add withConfig for srcds

flake.nix

@@ -45,16 +45,23 @@
         steam-depots = pkgs.steam-depots;
       };
 
-      packages = inheritPkgs [
-        "ambuild"
-        "sourcepawn"
-        "sourcemod"
-        "sourcemod-includes"
-        "sourcemod-include-curl"
-        "sourcemod-include-library"
-        "sourcemod-include-steamworks"
-        "srcds-tf2"
-      ];
+      packages =
+        inheritPkgs [
+          "ambuild"
+          "sourcepawn"
+          "sourcemod"
+          "sourcemod-includes"
+          "sourcemod-include-curl"
+          "sourcemod-include-library"
+          "sourcemod-include-steamworks"
+          "srcds-tf2"
+        ]
+        // {
+          test = pkgs:
+            pkgs.srcds-tf2.withConfig {
+              hostname = "Spire Server";
+            };
+        };
 
       checks = {
         buildTestScript = {pkgs, ...}:

nix/srcds/cfg.nix

@@ -0,0 +1,11 @@
+{
+  lib,
+  cfg,
+  name,
+  writeTextDir,
+}: let
+  inherit (lib) mapAttrsToList concatStringsSep;
+  lines = mapAttrsToList (key: value: ''${key} "${value}"'') cfg;
+  text = concatStringsSep "\n" lines;
+in
+  writeTextDir "tf/cfg/${name}" text

nix/srcds/default.nix

@@ -10,6 +10,8 @@
   curlWithGnuTls,
   steamworks-sdk-redist,
   system,
+  callPackage,
+  srcds-tf2,
 }: let
   inherit (lib) importJSON map toString elem last replaceStrings naturalSort;
   depotInputs = importJSON ./depots.json;
@@ -59,12 +61,28 @@
     }
   );
 
+  makeWithConfig = base: config: let
+    configFile = callPackage ./cfg.nix {
+      name = "server.cfg";
+      cfg = config;
+    };
+    final = symlinkJoin {
+      name = "srcds-tf2-src";
+      paths = [base configFile];
+      passthru = makeWiths final;
+    };
+  in
+    final;
+  makeWiths = base: {
+    withConfig = makeWithConfig base;
+  };
+
   mainProgram =
     if system == "x86_64-linux"
     then "srcds_run_64"
     else "srcds_run";
 in
-  stdenvNoCC.mkDerivation {
+  stdenvNoCC.mkDerivation (finalAttrs: {
     pname = "srcds-tf2";
     version = timeToVersion time;
     inherit src;
@@ -96,6 +114,8 @@ in
       runHook postInstall
     '';
 
+    passthru = makeWiths srcds-tf2;
+
     meta = with lib; {
       inherit mainProgram;
       description = "TF2 dedicated server";
@@ -107,4 +127,4 @@ in
       license = licenses.unfree;
       platforms = ["x86_64-linux" "i686-linux"];
     };
-  }
+  })