Debug Darwin failure

.github/workflows/ci.yml

@@ -27,7 +27,15 @@ jobs:
         name: '${{ env.CACHIX_NAME }}'
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-    - run: nix --experimental-features 'nix-command flakes' flake check -L
+    - run: |
+        if ! failed=$(nix --experimental-features 'nix-command flakes' build .#nix.python-bindings --keep-failed -L 2>&1 | tee /dev/stderr | grep -oP "(?<=note: keeping build directory ').*(?=')"; then
+          echo "artifactPath=$failed" >> $GITHUB_ENV
+        fi
+    - uses: actions/upload-artifact@v3
+      with:
+        name: failed-python-bindings
+        path: ${{ env.artifactPath }}
+
 
   check_secrets:
     permissions:

python/test.sh

@@ -1,7 +1,12 @@
+set -x
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 
 cd "$SCRIPT_DIR"/../tests
 
 source init.sh
 
+nix show-config >&2
+which python >&2
+realpath $(which python) >&2
+
 python "$SCRIPT_DIR"/tests.py