[Bug 1828500] Re: snapd fails always in Optimised Ubuntu Desktop images available in Microsoft Hyper-V gallery

[Launchpad Bug Tracker]

This bug was fixed in the package livecd-rootfs - 2.525.28

---------------
livecd-rootfs (2.525.28) bionic; urgency=medium

  [ Tobias Koch ]
  * Do proper error checking when calling snap-tool info to determine
    the base of a snap. (LP: #1828500)

  [ Michael Vogt ]
  * Run "snap debug validate-seed" during preseeding to do basic validation of
    the generated seed.yaml

  [ Iain Lane ]
  * Seed core for non minimized builds, as it is still required (LP:
    #1836594).

 -- Iain Lane <iain.lane at canonical.com>  Tue, 16 Jul 2019 13:20:18 +0100

** Changed in: livecd-rootfs (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1828500

Title:
  snapd fails always in  Optimised Ubuntu Desktop images available in
  Microsoft Hyper-V gallery

Status in livecd-rootfs package in Ubuntu:
  Confirmed
Status in livecd-rootfs source package in Bionic:
  Fix Released
Status in livecd-rootfs source package in Disco:
  Fix Committed

Bug description:
  [Impact]

  * Failing to do error checks on `snap-tool info` calls while
  determining the bases of snaps can lead to inconsistently-seeded
  images as reported in the original bug report below.

  * This affects all stable releases which use automatic detection of
  the base snap during image builds.

  * The changes proposed introduce extra error checking which should
  result in a build error, if the `snap-tool info` call fails, thus
  preventing distribution of a broken image.

  [Test Case]

  * It may be tricky to reproduce the exact error on demand. But it
  should be clear by looking at the code path in

  https://code.launchpad.net/~tobijk/livecd-rootfs/+git/livecd-
  rootfs/+merge/370096

  that the scenario described below may arise.

  * A way to test that the changes have no *negative* impact on
  functionality is to run a script such as

      https://pastebin.ubuntu.com/p/wQknctr6ys/

  and compare it against the expected result

      https://pastebin.ubuntu.com/p/N8PXRJJV9b/

  (In this case both core and core18 should have been seeded.) and

  [Regression Potential]

  * The regression potential for these changes is low, as they only add
  extra error checking but do not change the existing logic.

  --- Original Bug Report ---

  Alway fails in both 18.04.2 and 19.04
  Reporting the bug failed too yesterday.
  As a consequence LivePatch and everything else fails that is based on snapd.
  This makes system unusable. This is a supported configuration.

  https://blog.ubuntu.com/2018/09/17/optimised-ubuntu-desktop-images-available-in-microsoft-hyper-v-gallery
  https://blog.ubuntu.com/2019/05/07/19-04-disco-dingo-now-available-as-optimised-desktop-image-for-hyper-v

  xx at xenial-Virtual-Machine:~$ sudo snap install vscode
  [sudo] password for peterg:
  error: too early for operation, device not yet seeded or device model not acknowledged
  xx at xenial-Virtual-Machine:~$ journalctl -b -u snapd --full --no-pager
  -- Logs begin at Thu 2019-05-09 20:06:58 AEST, end at Fri 2019-05-10 13:20:46 AEST. --
  May 10 13:19:59 xenial-Virtual-Machine systemd[1]: Starting Snappy daemon...
  May 10 13:20:00 xenial-Virtual-Machine snapd[566]: AppArmor status: apparmor is enabled and all features are available
  May 10 13:20:00 xenial-Virtual-Machine snapd[566]: helpers.go:717: cannot retrieve info for snap "gnome-calculator": cannot find installed snap "gnome-calculator" at revision 352: missing file /snap/gnome-calculator/352/meta/snap.yaml
  May 10 13:20:00 xenial-Virtual-Machine snapd[566]: daemon.go:379: started snapd/2.38+18.04 (series 16; classic) ubuntu/18.04 (amd64) linux/4.15.0-48-generic.
  May 10 13:20:00 xenial-Virtual-Machine systemd[1]: Started Snappy daemon.
  May 10 13:20:46 xenial-Virtual-Machine snapd[566]: api.go:1071: Installing snap "vscode" revision unset

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: snapd 2.38+18.04
  ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
  Uname: Linux 4.15.0-48-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 10 13:21:25 2019
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: snapd
  UpgradeStatus: No upgrade log present (probably fresh install)

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