** Description changed:
- 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.
+ [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.
** Also affects: livecd-rootfs (Ubuntu Focal)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1957123
Title:
livecd-rootfs incorrectly installs core snap as implicit dep of other
base snaps
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