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='2023-06-18 02:00:10 +0200'>2023-06-18</span></td><td><a href='/guix/commit/gnu/system/uuid.scm?id=65ed7a61f1ad01da440f0e7e08bfc32b43deed73'>uuid: Fix NTFS UUID stringification.</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously, (ntfs-uuid-&gt;string (string-&gt;ntfs-uuid"5234ED0D34ECF53F"))
would yield "5234EDD34ECF53F".

Reported by sughosha in #guix.

* gnu/system/uuid.scm (ntfs-uuid-&gt;string): Pad hex bytes with zero when
needed.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-09-23 18:17:17 +0200'>2021-09-23</span></td><td><a href='/guix/commit/gnu/system/uuid.scm?id=90604348e14913da48327da05113d7da8ae7655a'>uuid: Support XFS.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/uuid.scm (string-&gt;xfs-uuid): New procedure.
(%uuid-parsers, %uuid-printers): Add ‘xfs’ file system type.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>