[Bug 1968873] Re: Regression: images ship with modified configuration file

[Utkarsh Gupta]

** No longer affects: livecd-rootfs (Ubuntu)

** No longer affects: livecd-rootfs (Ubuntu Focal)

** No longer affects: livecd-rootfs (Ubuntu Impish)

** No longer affects: livecd-rootfs (Ubuntu Jammy)

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: livecd-rootfs (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu)
     Assignee: (unassigned) => Thomas Bechtold (toabctl)

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => In Progress

** Changed in: livecd-rootfs (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1968873

Title:
  Regression: images ship with modified configuration file

Status in livecd-rootfs:
  In Progress
Status in livecd-rootfs package in Ubuntu:
  In Progress
Status in livecd-rootfs source package in Focal:
  New
Status in livecd-rootfs source package in Impish:
  New
Status in livecd-rootfs source package in Jammy:
  New

Bug description:
  This cloud image:

  build_name: server
  serial: 20220411.2

  ...ships with a "user-modified" /etc/ssh/sshd_config. This results in
  a confusing ucf prompt when upgrading from Focal to Jammy.

  It looks like this is being done here:
  https://git.launchpad.net/ubuntu/+source/livecd-rootfs/tree/live-
  build/ubuntu-cpc/hooks.d/chroot/052-ssh_authentication.chroot

  User impact: this messes up automation; it is a common use of cloud
  images for users to automate their server deployments which generally
  involves running a dist-upgrade and then bootstrapping some kind of
  configuration management system.

  As well as during an upgrade between releases, this will happen if
  openssh-server needs to change its /etc/ssh/sshd_config in an SRU or
  security update. Even users who have not touched /etc/ssh/sshd_config
  will be told that they have and the default is to keep the user
  "modified" version, so the change will not be applied.

  Workaround: users can use something like: apt-get update &&
  UCF_FORCE_CONFOLD=1 apt-get -y dist-upgrade. Note that to avoid
  prompts in various other cases users should also set
  DEBIAN_FRONTEND=noninteractive, run apt-get with -o Dpkg::Options::="
  --force-confdef" -o Dpkg::Options::="--force-confold" and consider
  redirecting stdin from /dev/null.

  Background:

  This has happened multiple times before. Please put CI in place to
  avoid this regressing again. See bug 1485685, bug 1581044, bug
  1581046, bug 1323772, bug 1747464.

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