units: don't fail if /root doesn't exist for shell units As discussed on the ML: http://lists.freedesktop.org/archives/systemd-devel/2016-January/035594.html

units: emergency.service: wait for plymouth to shut down Merely calling "plymouth quit" isn't sufficient, as plymouth needs some time to shut down. This needs plymouth --wait (which is a no-op when it's not running). Fixes invisible emergency shell with plymouth running endlessly. https://launchpad.net/bugs/1471258

Use "new" --job-mode= option in more places --irreversible/--ignore-dependencies/--fail are deprececated since 4dc5b821ae737914499119e29811fc3346e3d97c. Also add shell completions for --jobs-mode.

build-sys: lookup for sulogin, it might not be in /sbin

units: update rescue.service and emergency.service ^D works in emergency.service too. One needs to log in when in rescue mode too.

units: make emergency.service conflict with rescue.service They both use StandardInput=tty-force so they cannot be run concurrently. https://bugs.freedesktop.org/show_bug.cgi?id=82778 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=757072

units: make ExecStopPost action part of ExecStart Currently after exiting rescue shell we isolate default target. User might want to isolate to some other target than default one. However issuing systemctl isolate command to desired target would bring system to default target as a consequence of running ExecStopPost action. Having common ancestor for rescue shell and possible followup systemctl default command should fix this. If user exits rescue shell we will proceed with isolating default target, otherwise, on manual isolate, parent shell process is terminated and we don't isolate default target, but target chosen by user. Suggested-by: Michal Schmidt <mschmidt@redhat.com>

core: optionally send SIGHUP in addition to the configured kill signal This is useful to fake session ends for processes like shells.

journal: recommend journalctl -x more often

units: reword rescue mode hints Do not suggest to the user that commands can be issued before logging in. sulogin prints it own message, which mentions ^D, so there's no need to repeat it here.

units: also add journalctl suggestion to emergency.service More often than not we enter emergency.service due to fsck failure, so it makes sense to direct people to the journal to debug those.

man: add Documentation= tags to all kinds of missing units

units: introduce new Documentation= field and make use of it everywhere This should help making the boot process a bit easier to explore and understand for the administrator. The simple idea is that "systemctl status" now shows a link to documentation alongside the other status and decriptionary information of a service. This patch adds the necessary fields to all our shipped units if we have proper documentation for them.

service: introduce Type=idle and use it for gettys Type=idle is much like Type=simple, however between the fork() and the exec() in the child we wait until PID 1 informs us that no jobs are left. This is mostly a cosmetic fix to make gettys appear only after all boot output is finished and complete. Note that this does not impact the normal job logic as we do not delay the completion of any jobs. We just delay the invocation of the actual binary, and only for services that otherwise would be of Type=simple.

relicense to LGPLv2.1 (with exceptions) We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.

units/: use @SYSTEMCTL@ instead of hardcoded paths Especially in the case of --enable-split-usr, several units will point to the wrong location for systemctl. Use @SYSTEMCTL@ which will always contain the proper path.