[Bug 1968873] Please test proposed package

[Łukasz Zemczak]

Hello Robie, or anyone else affected,

Accepted livecd-rootfs into jammy-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.765.33 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-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. 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.

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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 cloud-init package in Ubuntu:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in cloud-init source package in Focal:
  Fix Released
Status in livecd-rootfs source package in Focal:
  Fix Committed
Status in cloud-init source package in Impish:
  Won't Fix
Status in livecd-rootfs source package in Impish:
  Won't Fix
Status in cloud-init source package in Jammy:
  Fix Released
Status in livecd-rootfs source package in Jammy:
  Fix Committed

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.

  This needs to be backported to >= Focal so upgrades from Focal to
  Jammy do not result in the ucf prompt.

  [Test Plan]
  1) build image (eg. with ubuntu-old-fashioned) with the changes from here
  2) check that there is no modification for /etc/ssh/sshd_config via:
    $ ucfq openssh-server
  3) check that the new configuration file under /etc/ssh/sshd_config.d/10-cloudimg-settings.conf is there and contains the correct setting

  [Where problems could occur]
  Password authentication could be enabled after that change because sshd does not read the new configuration for whatever reason. This can be checked with "sudo sshd -T|grep passwordauthentication"

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