add cancelable status

UpdateManager/UpdateManagerDbus.py

@@ -112,12 +112,16 @@ class UpdateManagerDbusController(dbus.service.Object):
     # 取消transaction 
     @dbus.service.method(INTERFACE, out_signature='bs')
     def CancelDownload(self):
+        status = False
+        message = ""
         try:
             if self.transaction.cancellable == True:
                 self.transaction.cancel()
+                status = True
+                message = "success"
         except Exception as e:
-            return (False,str(e))
-        return (True,"success")
+            return (status,str(e))
+        return (status, message)
     
     #更新进度信息 0~100 进度信息 101为非预期的信号
     @dbus.service.signal(INTERFACE,signature='is')
@@ -142,7 +146,7 @@ class UpdateManagerDbusController(dbus.service.Object):
                     success,upgrade_group, error_string,error_desc)
 
     #发送下载包信息
-    @dbus.service.signal(INTERFACE, signature='iiiiii')
+    @dbus.service.signal(INTERFACE, signature='iiiii')
     def UpdateDownloadInfo(self, current_items, total_items, currenty_bytes, total_bytes, current_cps):
         logging.info("current_items = %d, total_items = %d, currenty_bytes = %d, total_bytes = %d, current_cps = %d .",\
                     current_items, total_items, \