🐞 bug report

Yesterday around 2p PDT, bazel test //:requirements_test inexplicably started failing with an unhelpful error:

==================== Test output for //:requirements_test:
Backend subprocess exited when trying to invoke prepare_metadata_for_build_wheel
Failed to parse /.../pyproject.toml
pip-compile exited with code 2. This means that pip-compile found incompatible requirements or could not find a version that matches the install requirement in one of ['pyproject.toml'].
Checking requirements.txt
================================================================================

The first source of friction was debugging the underlying error. After finding the underlying dependency_resolver.py command, running it manually with --verbose shows a more helpful message:

error: invalid command 'bdist_wheel'

But this still remains perplexing, as we saw the wheel package being installed earlier in the output. Then it started inexplicably working again this morning, which led me to pypa/wheel#662. wheel released a version that broke here and they yanked it, causing it to work again.

Overall, this was very confusing because we don't expect to encounter these types of issues anymore with a hermetic build system.

Requests:

1. Expose a mechanism to run pip-compile with --verbose
2. If pip-compile exits with anything other than "incompatible dependencies", suggest rerunning with --verbose
3. Pin the version of wheel/setuptools that are being installed

Affected Rule

Is this a regression?

Description

🔬 Minimal Reproduction

🔥 Exception or Error

🌍 Your Environment

Operating System:

Output of bazel version:

Rules_python version:

Anything else relevant?