gistfile1.txt

[root@hydra:~]# hydra-eval-jobsets client .jobset
...
path is /nix/store/dv867wa31zw373gc2mhjp50hwpizzvs0-git-export
The .jobsets jobset must only have a single job named 'jobsets' at /nix/store/slxivaqskl0c3bllbyyg4vjm7micb0cf-hydra-2017-11-21/bin/.hydra-eval-jobset-wrapped line 634.

[root@hydra:~]# grep pullRequests /nix/store/dv867wa31zw373gc2mhjp50hwpizzvs0-git-export/hydra-jobsets.nix 
, pullRequests
          # (builtins.fromJSON (builtins.readFile pullRequests)));
builtins.trace pullRequests { jobsets = pkgs.writeText "spec.json" (builtins.toJSON jobsetAttrs); }