• Replacement for pkgs/sagemath-standard: Move metadata from setup.cfg to pyproject.toml #37902 (rebased to current beta).
• Part of Migrate from setup.cfg to pyproject.toml #33577
• See also pkgs/sage-conf: Move metadata from setup.cfg to pyproject.toml #36561

Goal of the PR:

• Modernize metadata of sagemath-standard by getting rid of the setup.cfg in favor of pyproject.toml.

Status quo:

• The runtime dependencies of the Sage library are declared in src/setup.cfg.m4; at bootstrapping time, src/setup.cfg is generated, and the version constraints obtained via sage-get-system-packages install-requires are substituted.
• These version constraints for most packages come directly from source files build/pkgs/*/version_requirements.txt (these files until not long ago were called install-requires.txt).
• For the runtime dependencies that happen to also be build dependencies of sagelib, after @tobiasdiez's Make pyproject.toml the source for build dependencies #36982, which was "making src/pyproject.toml the single source of truth", these build/pkgs/*/version_requirements.txt files are not source files but are generated at bootstrap time. The lists of these special packages appear 1x in .gitignore, 1x in Makefile, 2x in bootstrap.
• Reading the information from the src/pyproject.toml file is done by the script build/bin/sage-get-system-packages install-requires[-toml].

Scope and implementation strategy of the PR:

• Get rid of the quadrupled explicit list of special packages, a maintenance burden that already caused breakage (sagemath-standard: some fixes in build dependencies #37894 (comment)), by making all version_requirements.txt files source files again; for the special packages, without actual version information.
  • These files define the map between SPKG names and Python distribution names.
  • These files in the repository are also recognized by repology.org as marker files for Python packages (vs. non-Python packages) in the Sage distribution, as already noted in Make pyproject.toml the source for build dependencies #36982 (comment)
• Generalize build/bin/sage-get-system-packages install-requires[-toml] so as to read not only from the build requirements but also from the runtime dependencies now declared in src/pyproject.toml.
• Move version constraints for the packages that are runtime dependencies to src/pyproject.toml, leave behind build/pkgs/*/version_requirements.txt files without version constraints.
• Move the other metadata to src/pyproject.toml.
• Update the documentation.

Outside of the scope of this PR:

• Everything else.

📝 Checklist

• The title is concise and informative.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation and checked the documentation preview.

⌛ Dependencies