修改枷锁方式

backend/SystemUpdater/Core/utils.py

@@ -620,26 +620,30 @@ def get_package_label(pkg):
     name = getattr(pkg.candidate, "summary", "")
     return capitalize_first_word(name)
 
+#安装时禁止关机 进行加锁
 def LockedPreventShutdown():
-        global locked
+    global locked
 
-        if locked:
-            return
+    #加锁后直接返回
+    if locked:
+        return
+    #锁目录是否存在 不存在时 创建
+    if not os.path.exists(FILELOCK_PATH):
+        os.makedirs(FILELOCK_PATH)
 
-        if not os.path.exists(FILELOCK_PATH):
-            os.makedirs(FILELOCK_PATH)
+    with open(os.path.join(FILELOCK_PATH, SHUTDOWN_BLOCK_FILELOCK), "w+") as pidfile:
+        try:
+            fcntl.flock(pidfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
+            locked = True
+            logging.info("Has been locked.")
+        #多次加锁就会出现异常
+        except Exception as e:
+            logging.error(e)
+            locked = False
+            logging.error("file cannot be locked.")
+            return False
 
-        with open(os.path.join(FILELOCK_PATH, SHUTDOWN_BLOCK_FILELOCK), "w+") as pidfile:
-            try:
-                locked = True
-                fcntl.flock(pidfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
-                logging.info("Has been locked.")
-            except Exception as e:
-                logging.error(e)
-                locked = False
-                logging.error("file cannot be locked.")
-                return False
-    
+#解锁禁止关机 
 def unLockedEnableShutdown():
     global locked