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Use path file instead of sitecustomize.py #7161

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Sep 9, 2024
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Use path file instead of sitecustomize.py #7161

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6 changes: 4 additions & 2 deletions crates/uv/src/commands/project/run.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -612,9 +612,11 @@ pub(crate) async fn run(
})
};

// If we're running in an ephemeral environment, add a `sitecustomize.py` to enable loading of
// If we're running in an ephemeral environment, add a path file to enable loading of
// the base environment's site packages. Setting `PYTHONPATH` is insufficient, as it doesn't
// resolve `.pth` files in the base environment.
// And `sitecustomize.py` would be an alternative but it can be shadowed by an existing such
// module in the python installation.
if let Some(ephemeral_env) = ephemeral_env.as_ref() {
let ephemeral_site_packages = ephemeral_env
.site_packages()
Expand All @@ -626,7 +628,7 @@ pub(crate) async fn run(
.ok_or_else(|| anyhow!("Base environment has no site packages directory"))?;

fs_err::write(
ephemeral_site_packages.join("sitecustomize.py"),
ephemeral_site_packages.join("_uv_ephemeral_overlay.pth"),
format!(
"import site; site.addsitedir(\"{}\")",
base_site_packages.escape_for_python()
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