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
  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 =
        let
          system = c.pkgs.system;

          # Unmodified nixpkgs
          pkgs = import inputs.nixpkgs { inherit system; };

          # nixpkgs with deploy-rs overlay but force the nixpkgs package
          deployPkgs = import inputs.nixpkgs {
            inherit system;
            overlays = [
              inputs.deploy-rs.overlays.default
              (self: super: {
                deploy-rs = {
                  inherit (pkgs) deploy-rs;
                  lib = super.deploy-rs.lib;
                };
              })
            ];
          };
        in
        {
          user = "root";
          path = deployPkgs.deploy-rs.lib.activate.nixos c;
        };
    }) systemConfigurations) extraConfig;
}