[Bug 1957123] Re: livecd-rootfs incorrectly installs core snap as implicit dep of other base snaps

[Timo Aaltonen]

Hello Steve, 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/2.664.37 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/1957123

Title:
  livecd-rootfs incorrectly installs core snap as implicit dep of other
  base snaps

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

Bug description:
  [Justification]
  The focal and jammy desktop images include a gtk-common-themes snap which uses base: bare.  This is obviously supposed to mean the snap has no external dependencies on a particular core snap.  Unfortunately, the logic in livecd-rootfs is broken, and when processing the bare snap itself, seeing that it has no base: declared in its own metadata, interprets this as meaning there is an implicit dependency on the core snap and pulls in a whole separate root filesystem pointlessly.

  We should:
  - fix livecd-rootfs to not look for base snaps of snaps which are themselves type: base
  - make it a fatal build error for focal an later to try to build an image that pulls in the core snap, since this is legacy (the Ubuntu 16.04 rootfs should not be used in Ubuntu 20.04 and later images) and it's a bad bug if it does get pulled in.

  [Test case]
  All daily images should build successfully for all flavors with the updated livecd-rootfs.  If this change introduces any build failures, it should be reverted until the underlying problem (seeding a snap that requires 'core' as a base) can be resolved.

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