[Bug 1820840] Re: [Disco] Ubuntu Desktop fails to build - snap-tool download: failed to get details for 'core18' in 'stable/ubuntu-19.04' on 'amd64': No revision was found in the Store.

[Łukasz Zemczak]

Yes, indeed this does not address the need of seeding core18, my bad
that I didn't consider it as a primary issue. I guess the bug
description here confused me, as it only mentioned the issue with the
track being used. Let me follow up with an upload for that. What I'll
propose is special-casing the snap-tool, since as per my comments in the
MP, snap prepare-image --classic doesn't do auto-resolving of base as
well currently.

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Title:
  [Disco] Ubuntu Desktop fails to build - snap-tool download: failed to
  get details for 'core18' in 'stable/ubuntu-19.04' on 'amd64': No
  revision was found in the Store.

Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in livecd-rootfs source package in Disco:
  In Progress

Bug description:
  core18 has been seeded on Ubuntu Desktop minimal and since today
  builds are failing with:

  + SNAPPY_STORE_NO_CDN=1 /usr/share/livecd-rootfs/snap-tool download --cohort-key= --channel=stable core
  renamed 'chroot/var/lib/snapd/seed/core_6531.assert' -> 'chroot/var/lib/snapd/seed/assertions/core_6531.assert'
  renamed 'chroot/var/lib/snapd/seed/core_6531.snap' -> 'chroot/var/lib/snapd/seed/snaps/core_6531.snap'
  + cd chroot/var/lib/snapd/seed
  + SNAPPY_STORE_NO_CDN=1 /usr/share/livecd-rootfs/snap-tool download --cohort-key= --channel=stable/ubuntu-19.04 core18
  snap-tool download: failed to get details for 'core18' in 'stable/ubuntu-19.04' on 'amd64': No revision was found in the Store.
  If the channel (stable/ubuntu-19.04) includes '*/ubuntu-##.##' track per 
  Ubuntu policy (ex. stable/ubuntu-18.04) the publisher will need 
  to temporarily create the channel/track to allow fallback during
  download (ex. stable/ubuntu-18.04 falls back to stable if the
  prior had been created in the past).

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: livecd-rootfs (not installed)
  ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
  Uname: Linux 4.19.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu23
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Mar 19 12:15:26 2019
  InstallationDate: Installed on 2014-07-15 (1708 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140520)
  SourcePackage: livecd-rootfs
  UpgradeStatus: Upgraded to disco on 2018-03-24 (359 days ago)

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