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, 2 insertions, 1 deletions

diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
index 0f25e2306f..7e6f6109dc 100644
--- a/src/login/logind-dbus.c
+++ b/src/login/logind-dbus.c
@@ -40,6 +40,7 @@
 #include "bus-util.h"
 #include "bus-error.h"
 #include "logind.h"
+#include "bus-errors.h"
 
 static int property_get_idle_hint(
                 sd_bus *bus,
@@ -184,7 +185,7 @@ static int method_get_session_by_pid(sd_bus *bus, sd_bus_message *message, void
 
         p = session_bus_path(session);
         if (!p)
-                return sd_bus_reply_method_errno(bus, message, -ENOMEM, NULL);
+                return sd_bus_reply_method_errno(bus, message, ENOMEM, NULL);
 
         return sd_bus_reply_method_return(bus, message, "o", p);
 }