let
  pkgs = import (builtins.fetchGit {
    name = "pinned-nixpkgs-21.11";                                                 
    url = "https://github.com/NixOS/nixpkgs/";                       
    ref = "refs/heads/nixos-21.11";                     
    rev = "860b56be91fb874d48e23a950815969a7b832fbc";                                           
  }) {};                                                                           

  # TODO: This is where I'd put our IPFS plugin (if we had one!!)
  ipfs = pkgs.ipfs;

  # CID representing the SWHID
  # https://archive.softwareheritage.org/browse/snapshot/c7c108084bc0bf3d81436bf980b46e98bd338453/directory/
  # (no particular attachment to darkroom, it was just the example
  # snapshot from the SWHID docs)
  swhid_cid = "znDfqECWqk8VqwNL2ayyYnvJdwDN9qYqa2";

  # CID pointing to GNU Hello on Git (taken from the Nix-IPFS
  # integration docs)
  known_good_cid = "baf4bcfgi2up65zpzhg2fmyi52kecqfhsaevbaha";
in

  pkgs.nixosTest {
    system = "x86_64-linux";
    machine = { config, pkgs, ... }: {
      networking.firewall.enable = false;
      services.ipfs = {
        enable = true;
        apiAddress = "/ip4/127.0.0.1/tcp/2324";
      };
    };
    skipLint = true;

    # TODO: Add bridge node (when we have a bridge)
    testScript = ''
      import json
      import sys

      machine.wait_for_unit('ipfs')
      print(machine.wait_until_succeeds('ipfs swarm peers | grep ip4'))

      machine.succeed(
        'ipfs --api /ip4/127.0.0.1/tcp/2324 dag get "${known_good_cid}"'
      )

      # Hangs forever because IPFS doesn't understand our CID
      machine.fail(
        'timeout 5 ipfs dag get ${swhid_cid}'
      )
    '';
  }