Fix Frigate stuck at finishing when restarting from UI (#5216)

frigate/util.py

@@ -628,8 +628,13 @@ def clipped(obj, frame_shape):
 
 
 def restart_frigate():
-    # S6 overlay is configured to exit once the Frigate process exits
-    os.kill(os.getpid(), signal.SIGTERM)
+    proc = psutil.Process(1)
+    # if this is running via s6, sigterm pid 1
+    if proc.name() == "s6-svscan":
+        proc.terminate()
+    # otherwise, just try and exit frigate
+    else:
+        os.kill(os.getpid(), signal.SIGTERM)
 
 
 class EventsPerSecond: