> 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.

Eh? That isn't at all what the patch does...

Anyway, that patch only incidentally 'fixes' this, by changing the
caller to use path_equals_ptr which null-checks; while a better commit
is 105396778174a39bb04e9a78281ec7601e252d9f which fixes path_compare()
itself (i.e. for all callers).

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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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