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uv-resolver: partially revert Requires-Python version narrowing

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The PR #4707 introduced the notion of "version narrowing," where a
Requires-Python constraint was _possibly_ narrowed whenever the
universal resolver created a fork. The version narrowing would occur
when the fork was a result of a marker expression on `python_version`
that is *stricter* than the configured `Requires-Python` (via, say,
`pyproject.toml`).

The crucial conceptual change made by #4707 is therefore that
`Requires-Python` is no longer an invariant configuration of resolution,
but rather a mutable constraint that can vary from fork to fork. This in
turn can result in some cases, such as in #4885, where different
versions of dependencies are selected. We aren't sure whether we can fix
those or not, with version narrowing, so for now, we do this revert to
restore the previous behavior and we'll try to address the version
narrowing some other time.

This also adds the case from #4885 as a regression test, ensuring that
we don't break that in the future. I confirmed that with version
narrowing, this test outputs duplicate distributions. Without narrowing,
there are no duplicates.

Ref #4707, Fixes #4885
This commit is contained in:
Andrew Gallant 2024-07-08 11:55:13 -04:00 • committed by Andrew Gallant
parent ac3a085084
commit 857d2e8f1e
3 changed files with 141 additions and 4 deletions
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15
crates/uv-resolver/src/python_requirement.rs
View file

@ -50,7 +50,19 @@ impl PythonRequirement {
/// Narrow the [`PythonRequirement`] to the given version, if it's stricter (i.e., greater)
/// than the current `Requires-Python` minimum.
pub fn narrow(&self, target: &RequiresPythonBound) -> Option<Self> {
pub fn narrow(&self, _target: &RequiresPythonBound) -> Option<Self> {
// This represents a "small revert" of the PR that added
// Requires-Python version narrowing[1]. But narrowing has
// led to at least one bug[2] whose fix is not clear. We
// decided to revert narrowing under the idea that it is better
// to be strict (i.e., fail to resolve in some cases, like
// universal_requires_python in uv/tests/pip_compile) than it
// is to output an incorrect lock, as in [2].
//
// [1]: https://github.com/astral-sh/uv/pull/4707
// [2]: https://github.com/astral-sh/uv/issues/4885
None
/*
let Some(PythonTarget::RequiresPython(requires_python)) = self.target.as_ref() else {
return None;
};
@ -59,6 +71,7 @@ impl PythonRequirement {
installed: self.installed.clone(),
target: Some(PythonTarget::RequiresPython(requires_python)),
})
*/
}
/// Return the installed version of Python.