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scripts: force 'fork' multiprocessing when creating sharedir #84

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e8c5e40
scripts: force 'fork' multiprocessing when creating sharedir
morehouse May 18, 2026
4e5897f
scripts: inject sitecustomize.py to force fork
morehouse May 20, 2026
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14 changes: 12 additions & 2 deletions scripts/setup-nyx.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -60,9 +60,19 @@ docker rm "$CONTAINER_ID" > /dev/null
echo "Copying packer binaries..."
cp "$BINARIES_PATH"/* "$SHAREDIR/"

# Generate Nyx config
# Generate Nyx config.
#
# Python 3.14 changed the default multiprocessing start method to 'forkserver',
# which breaks the packer's common/debug.py. We force 'fork' via a
# sitecustomize.py injected on PYTHONPATH to restore the pre-3.14 behavior.
echo "Generating Nyx config..."
(cd "$PACKER_PATH" && python3 nyx_config_gen.py "$SHAREDIR" Kernel -m 4096)
FORCE_FORK_DIR="$(mktemp -d)"
trap 'rm -rf "$FORCE_FORK_DIR"' EXIT
cat > "$FORCE_FORK_DIR/sitecustomize.py" <<'EOF'
import multiprocessing
multiprocessing.set_start_method("fork", force=True)
EOF
(cd "$PACKER_PATH" && PYTHONPATH="$FORCE_FORK_DIR${PYTHONPATH:+:$PYTHONPATH}" ./nyx_config_gen.py "$SHAREDIR" Kernel -m 4096)

# Create fuzz_no_pt.sh script
echo "Creating fuzz_no_pt.sh..."
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