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Version matching bug (or feature)? #4729

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andras-kth opened this issue Nov 10, 2021 · 2 comments · Fixed by python-poetry/poetry-core#396 · May be fixed by python-poetry/poetry-core#379
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Version matching bug (or feature)? #4729

andras-kth opened this issue Nov 10, 2021 · 2 comments · Fixed by python-poetry/poetry-core#396 · May be fixed by python-poetry/poetry-core#379
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kind/bug Something isn't working as expected

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@andras-kth
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  • I have searched the issues of this repo and believe that this is not a duplicate.
  • I have searched the documentation and believe that my question is not covered.

Issue

The "weak equality" logic in poetry.core.semver.version.allows appears to treat non-local to local and local to non-local version comparison symmetrically. For example,

>>> from poetry.core.semver.helpers import parse_constraint
>>> local_version = parse_constraint('==1.10.0+cu113')
>>> public_version = parse_constraint('==1.10.0')
>>> public_version.allows(local_version)
True
>>> local_version.allows(public_version)
True
>>>

My expectation, apparently also supported by PEP 440, would be that the latter should evaluate to False.

If the specified version identifier is a public version identifier (no local version label), then the local version label of any candidate versions MUST be ignored when matching versions.

If the specified version identifier is a local version identifier, then the local version labels of candidate versions MUST be considered when matching versions, with the public version identifier being matched as described above, and the local version label being checked for equivalence using a strict string equality comparison.

https://www.python.org/dev/peps/pep-0440/#version-matching

What do you think? Is this a bug or a feature?
Or, perhaps, my interpretation of PEP 440 is wrong, and this is a compliant implementation...
@andras-kth andras-kth mentioned this issue Nov 10, 2021
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@abn
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abn commented Apr 27, 2022 •
edited

I would say this is a bug. And that the following lines in core should be removed.

https://github.com/python-poetry/poetry-core/blob/b1cc9188fb8de8ab9104565392a54f9f4343a204/src/poetry/core/semver/version.py#L89-L90

I also suspect these lines (or similar) should be added to VersionRange.allows.

            elif _this.is_local() and (not _other.is_local() or _this.local != _other.local):
                return False

https://github.com/python-poetry/poetry-core/blob/b1cc9188fb8de8ab9104565392a54f9f4343a204/src/poetry/core/semver/version_range.py#L81-L83

This was introduced explicitly in the following PRs.

That said, I suspect the correct behaviour is to always ensure local tag is respected when compared, ie. that tag must exist even for public version identifiers are within allowed ranges. Eg: <=3.0.1+local.1 should disallow 3.0.0, 3.0.1 and 3.0.0+local.0 (this one i am a bit on the edge as this can be useful and is ambiguous in the spec); but allow 3.0.0+local.1 and 3.0.1+local.1.

This was referenced Apr 27, 2022
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@Secrus Secrus added the kind/bug Something isn't working as expected label May 18, 2022
@abn abn mentioned this issue May 26, 2022
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abn added a commit to abn/poetry-core that referenced this issue May 26, 2022
@abn
version: fix local label comparison
cfdccfc 
Prior to this change, local label comparison was inconsistent with
PEP 440. This change ensures that the local version label is checked
for equivalence using a strict string equality comparison.

Resolves: python-poetry/poetry#4729
@abn abn mentioned this issue May 26, 2022
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abn added a commit to abn/poetry-core that referenced this issue May 26, 2022
@abn
version: fix local label comparison
64446f9 
Prior to this change, local label comparison was inconsistent with
PEP 440. This change ensures that the local version label is checked
for equivalence using a strict string equality comparison.

Resolves: python-poetry/poetry#4729
@radoering radoering mentioned this issue Jun 7, 2022
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@bradleyhurley bradleyhurley mentioned this issue Sep 20, 2022
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