[Bug 2033308] Re: live-build manipulation of conffiles results in them being treated as modified by end user

[Michael Hudson-Doyle]

So I have a few thoughts/questions here:

1) It would really be better if we could put packaged apt preference
files somewhere not in /etc (systemd-style /run-/etc/-/user searching
for everything please)

2) Why isn't https://git.launchpad.net/livecd-rootfs/tree/live-
build/ubuntu-cpc/hooks.d/chroot/100-preserve-apt-prefs.chroot preventing
this? That's what it's there for.

3) How many images are out there with this damage? If it's just mantic
well whatever but if there are lunar or even older images out there that
are missing these files then we'll need to do something in ubuntu-
advantage-tools to avoid these prompts on upgrade (I'm not sure what,
mind -- we could do hacks to avoid these files being marked as
conffiles, which will probably just mean that dpkg stomps on these files
on upgrade -- which might be ok? Otherwise it's delicate preinst games I
guess).

I think the live-build changes are /probably/ ok. I'll try to meditate
on these a little more later. It might be better to use a different
backup location than the existing code in livecd-rootfs tries to use?
Building a test ubuntu-cpc build is nice but really it's the impact on
other project builds that's hard to predict...

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https://bugs.launchpad.net/bugs/2033308

Title:
  live-build manipulation of conffiles results in them being treated as
  modified by end user

Status in live-build package in Ubuntu:
  New
Status in livecd-rootfs package in Ubuntu:
  New
Status in ubuntu-advantage-tools package in Ubuntu:
  Invalid

Bug description:
  When updating ubuntu-advantage-tools from 29 -> 29.2, a conffile prompt is seen.
  This is on a system that is presumed to not have modified the relevant files.

  
  Setting up ubuntu-advantage-tools (29.2) ...

  Configuration file '/etc/apt/preferences.d/ubuntu-pro-esm-apps'
   ==> Deleted (by you or by a script) since installation.
   ==> Package distributor has shipped an updated version.
     What would you like to do about it ?  Your options are:
      Y or I  : install the package maintainer's version
      N or O  : keep your currently-installed version
        D     : show the differences between the versions
        Z     : start a shell to examine the situation
   The default action is to keep your current version.
  *** ubuntu-pro-esm-apps (Y/I/N/O/D/Z) [default=N] ?

  Configuration file '/etc/apt/preferences.d/ubuntu-pro-esm-infra'
   ==> Deleted (by you or by a script) since installation.
   ==> Package distributor has shipped an updated version.
     What would you like to do about it ?  Your options are:
      Y or I  : install the package maintainer's version
      N or O  : keep your currently-installed version
        D     : show the differences between the versions
        Z     : start a shell to examine the situation
   The default action is to keep your current version.
  *** ubuntu-pro-esm-infra (Y/I/N/O/D/Z) [default=N] ?

  steps to reproduce (at least today):
  lxc launch ubuntu-daily:mantic
  in container:
   apt update
   apt install ubuntu-advantage-tools

  Discovered in subiquity CI -
  https://github.com/canonical/subiquity/actions/runs/6003040269/job/16280611441?pr=1773#step:3:1080

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