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, 5 insertions, 3 deletions

diff --git a/src/core/path.h b/src/core/path.h
index dec3df7035..d2e91d7d71 100644
--- a/src/core/path.h
+++ b/src/core/path.h
@@ -46,9 +46,11 @@ typedef enum PathType {
 } PathType;
 
 typedef struct PathSpec {
+        Unit *unit;
+
         char *path;
 
-        Watch watch;
+        sd_event_source *event_source;
 
         LIST_FIELDS(struct PathSpec, spec);
 
@@ -59,8 +61,8 @@ typedef struct PathSpec {
         bool previous_exists;
 } PathSpec;
 
-int path_spec_watch(PathSpec *s, Unit *u);
-void path_spec_unwatch(PathSpec *s, Unit *u);
+int path_spec_watch(PathSpec *s, sd_event_io_handler_t handler);
+void path_spec_unwatch(PathSpec *s);
 int path_spec_fd_event(PathSpec *s, uint32_t events);
 void path_spec_done(PathSpec *s);