增加log日志，关机的锁

backend/SystemUpdater/Core/utils.py

@@ -739,9 +739,10 @@ def LockedPreventShutdown():
         try:
             if not locked:
                 fcntl.flock(pidfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
-                logging.info("Has been locked.")
+                logging.info("Shutdown Has been locked...")
                 locked = True
-        except:
+        except Exception as e:
+            logging.error(str(e))
             locked = False
             logging.error("file cannot be locked.")
             return False
@@ -751,13 +752,15 @@ def unLockedEnableShutdown():
     global pidfile
     global locked
     if not pidfile:
+        logging.errr("pidfile file disc is None...")
         return False
     try:
         fcntl.flock(pidfile, fcntl.LOCK_UN)
         pidfile.close()
         locked = False
-        logging.info("Has been unlocked.")
-    except:
+        logging.info("Shutdown Has been unlocked...")
+    except Exception as e:
+        logging.error(str(e))
         logging.error("unlock failed.")
         return False