The setuid helper of D-Bus is responsible for "service activation".
It looks for '.service' files in fixed locations, but the default locations
make no sense (see below), so replace them with /etc/dbus-1/system-services.

--- dbus-1.10.0/dbus/dbus-sysdeps-util-unix.c	2015-10-22 00:07:03.829251854 +0200
+++ dbus-1.10.0/dbus/dbus-sysdeps-util-unix.c	2015-10-22 00:07:14.893445175 +0200
@@ -1410,10 +1410,7 @@ _dbus_get_standard_system_servicedirs (D
    * be available.
    */
   static const char standard_search_path[] =
-    "/usr/local/share:"
-    "/usr/share:"
-    DBUS_DATADIR ":"
-    "/lib";
+    "/etc";
   DBusString servicedir_path;
 
   _dbus_string_init_const (&servicedir_path, standard_search_path);
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<tr><td><span title='2017-07-04 23:45:12 +0200'>2017-07-04</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=6d9a859038b33c1bde35df915f101b58774bce06'>linux-initrd: Avoid monadic style a bit.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/linux-initrd.scm (expression-&gt;initrd): Use 'program-file'
for 'init'.
(flat-linux-module-directory): Use 'computed-file' instead of
'gexp-&gt;derivation'.
(raw-initrd): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-07-02 20:27:26 +0200'>2017-07-02</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=ed3485fa9c6c758bff1fb7391c8360c2c93e7337'>linux-initrd: Add isofs if necessary.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/linux-initrd.scm (base-initrd): Add isofs.
</span></span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2017-05-19 12:59:25 +0200'>2017-05-19</span></td><td><a href='/guix/commit/gnu/system/linux-initrd.scm?id=4d415f0c3c0cf4acbc1297ccf2b27121846a4289'>vm: Support creating FAT partitions.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/vm.scm (create-ext-file-system, create-fat-file-system): New procedures.
(format-partition): Use them. Error for unknown file systems.
* gnu/system/vm.scm (qemu-image): Include DOSFSTOOLS.
* gnu/system/linux-initrd.scm (base-initrd): Always add nls_is8859-1.ko.
</span></span></td><td>Marius Bakke</td></tr>