利用TFS2015的跨平台生成代理，在mac osx 上生成xamarin.ios项目，agent费劲九牛二虎之力搞定了（参见），发起生成任务却死活无法获取源码版本，

错误如下：

2016-09-02T08:13:24.186Z: preparing Workspace 2016-09-02T08:13:24.187Z: cwd: /Users/owner/myagent/_work 2016-09-02T08:13:24.188Z: Repository type: TfsGit 2016-09-02T08:13:24.188Z: using source provider: tfsgit 2016-09-02T08:13:24.188Z: loading: /Users/owner/myagent/agent/scm/tfsgit 2016-09-02T08:13:24.194Z: Using auth scheme: OAuth 2016-09-02T08:13:24.199Z: running incremental 2016-09-02T08:13:24.199Z: getting code 2016-09-02T08:13:24.200Z: http://tfs2013-tfs:8080/tfs/DefaultCollection/_git/GitMobileApps 2016-09-02T08:13:24.200Z: srcVersion: 4d93b485cfef047e3418760345bc953139a0230e 2016-09-02T08:13:24.200Z: srcBranch: refs/heads/master 2016-09-02T08:13:24.200Z: Using ref: 4d93b485cfef047e3418760345bc953139a0230e 2016-09-02T08:13:24.208Z: Cloning into 's'... 2016-09-02T08:13:24.209Z:  2016-09-02T08:13:24.242Z: fatal: Authentication failed for 'http://OAuth:********@tfs2013-tfs:8080/tfs/DefaultCollection/_git/GitMobileApps/' 2016-09-02T08:13:24.242Z:  ##[Error] 2016-09-02T08:13:24.247Z: /usr/bin/git failed with return code: 128

经过bing搜索，找到了下面的老外的解决办法：

try setting envvar（解决办法，在tfs的生成定义中，添加这2个变量，并填写正确的账号密码,如：esp\tfscompile域账号）

VSO_GIT_USERNAME

VSO_GIT_PASSWORD

原文： 感谢他们！