Unbound variable when creating a venv

[hentt30]

For rules_uv >= 0.18.0, the create_venv.sh script fails with the error "bash site_packages_extra_files[@]: unbound variable" when site_packages_extra_files is not set. The root cause appears to be the -u option in set -u, which interprets ${site_packages_extra_files[@]} as unset.

How to reproduce:
docker run -it --entrypoint bash bash:3.2.57 -c 'set -euo pipefail; for file in "${site_packages_extra_files[@]}"; do echo "test"; done;'

Solution:
check whether the variable site_packages_extra_files exists before executing the for loop.

[mark-thm]

Fixed by 531938b

[hentt30]

Thanks!