makeDBusConf: init

Use XSLT transform to modify stock dbus configuration file. This is needed
because some dbus components doesn't support <include> so we need to put our
core configuration in the main file.

pkgs/development/libraries/dbus/make-dbus-conf.nix

@@ -0,0 +1,27 @@
+{ runCommand, libxslt, dbus, serviceDirectories ? [], suidHelper ? "/var/setuid-wrappers/dbus-daemon-launch-helper" }:
+
+/* DBus has two configuration parsers -- normal and "trivial", which is used
+ * for suid helper. Unfortunately the latter doesn't support <include>
+ * directive. That means that we can't just place our configuration to
+ * *-local.conf -- it needs to be in the main configuration file.
+ */
+runCommand "dbus-1"
+  {
+    buildInputs = [ libxslt ];
+    inherit serviceDirectories suidHelper;
+  }
+  ''
+    mkdir -p $out
+
+    xsltproc \
+      --stringparam serviceDirectories "$serviceDirectories" \
+      --stringparam suidHelper "$suidHelper" \
+      --path ${dbus.doc}/share/xml/dbus \
+      ${./make-system-conf.xsl} ${dbus}/share/dbus-1/system.conf \
+      > $out/system.conf
+    xsltproc \
+      --stringparam serviceDirectories "$serviceDirectories" \
+      --path ${dbus.doc}/share/xml/dbus \
+      ${./make-session-conf.xsl} ${dbus}/share/dbus-1/session.conf \
+      > $out/session.conf
+  ''