update script

python/shell.py

@@ -89,7 +89,13 @@ class Shell:
         print(" ")
 
         commit_id = input("输入commit id: ")
-        os.system("git reset --hard %s"% commit_id)
+
+        command = "%s\n%s" \
+            % (
+                "cd %s" % config['root'],
+                "git reset --hard %s"% commit_id
+            )
+        os.system(command)
         print(" ")