core: track scope controllers on the bus

This watches controllers on the bus, and unsets them automatically when
they disappear.

Note that this is primarily a cosmetical fix. Since unique bus names are not
recycled, there's strictly no need to forget about them, but it's a lot
nicer to do so.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/core/scope.h b/src/core/scope.h
index 7e8c47dd42..ca7c6c868f 100644
--- a/src/core/scope.h
+++ b/src/core/scope.h
@@ -46,6 +46,8 @@ struct Scope {
         usec_t timeout_stop_usec;
 
         char *controller;
+        sd_bus_track *controller_track;
+
         bool was_abandoned;
 
         sd_event_source *timer_event_source;