nixpkgs/nixos/tests/nix-serve-ssh.nix

import ./make-test-python.nix ({ pkgs, lib, ... }:
let inherit (import ./ssh-keys.nix pkgs)
      snakeOilPrivateKey snakeOilPublicKey;
    ssh-config = builtins.toFile "ssh.conf" ''
      UserKnownHostsFile=/dev/null
      StrictHostKeyChecking=no
    '';
in
   { name = "nix-ssh-serve";
     meta.maintainers = [ lib.maintainers.shlevy ];
     nodes =
       { server.nix.sshServe =
           { enable = true;
             keys = [ snakeOilPublicKey ];
             protocol = "ssh-ng";
           };
         server.nix.package = pkgs.nix;
         client.nix.package = pkgs.nix;
       };
     testScript = ''
       start_all()

       client.succeed("mkdir -m 700 /root/.ssh")
       client.succeed(
           "cat ${ssh-config} > /root/.ssh/config"
       )
       client.succeed(
           "cat ${snakeOilPrivateKey} > /root/.ssh/id_ecdsa"
       )
       client.succeed("chmod 600 /root/.ssh/id_ecdsa")

       client.succeed("nix-store --add /etc/machine-id > mach-id-path")

       server.wait_for_unit("sshd")

       client.fail("diff /root/other-store$(cat mach-id-path) /etc/machine-id")
       # Currently due to shared store this is a noop :(
       client.succeed("nix copy --experimental-features 'nix-command' --to ssh-ng://nix-ssh@server $(cat mach-id-path)")
       client.succeed(
           "nix-store --realise $(cat mach-id-path) --store /root/other-store --substituters ssh-ng://nix-ssh@server"
       )
       client.succeed("diff /root/other-store$(cat mach-id-path) /etc/machine-id")
     '';
   }
)