Refactor helpers & overlay

helpers.nix

@@ -12,19 +12,12 @@ with inputs.nixpkgs.lib; {
     suite ? "",
     docker ? false,
     hostModules ? [],
-  }: let
-    # System architecture.
+  }:
+    {
+      nixosConfigurations.${hostname} = nixosSystem rec {
+        # Architecture.
         system = platform;
 
-    # Secrets directory.
-    secrets = builtins.toString inputs.secrets;
-
-    # Extra modules to import.
-    extraModules =
-      hostModules # Host-specific modules.
-      ++ optionals (docker == true) [./suites/server/docker] # Enable docker if required.
-      ++ (filesystem.listFilesRecursive ./modules); # Custom modules.
-
         # nixpkgs config.
         pkgs = import nixpkgs {
           inherit system;
@@ -39,37 +32,18 @@ with inputs.nixpkgs.lib; {
             ];
           };
 
-      # Import my overlay.
+          # Import my overlays.
           overlays = [
-        (import ./overlay.nix {inherit inputs system;})
+            (import ./overlay.nix {inherit nixpkgs-unstable nixpkgs-pr-feishin;})
           ];
         };
 
-    # deploy-rs overlay.
-    deployPkgs = import nixpkgs {
-      inherit system;
-      overlays = [
-        deploy-rs.overlays.default
-        (self: super: {
-          deploy-rs = {
-            inherit (pkgs) deploy-rs;
-            lib = super.deploy-rs.lib;
-          };
-        })
-      ];
-    };
-  in
-    {
-      nixosConfigurations.${hostname} = nixosSystem {
-        inherit system pkgs;
-
         specialArgs = {
-          # Make some variables accesible to modules.
-          inherit
-            inputs
-            hostname
-            secrets
-            ;
+          # Pass hostname & inputs to config.
+          inherit inputs hostname;
+
+          # Secrets directory.
+          secrets = builtins.toString inputs.secrets;
         };
 
         modules =
@@ -105,11 +79,26 @@ with inputs.nixpkgs.lib; {
               };
             }
           ]
-          ++ extraModules;
+          ++ hostModules # Host-specific modules.
+          ++ optionals (docker == true) [./suites/server/docker] # Enable docker if required.
+          ++ (filesystem.listFilesRecursive ./modules); # Custom modules.
       };
     }
     // optionalAttrs (strings.hasPrefix "server" suite) {
-      deploy.nodes.${hostname} = {
+      deploy.nodes.${hostname} = let
+        deployPkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            deploy-rs.overlays.default
+            (self: super: {
+              deploy-rs = {
+                inherit (pkgs) deploy-rs;
+                lib = super.deploy-rs.lib;
+              };
+            })
+          ];
+        };
+      in {
         hostname = "${hostname}.local";
         profiles.system = {
           user = "root";

overlay.nix

@@ -1,19 +1,13 @@
 {
-  inputs,
-  system,
+  nixpkgs-unstable,
+  nixpkgs-pr-feishin,
   ...
-}:
-with inputs;
-  final: prev: let
-    pkgsConfig = {
-      inherit system;
-      config.allowUnfree = true;
-    };
-
-    pkgs-unstable = import nixpkgs-unstable pkgsConfig;
-    pkgs-pr-feishin = import nixpkgs-pr-feishin pkgsConfig;
+}: final: prev: let
+  pkgs-unstable = import nixpkgs-unstable {inherit (prev) config system;};
+  pkgs-pr-feishin = import nixpkgs-pr-feishin {inherit (prev) config system;};
 in {
-    # My packages.
+  ## My packages ##
+
   webone = prev.pkgs.callPackage ./packages/webone {}; # WebOne HTTP proxy.
   yazi-flavour-kanagawa-dragon = prev.pkgs.callPackage ./packages/yazi-flavour-kanagawa-dragon {}; # Kanagawa theme for yazi.
   cups-dymo = prev.pkgs.callPackage ./packages/cups-dymo {}; # Dymo label printer drivers.
@@ -37,33 +31,18 @@ with inputs;
 
   ## Unstable channel. ##
 
-    protonmail-desktop = pkgs-unstable.protonmail-desktop; # Protonmail desktop client.
-    rockbox-utility = pkgs-unstable.rockbox-utility; # Rockbox installer.
+  protonmail-desktop = pkgs-unstable.protonmail-desktop;
+  rockbox-utility = pkgs-unstable.rockbox-utility;
 
-    # Fluffychat.
-    fluffychat =
-      (pkgs-unstable
-        // {
-          overlay = [
-            (final: prev: {
-              fluffychat = prev.fluffychat.overrideAttrs (prevAttrs: {
+  fluffychat = pkgs-unstable.fluffychat.overrideAttrs (prevAttrs: {
     desktopItems = [
       ((builtins.elemAt prevAttrs.desktopItems 0).override {startupWMClass = "fluffychat";})
     ];
   });
-            })
-          ];
-        }).fluffychat;
 
   ## Pull requests. ##
 
-    # Feishin music player.
-    feishin =
-      (pkgs-pr-feishin
-        // {
-          overlay = [
-            (final: prev: {
-              feishin = prev.feishin.overrideAttrs (prevAttrs: rec {
+  feishin = pkgs-pr-feishin.feishin.overrideAttrs (prevAttrs: rec {
     pname = "feishin";
     version = "0.18.0";
 
@@ -79,9 +58,6 @@ with inputs;
       hash = "sha256-1MGxrUcfvazxAubaYAsQuulUKm05opWOIC7oaLzjr7o=";
     };
   });
-            })
-          ];
-        }).feishin;
 
   ## Modifications ##