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Reproducible example

We encountered this issue while working on rerun-io/rerun#5966 (can be reproduced with commit 44412db2519cf2a37b0bd9d951cc4d8630eac037).

rm -rf .pixi
pixi run -e examples clock
# error indicating that rerun-sdk is pulled from pypi as expected

pixi run -e examples py-build  # calls maturin develop, which calls pip — should fix the error

pixi run -e examples clock

-> leads to the same initial error, as if py-build had no effect.

Issue description

It actually turns out that py-build does install a build-from-source rerun-sdk correctly, but this is reverted by the last call to pixi, possibly due to #998?

Interestingly, activating a shell is a possibly work-around:

rm -rf .pixi
pixi run -e examples clock
# error indicating that rerun-sdk is pulled from pypi as expected

pixi shell -e examples
pixi run -e examples py-build

clock  # -> works as expected

Another case where it appears to work as expected is in CI, with an environment set for the setup-pixi action: https://github.com/rerun-io/rerun/blob/36f00a5b0bd3edf06bc0f4ec65ce58f86a32e458/.github/workflows/reusable_build_examples.yml#L66-L86

Expected behavior

Ideally, pixi would make it easy and robust to manually "override" packages in the environments, including via pip specifically for when there is no other way (e.g maturin). This would cover at least two workflow:

• dev environment (run ${STUFF} against a build-from-source rerun)
• CI (run/test ${STUFF} against a CI-built wheel)

Workaround

For our particular case, @jleibs just had a workaround idea that appears to work:

1. we created a "empty" rerun-sdk local package somewhere (that would install a differently named empty python file)
2. we added an explicitly dependency on it in pixi.toml for the examples environment

That way, examples defaults to failing (no module named 'rerun'), and somehow a subsequent pixi run -e examples py-build doesn't end up being overridden.

pyproject.toml:

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[project]
name = "rerun-sdk"
version = "0.10.0"

[tool.hatch.build.targets.wheel]
packages = ["empty_rerun_sdk.py"]