[Nix-dev] Distributed builds with Hydra

[Peter Simons]

Hi guys,

I recently set up /etc/nix.machines to perform distributed builds. Now,
I notice a curious difference between the behavior of nix-env and Hydra:

 - nix-env dispatches some builds to the remote machine, but runs other
   builds locally.

 - Hydra, on the other hand, seems to perform all builds on the remote
   machines, but none locally.

Is that perception correct? What do I have to do to make Hydra utilize
the local machine for builds, too, like nix-env does?

Take care,
Peter