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, 6 insertions, 34 deletions

diff --git a/src/core/dbus-target.c b/src/core/dbus-target.c
index f143d897fa..205d1c4a88 100644
--- a/src/core/dbus-target.c
+++ b/src/core/dbus-target.c
@@ -19,40 +19,12 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <errno.h>
-
+#include "unit.h"
+#include "target.h"
 #include "dbus-unit.h"
 #include "dbus-target.h"
-#include "dbus-common.h"
-#include "selinux-access.h"
-
-#define BUS_TARGET_INTERFACE                                            \
-        " <interface name=\"org.freedesktop.systemd1.Target\">\n"       \
-        " </interface>\n"
-
-#define INTROSPECTION                                                   \
-        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
-        "<node>\n"                                                      \
-        BUS_UNIT_INTERFACE                                              \
-        BUS_TARGET_INTERFACE                                            \
-        BUS_PROPERTIES_INTERFACE                                        \
-        BUS_PEER_INTERFACE                                              \
-        BUS_INTROSPECTABLE_INTERFACE                                    \
-        "</node>\n"
-
-#define INTERFACES_LIST                              \
-        BUS_UNIT_INTERFACES_LIST                     \
-        "org.freedesktop.systemd1.Target\0"
-
-const char bus_target_interface[] = BUS_TARGET_INTERFACE;
-
-DBusHandlerResult bus_target_message_handler(Unit *u, DBusConnection *c, DBusMessage *message) {
-        const BusBoundProperties bps[] = {
-                { "org.freedesktop.systemd1.Unit", bus_unit_properties, u },
-                { NULL, }
-        };
-
-        SELINUX_UNIT_ACCESS_CHECK(u, c, message, "status");
 
-        return bus_default_message_handler(c, message, INTROSPECTION, INTERFACES_LIST, bps);
-}
+const sd_bus_vtable bus_target_vtable[] = {
+        SD_BUS_VTABLE_START(0),
+        SD_BUS_VTABLE_END
+};