Setup overlay for nixpkgs-unstable

bacon.nix

@@ -1,12 +1,12 @@
-{ inputs, system, pkgs-unstable }: with inputs;
+{ inputs, system, pkgs }: with inputs;
 let
   username = "sigmanificient";
 in
 {
   inherit system;
 
   specialArgs = {
-    inherit username pkgs-unstable;
+    inherit username pkgs;
     hostname = "Bacon";
   };
 

flake.nix

@@ -15,18 +15,29 @@
     };
   };
 
-  outputs = inputs:
-    with inputs; let
+  outputs = { nixpkgs, nixpkgs-unstable, ... } @ inputs:
+    let
       system = "x86_64-linux";
-      pkgs = nixpkgs.legacyPackages.${system};
-      pkgs-unstable = nixpkgs.legacyPackages.${system};
+
+      pkgs-settings = {
+        inherit system;
+        config.allowUnfree = true;
+      };
+
+      pkgs = import nixpkgs (pkgs-settings // {
+        overlays = [
+          (_: _: {
+            unstable = import nixpkgs-unstable pkgs-settings;
+          })
+        ];
+      });
     in
     {
       formatter.${system} = pkgs.nixpkgs-fmt;
 
       nixosConfigurations = {
         Bacon = nixpkgs.lib.nixosSystem
-          (import ./bacon.nix { inherit inputs system pkgs-unstable; });
+          (import ./bacon.nix { inherit inputs system pkgs; });
       };
     };
 }

system/default.nix

@@ -1,4 +1,4 @@
-{ config, username, hostname, pkgs, pkgs-unstable, ... }:
+{ config, username, hostname, pkgs, ... }:
 {
   imports =
     [
@@ -217,7 +217,7 @@
   virtualisation = {
     docker = {
       enable = true;
-      package = pkgs-unstable.docker;
+      package = pkgs.unstable.docker;
     };
 
     libvirtd.enable = true;