[Bug 2027826] Re: Mantic Cloud-Images on amd64 Fail To Preseed Snaps

[Michael Hudson-Doyle]

On Thu, 27 Jul 2023 at 03:55, Steve Langasek <2027826 at bugs.launchpad.net>
wrote:

> > pardon my ignorance, but is that done in the STRUCTURE file?
>
> That was what I had in mind, but the implementation says:
>

Yeah, the STRUCTURE file is actually kind of the opposite of a dependency:
if STRUCTURE says seed2: seed1 then the package list for seed2 will not
include any packages that are in seed1! The use case for this is package
pools on ISOs, for example the declaration

server-ship-live: server-minimal

Means that we do not end up with any packages in the pool that are always
going to be installed in the target system anyway.

I had forgotten / failed to find the task-seed header which was one of the
reasons I hadn't gotten around to replying to this bug!

This is all a big mess yes.

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https://bugs.launchpad.net/bugs/2027826

Title:
  Mantic Cloud-Images on amd64 Fail To Preseed Snaps

Status in cloud-images:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  Starting on June 19th, Mantic Cloud Images (in development) on amd64
  are failing to pre-seed snaps provided in Seeds. This is observable by
  taking any Mantic Cloud Server (not minimal) image and checking if
  `lxd` is installed.

  Troubleshooting steps so far:

  1. using `ubuntu-bartender`[0] and local checkouts, I bisected
  `livecd-rootfs`, starting from commits before June 19th.
  Unfortunately, due to various other build issues, I was not able to
  successfully find a commit. Commits <= tag 2.849 fail to build, and
  commits after fail to have snaps preseeded. More work can be done here
  to find a successfully building commit (I did not go a back through
  the entire history, only to tag 2.848)

  2. I attempted a revert of tag 2.890 specific code, which landed
  around the time failures to pre-seed began. Reverting that specific
  code did not result in fixing the issue.

  3. a build and check of the log at `lb_chroot_cache save` will show
  the issue. in a successful build, the apt cache is updated and snaps
  are preseeded.


  [0] https://github.com/ubuntu-bartenders/ubuntu-old-fashioned

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