Allow URL constraints to apply to requirements with extras#13886
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Allow URL constraints to apply to requirements with extras#13886
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Combining a URL-pinned constraint with a requirement that requests extras -- e.g. pinning `pandas` to a wheel URL while installing `pandas[performance]` -- used to crash the resolver with `AssertionError: 'pandas[performance]' != 'pandas' for wheel`. Constraints are keyed by base name, and `_get_with_identifier` intentionally falls back from `pkg[extra]` to `pkg` so that version/hash constraints don't need to be restated per extras combination. That fallback works well for specifier/hash data, but a constraint's link carries identity -- it *is* `pkg`, not `pkg[extra]` -- and flowing it into `_iter_candidates_from_constraints` under the extras-bearing identifier falls over because there's no handling of extras in it. Extracting the extras from the identifier (similar to how `_iter_explicit_candidates_from_base` already adapts regular requirements) and wrapping it in an `ExtrasCandidate` corrects the mismatch, handling the extras & constraints appropriately.
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Fixes #12018
Closes #12025 which it supercedes
I blame @ichard26 for making to me stare at this too long by asking me to review what kinda effort it would take to tackle https://github.com/pypa/pip/milestone/47.
Also, shoutout to @harupy for filing such a clear bug report -- I was able to recreate it even a few years down the line (with newer wheel & Python versions), and that was helped immensely by the fact that your report was clear, concise and to the point. It is appreciated! ^.^