opscode/cookbooks — pull request #320 by pmorton (2012-01-27 18:16:13+00:00)
Title: COOK-988 

Powershell will not exit if stdin is redirected.... Tell powershell to not read stdin.

http://connect.microsoft.com/PowerShell/feedback/details/572313/powershell-exe-can-hang-if-stdin-is-redirected