tetragon: Add sensor PostLoadHook hook

Signed-off-by: Jiri Olsa <jolsa@kernel.org>

pkg/sensors/load.go

@@ -115,6 +115,11 @@ func (s *Sensor) Load(bpfDir, mapDir string) error {
 		p.LoadState.RefInc()
 		l.WithField("prog", p.Name).WithField("label", p.Label).Debugf("BPF prog was loaded")
 	}
+	if s.PostLoadHook != nil {
+		if err := s.PostLoadHook(); err != nil {
+			logger.GetLogger().WithError(err).WithField("sensor", s.Name).Warn("Post load hook failed")
+		}
+	}
 	l.WithField("sensor", s.Name).Infof("Loaded BPF maps and events for sensor successfully")
 	s.Loaded = true
 	return nil

pkg/sensors/sensors.go

@@ -43,6 +43,8 @@ type Sensor struct {
 	Loaded bool
 	// Destroyed indicates whether the sensor had been destroyed.
 	Destroyed bool
+	// PostLoadHook hook
+	PostLoadHook SensorHook
 	// PreUnloadHook can optionally contain a pointer to a function to be
 	// called during sensor unloading, prior to the programs and maps being
 	// unloaded.