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## Summary Fixes https://github.com/astral-sh/ty/issues/640. If a user passes `--python=<some-virtual-environment>/bin/python`, we must avoid canonicalizing the path until we've traversed upwards to find the `sys.prefix` directory (`<some-virtual-environment>`). On Unix systems, `<sys.prefix>/bin/python` is often a symlink to a system interpreter; if we resolve the symlink too easily then we'll add the system interpreter's `site-packages` directory as a search path rather than the virtual environment's directory. ## Test Plan I added an integration test to `crates/ty/tests/cli/python_environment.rs` which fails on `main`. I also manually tested locally that running `cargo run -p ty check foo.py --python=.venv/bin/python -vv` now prints this log to the terminal ``` 2025-06-20 18:35:24.57702 DEBUG Resolved site-packages directories for this virtual environment are: SitePackagesPaths({"/Users/alexw/dev/ruff/.venv/lib/python3.13/site-packages"}) ``` Whereas it previously resolved `site-packages` to my system intallation's `site-packages` directory |
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