nixos-servers/flake-parts/deploy.nix

{ self, pkgs, machines, deploy-rs, ... }:
let
  mkDeployNodes = nodeDef:
    builtins.mapAttrs
      (name: machine: nodeDef name machine)
      machines;
in
{
  deploy = {
    sshUser = "root";
    user = "root";

    nodes = mkDeployNodes (name: machine:
      let
        nixosConfiguration = self.nixosConfigurations.${name};
      in
      {
        hostname = nixosConfiguration.config.networking.fqdn;
        profiles.system = {
          remoteBuild = machine.arch != pkgs.stdenv.hostPlatform.system;
          path = deploy-rs.lib.${machine.arch}.activate.nixos nixosConfiguration;
        };
      });
  };
}