os/lib/deploy.nix

/*
* The contents of this file are adapted from digga
* https://github.com/divnix/digga
*
* Licensed under the MIT license
*/
{
  lib,
  inputs,
}: let
  # https://github.com/serokell/deploy-rs#overall-usage
  system = "x86_64-linux";
  pkgs = import inputs.nixpkgs { inherit system; };
  deployPkgs = import inputs.nixpkgs {
    inherit system;
    overlays = [
      inputs.deploy-rs.overlay
      (self: super: { deploy-rs = { inherit (pkgs) deploy-rs; lib = super.deploy-rs.lib; }; })
    ];
  };
  getFqdn = c: let
    net = c.config.networking;
    fqdn =
      if (net ? domain) && (net.domain != null)
      then "${net.hostName}.${net.domain}"
      else net.hostName;
  in
    fqdn;
in {
  mkDeployNodes = systemConfigurations: extraConfig:
  /*
   *
   Synopsis: mkNodes _systemConfigurations_ _extraConfig_

   Generate the `nodes` attribute expected by deploy-rs
   where _systemConfigurations_ are `nodes`.

   _systemConfigurations_ should take the form of a flake's
   _nixosConfigurations_. Note that deploy-rs does not currently support
   deploying to darwin hosts.

   _extraConfig_, if specified, will be merged into each of the
   nodes' configurations.

   Example _systemConfigurations_ input:

   ```
   {
   hostname-1 = {
   fastConnection = true;
   sshOpts = [ "-p" "25" ];
   };
   hostname-2 = {
   sshOpts = [ "-p" "19999" ];
   sshUser = "root";
   };
   }
   ```
   *
   */
    lib.recursiveUpdate
    (lib.mapAttrs
      (
        _: c: {
          hostname = getFqdn c;
          profiles.system = {
            user = "root";
            path = deployPkgs.deploy-rs.lib.activate.nixos c;
          };
        }
      )
      systemConfigurations)
    extraConfig;
}