntu-release channels in
the Snap Store.

This means that as part of a dist upgrade, ubuntu-release-upgrader will
need to switch the channels of any relevant installed snaps from the
channel for one release, to the channel for the next release, with snap
refresh.

(In many cases both channels will be empty and this will involve
downloading no new snaps, just changing the pin on the client.)

Since 18.04 is the first release with snaps by default, this doesn't
need to be implemented in 18.04; but will need to be supported by the
release upgrader in 18.10 at latest.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1748581

Title:
  ubuntu-release-upgrader will need to know how to switch snaps between
  Ubuntu release channels during an upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  As part of the plan for including snaps in Ubuntu images by default
  (https://wiki.ubuntu.com/UbuntuSeededSnaps), we intend for the snap
  installs to be pinned to (possibly empty) per-Ubuntu-release channels
  in the Snap Store.

  This means that as part of a dist upgrade, ubuntu-release-upgrader
  will need to switch the channels of any relevant installed snaps from
  the channel for one release, to the channel for the next release, with
  snap refresh.

  (In many cases both channels will be empty and this will involve
  downloading no new snaps, just changing the pin on the client.)

  Since 18.04 is the first release with snaps by default, this doesn't
  need to be implemented in 18.04; but will need to be supported by the
  release upgrader in 18.10 at latest.

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