chore: formatter, direnv, checker, ci

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Test CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test-flake:
+    name: "Test flake options"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v7
+
+      - name: Lix GHA Installer Action
+        uses: samueldr/lix-gha-installer-action@v2026-06-15
+
+      - name: Check up flake configuration
+        run: nix flake check --system x86_64-linux --show-trace

checks/biosboot/configuration.nix

@@ -0,0 +1,31 @@
+{
+  pkgs,
+  ...
+}:
+{
+  networking.hostName = "snow";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  console.useXkbConfig = true;
+
+  users.users."test" = {
+    isNormalUser = true;
+    description = "test user";
+    extraGroups = [
+      "wheel"
+      "networkmanager"
+    ];
+  };
+
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile.
+  environment.systemPackages = with pkgs; [
+    htop
+  ];
+
+  system.stateVersion = "26.05";
+}

checks/biosboot/default.nix

@@ -0,0 +1,43 @@
+# source: https://discourse.nixos.org/t/nixostest-with-flake-configurations/11542/5
+{
+  inputs,
+  pkgs,
+  ...
+}:
+pkgs.testers.runNixOSTest {
+  name = "Efiboot config test";
+
+  nodes.machine =
+    { ... }:
+    {
+      imports = with inputs.self; [
+        nixosModules.biosboot
+        nixosModules.gnome
+        nixosModules.kernel
+        nixosModules.metadata
+        nixosModules.networking
+        nixosModules.packagemanagers
+        nixosModules.pipewire
+        nixosModules.printing
+        nixosModules.snowflakeos
+        ./configuration.nix
+      ];
+    };
+
+  node = {
+    # since we are using an overlay, we must make pkgs writable
+    pkgsReadOnly = false;
+
+    specialArgs = { inherit inputs; };
+  };
+
+  # disable only when working on testScript
+  skipTypeCheck = true;
+
+  testScript = ''
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+    machine.succeed("uname -a")
+    machine.succeed("echo Modules succesfully tested")
+  '';
+}

checks/efiboot/configuration.nix

@@ -0,0 +1,31 @@
+{
+  pkgs,
+  ...
+}:
+{
+  networking.hostName = "snow";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  console.useXkbConfig = true;
+
+  users.users."test" = {
+    isNormalUser = true;
+    description = "test user";
+    extraGroups = [
+      "wheel"
+      "networkmanager"
+    ];
+  };
+
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+
+  # List packages installed in system profile.
+  environment.systemPackages = with pkgs; [
+    htop
+  ];
+
+  system.stateVersion = "26.05";
+}

checks/efiboot/default.nix

@@ -0,0 +1,43 @@
+# source: https://discourse.nixos.org/t/nixostest-with-flake-configurations/11542/5
+{
+  inputs,
+  pkgs,
+  ...
+}:
+pkgs.testers.runNixOSTest {
+  name = "Efiboot config test";
+
+  nodes.machine =
+    { ... }:
+    {
+      imports = with inputs.self; [
+        nixosModules.efiboot
+        nixosModules.gnome
+        nixosModules.kernel
+        nixosModules.metadata
+        nixosModules.networking
+        nixosModules.packagemanagers
+        nixosModules.pipewire
+        nixosModules.printing
+        nixosModules.snowflakeos
+        ./configuration.nix
+      ];
+    };
+
+  node = {
+    # since we are using an overlay, we must make pkgs writable
+    pkgsReadOnly = false;
+
+    specialArgs = { inherit inputs; };
+  };
+
+  # disable only when working on testScript
+  skipTypeCheck = true;
+
+  testScript = ''
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+    machine.succeed("uname -a")
+    machine.succeed("echo Modules succesfully tested")
+  '';
+}

flake.nix

@@ -25,10 +25,19 @@
     };
   };
 
-  outputs = inputs:
+  outputs =
+    inputs:
     inputs.snowfall-lib.mkFlake {
       inherit inputs;
       channels-config.allowUnfree = true;
       src = ./.;
+
+      # Extra nix flags to set
+      outputs-builder = channels: {
+        formatter = channels.nixpkgs.nixfmt-tree;
+      };
+
+      # Default shell environment
+      alias.shells.default = "default";
     };
 }

modules/nixos/biosboot/default.nix

@@ -1,4 +1,10 @@
-{ options, config, lib, pkgs, ... }:
+{
+  options,
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 with lib;
 let

modules/nixos/efiboot/default.nix

@@ -1,4 +1,10 @@
-{ options, config, lib, pkgs, ... }:
+{
+  options,
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 with lib;
 let
@@ -8,19 +14,21 @@ in
 {
   options.modules.efiboot = with types; {
     bootloader = mkOption {
-      type = enum [ "grub" "systemd-boot" ];
+      type = enum [
+        "grub"
+        "systemd-boot"
+      ];
       default = "systemd-boot";
       description = "The kernel to use for booting.";
     };
   };
 
   config = mkMerge [
-    (mkIf (cfg.bootloader == "systemd-boot")
-      {
-        boot.loader.systemd-boot.enable = true;
-        boot.loader.efi.canTouchEfiVariables = true;
-        boot.loader.systemd-boot.editor = mkDefault false;    
-      })
+    (mkIf (cfg.bootloader == "systemd-boot") {
+      boot.loader.systemd-boot.enable = true;
+      boot.loader.efi.canTouchEfiVariables = true;
+      boot.loader.systemd-boot.editor = mkDefault false;
+    })
     (mkIf (cfg.bootloader == "grub") {
       boot.loader.systemd-boot.enable = false;
       boot.loader.grub.enable = true;
@@ -31,8 +39,9 @@ in
     {
       boot.tmp.cleanOnBoot = mkDefault true;
       # Temporary workaround for "random seed file is world accessible"
-      fileSystems.${efiSysMountPoint}.options =
-        mkIf (config.fileSystems.${efiSysMountPoint}.fsType == "vfat") [ "umask=0077" ];
+      fileSystems.${efiSysMountPoint}.options = mkIf (
+        config.fileSystems.${efiSysMountPoint}.fsType == "vfat"
+      ) [ "umask=0077" ];
     }
   ];
 }

modules/nixos/gnome/default.nix

@@ -1,15 +1,19 @@
-{ options, config, lib, pkgs, ... }:
+{
+  options,
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 with lib;
 let
   cfg = config.modules.gnome;
 in
 {
   options.modules.gnome = with types; {
-    gsconnect.enable =
-      mkEnableOption "Enable KDE Connect integration";
-    removeUtils.enable =
-      mkEnableOption "Remove non-essential GNOME utilities";
+    gsconnect.enable = mkEnableOption "Enable KDE Connect integration";
+    removeUtils.enable = mkEnableOption "Remove non-essential GNOME utilities";
   };
 
   config = {
@@ -33,27 +37,30 @@ in
       enable = true;
     };
 
-    environment.gnome.excludePackages = mkIf cfg.removeUtils.enable (with pkgs.gnome; [
-      baobab
-      cheese
-      eog
-      epiphany
-      file-roller
-      gnome-calculator
-      gnome-calendar
-      gnome-characters
-      gnome-clocks
-      gnome-contacts
-      gnome-font-viewer
-      gnome-logs
-      gnome-maps
-      gnome-music
-      gnome-weather
-      pkgs.gnome-connections
-      pkgs.gnome-photos
-      pkgs.gnome-text-editor
-      simple-scan
-      totem
-    ]);
+    environment.gnome.excludePackages = mkIf cfg.removeUtils.enable (
+      with pkgs.gnome;
+      [
+        baobab
+        cheese
+        eog
+        epiphany
+        file-roller
+        gnome-calculator
+        gnome-calendar
+        gnome-characters
+        gnome-clocks
+        gnome-contacts
+        gnome-font-viewer
+        gnome-logs
+        gnome-maps
+        gnome-music
+        gnome-weather
+        pkgs.gnome-connections
+        pkgs.gnome-photos
+        pkgs.gnome-text-editor
+        simple-scan
+        totem
+      ]
+    );
   };
 }

modules/nixos/kernel/default.nix

@@ -1,4 +1,9 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 with lib;
 {
   config = {

modules/nixos/networking/default.nix

@@ -1,4 +1,9 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 with lib;
 {
   config = {
@@ -7,7 +12,10 @@ with lib;
     # Workaround for https://github.com/NixOS/nixpkgs/issues/180175
     systemd.services.NetworkManager-wait-online = {
       serviceConfig = {
-        ExecStart = [ "" "${pkgs.networkmanager}/bin/nm-online -q" ];
+        ExecStart = [
+          ""
+          "${pkgs.networkmanager}/bin/nm-online -q"
+        ];
       };
     };
   };

modules/nixos/packagemanagers/default.nix

@@ -1,13 +1,18 @@
-{ options, config, lib, pkgs, ... }:
+{
+  options,
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 with lib;
 let
   cfg = config.modules.packagemanagers;
 in
 {
   options.modules.packagemanagers = with types; {
-    appimage.enable =
-      mkEnableOption "Enable AppImage";
+    appimage.enable = mkEnableOption "Enable AppImage";
   };
 
   config = mkIf cfg.appimage.enable {