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='2024-08-11 02:00:00 +0200'>2024-08-11</span></td><td><a href='/guix/commit/gnu/tests/ldap.scm?id=902b15b24d6ea2a1e255b88dff7670e8a95cb9a9'>gnu: Replace (almost) all uses of /run/setuid-programs.</a><span class='msg-avail'>...<span class='msg-tooltip'>…those good for master, anyway.

* gnu/packages/admin.scm (ktsuss, opendoas, hosts)
[arguments]: Replace /run/setuid-programs with /run/privileged/bin.
* gnu/packages/containers.scm (slirp4netns)[arguments]: Likewise.
* gnu/packages/debian.scm (pbuilder)[arguments]: Likewise.
* gnu/packages/disk.scm (udevil)[arguments]: Likewise.
* gnu/packages/enlightenment.scm (efl, enlightenment)
[arguments]: Likewise.
* gnu/packages/gnome.scm (gdm, gnome-control-center)
[arguments]: Likewise.
* gnu/packages/linux.scm (singularity)[arguments]: Likewise.
* gnu/packages/lxde.scm (spacefm)[arguments]: Likewise.
* gnu/packages/monitoring.scm (zabbix-agentd)[arguments]: Likewise.
* gnu/packages/virtualization.scm (ganeti)[arguments]: Likewise.
* gnu/packages/xdisorg.scm (xsecurelock)[arguments]: Likewise.
* gnu/services/dbus.scm (dbus-configuration-directory): Likewise.
* gnu/services/ganeti.scm (%default-ganeti-environment-variables):
Likewise.
* gnu/services/monitoring.scm (zabbix-agent-shepherd-service): Likewise.
* gnu/tests/ldap.scm (marionette): Likewise.
* gnu/tests/monitoring.scm (os): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>