infra/nix/os/devices/hydra.json

{
  "enabled": 1,
  "hidden": false,
  "description": "Jobsets",
  "nixexprinput": "src",
  "nixexprpath": "default.nix",
  "checkinterval": 300,
  "schedulingshares": 100,
  "enableemail": false,
  "emailoverride": "",
  "keepnr": 3,
  "inputs": {
    "src": {
      "type": "git",
      "value": "git://github.com/shlevy/declarative-hydra-example.git",
      "emailresponsible": false
    },
    "nixpkgs": {
      "type": "git",
      "value": "git://github.com/NixOS/nixpkgs.git release-16.03",
      "emailresponsible": false
    }
  }
}