[Bug 1959475] Re: "machinectl shell" connections immediately terminated

[Łukasz Zemczak]

Hello renbag, or anyone else affected,

Accepted systemd into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/245.4-4ubuntu3.18 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-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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.

** Changed in: systemd (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1959475

Title:
  "machinectl shell" connections immediately terminated

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  This bug prevents users on Impish and newer from connecting to Focal
  systemd containers using `machinectl shell`. This limits users ability
  to manage containers spawned with systemd-nspawn.

  [Test Plan]

  On a Jammy host, do the following:

  * Install systemd-container and debootstrap if necessary:

    $ sudo apt install debootstrap systemd-container

  * Create a Focal filesystem for the container:

    $ sudo debootstrap --arch=<arch> focal
  /var/lib/containers/lp1959475/

  * Launch the container:

    $ sudo systemd-nspawn -D /var/lib/containers/lp1959475/ --machine
  test-container

  * Inside the container, set a password for root and then exit:

    $ passwd # Enter password when prompted
    $ exit

  * Re-launch the container with -b option:

    $ sudo systemd-nspawn -D /var/lib/containers/lp1959475/ --machine
  test-container -b

  * In a separate terminal window, try to connect to the container:

    $ sudo machinectl shell test-container

  * Observe the "Connection to machine test-container terminated" error
  message.

  [Where problems could occur]

  The patch expands the case where the TERM variable is inherited from
  PID 1 when building an execution environment, e.g. for a container. If
  problems were to occur, it would be related to the value of TERM in
  environments forked off of PID 1.

  [Other Info]

  This bug occurs when trying to connect to a Focal container from e.g. a Jammy host. For SRU verification, the container
  should be Focal, and the host should be Jammy. The -proposed package should be installed in the Focal container.

  [Original Description]

  The command "machinectl shell" does not work in systemd
  249.9-0ubuntu2:

  $ sudo machinectl shell ns-xxx
  Connected to machine ns-xxx. Press ^] three times within 1s to exit session.

  Connection to machine ns-xxx terminated.

  The issue seems to be described here:
  https://forum.manjaro.org/t/the-machinectl-shell-command-stopped-working-after-systemd-upgrade-to-250-2-1/99899
  https://github.com/systemd/systemd/issues/22234

  and solved here:

  https://github.com/systemd/systemd/commit/e8cf09b2a2ad0d48e5493050d54251d5f512d9b6

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