[Bug 1873373] Re: livecd-rootfs must stop using manual seeds, and always use `snap prepare-image --classic`

[Dimitri John Ledkov]

Related https://forum.snapcraft.io/t/seeding-snaps-that-plug-the-
content-interface/5579/14

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https://bugs.launchpad.net/bugs/1873373

Title:
  livecd-rootfs must stop using manual seeds, and always use `snap
  prepare-image --classic`

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  $ snap prepare-image --classic
  /var/lib/snapd/assertions/asserts-v0/model/16/generic/generic-
  classic/active `pwd` --snap core18=latest/stable --snap
  subiquity=latest/stable/ubuntu-20.04 --arch s390x

  
  is really cool and creates lovely things like:

  snaps:
  - name: core18
    snap-id: CSO04Jhav2yK0uz97cr0ipQRyqg0qQL6
    channel: latest/stable
    file: core18_1704.snap
  - name: subiquity
    snap-id: ba2aj8guta0zSRlT3QM5aJNAUXPlBtf9
    channel: latest/stable/ubuntu-20.04
    classic: true
    contact: https://bugs.launchpad.net/subiquity
    file: subiquity_1704.snap

  It has:
  - incremental seeding
  - validating seeds

  However it lacks:
  - cohort support
  - auto-seeding snapd

  But it does extensive validation and prevents broken seeds.

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