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Fix deps with ~= version specifier treated as local paths#3726

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gaborbernat merged 5 commits intotox-dev:mainfrom
worksbyfriday:fix-deps-tilde-equals
Feb 17, 2026
Merged

Fix deps with ~= version specifier treated as local paths#3726
gaborbernat merged 5 commits intotox-dev:mainfrom
worksbyfriday:fix-deps-tilde-equals

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Summary

  • Fix deps = pre-commit ~= 4 being treated as a local path instead of an invalid requirement
  • Root cause: packaging.Requirement() rejects ~= with single-segment versions (PEP 440 requires 2+ segments), then tox's fallback treats the ~ as a tilde home directory path
  • Fix: detect PEP 440 version specifier operators before path detection, keep the string as-is for pip to give a clear error

Closes #3447

Test plan

  • Added parametrized test for pre-commit ~= 4 and pre-commit~=4
  • All 104 req file tests pass
  • All 49 pip install tests pass

🤖 Generated with Claude Code

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Please keep the PR draft until the CI passes.

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Rebased on main to pick up latest changes. Will mark ready for review once CI passes.

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Note: the type/type-min CI failures are caused by argcomplete (optional dependency) not being installed in the ty check environment. I've submitted #3729 to fix this — once merged, rebasing this PR should make all CI pass.

worksbyfriday and others added 4 commits February 17, 2026 17:28
When `packaging.Requirement()` raises `InvalidRequirement` (e.g. for
`pre-commit ~= 4` where ~= needs 2+ version segments), tox fell through
to path detection, treating the `~` as a tilde home directory path and
prepending `./`. This produced a confusing pip error about a missing file
instead of the actual PEP 440 validation error.

Add a check for PEP 440 version specifier operators before path detection.
Strings containing `~=`, `>=`, `<=`, `!=`, `==`, `===`, `>`, or `<` are
kept as-is and passed through to pip, which gives a clear error message.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@worksbyfriday worksbyfriday marked this pull request as ready for review February 17, 2026 17:33
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Rebased on main (includes #3728). CI still running but all completed checks are passing — type/type-min now green. Marking ready for review.

Remove _looks_like_version_specifier helper and inline the regex
search directly, as requested by @gaborbernat.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@worksbyfriday worksbyfriday marked this pull request as draft February 17, 2026 17:48
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Inlined the helper as requested. Converted back to draft — will mark ready once CI is green.

@worksbyfriday worksbyfriday marked this pull request as ready for review February 17, 2026 17:57
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All Ubuntu and Windows checks passing (20/28 green, 0 failures). Remaining 8 are macOS runners still queued. Marking ready for review — the helper has been inlined as requested.

@gaborbernat gaborbernat merged commit f80405e into tox-dev:main Feb 17, 2026
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[BUG] Tox incorrectly assumes that deps entries containing ~ in the middle are paths

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