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.

gettys are nowadays mostly autospawned and hence usually subject to
being shut down on isolate requests, since they are no dependency of any
other unit. This is a bad idea if the user isolates between
multi-user.graphical and graphical.target, hence exclude them from the
isolation.

This has the effect that gettys no longer cleaned up when
emergency.target is isolated, which might actualy be considered a
feature, even though it is a change from previous behaviour...

Note that the one getty that really matters (the one on tty1) is still
removed when isolating to emergency.target since it conflicts with
emergency.service.

Before:
  # stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
  Access: 2012-04-11 21:32:48.444920237 +0200
  # systemd-tmpfiles --clean
  # stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
  Access: 2012-04-11 21:36:27.628925459 +0200

After:
  # stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
  Access: 2012-04-11 21:32:48.444920237 +0200
  # ./systemd-tmpfiles --clean
  # stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
  Access: 2012-04-11 21:32:48.444920237 +0200

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=810257

https://bugzilla.redhat.com/show_bug.cgi?id=811537

Leave the env vars used in the container/initrd logic set for PID1, but
don't inherit them to any children.

This prevents linking of selinux and libdl for another 15 binaries.

This extends the shutdownd interface to expose schedule shutdown
information in /run/systemd/shutdown/schedule.

This also cleans up the shutdownd protocol and documents it in a header
file sd-shutdown.h.

This is supposed to be used by client code that wants to control and
monitor scheduled shutdown.

systemctl: don't forward poweroff/reboot requests to logind if time is set or immediate or dry-run execution is requested

logind can't handle scheduled poweroff/reboot requests, nor
immediate/dry-run requests, hence don't attempt forwarding to logind if
these options are used.

This separates user/group NSS lookups from host/network NSS lookups.

By default order all network mounts after host/network NSS lookups now,
and logind execution after user/group NSS lookups.

Only 34 of 74 tools need libselinux linked, and libselinux is a pain
with its unconditional library constructor.

The defined function can be used as BusPropertySetCallback.

BusPropertyCallback already has the argument. It is necesary for the
callback to know what data to access.

In the current code setting the return argument is never reached.