From bbbc5e01379f4a24dbbc8b1885aabe1ff666e712 Mon Sep 17 00:00:00 2001
From: forbes <zoe.forbes@kindred-systems.com>
Date: Tue, 3 Feb 2026 17:59:05 -0600
Subject: [PATCH] ci: use venv for PEP 668 compatibility on runner

---
 .gitea/workflows/ci.yaml | 45 +++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index ba51099..c59dba5 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -26,6 +26,7 @@ on:
 env:
   PIP_CACHE_DIR: /tmp/pip-cache-solver
   TORCH_INDEX: https://download.pytorch.org/whl/cpu
+  VIRTUAL_ENV: /tmp/solver-venv
 
 jobs:
   # ---------------------------------------------------------------------------
@@ -33,6 +34,8 @@ jobs:
   # ---------------------------------------------------------------------------
   lint:
     runs-on: ubuntu-latest
+    env:
+      PATH: /tmp/solver-venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
     steps:
       - name: Trust internal CA
         run: |
@@ -43,9 +46,11 @@ jobs:
       - name: Checkout
         uses: https://github.com/actions/checkout@v4
 
+      - name: Set up venv
+        run: python3 -m venv $VIRTUAL_ENV
+
       - name: Install lint tools
-        run: |
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR ruff
+        run: pip install --cache-dir $PIP_CACHE_DIR ruff
 
       - name: Ruff check
         run: ruff check solver/ freecad/ tests/ scripts/
@@ -58,6 +63,8 @@ jobs:
   # ---------------------------------------------------------------------------
   type-check:
     runs-on: ubuntu-latest
+    env:
+      PATH: /tmp/solver-venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
     steps:
       - name: Trust internal CA
         run: |
@@ -68,14 +75,16 @@ jobs:
       - name: Checkout
         uses: https://github.com/actions/checkout@v4
 
+      - name: Set up venv
+        run: python3 -m venv $VIRTUAL_ENV
+
       - name: Install dependencies
         run: |
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
+          pip install --cache-dir $PIP_CACHE_DIR \
             mypy numpy scipy \
             torch --index-url $TORCH_INDEX
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
-            torch-geometric
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR -e ".[dev]"
+          pip install --cache-dir $PIP_CACHE_DIR torch-geometric
+          pip install --cache-dir $PIP_CACHE_DIR -e ".[dev]"
 
       - name: Mypy
         run: mypy solver/ freecad/
@@ -85,6 +94,8 @@ jobs:
   # ---------------------------------------------------------------------------
   test:
     runs-on: ubuntu-latest
+    env:
+      PATH: /tmp/solver-venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
     steps:
       - name: Trust internal CA
         run: |
@@ -95,13 +106,15 @@ jobs:
       - name: Checkout
         uses: https://github.com/actions/checkout@v4
 
+      - name: Set up venv
+        run: python3 -m venv $VIRTUAL_ENV
+
       - name: Install dependencies
         run: |
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
+          pip install --cache-dir $PIP_CACHE_DIR \
             torch --index-url $TORCH_INDEX
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
-            torch-geometric
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR -e ".[train,dev]"
+          pip install --cache-dir $PIP_CACHE_DIR torch-geometric
+          pip install --cache-dir $PIP_CACHE_DIR -e ".[train,dev]"
 
       - name: Run tests
         run: pytest tests/ freecad/tests/ -v --tb=short
@@ -115,6 +128,8 @@ jobs:
       (github.event_name == 'workflow_dispatch' && inputs.run_datagen == true) ||
       (github.event_name == 'push' && github.ref == 'refs/heads/main')
     needs: [test]
+    env:
+      PATH: /tmp/solver-venv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
     steps:
       - name: Trust internal CA
         run: |
@@ -125,13 +140,15 @@ jobs:
       - name: Checkout
         uses: https://github.com/actions/checkout@v4
 
+      - name: Set up venv
+        run: python3 -m venv $VIRTUAL_ENV
+
       - name: Install dependencies
         run: |
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
+          pip install --cache-dir $PIP_CACHE_DIR \
             torch --index-url $TORCH_INDEX
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR \
-            torch-geometric
-          python3 -m pip install --cache-dir $PIP_CACHE_DIR -e ".[train]"
+          pip install --cache-dir $PIP_CACHE_DIR torch-geometric
+          pip install --cache-dir $PIP_CACHE_DIR -e ".[train]"
 
       - name: Restore datagen checkpoint
         id: datagen-cache