fix(#2422): allow Nix package version generation

nix/packages.nix

@@ -28,6 +28,7 @@ pkgs.stdenv.mkDerivation {
     cp "${./../mcp_server.py}" "$out/${runtimeDir}/mcp_server.py"
     cp "${./../requirements.txt}" "$out/${runtimeDir}/requirements.txt"
     cp -r "${./../api}" "$out/${runtimeDir}/api"
+    chmod u+w "$out/${runtimeDir}/api"
     cp -r "${./../static}" "$out/${runtimeDir}/static"
     printf "__version__ = '%s'\n" "$version" > "$out/${runtimeDir}/api/_version.py"
 

tests/test_nix_flake_module_source.py

@@ -32,6 +32,7 @@ def test_nix_package_version_comes_from_flake_source_revision():
     assert "0.51.0" not in FLAKE_NIX
     assert "0.51.0" not in PACKAGES_NIX
     assert 'api/_version.py' in PACKAGES_NIX
+    assert 'chmod u+w "$out/${runtimeDir}/api"' in PACKAGES_NIX
 
 
 def test_nixos_module_decouples_agent_dir_from_python_inference():