core: convert PID 1 to libsystemd-bus

This patch converts PID 1 to libsystemd-bus and thus drops the
dependency on libdbus. The only remaining code using libdbus is a test
case that validates our bus marshalling against libdbus' marshalling,
and this dependency can be turned off.

This patch also adds a couple of things to libsystem-bus, that are
necessary to make the port work:

- Synthesizing of "Disconnected" messages when bus connections are
  severed.

- Support for attaching multiple vtables for the same interface on the
  same path.

This patch also fixes the SetDefaultTarget() and GetDefaultTarget() bus
calls which used an inappropriate signature.

As a side effect we will now generate PropertiesChanged messages which
carry property contents, rather than just invalidation information.

1 files changed, 3 insertions, 7 deletions

diff --git a/src/core/dbus-path.h b/src/core/dbus-path.h
index c945f7d588..e9558f81b5 100644
--- a/src/core/dbus-path.h
+++ b/src/core/dbus-path.h
@@ -21,12 +21,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <dbus/dbus.h>
 
-#include "unit.h"
+#include "sd-bus.h"
 
-DBusHandlerResult bus_path_message_handler(Unit *u, DBusConnection *c, DBusMessage *message);
-
-extern const char bus_path_interface[];
-
-extern const char bus_path_invalidating_properties[];
+extern const sd_bus_vtable bus_path_vtable[];
+extern const char* const bus_path_changing_properties[];