From 287419c119ef961db487a281162ab037eba70c61 Mon Sep 17 00:00:00 2001 From: Alban Crequy Date: Fri, 18 Sep 2015 13:37:34 +0200 Subject: containers: systemd exits with non-zero code When a systemd service running in a container exits with a non-zero code, it can be useful to terminate the container immediately and get the exit code back to the host, when systemd-nspawn returns. This was not possible to do. This patch adds the following to make it possible: - Add a read-only "ExitCode" property on PID 1's "Manager" bus object. By default, it is 0 so the behaviour stays the same as previously. - Add a method "SetExitCode" on the same object. The method fails when called on baremetal: it is only allowed in containers or in user session. - Add support in systemctl to call "systemctl exit 42". It reuses the existing code for user session. - Add exit.target and systemd-exit.service to the system instance. - Change main() to actually call systemd-shutdown to exit() with the correct value. - Add verb 'exit' in systemd-shutdown with parameter --exit-code - Update systemctl manpage. I used the following to test it: | $ sudo rkt --debug --insecure-skip-verify run \ | --mds-register=false --local docker://busybox \ | --exec=/bin/chroot -- /proc/1/root \ | systemctl --force exit 42 | ... | Container rkt-895a0cba-5c66-4fa5-831c-e3f8ddc5810d failed with error code 42. | $ echo $? | 42 Fixes https://github.com/systemd/systemd/issues/1290 --- units/exit.target | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 units/exit.target (limited to 'units/exit.target') diff --git a/units/exit.target b/units/exit.target new file mode 100644 index 0000000000..f5f953d112 --- /dev/null +++ b/units/exit.target @@ -0,0 +1,17 @@ +# This file is part of systemd. +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. + +[Unit] +Description=Exit the container +Documentation=man:systemd.special(7) +DefaultDependencies=no +Requires=systemd-exit.service +After=systemd-exit.service +AllowIsolate=yes + +[Install] +Alias=ctrl-alt-del.target -- cgit v1.2.3-54-g00ecf