@hundreds-father-404 mentioned that there was a bash script that made sure that native_engine.so is available to get packaged into the Digest that gets materialized to the pytest EPRs - I take it that's build_support/bin/native/bootstrap_code.sh ?

yes. and a bunch of scripts that call that, starting with

venv

iirc. I don’t think those are relevant though - they fingerprint the Rust code to determine when

build_support/bin/native/bootstrap_code.sh

should e called