core: dbus: track bus names per unit

Currently, PID1 installs an unfiltered NameOwnerChanged signal match, and
dispatches the signals itself. This does not scale, as right now, PID1
wakes up every time a bus client connects.

To fix this, install individual matches once they are requested by
unit_watch_bus_name(), and remove the watches again through their slot in
unit_unwatch_bus_name().

If the bus is not available during unit_watch_bus_name(), just store
name in the 'watch_bus' hashmap, and let bus_setup_api() do the installing
later.

1 files changed, 0 insertions, 18 deletions

diff --git a/src/core/manager.c b/src/core/manager.c
index ba107d4615..ecea89c377 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -2187,24 +2187,6 @@ void manager_send_unit_plymouth(Manager *m, Unit *u) {
                         log_error_errno(errno, "Failed to write Plymouth message: %m");
 }
 
-void manager_dispatch_bus_name_owner_changed(
-                Manager *m,
-                const char *name,
-                const char* old_owner,
-                const char *new_owner) {
-
-        Unit *u;
-
-        assert(m);
-        assert(name);
-
-        u = hashmap_get(m->watch_bus, name);
-        if (!u)
-                return;
-
-        UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner);
-}
-
 int manager_open_serialization(Manager *m, FILE **_f) {
         const char *path;
         int fd = -1;