nix-config/pkgs/deployment.nix

{ self, pkgs, lib, boxes }:
let
  # command which generates the update script for that specific machine
  installScript = (target: (pkgs.writeScript "deploy" ''
    #!${pkgs.runtimeShell}
    ssh root@10.13.37.${toString (target + 100)} "ps cax | grep \"nixos-rebuild\" > /dev/null"
    if [ $? -eq 0 ]
    then
        echo "Process is running."
        exit
    else
        echo "Process is not running."
        nix copy --to ssh://root@10.13.37.${toString (target + 100)} ${self}
        ssh root@10.13.37.${toString (target + 100)} -- nixos-rebuild switch --flake ${self}#traffic-stop-box-${toString target}
    fi
  ''));

  # concatanes commands together
  deployBoxes = (systems: lib.strings.concatStringsSep " "
    (builtins.map (system: "${(installScript system)}") systems));

  deployAllScript = (pkgs.writeScript "deploy-all" (
    '' 
              #!${pkgs.runtimeShell} -ex
              ${pkgs.parallel}/bin/parallel --citation
              ${pkgs.parallel}/bin/parallel -j10 ::: ${deployBoxes boxes} || echo "Some deployment failed"
      ''
  ));

  individualScripts = lib.foldl (x: y: lib.mergeAttrs x y) { } (builtins.map (number: { "deploy-box-${toString number}" = (installScript number); }) boxes);

in
({
  deploy-all = deployAllScript;
}) #individualScripts

#in (individualScripts // {
#  deploy-all = deployAllScript;
#})