nix: simplified codex service definition

configObject option is used to define the configuration which is then
dumped to a toml file and is used as input to codex
binary(conditionally).

Signed-off-by: markoburcul <marko@status.im>

flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "Codex build flake";
+  description = "Nim Codex build flake";
   
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
@@ -26,18 +26,40 @@
         };
         build = targets: buildTarget.override { inherit targets; };
       in rec {
-        codex   = build ["all"];
-        default = codex;
+        nim-codex   = build ["all"];
+        default = nim-codex;
       });
 
-      nixosModules.codex = import ./nix/codex.nix;
+      nixosModules.nim-codex = import ./nix/service.nix;
+
+      checks = forAllSystems (system: let
+        pkgs = pkgsFor.${system};
+      in {
+        nim-codex-test = pkgs.nixosTest {
+          name = "nim-codex-test";
+          nodes = {
+            server = { config, pkgs, ... }: {
+              imports = [ self.nixosModules.nim-codex ];
+              services.nim-codex.enable = true;
+              services.nim-codex.dataDir = "/var/lib/nim-codex-test";
+            };
+          };
+          testScript = ''
+            print("Starting test: nim-codex-test")
+            machine.start()
+            machine.wait_for_unit("nim-codex.service")
+            machine.succeed("test -d /var/lib/nim-codex-test")
+            machine.wait_until_succeeds("journalctl -u nim-codex.service | grep 'Started codex node'", 10)
+          '';
+        };
+      });
 
       devShells = forAllSystems (system: let
         pkgs = pkgsFor.${system};
       in {
         default = pkgs.mkShell {
           inputsFrom = [
-            packages.${system}.codex
+            packages.${system}.nim-codex
             circom-compat.packages.${system}.default
           ];
           # Not using buildInputs to override fakeGit and fakeCargo.

nix/default.nix

@@ -25,11 +25,17 @@ let
   tools = callPackage ./tools.nix {};
 in pkgs.gcc11Stdenv.mkDerivation rec {
   
-  pname = "codex";
+  pname = "nim-codex";
 
   version = "${tools.findKeyValue "version = \"([0-9]+\.[0-9]+\.[0-9]+)\"" ../codex.nimble}-${revision}";
   
-  inherit src;
+  src = pkgs.fetchFromGitHub {
+    owner = "codex-storage";
+    repo = "nim-codex";
+    rev = "HEAD";
+    sha256 = "sha256-cPQDV46Z9z27Hd32eW726fC3J1dAhXyljbhAgFXVEXQ=";
+    fetchSubmodules = true;
+  };
 
   # Dependencies that should exist in the runtime environment.
   buildInputs = with pkgs; [
@@ -76,7 +82,7 @@ in pkgs.gcc11Stdenv.mkDerivation rec {
   '';
 
   meta = with pkgs.lib; {
-    description = "Codex storage system";
+    description = "Nim Codex storage system";
     homepage = "https://github.com/codex-storage/nim-codex";
     license = licenses.mit;
     platforms = stableSystems;

nix/service.nix

@@ -6,27 +6,21 @@ let
   
   toml = pkgs.formats.toml { };
 
-  cfg = config.services.codex;
+  cfg = config.services.nim-codex;
 in
 {
   options = {
-    services.codex = {
-      enable = mkEnableOption "Codex Node service.";
+    services.nim-codex = {
+      enable = mkEnableOption "Nim Codex Node service.";
 
       package = mkOption {
         type = types.package;
         default = pkgs.callPackage ./default.nix { };
-        defaultText = literalExpression "pkgs.codex";
-        description = lib.mdDoc "Package to use as Codex node.";
+        defaultText = literalExpression "pkgs.nim-codex";
+        description = lib.mdDoc "Package to use as Nim Codex node.";
       };
 
-      configFile = mkOption {
-        type = types.nullOr types.str;
-        default = null;
-        description = "Path to the Codex configuration file.";
-      };
-
-      configObject = lib.mkOption {
+      settings = lib.mkOption {
         default = { };
         type = toml.type;
         description = ''Structured settings object that will be used to generate a TOML config file.'';
@@ -36,10 +30,10 @@ in
 
   config = mkIf cfg.enable {
     environment.etc = {
-      "codex/config.toml".source = toml.generate "config.toml" cfg.configObject;
+      "nim-codex/config.toml".source = toml.generate "config.toml" cfg.settings;
     };
-    systemd.services.codex = {
-      description = "Codex Node";
+    systemd.services.nim-codex = {
+      description = "Nim Codex Node";
       wantedBy = [ "multi-user.target" ];
       requires = [ "network.target" ];
       serviceConfig = {
@@ -50,9 +44,13 @@ in
         NoNewPrivileges = true;
         PrivateDevices = true;
         MemoryDenyWriteExecute = true;
-        ExecStart = ''${cfg.package}/bin/codex --config-file=${if cfg.configFile != null then cfg.configFile else "/etc/codex/config.toml"}'';
+        ExecStart = "${cfg.package}/bin/nim-codex --config-file=/etc/nim-codex/config.toml";
         Restart = "on-failure";
       };
+      restartIfChanged = true;
+      restartTriggers = [
+        "/etc/nim-codex/config.toml"
+      ];
     };
   };
 }