Packages that `replace` another circumvent dependency checks on installation
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调研方向
Reproduce the transaction using the listed sagemath and Cython package versions, then inspect the dependency checks performed during installation and replacement handling. Done means installing python3-Cython is rejected when it would remove the version required by sagemath, while the transaction remains consistent and xbps-pkgdb -a reports no unsatisfied dependency.
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描述
The package python3-Cython0.29 was created to provide a pre-3.0 version of Cython because half the dependants of python3-Cython will not build with 3.0 or later. The packages python3-Cython0.29 and python3-Cython conflict. This is usually not an issue because Cython is generally only a build-time dependency, so a package can hostmakedepend on one or the other as needed.
However, both urh and sagemath have run-time dependencies on python3-Cython0.29 (now; before the update to 3.0, they depended on python3-Cython). To smooth update paths for users, python3-Cython0.29 was marked replaces="python3-Cython>=0" while python3-Cython was marked replaces="python3-Cython0.29>=0" so that installing one will remove the other. Neither package provides the other because Cython 3 introduces breaking changes.
Installing or updating sagemath will cause python3-Cython0.29 to be installed as a dependency. Subsequently installing python3-Cython will succeed (removing python3-Cython0.29 in the process), although sagemath will now be broken because it is missing python3-Cython0.29
Steps to reproduce:
- [Optional] Install
sagemath<=10.1_1, which depends onpython3-Cython. Both packages are installed. - Install (or update to)
sagemath>=10.1_2, which depends onpython3-Cython0.29. Both packages will be installed, removing an existingpython3-Cythonpackage if previously installed. - Try removing
python3-Cython0.29:python3-Cython0.29-0.29.36_2 in transaction breaks installed pkg `sagemath-10.1_2' Transaction aborted due to unresolved dependencies. - Install
python3-Cython>=3.0.2_1. This will succeed, removingpython3-Cython0.29. - Running
xbps-pkgdb -areports an unsatisfied dependency forsagemath:ERROR: sagemath: dependency not satisfied: python3-Cython0.29>=0 - Updating (or force-reinstalling)
sagemathwill installpython3-Cython0.29and removepython3-Cython.
Expected behavior:
Step 4 should detect the unresolved dependency in the transaction, preventing the installation of python3-Cython.
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