nix: modernize

flake.lock

@@ -2,15 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1705003311,
-        "narHash": "sha256-7JtTAgeUHGKA9phwPveHtwvaQCDrta1yR5t7MYSMcCU=",
+        "lastModified": 1736012469,
+        "narHash": "sha256-/qlNWm/IEVVH7GfgAIyP6EsVZI6zjAx1cV5zNyrs+rI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3680fef792863c8b7bf52f0d474a16319995eabd",
+        "rev": "8f3e1f807051e32d8c95cd12b9b421623850a34d",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,6 +1,6 @@
 {
   description = "Batmon - battery monitor";
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
   outputs = {
     self,
@@ -11,7 +11,8 @@
     pkgsForEach = nixpkgs.legacyPackages;
   in {
     nixosModules = {
-      batmon = ./nix/module.nix {inherit self;};
+      batmon = import ./nix/module.nix self;
+      default = self.nixosModules.batmon;
     };
 
     packages = forEachSystem (system: {

nix/module.nix

@@ -1,13 +1,14 @@
-{
-  self,
+self: {
   config,
   pkgs,
   lib,
   ...
 }: let
-  inherit (lib) mkIf mkForce types;
+  inherit (lib.modules) mkIf mkForce;
   inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib) types;
 
+  format = pkgs.formats.json {};
   cfg = config.services.batmon;
 in {
   options.services.batmon = {
@@ -20,25 +21,26 @@ in {
     };
 
     settings = mkOption {
-      description = "Settings for Batmon";
-      type = types.attrs;
+      type = format.type;
       default = {};
-      example = lib.literalExpression ''
-        {
+      example = {
         batPaths = [
           {
             path = "/sys/class/power_supply/BAT0";
             extraCommand = "notify-send 'State changed!'";
           }
         ];
-        }
-      '';
+      };
+
+      description = "Settings for BatmoSettings for Batmonn";
     };
   };
 
   config = mkIf cfg.enable {
     systemd.user.services."batmon" = {
       description = "Power Monitoring Service";
+      wants = ["power-profiles-daemon.service"];
+      wantedBy = ["default.target"];
       environment.PATH = mkForce "/run/wrappers/bin:${lib.makeBinPath cfg.package}";
       script = ''
         ${lib.getExe cfg.package} --config ${builtins.toJSON cfg.settings}
@@ -47,10 +49,8 @@ in {
       serviceConfig = {
         Type = "simple";
         Restart = "on-failure";
+        DynamicUser = true;
       };
-
-      wants = ["power-profiles-daemon.service"];
-      wantedBy = ["default.target"];
     };
   };
 }

nix/package.nix

@@ -1,11 +1,22 @@
-{buildGoModule}:
+{
+  lib,
+  buildGoModule,
+}:
 buildGoModule {
   pname = "Batmon";
   version = "0.1.0";
 
-  src = ../.;
+  src = builtins.path {
+    path = ../.;
+    name = "batmon-src";
+  };
 
   vendorHash = null;
-
   ldflags = ["-s" "-w"];
+
+  meta = {
+    license = lib.licenses.gpl3Only;
+    maintainers = [lib.maintainers.NotAShelf];
+    mainProgram = "batmon";
+  };
 }

nix/shell.nix

@@ -1,16 +1,12 @@
 {
-  packagePath,
-  callPackage,
+  mkShellNoCC,
   gopls,
   go,
-}: let
-  mainPkg = callPackage packagePath {};
-in
-  mainPkg.overrideAttrs (oa: {
-    nativeBuildInputs =
-      (oa.nativeBuildInputs or [])
-      ++ [
+}:
+mkShellNoCC {
+  name = "batmon";
+  packages = [
     gopls
     go
   ];
-  })
+}