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

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 245.4-4ubuntu3.18

---------------
systemd (245.4-4ubuntu3.18) focal; urgency=medium

  [ Nick Rosbrook ]
  * core: make sure we don't get confused when setting TERM for a tty fd
    (LP: #1959475)
    File: debian/patches/lp1959475-core-make-sure-we-don-t-get-confused-when-setting-TERM-fo.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b10c6853050dde26665caf3b15444d768d2bc498
  * shared/calendarspec: when mktime() moves us backwards, jump forward
    (LP: #1966800)
    File: debian/patches/lp1966800-shared-calendarspec-when-mktime-moves-us-backwards-jump-f.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=1f063541e44f6ff1a6904676d4264a2e49a09594
  * network: do not remove localhost address (LP: #1979951)
    File: debian/patches/lp1979951-network-do-not-remove-localhost-address.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=87f872b8c5451f353601fb606e7fd7a479217cef
  * units: remove the restart limit on the modprobe at .service (LP: #1982462)
    File: debian/patches/lp1982462-units-remove-the-restart-limit-on-the-modprobe-.service.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=68353ffaf3539e6a58ef62a8b50850f56eae29ea

  [ Mustafa Kemal Gilor ]
  * d/p/lp1978079-efi-pstore-not-cleared-on-boot.patch: pstore: Run after
    modules are loaded. Thanks to Alexander Graf <graf at amazon.com>.
    (LP: #1978079)
    Author: Mustafa Kemal Gilor
    File: debian/patches/lp1978079-efi-pstore-not-cleared-on-boot.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=6e60756f2079d6408abdb967127a1d9b9a0eba8c

 -- Nick Rosbrook <nick.rosbrook at canonical.com>  Wed, 31 Aug 2022
11:27:33 -0400

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

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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 Released

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 changes a path_equal() call to path_equal_ptr() which NULL-
  checks before calling path_compare(). This avoids an assertion failure
  in path_compare() and allows the term to be correctly configured in
  execution environments requiring one. If were regressions were to
  occur, it would be related to this configuration.

  [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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