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Fix broken systemd shutdown services

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The services systemd-random-seed-save.service and
systemd-update-utmp-shutdown.service from systemd 203 don't work,
because they have a RequiresMountFor dependency on /var/lib and
/var/log.  Such a dependency produces a cycle, causing systemd to drop
those services:

  Fixing conflicting jobs by deleting job poweroff.target/stop
  Deleting job systemd-poweroff.service/stop as dependency of job poweroff.target/stop
  Deleting job umount.target/stop as dependency of job systemd-poweroff.service/stop
  Deleting job -.mount/start as dependency of job umount.target/stop
  Deleting job systemd-random-seed-save.service/start as dependency of job -.mount/start
  Deleting job systemd-update-utmp-shutdown.service/start as dependency of job -.mount/start

Dropping the RequiresMountFor doesn't work either, because then
/var/... may have meen unmounted or remounted read-only.

Upstream systemd fixes this by doing the actual work from an ExecStop
action in an already-running service than conflicts with
shutdown.target.  So I backported that here.  The main consequence is
that wtmp shutdown records now get written properly.

The main lesson: shutdown.target is useless for pulling in services
during shutdown if they need to write anywhere.
This commit is contained in:
Eelco Dolstra 2013-09-22 21:04:54 +02:00
parent f5c4874b05
commit f19065c283
2 changed files with 45 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

9
modules/system/boot/systemd-unit-options.nix
View file

@ -76,6 +76,15 @@ rec {
'';
};
conflicts = mkOption {
default = [];
types = types.listOf types.string;
description = ''
If the specified units are started, then this unit is stopped
and vice versa.
'';
};
requiredBy = mkOption {
default = [];
types = types.listOf types.string;