Given a checked-out Git repository known to Diffusion, how do I find a unique identifier for the repository within Phabricator? Ideally, the repository's callsign, or its PHID.

I used to run arc which and look for the callsign, but recently the output of this command was changed to give the name of the repository instead.

I want this information so that I can feed it into the [[ https://secure.phabricator.com/conduit/method/diffusion.looksoon/ | diffusion.looksoon ]] API method. I would like to create an alias arc looksoon that I could occasionally use.