nixos/tests: nixos-rebuild to remote host with password-based login (#471632)

        system.build.privateKey = snakeOilPrivateKey;

        system.build.publicKey = snakeOilPublicKey;

        system.switch.enable = true;

        services.getty.autologinUser = lib.mkForce "root";

      };

    target =

      deployer.copy_from_host("${configFile "config-1-deployed"}", "/root/configuration-1.nix")

      deployer.copy_from_host("${configFile "config-2-deployed"}", "/root/configuration-2.nix")

      deployer.copy_from_host("${configFile "config-3-deployed"}", "/root/configuration-3.nix")

      deployer.copy_from_host("${targetNetworkJSON}", "/root/target-network.json")

      deployer.copy_from_host("${targetConfigJSON}", "/root/target-configuration.json")

        target_hostname = deployer.succeed("ssh alice@target cat /etc/hostname").rstrip()

        assert target_hostname == "config-2-deployed", f"{target_hostname=}"

      with subtest("Deploy to bob@target with password-based sudo"):

        deployer.wait_for_unit("multi-user.target")

        deployer.send_chars("nixos-rebuild switch -I nixos-config=/root/configuration-3.nix --target-host bob@target --ask-sudo-password\n")

        deployer.wait_until_tty_matches("1", "password for bob")

        deployer.send_chars("${nodes.target.users.users.bob.password}\n")

        deployer.wait_until_tty_matches("1", "Done. The new configuration is /nix/store/.*config-3-deployed")

        target_hostname = deployer.succeed("ssh alice@target cat /etc/hostname").rstrip()

        assert target_hostname == "config-3-deployed", f"{target_hostname=}"

      with subtest("Deploy works with very long TMPDIR"):

        tmp_dir = "/var/folder/veryveryveryveryverylongpathnamethatdoesnotworkwithcontrolpath"

        deployer.succeed(f"mkdir -p {tmp_dir}")