Create a workspace from Powershell run within VS T

Question

I am writing a Powershell script as part of a Visual Studio Team Services build, this build uses a hosted build controller. The script is intended to check out a file, make changes then check it back in.

In the script I am trying to invoke the tf command to create a new workspace but I'm having authentication issues. The command

& $tf vc workspace /new $tempWorkspaceName /collection:https://mycollection.visualstudio.com/ 

produces the error:

TF30063: You are not authorized to access https://mycollection.visualstudio.com/.

How can I access TFS from my Powershell script without embedding logins or passwords in the script? Can I access TFS within the context of the build agent, which itself logs in to TFS? Or is there another way I should be doing this?

Note that I haven't used the TFS Power Tool cmdlets as it is a hosted build server. Using the TFS RestAPI also doesn't appear to be an option as there is no facility to check a file in or out.

Answer 1

1. Check Allow Scripts to Access OAuth Token option of your build defition
2. Append /noprompt /loginType:OAuth /login:.,$(System.AccessToken) to your TF command (arguments)

About TF Command, you can check this article.