feat: add flexible parameter override system with JSON configuration

- Add support for overriding claudeHash, claudeVersion, and claudeUrl via JSON input
- Consolidate parameters into single claude-params input file
- Maintain single source of truth for defaults in package definition
- Support fallback to defaults when no parameters provided
- Enable easy local customization without upstream dependency

Author: raumfisch

flake.lock

@@ -4,12 +4,20 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    
+    # Claude parameters file - JSON with hash, version, and url
+    # Override with: inputs.claude-desktop.inputs.claude-params.url = "file+file:///path/to/params.json";
+    claude-params = {
+      url = "file+file:///dev/null";
+      flake = false;
+    };
   };
 
   outputs = {
     self,
     nixpkgs,
     flake-utils,
+    claude-params,
   }:
     flake-utils.lib.eachSystem ["x86_64-linux" "aarch64-linux"] (system: let
       pkgs = import nixpkgs {
@@ -19,9 +27,12 @@
     in {
       packages = rec {
         patchy-cnb = pkgs.callPackage ./pkgs/patchy-cnb.nix {};
-        claude-desktop = pkgs.callPackage ./pkgs/claude-desktop.nix {
+        claude-desktop = let
+          paramsContent = builtins.readFile claude-params;
+          params = if paramsContent == "" then {} else builtins.fromJSON paramsContent;
+        in pkgs.callPackage ./pkgs/claude-desktop.nix ({
           inherit patchy-cnb;
-        };
+        } // params);
         claude-desktop-with-fhs = pkgs.buildFHSEnv {
           name = "claude-desktop";
           targetPkgs = pkgs:

flake.nix

@@ -10,14 +10,19 @@
   makeDesktopItem,
   makeWrapper,
   patchy-cnb,
-  perl
+  perl,
+  # Allow overriding Claude executable parameters
+  claudeHash ? "sha256-ISyVjtr9vGzCqq7oaDQd6h9kC7iumyo38z9VjuVCsu4=",
+  claudeVersion ? "0.12.129",
+  claudeUrl ? "https://storage.googleapis.com/osprey-downloads-c02f6a0d-347c-492b-a752-3e0651722e97/nest-win-x64/Claude-Setup-x64.exe"
 }: let
   pname = "claude-desktop";
-  version = "0.12.129";
+  version = claudeVersion;
   srcExe = fetchurl {
-    # NOTE: `?v=0.10.0` doesn't actually request a specific version. It's only being used here as a cache buster.
-    url = "https://storage.googleapis.com/osprey-downloads-c02f6a0d-347c-492b-a752-3e0651722e97/nest-win-x64/Claude-Setup-x64.exe?v=${version}";
-    hash = "sha256-ISyVjtr9vGzCqq7oaDQd6h9kC7iumyo38z9VjuVCsu4=";
+    # Use the provided URL and version, or defaults
+    url = "${claudeUrl}?v=${version}";
+    # Hash can be overridden via flake input
+    hash = claudeHash;
   };
 in
   stdenvNoCC.mkDerivation rec {