[gnome-screensaver] Check for logind, not for systemd

[Martin Pitt <martinpitt src gnome org>]

commit fd353244020cf53ce58f4abf69a5ec7893ca1fd1
Author: Martin Pitt <martinpitt gnome org>
Date:   Thu Mar 21 11:24:20 2013 +0100

    Check for logind, not for systemd
    
    It is possible to build systemd without logind, in which case
    /sys/fs/cgroup/systemd would still exist. Check for /run/systemd/seats instead,
    as recommended by systemd upstream.
    
    For details, see:
    <https://mail.gnome.org/archives/desktop-devel-list/2013-March/msg00092.html>
    
    Drop the now unnecessary linking against libsystemd-daemon.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=696264

 configure.ac           |    2 +-
 src/gs-listener-dbus.c |    5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0e8f339..3451989 100644
--- a/configure.ac
+++ b/configure.ac
@@ -601,7 +601,7 @@ AC_ARG_WITH(systemd,
             [with_systemd=$withval], [with_systemd=auto])
 
 PKG_CHECK_MODULES(SYSTEMD,
-                  [libsystemd-login libsystemd-daemon],
+                  [libsystemd-login],
                   [have_systemd=yes], [have_systemd=no])
 
 if test "x$with_systemd" = "xauto" ; then
diff --git a/src/gs-listener-dbus.c b/src/gs-listener-dbus.c
index 28774a0..7f718fa 100644
--- a/src/gs-listener-dbus.c
+++ b/src/gs-listener-dbus.c
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <string.h>
+#include <unistd.h>
 
 #include <glib/gi18n.h>
 
@@ -33,7 +34,6 @@
 #include <dbus/dbus-glib-lowlevel.h>
 
 #ifdef WITH_SYSTEMD
-#include <systemd/sd-daemon.h>
 #include <systemd/sd-login.h>
 #endif
 
@@ -1478,7 +1478,8 @@ gs_listener_init (GSListener *listener)
         listener->priv = GS_LISTENER_GET_PRIVATE (listener);
 
 #ifdef WITH_SYSTEMD
-        listener->priv->have_systemd = sd_booted () > 0;
+        /* check if logind is running */
+        listener->priv->have_systemd = (access("/run/systemd/seats/", F_OK) >= 0);
 #endif
 
         gs_listener_dbus_init (listener);