test: fix llama.cpp

Author: anakin87

.github/workflows/llama_cpp.yml

@@ -29,6 +29,8 @@ concurrency:
 env:
   PYTHONUNBUFFERED: "1"
   FORCE_COLOR: "1"
+  TEST_MATRIX_OS: '["ubuntu-latest", "windows-latest", "macos-latest"]'
+  TEST_MATRIX_PYTHON: '["3.10", "3.14"]'
 
 jobs:
   compute-test-matrix:
@@ -37,26 +39,13 @@ jobs:
       run:
         working-directory: .
     outputs:
-      matrix: ${{ steps.set.outputs.matrix }}
+      os: ${{ steps.set.outputs.os }}
+      python-version: ${{ steps.set.outputs.python-version }}
     steps:
       - id: set
         run: |
-          if [ "${{ github.event_name }}" = "push" ]; then
-            echo 'matrix=[{"os":"ubuntu-latest","python-version":"3.10"}]' >> "$GITHUB_OUTPUT"
-          else
-            MATRIX='['
-            MATRIX+='{"os":"ubuntu-latest","python-version":"3.10"},'
-            MATRIX+='{"os":"ubuntu-latest","python-version":"3.14"},'
-            MATRIX+='{"os":"windows-latest","python-version":"3.10"},'
-            MATRIX+='{"os":"windows-latest","python-version":"3.14"},'
-            # On macOS, pre-built wheels for 3.14 are not available and installing from source
-            # might fail due to missing dependencies (CMake fails with "OpenMP not found").
-            # We test with 3.12 instead because pre-built wheels are available for this version.            
-            MATRIX+='{"os":"macos-latest","python-version":"3.10"},'
-            MATRIX+='{"os":"macos-latest","python-version":"3.12"}'
-            MATRIX+=']'
-            echo "matrix=$MATRIX" >> "$GITHUB_OUTPUT"
-          fi
+          echo 'os=${{ github.event_name == 'push' && '["ubuntu-latest"]' || env.TEST_MATRIX_OS }}' >> "$GITHUB_OUTPUT"
+          echo 'python-version=${{ github.event_name == 'push' && '["3.10"]' || env.TEST_MATRIX_PYTHON }}' >> "$GITHUB_OUTPUT"
 
   run:
     name: Python ${{ matrix.python-version }} on ${{ startsWith(matrix.os, 'macos-') && 'macOS' || startsWith(matrix.os, 'windows-') && 'Windows' || 'Linux' }}
@@ -68,7 +57,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include: ${{ fromJSON(needs.compute-test-matrix.outputs.matrix) }}
+        os: ${{ fromJSON(needs.compute-test-matrix.outputs.os) }}
+        python-version: ${{ fromJSON(needs.compute-test-matrix.outputs.python-version) }}
 
     steps:
       - name: Support longpaths

integrations/llama_cpp/pyproject.toml

@@ -26,12 +26,16 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
-dependencies = ["haystack-ai>=2.22.0", "llama-cpp-python>=0.2.87"]
+dependencies = [
+    "haystack-ai>=2.22.0",
+    "llama-cpp-python>=0.2.87"
+]
 
 # On macOS GitHub runners, we use a custom index to download pre-built wheels.
 # Installing from source might fail due to missing dependencies (CMake fails with "OpenMP not found")
 [tool.uv]
 index-strategy = "unsafe-best-match"  # this ensures that packages are not only searched in the below index but also in PyPI
+override-dependencies = ["llama-cpp-python!=0.3.20"] # this version is broken on the additional index
 [[tool.uv.index]]
 name = "llama-cpp-python-macos"
 url = "https://abetlen.github.io/llama-cpp-python/whl/metal/"