NixOSConfig/flake.nix

{
  description = "NixOS Machine Configurations by manuth";

  inputs = {
    nixpkgs.url = "nixpkgs/38c01297e7ec11f7b9e3f2cae7d6fcec6cc767ec";
    flake-utils.url = "github:numtide/flake-utils?ref=b1d9ab70662946ef0850d488da1c9019f3a9752a";

    home-manager = {
      url = "github:nix-community/home-manager?ref=6e277d9566de9976f47228dd8c580b97488734d4";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    sops-nix.url = "github:Mic92/sops-nix?ref=f1b0adc27265274e3b0c9b872a8f476a098679bd";
  };

  outputs = { self, nixpkgs, flake-utils, home-manager, sops-nix }: (
    let
      inherit (nixpkgs) lib;

      defaultMachine = {
        system = "x86_64-linux";

        config = { pkgs, ... }: {
          dualBoot = false;
          timeZone = null;
          keyMap = "us";
          keyboardLayout = "us";
          localeSettings = { };
          users = { };
        };
      };

      machineDefinitions = {
        nixos.config = { ... }: {
        };
      };

      machines = builtins.mapAttrs (
        name: machineDefinition:
          defaultMachine // machineDefinition // {
            config = { callPackage, ... }:
              ((callPackage defaultMachine.config { }) // (callPackage machineDefinition.config { }));
          })
        machineDefinitions;

      tryFiles = import ./lib/utils/try-files.nix { inherit lib; };
    in
      flake-utils.lib.eachDefaultSystem (
        system:
          let
            pkgs = import nixpkgs {
              inherit system;
              config = {};

              overlays = [
                sops-nix.overlays.default
              ];
            };
          in {
            devShells.default = pkgs.mkShellNoCC (
              with pkgs;
              {
                sopsPGPKeyDirs = [ 
                  "${toString ./.}/keys/hosts"
                  "${toString ./.}/keys/users"
                ];

                packages = [
                  nixos-rebuild
                  sops
                  sops-import-keys-hook
                  ssh-to-age
                  ssh-to-pgp
                ];

                nativeBuildInputs = [
                  sops-import-keys-hook
                ];
              });
          }
      ) // {
        nixosConfigurations =
            builtins.mapAttrs (
              hostname: { system, config }@machine: nixpkgs.lib.nixosSystem {
                inherit system;

                modules = [
                  (
                    { pkgs, ... }: {
                      config = {
                        _module.args = {
                          machine = machine // {
                            name = hostname;
                            config = (pkgs.callPackage config { });
                          };
                        };

                        home-manager.sharedModules = [
                          sops-nix.homeManagerModules.sops
                        ];
                      };
                    })
                  home-manager.nixosModules.home-manager
                  sops-nix.nixosModules.sops
                  ./lib/configuration.nix
                  (tryFiles [ ./lib/machines/${hostname}.nix ] ./lib/hardware/base.nix)
                ];
              })
              machines;

        homeConfigurations =
          let
            lib = nixpkgs.lib;
          in
            lib.attrsets.concatMapAttrs (
              hostname: machine:
                let
                  pkgs = import nixpkgs {
                    inherit (machine) system;
                  };

                  machineConfig = pkgs.callPackage machine.config { };
                in
                  lib.attrsets.concatMapAttrs (
                    username: user: {
                      "${username}@${hostname}" = home-manager.lib.homeManagerConfiguration {
                        modules =
                          let
                            getUserConfig = pkgs.callPackage (import ./lib/utils/user-config.nix);
                            userConfigPath = getUserConfig { inherit hostname username; };
                          in [
                            (
                              { pkgs, ... }: {
                                config._module.args = {
                                  machine = machine // {
                                    name = hostname;
                                    config = machineConfig;
                                  };

                                  user = {
                                    name = username;
                                  } // user;
                                };
                              })
                            sops-nix.homeManagerModules.sops
                          ] ++ (lib.optional (userConfigPath != null) userConfigPath);
                      };
                    })
                  machineConfig.users)
              machines;
      });
}