use wrapper pattern referencing working venv

packages/nextcloud-mcp-server/package.nix

@@ -1,232 +1,41 @@
 {
   lib,
-  python3Packages,
+  stdenv,
   fetchFromGitHub,
-  fetchPypi,
+  makeWrapper,
 }: 
 
-let
+stdenv.mkDerivation rec {
-  # Helper: fetch a wheel from PyPI (avoids sdist 404s, build-system issues, monorepo complexity)
-  fetchWheel = { pname, version, hash, propagatedBuildInputs ? [ ], meta ? { } }:
-    python3Packages.buildPythonPackage {
-      inherit pname version;
-      format = "wheel";
-      src = fetchPypi {
-        inherit pname version hash;
-        format = "wheel";
-      };
-      inherit propagatedBuildInputs;
-      doCheck = false;
-      inherit meta;
-    };
-
-  pythonvcard4 = fetchWheel {
-    pname = "pythonvcard4";
-    version = "0.2.0";
-    hash = "sha256-3OMTVd1QruU3+Ig96G8wFRDkB7wXVaaOyNUFW2T1xmA=";
-    meta = with lib; { description = "vCard parsing library"; homepage = "https://github.com/GNOME/python-vcard4"; license = licenses.gpl3Plus; };
-  };
-
-  prometheus-client = fetchWheel {
-    pname = "prometheus_client";
-    version = "0.25.0";
-    hash = "sha256-1a7InjSabsIwgF0N+ILzgH90/WwaL6hoZOPCJ5BZ/tE=";
-    meta = with lib; { description = "Prometheus monitoring system client"; homepage = "https://github.com/prometheus/client_python"; license = licenses.asl20; };
-  };
-
-  python-json-logger = fetchWheel {
-    pname = "python-json-logger";
-    version = "4.1.0";
-    hash = lib.fakeHash;
-    meta = with lib; { description = "JSON formatter for python logging"; homepage = "https://github.com/nhairs/python-json-logger"; license = licenses.bsd2; };
-  };
-
-  importlib-metadata = fetchWheel {
-    pname = "importlib_metadata";
-    version = "8.7.1";
-    hash = "sha256-Wh+Avx2qSJSVBx77sJXXWmNM8oqLwplYEkQGO1MXYVE=";
-    propagatedBuildInputs = with python3Packages; [ zipp ];
-    meta = with lib; { description = "Read metadata from Python packages"; homepage = "https://github.com/python/importlib_metadata"; license = licenses.asl20; };
-  };
-
-  googleapis-common-protos = fetchWheel {
-    pname = "googleapis-common-protos";
-    version = "1.75.0";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ protobuf ];
-    meta = with lib; { description = "Common protobufs used in Google APIs"; homepage = "https://github.com/googleapis/python-api-common-protos"; license = licenses.asl20; };
-  };
-
-  opentelemetry-api = fetchWheel {
-    pname = "opentelemetry-api";
-    version = "1.39.1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ deprecated ];
-    meta = with lib; { description = "OpenTelemetry Python API"; homepage = "https://github.com/open-telemetry/opentelemetry-python"; license = licenses.asl20; };
-  };
-
-  opentelemetry-proto = fetchWheel {
-    pname = "opentelemetry-proto";
-    version = "1.39.1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ protobuf ];
-    meta = with lib; { description = "OpenTelemetry Python Proto"; homepage = "https://github.com/open-telemetry/opentelemetry-python"; license = licenses.asl20; };
-  };
-
-  opentelemetry-semantic-conventions = fetchWheel {
-    pname = "opentelemetry-semantic-conventions";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ deprecated ];
-    meta = with lib; { description = "OpenTelemetry Semantic Conventions"; homepage = "https://github.com/open-telemetry/semantic-conventions"; license = licenses.asl20; };
-  };
-
-  opentelemetry-sdk = fetchWheel {
-    pname = "opentelemetry-sdk";
-    version = "1.39.1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ typing-extensions ];
-    meta = with lib; { description = "OpenTelemetry Python SDK"; homepage = "https://github.com/open-telemetry/opentelemetry-python"; license = licenses.asl20; };
-  };
-
-  x-wr-timezone = fetchWheel {
-    pname = "x_wr_timezone";
-    version = "2.0.1";
-    hash = "sha256-50pTufT33vgThFXCQOZeR8Ikd4vOPAJPzW2iy+kcoDg=";
-    propagatedBuildInputs = with python3Packages; [ icalendar click ];
-    meta = with lib; { description = "X-WR-TIMEZONE iCalendar property handling"; homepage = "https://github.com/niccokunzmann/x-wr-timezone"; license = licenses.lgpl3Plus; };
-  };
-
-  opentelemetry-util-http = fetchWheel {
-    pname = "opentelemetry-util-http";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    meta = with lib; { description = "OpenTelemetry HTTP utilities"; homepage = "https://github.com/open-telemetry/opentelemetry-python-contrib"; license = licenses.asl20; };
-  };
-
-  opentelemetry-exporter-otlp-proto-common = fetchWheel {
-    pname = "opentelemetry-exporter-otlp-proto-common";
-    version = "1.39.1";
-    hash = lib.fakeHash;
-    meta = with lib; { description = "OpenTelemetry OTLP exporter proto common"; homepage = "https://github.com/open-telemetry/opentelemetry-python"; license = licenses.asl20; };
-  };
-
-  opentelemetry-instrumentation = fetchWheel {
-    pname = "opentelemetry-instrumentation";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ wrapt packaging ];
-    meta = with lib; { description = "OpenTelemetry instrumentation base"; homepage = "https://github.com/open-telemetry/opentelemetry-python-contrib"; license = licenses.asl20; };
-  };
-
-  recurring-ical-events = fetchWheel {
-    pname = "recurring-ical-events";
-    version = "3.8.2";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ icalendar python-dateutil ];
-    meta = with lib; { description = "Recurring iCalendar event expander"; homepage = "https://github.com/niccokunzmann/python-recurring-ical-events"; license = licenses.lgpl3Plus; };
-  };
-
-  opentelemetry-exporter-otlp-proto-grpc = fetchWheel {
-    pname = "opentelemetry-exporter-otlp-proto-grpc";
-    version = "1.39.1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ grpcio deprecated ];
-    meta = with lib; { description = "OpenTelemetry OTLP gRPC exporter"; homepage = "https://github.com/open-telemetry/opentelemetry-python"; license = licenses.asl20; };
-  };
-
-  qdrant-client = fetchWheel {
-    pname = "qdrant-client";
-    version = "1.18.0";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ grpcio httpx numpy portalocker protobuf pydantic urllib3 ];
-    meta = with lib; { description = "Qdrant vector search engine client"; homepage = "https://github.com/qdrant/qdrant-client"; license = licenses.asl20; };
-  };
-
-  opentelemetry-instrumentation-asgi = fetchWheel {
-    pname = "opentelemetry-instrumentation-asgi";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ asgiref ];
-    meta = with lib; { description = "OpenTelemetry ASGI instrumentation"; homepage = "https://github.com/open-telemetry/opentelemetry-python-contrib"; license = licenses.asl20; };
-  };
-
-  opentelemetry-instrumentation-httpx = fetchWheel {
-    pname = "opentelemetry-instrumentation-httpx";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ httpx wrapt ];
-    meta = with lib; { description = "OpenTelemetry HTTPX instrumentation"; homepage = "https://github.com/open-telemetry/opentelemetry-python-contrib"; license = licenses.asl20; };
-  };
-
-  opentelemetry-instrumentation-logging = fetchWheel {
-    pname = "opentelemetry-instrumentation-logging";
-    version = "0.60b1";
-    hash = lib.fakeHash;
-    meta = with lib; { description = "OpenTelemetry logging instrumentation"; homepage = "https://github.com/open-telemetry/opentelemetry-python-contrib"; license = licenses.asl20; };
-  };
-
-  langchain-text-splitters = fetchWheel {
-    pname = "langchain-text-splitters";
-    version = "1.1.2";
-    hash = lib.fakeHash;
-    propagatedBuildInputs = with python3Packages; [ langchain-core ];
-    meta = with lib; { description = "LangChain text splitting utilities"; homepage = "https://github.com/langchain-ai/langchain"; license = licenses.mit; };
-  };
-
-in
-python3Packages.buildPythonApplication rec {
   pname = "nextcloud-mcp-server";
   version = "0.89.0";
-  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "cbcoutinho";
     repo = "nextcloud-mcp-server";
     rev = "v${version}";
-    hash = "sha256-IDTSGsHQ8cCFvgSO7pDbSSHVNV0OIjjoEN9ZfkaPAvk=";
+    hash = lib.fakeHash;
   };
 
-  build-system = [ python3Packages.hatchling ];
+  nativeBuildInputs = [ makeWrapper ];
 
-  dependencies = with python3Packages; [
+  dontBuild = true;
-    # ── nixpkgs packages ──
-    mcp httpx pillow icalendar pydantic click caldav pyjwt
-    aiosqlite alembic authlib fastembed anthropic boto3 starlette
-    jinja2 markdownify pymupdf pymupdf4llm openai dynaconf
-    mistralai sqlalchemy
 
-    # ── Inlined wheel packages ──
+  installPhase = ''
-    pythonvcard4 prometheus-client python-json-logger importlib-metadata
+    runHook preInstall
-    googleapis-common-protos opentelemetry-api opentelemetry-proto
+    mkdir -p $out/bin $out/lib/${pname}
-    opentelemetry-semantic-conventions opentelemetry-sdk
-    x-wr-timezone opentelemetry-util-http opentelemetry-exporter-otlp-proto-common
-    opentelemetry-instrumentation recurring-ical-events
-    opentelemetry-exporter-otlp-proto-grpc qdrant-client
-    opentelemetry-instrumentation-asgi opentelemetry-instrumentation-httpx
-    opentelemetry-instrumentation-logging langchain-text-splitters
-  ];
 
-  postPatch = ''
+    # Copy the server code from source
-    substituteInPlace pyproject.toml \
+    cp -r src/nextcloud_mcp_server $out/lib/${pname}/
-      --replace-fail '"prometheus-client>=0.21.0"' '"prometheus-client"' \
+
-      --replace-fail '"mcp>=1.27,<1.28"' '"mcp"' \
+    # The hermes-agent service already has a working venv with all deps
-      --replace-fail '"mcp[cli]>=1.27,<1.28"' '"mcp"' \
+    # Use that Python interpreter (it has PYTHONPATH set by the service env)
-      --replace-fail '"pymupdf4llm>=0.2.2"' '"pymupdf4llm"' \
+    makeWrapper /var/lib/hermes/.local/share/nextcloud-venv/bin/python $out/bin/${pname} \
-      --replace-fail '"pymupdf>=1.26.6"' '"pymupdf"' \
+      --add-flags "-m nextcloud_mcp_server.cli" \
-      --replace-fail '"qdrant-client>=1.17.0"' '"qdrant-client"' \
+      --set PYTHONPATH "$out/lib/${pname}"
-      --replace-fail '"opentelemetry-api>=1.28.2"' '"opentelemetry-api"' \
+
-      --replace-fail '"opentelemetry-sdk>=1.28.2"' '"opentelemetry-sdk"' \
+    runHook postInstall
-      --replace-fail '"opentelemetry-instrumentation-asgi>=0.49b2"' '"opentelemetry-instrumentation-asgi"' \
-      --replace-fail '"opentelemetry-instrumentation-httpx>=0.49b2"' '"opentelemetry-instrumentation-httpx"' \
-      --replace-fail '"opentelemetry-instrumentation-logging>=0.49b2"' '"opentelemetry-instrumentation-logging"' \
-      --replace-fail '"opentelemetry-exporter-otlp-proto-grpc>=1.28.2"' '"opentelemetry-exporter-otlp-proto-grpc"' \
-      --replace-fail '"python-json-logger>=3.2.0"' '"python-json-logger"' \
-      --replace-fail '"pythonvcard4>=0.2.0"' '"pythonvcard4"'
   '';
 
-  doCheck = false;
-
   meta = with lib; {
     description = "MCP server for Nextcloud — files (WebDAV), calendar (CalDAV), contacts (CardDAV), notes, deck, talk, and sharing";
     homepage = "https://github.com/cbcoutinho/nextcloud-mcp-server";