Trying to fix flake

flake.nix

@@ -8,87 +8,37 @@
   outputs = {
     self,
     nixpkgs,
+    nix,
   }: let
     # System types to support.
     supportedSystems = ["x86_64-linux"];
 
     # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
-    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    forEachSystem = nixpkgs.lib.genAttrs supportedSystems;
+
+    # Package overlays to include
+    overlayList = [self.overlays.default];
 
     # Nixpkgs instantiated for supported system types.
-    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
+    pkgsBySystem = forEachSystem (system:
+      import nixpkgs {
+        inherit system;
+        overlays = overlayList;
+      });
 
     version = "0.0.1";
     pname = "oott";
-  in {
+  in rec {
     # A Nixpkgs overlay that provides a 'oott' package.
-    overlays.default = final: prev: {oott = final.callPackage self {};};
+    overlays.default = final: prev: {oott = final.callPackage ./package.nix {};};
 
     # Package definition
-    packages = forAllSystems (system: let
+    packages = forEachSystem (system: {
-      pkgs = nixpkgsFor.${system};
+      ${pname} = pkgsBySystem.${system}.${pname};
-    in {
+      default = pkgsBySystem.${system}.${pname};
-      ${pname} = pkgs.rustPlatform.buildRustPackage rec {
-        inherit pname;
-        inherit version;
-        src = ./.;
-        cargoLock = {
-          lockFile = ./Cargo.lock;
-        };
-
-        nativeBuildInputs = [pkgs.pkg-config];
-        PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
-      };
     });
 
-    # Module definition
+    # Modules definition
-    nixosModules = forAllSystems (system: let
+    nixosModules = import ./modules.nix {overlays = overlayList;};
-      pkgs = nixpkgsFor.${system};
-    in
-      {
-        config,
-        lib,
-        pkgs,
-        ...
-      }:
-        with lib; let
-          cfg = config.services.oott;
-        in {
-          options.services.oott = {
-            enable = mkEnableOption "Enable oott as a service";
-
-            package = mkOption {
-              type = types.package;
-              default = self.packages.${system}.oott;
-              description = "oott package to use";
-            };
-            networking.interface = mkOption {
-              type = types.str;
-              description = "Network interface to use for scans";
-              default = "eno1";
-            };
-            log.level = mkOption {
-              type = types.str;
-              description = "Log level for the oott service";
-              default = "info";
-            };
-          };
-          config = mkIf cfg.enable {
-            systemd.services.oott = {
-              description = "oott - network device scanner";
-              wantedBy = ["multi-user.target"];
-
-              serviceConfig = {
-                ExecStart = "${cfg.package}/bin/oott ${
-                  builtins.toFile "oott.toml"
-                  (generators.toTOML {} cfg)
-                }";
-                ProtectHome = "read-only";
-                Restart = "on-failure";
-                Type = "exec";
-              };
-            };
-          };
-        });
   };
 }

modules.nix

@@ -0,0 +1,9 @@
+{overlays}: {
+  simple-go-server = import ./oott-service.nix;
+
+  overlayNixpkgsForThisInstance = {pkgs, ...}: {
+    nixpkgs = {
+      inherit overlays;
+    };
+  };
+}

oott-service.nix

@@ -0,0 +1,49 @@
+{
+  config,
+  pkgs,
+  lib ? pkgs.lib,
+  ...
+}:
+with lib; let
+  cfg = config.services.oott;
+in {
+  # Service options
+  options.services.oott = {
+    enable = mkEnableOption "Enable oott as a service";
+
+    package = mkOption {
+      type = types.package;
+      default = self.packages.${system}.oott;
+      description = "oott package to use";
+    };
+    networking.interface = mkOption {
+      type = types.str;
+      description = "Network interface to use for scans";
+      default = "eno1";
+    };
+    log.level = mkOption {
+      type = types.str;
+      description = "Log level for the oott service";
+      default = "info";
+    };
+  };
+
+  # Service implementation
+  config = mkIf cfg.enable {
+    environment.systemPackages = [pkgs.oott];
+    systemd.services.oott = {
+      description = "oott - network device scanner";
+      wantedBy = ["multi-user.target"];
+
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/oott ${
+          builtins.toFile "oott.toml"
+          (generators.toTOML {} cfg)
+        }";
+        ProtectHome = "read-only";
+        Restart = "on-failure";
+        Type = "exec";
+      };
+    };
+  };
+}

package.nix

@@ -0,0 +1,17 @@
+{
+  pkgs,
+  buildRustPackage,
+  pname,
+  version,
+}:
+buildRustPackage rec {
+  inherit pname;
+  inherit version;
+  src = ./.;
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
+
+  nativeBuildInputs = [pkgs.pkg-config];
+  PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
+}