..

app/controllers/welcome_controller.rb

@@ -150,12 +150,15 @@ class WelcomeController < ApplicationController
         shixun.update_column(:git_url, g.project(shixun.gpid).path_with_namespace)
         local_git_path = local_shixun.local_giturl.split('/').last if local_shixun.local_giturl.present?
         new_giturl = "http://educoder:xinhu1ji2qu3@"+g.project(shixun.gpid).http_url_to_repo.split('//').last
-        system("cd tmp/repositories/#{local_git_path}")
+        if system("cd tmp/repositories/#{local_git_path};")
           system("git remote remove origin")
           system("git remote add origin #{new_giturl}")
           system("git add .")
           system("git commit -m '..'")
           system("git push origin master")
+        end
+
+        #  http://Hjqreturn:xinhu1ji2qu3@bdgit.educoder.net/Hjqreturn/pgfqe6ch8.git (fetch)
 
         # 同步关卡信息
         local_challenges = LocalChallenge.where(local_shixun_id: local_shixun.id)