Only start logind if D-BUS is installed

This fixes the noisy startup failure in environments without D-BUS, such as LXC
containers or servers.

Part of #772700, does not yet address the auto-VT issue

debian/changelog

@@ -28,6 +28,9 @@ systemd (218-8) UNRELEASED; urgency=medium
     first easily causes dependency loops. Thus during boot/shutdown operate
     only on the unit and not on its dependencies, just like SysV behaves.
     (Closes: #777115, LP: #1417010)
+  * Only start logind if D-BUS is installed. This fixes the noisy startup
+    failure in environments without D-BUS, such as LXC containers or servers.
+    (part of #772700, does not yet address the auto-VT issue)
 
  -- Martin Pitt <mpitt@debian.org>  Sun, 01 Feb 2015 22:42:30 +0100
 

debian/patches/Only-start-logind-if-D-BUS-is-installed.patch

@@ -0,0 +1,24 @@
+From: Martin Pitt <martin.pitt@ubuntu.com>
+Date: Mon, 9 Feb 2015 10:53:43 +0100
+Subject: Only start logind if D-BUS is installed
+
+logind fails to start in environments without D-BUS, such as LXC containers or
+servers. Add a startup condition to avoid the very noisy startup failure.
+
+Part of #772700
+---
+ units/systemd-logind.service.in | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/units/systemd-logind.service.in b/units/systemd-logind.service.in
+index f087e99..860cb25 100644
+--- a/units/systemd-logind.service.in
++++ b/units/systemd-logind.service.in
+@@ -12,6 +12,7 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/logind
+ Documentation=http://www.freedesktop.org/wiki/Software/systemd/multiseat
+ Wants=user.slice
+ After=nss-user-lookup.target user.slice
++ConditionFileIsExecutable=/usr/bin/dbus-daemon
+ 
+ # Ask for the dbus socket. If running over kdbus, the socket will
+ # not be actually used.

debian/patches/series

@@ -65,3 +65,4 @@ Accept-mountall-specific-fstab-options.patch
 Fix-usr-remount-failure-for-split-usr.patch
 util-Add-hidden-suffixes-for-ucf.patch
 Drop-rc-local-generator.patch
+Only-start-logind-if-D-BUS-is-installed.patch