Add NixOS mobase build to CI for Python plugin compatibility

NixOS users can't load our Ubuntu-compiled mobase.so due to ABI
differences. Add a parallel CI job that builds mobase.so in a Nix
environment so NixOS users can download and drop it into plugins/libs/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2 files changed, 113 insertions, 0 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2ce5cc2..612eed9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -65,3 +65,67 @@ jobs:
           path: build/fluorine-manager/
           compression-level: 6
           if-no-files-found: warn
+
+  build-nixos-mobase:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Cache Nix store
+        uses: actions/cache@v4
+        with:
+          path: /tmp/nix-cache
+          key: nix-mobase-${{ hashFiles('nix/mobase-shell.nix') }}
+          restore-keys: nix-mobase-
+
+      - name: Build mobase.so for NixOS
+        run: |
+          nix-shell nix/mobase-shell.nix --run "
+            set -euo pipefail
+
+            # Build libloot from source (not in nixpkgs)
+            git clone --depth 1 https://github.com/loot/libloot.git /tmp/libloot
+            cmake -S /tmp/libloot/cpp -B /tmp/libloot/build -G Ninja \
+              -DCMAKE_BUILD_TYPE=Release \
+              -DBUILD_SHARED_LIBS=ON \
+              -DLIBLOOT_INSTALL_DOCS=OFF \
+              -DBUILD_TESTING=OFF \
+              -DCMAKE_INSTALL_PREFIX=/tmp/libloot-install
+            cmake --build /tmp/libloot/build --parallel
+            cmake --install /tmp/libloot/build
+
+            # Configure full project (disable Rust FFI — not needed for mobase)
+            PYBIND11_DIR=\$(python3 -c 'import pybind11; print(pybind11.get_cmake_dir())')
+            cmake -S . -B build-nix -G Ninja \
+              -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+              -DPython_EXECUTABLE=\$(which python3) \
+              -Dpybind11_DIR=\"\${PYBIND11_DIR}\" \
+              -DBUILD_PLUGIN_PYTHON=ON \
+              -DBUILD_NAK_FFI=OFF \
+              -DBUILD_BSA_FFI=OFF \
+              -DCMAKE_PREFIX_PATH=/tmp/libloot-install \
+              -Dlibloot_DIR=/tmp/libloot-install
+
+            # Build only mobase target
+            cmake --build build-nix --target mobase --parallel
+
+            # Package it
+            mkdir -p nixos-mobase
+            cp build-nix/libs/plugin_python/src/mobase/mobase.cpython-*-linux-gnu.so nixos-mobase/
+            echo 'NixOS-compatible mobase pybind11 module for Fluorine Manager.' > nixos-mobase/README.txt
+            echo 'Drop this .so into your plugins/libs/ directory, replacing the existing one.' >> nixos-mobase/README.txt
+          "
+
+      - name: Upload NixOS mobase
+        uses: actions/upload-artifact@v4
+        with:
+          name: mobase-nixos
+          path: nixos-mobase/
+          compression-level: 6
+          if-no-files-found: warn
diff --git a/nix/mobase-shell.nix b/nix/mobase-shell.nix
new file mode 100644
index 0000000..19c8d34
--- /dev/null
+++ b/nix/mobase-shell.nix
@@ -0,0 +1,49 @@
+{ pkgs ? import <nixpkgs> {} }:

+

+pkgs.mkShell {

+  nativeBuildInputs = with pkgs; [

+    cmake

+    ninja

+    pkg-config

+    git

+  ];

+

+  buildInputs = with pkgs; [

+    # Qt 6

+    qt6.qtbase

+    qt6.wrapQtAppsHook

+    qt6.qtwebengine

+    qt6.qtwebsockets

+    qt6.qtsvg

+    qt6.qtwayland

+

+    # Python + pybind11

+    python313

+    python313Packages.pybind11

+    python313Packages.sip

+    python313Packages.pyqt6

+

+    # Libraries

+    boost

+    sqlite

+    tinyxml2

+    fontconfig

+    spdlog

+    fuse3

+    libcap

+    lz4

+    zlib

+    zstd

+    bzip2

+    xz

+    openssl

+    curl

+    tomlplusplus

+    fmt

+  ];

+

+  shellHook = ''

+    export PYTHONPATH="${pkgs.python313Packages.pybind11}/${pkgs.python313.sitePackages}:$PYTHONPATH"

+    export CMAKE_PREFIX_PATH="${pkgs.qt6.qtbase}:${pkgs.qt6.qtwebengine}:${pkgs.qt6.qtwebsockets}:${pkgs.qt6.qtsvg}:$CMAKE_PREFIX_PATH"

+  '';

+}