升级到High sierra后Jenkins不启动

如果没有jenkins用户，需要用jenkins用户登录一下。如果登录界面也没有，需要自己手动创建一个。

1. Stop the jenkins server：
   sudo launchctl unload /Library/LaunchDaemons/org.jenkins-ci.plist

2. Add execute permissions to org.jenkins-ci.plist:
   sudo chmod +x /Library/LaunchDaemons/org.jenkins-ci.plist

3. Set jenkins as the owner of /var/log/jenkins:
   sudo chown jenkins /var/log/jenkins

4. Start Jenkins:
   sudo launchctl load /Library/LaunchDaemons/org.jenkins-ci.plist

此步骤可能需要执行：
sudo chown -R jenkins /Users/Shared/Jenkins

有可能会出现git访问权限问题，需要设置ssh中文件权限：
sudo chown jenkins *
sudo chmod 600 *