[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.

[Steve Langasek]

> The stable/ubuntu-19.04 track has been created for core18, should fix
this.

As discussed on IRC, I don't think this is the right fix.  We do NOT
want a proliferation of core18 snaps on different per-Ubuntu-release
branches with subtle differences; we expect the base snap to be a common
base that works on all target classic releases and in support of all
snaps using that base.

So the bug here is in livecd-rootfs not knowing to treat core18
specially.  The images are building again, but they're building WRONG,
seeding core18 from the stable/ubuntu-19.04 channel instead of the
stable channel they should be using.

I also don't think the core18 snap belongs in the seed (where it has now
been added).  We do have to seed the gnome-3-28-1804 snap currently, and
that does (and should) carry a per-Ubuntu-release branch, but I think
base snaps should not have to be seeded directly for the same reason we
don't manually seed all the dependencies of the leaf packages.

So I would like to see:

 - livecd-rootfs updated to know when it needs core18 as a base for one of the seeded snaps
 - livecd-rootfs to detect when *all* seeded snaps specify a base:, and if so, seed snapd instead of core
 - core18 removed from the seed.

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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:
  Confirmed
Status in livecd-rootfs source package in Disco:
  Confirmed

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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