无法创建发布工件目录（拒绝访问路径“ C：\ agent \ _work \ r1 \ a \ NUL”。）

Question

最近，我们在安装了VSTS构建代理的构建代理（运行Windows 2016的两台单独安装的计算机）上遇到了一个烦人的问题。当我们运行del "\\?\%CD%\nul" （请参阅超级用户）时，它会运行几个版本，然后再次出现。

如何以及为什么创建该文件，以及如何确保构建代理不会中断？

下面的堆栈跟踪：

Failed to create Release artifact directory C:\agent\_work\r1\a with an exception
Microsoft.VisualStudio.Services.Agent.Worker.Release.Artifacts.ArtifactDirectoryCreationFailedException: Failed to create Release artifact directory 'C:\agent\_work\r1\a'. ---> System.UnauthorizedAccessException: Access to the path 'C:\agent\_work\r1\a\NUL' is denied.
   at System.IO.Win32FileSystem.DeleteFile(String fullPath)
   at System.IO.FileInfo.Delete()
   at Microsoft.VisualStudio.Services.Agent.Util.IOUtil.c__DisplayClass26_1.b__0(FileSystemInfo item)
   at System.Linq.Parallel.ForAllOperator`1.ForAllEnumerator`1.MoveNext(TInput& currentElement, Int32& currentKey)
   at System.Linq.Parallel.ForAllSpoolingTask`2.SpoolingWork()
   at System.Linq.Parallel.SpoolingTaskBase.Work()
   at System.Linq.Parallel.QueryTask.BaseWork(Object unused)
   at System.Linq.Parallel.QueryTask.RunTaskSynchronously(Object o)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
   --- End of inner exception stack trace ---
   at Microsoft.VisualStudio.Services.Agent.Worker.Release.ReleaseFileSystemManager.EnsureEmptyDirectory(String directoryPath, CancellationToken cancellationToken)
   at Microsoft.VisualStudio.Services.Agent.Worker.Release.RetryExecutor.Execute(Action action). Retrying the creation of Release artifact directory.

Answer 1

在我们的案例中，此问题的原因与构建代理无关。它是我们使用（testcafe）创建文件的测试运行程序的子模块。调用此模块的包装程序将NUL作为日志文件的名称传递给...，并且在下一行未正确处理。