Support for snap prepare-image --snap=<snap>=<channel>

[Łukasz Zemczak]

With snapd 2.38, a new syntax to prepare-image will be added with the goal of replacing the --extra-snap option. The new --snap syntax will allow specifying the channel (and an additional mode) to every extra snap individually. We need to make sure ubuntu-image supports the new syntax, possibly dropping the use of the old one. Note to self: remember to bump the snapd version requirement to 2.38 once it's done.

Spec:

https://forum.snapcraft.io/t/evolving-prepare-image-syntax/5988

[Łukasz Zemczak (sil2100)]

Fixed in master.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-image - 1.7+19.10ubuntu1

---------------
ubuntu-image (1.7+19.10ubuntu1) eoan; urgency=medium

  [ Maciej Borzecki ]
  * Some parser improvements: more strict schema for volume names, make sure
    structure names are unique. (LP: #1823160)

  [ Łukasz 'sil2100' Zemczak ]
  * Add support for the new prepare-image --snap=<snap>=<channel|risk> syntax,
    bump the snapd dependency to 2.38. (LP: #1815580)
  * Print a deprecation warning when using the old --extra-snaps syntax.
  * Ignore the new 'grain' field in the pyparted partitiontable structure
    during unit-tests, as otherwise it's causing test failures for disco+.
    (LP: #1826224)

 -- Łukasz 'sil2100' Zemczak <email address hidden> Wed, 24 Apr 2019 16:54:22 +0200