[Bug 1952093] Re: Seeded snaps broken in the Focal dailies

[Brian Murray]

Hello Paride, or anyone else affected,

Accepted livecd-rootfs into focal-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.664.36 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1952093

Title:
  Seeded snaps broken in the Focal dailies

Status in livecd-rootfs package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Focal:
  Fix Committed

Bug description:
  [impact]
  In the recent focal-live-server-amd64 dailies, e.g. in:

  Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20211124)

  some snap related errors are printed to the terminal at boot time, and
  then subiquity doesn't start. Jumping to tty2 and doing a simple

    systemctl status snapd

  shows that snapd complains about the state of the core18 snap, and
  indeed /snap/core18/current/ is empty. Reinstalling core18 and
  refreshing subiquity from the candidate channel makes it start
  normally. This looks like a problem in the snap seeding.

  This turns out to be because the core18_*.snap file is missing from
  the live layer, thanks to some over enthusiastic cleanup in a livecd-
  rootfs hook.

  [test case]
  build a focal live-server iso with livecd-rootfs. check it boots.

  [regression potential]
  the fix touches a hook that only runs for live-server builds, so even if buggy it can't really make things worse (as current ISOs are basically inoperable)

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