title: Xcode 8/xcodebuild: how to trigger 'Update Signing' from command line?
body: <p>Background: Xcode 8 has new facilities to 'Automatically Update Signing'. With no provisioning profiles on the building mac, Xcode will automatically pull the required profiles from the Apple dev portal. 
  One can <code>rm -rf ~/Library/MobileDevice/Provisioning\ Profiles</code> then open Xcode project, and Xcode will pull the profiles automatically, one will see 'Update Signing' in Xcode:</p>
  
  <p><a href="https://i.stack.imgur.com/22bmq.png" rel="nofollow"><img src="https://i.stack.imgur.com/22bmq.png" alt="xcode update signing message"></a></p>
  
  <p>How does one trigger this 'Update Signing' from the command-line? The man page for xcodebuild has no mention of this. Simply running an 'xcodebuild' does not run this step.</p>