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{ pkgs, ... }:
let
  inherit (pkgs) lib;

  tests = {
    # TODO: uncomment stable
    #  - Blocked on https://github.com/NixOS/nixpkgs/issues/138584 which has a
    #    PR in staging: https://github.com/NixOS/nixpkgs/pull/139986
    #  - Alternatively, blocked on a NixOps 2 release
    #    https://github.com/NixOS/nixops/issues/1242
    # stable = testsLegacyNetwork { nixopsPkg = pkgs.nixops; };
    unstable = testsForPackage { nixopsPkg = pkgs.nixops_unstable_minimal; };

    # inherit testsForPackage;
  };

  testsForPackage = args: lib.recurseIntoAttrs {
    legacyNetwork = testLegacyNetwork args;
    passthru.override = args': testsForPackage (args // args');
  };

  testLegacyNetwork = { nixopsPkg, ... }: pkgs.testers.nixosTest ({
    name = "nixops-legacy-network";
    nodes = {
      deployer = { config, lib, nodes, pkgs, ... }: {
        imports = [ ../../modules/installer/cd-dvd/channel.nix ];
        environment.systemPackages = [ nixopsPkg ];
        nix.settings.substituters = lib.mkForce [ ];
        users.users.person.isNormalUser = true;
        virtualisation.writableStore = true;
        virtualisation.additionalPaths = [
          pkgs.hello
          pkgs.figlet
        ];
        virtualisation.memorySize = 2048;

        # TODO: make this efficient, https://github.com/NixOS/nixpkgs/issues/180529
        system.includeBuildDependencies = true;
      };
      server = { lib, ... }: {
        imports = [ ./legacy/base-configuration.nix ];
      };
    };

    testScript = { nodes }:
      let
        deployerSetup = pkgs.writeScript "deployerSetup" ''
          #!${pkgs.runtimeShell}
          set -eux -o pipefail
          cp --no-preserve=mode -r ${./legacy} unicorn
          cp --no-preserve=mode ${../ssh-keys.nix} unicorn/ssh-keys.nix
          mkdir -p ~/.ssh
          cp ${snakeOilPrivateKey} ~/.ssh/id_ed25519
          chmod 0400 ~/.ssh/id_ed25519
        '';
        serverNetworkJSON = pkgs.writeText "server-network.json"
          (builtins.toJSON nodes.server.system.build.networkConfig);
      in
      ''
        import shlex

        def deployer_do(cmd):
            cmd = shlex.quote(cmd)
            return deployer.succeed(f"su person -l -c {cmd} &>/dev/console")

        start_all()

        deployer_do("cat /etc/hosts")

        deployer_do("${deployerSetup}")
        deployer_do("cp ${serverNetworkJSON} unicorn/server-network.json")

        # Establish that ssh works, regardless of nixops
        # Easy way to accept the server host key too.
        server.wait_for_open_port(22)
        deployer.wait_for_unit("network.target")

        # Put newlines on console, to flush the console reader's line buffer
        # in case nixops' last output did not end in a newline, as is the case
        # with a status line (if implemented?)
        deployer.succeed("while sleep 60s; do echo [60s passed]; done >&2 &")

        deployer_do("cd ~/unicorn; ssh -oStrictHostKeyChecking=accept-new root@server echo hi")

        # Create and deploy
        deployer_do("cd ~/unicorn; nixops create")

        deployer_do("cd ~/unicorn; nixops deploy --confirm")

        deployer_do("cd ~/unicorn; nixops ssh server 'hello | figlet'")
      '';
  });

  inherit (import ../ssh-keys.nix pkgs) snakeOilPrivateKey snakeOilPublicKey;

in
tests