[Bug 1864252] [NEW] preseeded snap installs fail in images

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Robert C Jennings (rcj):

[Impact]

Images built with pre-seeded snaps contain insufficient assertion data
causing boot to fail.

The snaps for seeding are downloaded with a custom snap tool for an
earlier cohort API (now deprecated).  The assertions that it pulls are
incomplete.  We could update that list and move to the new API but at
this time the snap-tool provides no value compared to use of the snap
CLI (cohort support has moved to the cli as well).  The development
overhead of maintaining snap-tool in livecd-rootfs are not warranted.

This patch removes the bespoke snap-tool and relies on the snap CLI
instead.

[Test Case]

 * Produce images that include preseeded snaps (in
/var/lib/snapd/seed/*)

 * Boot the resulting image and ensure that the snapd.seeded unit is
successful and the snaps (from the correct channels) show up in 'snap
list'

[Regression Potential]

 * The interface for these two tools is consistent and the output should
be the same.  There's always a chance that snap-tool had quirks which a
move to the snap CLI uncovers, where the result would be different snaps
seeded from before the change. An example would be channel differences
before and after this change. I haven't seen issues in my testing and I
do think it's unlikely, mostly I'm suspicious of SRUs that don't list
any regression potentials.

[Other Info]

* The attached MP for Xenial is simpler as it never had snap-tool.  The
Xenial MP is a minor change to give us parity between releases for use
of the snap cohort key during download.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
     Assignee: Robert C Jennings (rcj)
         Status: New

-- 
preseeded snap installs fail in images
https://bugs.launchpad.net/bugs/1864252
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