[Bug 1999275] Re: systemd-binfmt.service fails in tests-in-lxd

[Nick Rosbrook]

This has been resolved upstream[1] and I will bring the patches into
lunar.

[1] https://github.com/systemd/systemd/pull/25693

** Changed in: systemd (Ubuntu)
       Status: New => Triaged

** Changed in: systemd (Ubuntu)
   Importance: Undecided => High

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Title:
  systemd-binfmt.service fails in tests-in-lxd

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  The systemd-binfmt.service requires read-write access to
  /proc/sys/fs/binfmt_misc, but this is not possible in unprivileged LXD
  containers without binfmt_misc namespace support in the kernel [1].
  When this service is triggered, we get the following failure from
  test_no_failed within tests-in-lxd:

  No failed units ... -------- journal for failed service systemd-binfmt.service -----------
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: Starting Set Up Additional Binary Formats...
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]: Failed to flush binfmt_misc rules, ignoring: Permission denied
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]: /usr/lib/binfmt.d/python3.10.conf:1: Failed to delete rule 'python3.10', ignoring: Permission denied
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]: /usr/lib/binfmt.d/python3.10.conf:1: Failed to add binary format 'python3.10': Permission denied
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: systemd-binfmt.service: Main process exited, code=exited, status=1/FAILURE
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: systemd-binfmt.service: Failed with result 'exit-code'.
  Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: Failed to start Set Up Additional Binary Formats.
  FAIL
  test_rsyslog (__main__.ServicesTest) ... ok
  test_tmp_cleanup (__main__.ServicesTest) ... ok
  test_tmp_mount (__main__.ServicesTest) ... ok
  test_udev (__main__.ServicesTest) ... skipped 'udev does not work in containers'

  ======================================================================
  FAIL: test_no_failed (__main__.ServicesTest)
  No failed units
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.METFVA/build.LjB/real-tree/debian/tests/boot-and-services", line 74, in test_no_failed
      self.assertEqual(failed, [])
  AssertionError: Lists differ: ['systemd-binfmt.service loaded failed failed Set Up Additional Binary Formats'] != []

  First list contains 1 additional elements.
  First extra element 0:
  'systemd-binfmt.service loaded failed failed Set Up Additional Binary Formats'

  - ['systemd-binfmt.service loaded failed failed Set Up Additional Binary Formats']
  + []

  The systemd-binfmt.service is only started if there is a configuration
  to be loaded from one of the valid configuration directories (e.g.
  /usr/lib/binfmt.d/python3.10.conf). Previously, no such file was
  installed in the test LXD images, but a recent upload of python3.10
  added support for systemd-binfmt [2].

  [1] https://discuss.linuxcontainers.org/t/3-1-0-binfmt-support-service-in-unprivileged-guest-requires-write-access-on-hosts-proc-sys-fs-binfmt-misc/5249
  [2] https://launchpadlibrarian.net/632281245/python3.10_3.10.8-1_3.10.8-3.diff.gz

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