pyproject RPM macros ==================== These macros allow projects that follow the Python [packaging specifications] to be packaged as RPMs. They are still *provisional*: we can make non-backwards-compatible changes to the API. Please subscribe to Fedora's [python-devel list] if you use the macros. They work for: * traditional Setuptools-based projects that use the `setup.py` file, * newer Setuptools-based projects that have a `setup.cfg` file, * general Python projects that use the [PEP 517] `pyproject.toml` file (which allows using any build system, such as setuptools, flit or poetry). These macros replace `%py3_build` and `%py3_install`, which only work with `setup.py`. [packaging specifications]: https://packaging.python.org/specifications/ [python-devel list]: https://lists.fedoraproject.org/archives/list/python-devel@lists.fedoraproject.org/ Usage ----- To use these macros, first BuildRequire them: BuildRequires: pyproject-rpm-macros Also BuildRequire the devel package for the Python you are building against. In Fedora, that's `python3-devel`. (In the future, we plan to make `python3-devel` itself require `pyproject-rpm-macros`.) Next, you need to generate more build dependencies (of your projects and the macros themselves) by running `%pyproject_buildrequires` in the `%generate_buildrequires` section: %generate_buildrequires %pyproject_buildrequires This will add build dependencies according to [PEP 517] and [PEP 518]. To also add run-time and test-time dependencies, see the section below. If you need more dependencies, such as non-Python libraries, BuildRequire them manually. Note that `%generate_buildrequires` may produce error messages `(exit 11)` in the build log. This is expected behavior of BuildRequires generators; see [the Fedora change] for details. [the Fedora change]: https://fedoraproject.org/wiki/Changes/DynamicBuildRequires Then, build a wheel in `%build` with `%pyproject_wheel`: %build %pyproject_wheel And install the wheel in `%install` with `%pyproject_install`: %install %pyproject_install `%pyproject_install` installs all wheels in `$PWD/pyproject-wheeldir/`. Adding run-time and test-time dependencies ------------------------------------------ To run tests in the `%check` section, the package's runtime dependencies often need to also be included as build requirements. This can be done using the `-r` flag: %generate_buildrequires %pyproject_buildrequires -r For this to work, the project's build system must support the [`prepare-metadata-for-build-wheel` hook](https://www.python.org/dev/peps/pep-0517/#prepare-metadata-for-build-wheel). The popular buildsystems (setuptools, flit, poetry) do support it. For projects that specify test requirements using an [`extra` provide](https://packaging.python.org/specifications/core-metadata/#provides-extra-multiple-use), these can be added using the `-x` flag. Multiple extras can be supplied as a comma separated list. For example, if upstream suggests installing test dependencies with `pip install mypackage[testing]`, the test deps would be generated by: %generate_buildrequires %pyproject_buildrequires -x testing For projects that specify test requirements in their [tox] configuration, these can be added using the `-t` flag (default tox environment) or the `-e` flag followed by the tox environment. The default tox environment (such as `py37` assuming the Fedora's Python version is 3.7) is available in the `%{toxenv}` macro. For example, if upstream suggests running the tests on Python 3.7 with `tox -e py37`, the test deps would be generated by: %generate_buildrequires %pyproject_buildrequires -t If upstream uses a custom derived environment, such as `py37-unit`, use: %pyproject_buildrequires -e %{toxenv}-unit Or specify more environments if needed: %pyproject_buildrequires -e %{toxenv}-unit,%{toxenv}-integration The `-e` option redefines `%{toxenv}` for further reuse. Use `%{default_toxenv}` to get the default value. The `-t`/`-e` option uses [tox-current-env]'s `--print-deps-to-file` behind the scenes. Note that both `-x` and `-t` imply `-r`, because runtime dependencies are always required for testing. [tox]: https://tox.readthedocs.io/ [tox-current-env]: https://github.com/fedora-python/tox-current-env/ Running tox based tests ----------------------- In case you want to run the tests as specified in [tox] configuration, you must use `%pyproject_buildrequires` with `-t` or `-e` as explained above. Then, use the `%tox` macro in `%check`: %check %tox The macro: - Always prepends `$PATH` with `%{buildroot}%{_bindir}` - If not defined, sets `$PYTHONPATH` to `%{buildroot}%{python3_sitearch}:%{buildroot}%{python3_sitelib}` - If not defined, sets `$TOX_TESTENV_PASSENV` to `*` - Runs `tox` with `-q` (quiet), `--recreate` and `--current-env` (from [tox-current-env]) flags - Implicitly uses the tox environment name stored in `%{toxenv}` - as overridden by `%pyproject_buildrequires -t` By using the `-e` flag, you can use a different tox environment(s): %check %tox %if %{with integration_test} %tox -e %{default_toxenv}-integration %endif If you wish to provide custom `tox` flags or arguments, add them after `--`: %tox -- --flag-for-tox If you wish to pass custom `posargs` to tox, use another `--`: %tox -- --flag-for-tox -- --flag-for-posargs Or (note the two sequential `--`s): %tox -- -- --flag-for-posargs Generating the %files section ----------------------------- To generate the list of files in the `%files` section, you can use `%pyproject_save_files` after the `%pyproject_install` macro. It takes toplevel module names (i.e. the names used with `import` in Python) and stores paths for those modules and metadata for the package (dist-info directory) to a file stored at `%{pyproject_files}`. For example, if a package provides the modules `requests` and `_requests`, write: %install %pyproject_install %pyproject_save_files requests _requests To add listed files to the `%files` section, use `%files -f %{pyproject_files}`. Note that you still need to add any documentation and license manually (for now). %files -n python3-requests -f %{pyproject_files} %doc README.rst %license LICENSE You can use globs in the module names if listing them explicitly would be too tedious: %install %pyproject_install %pyproject_save_files '*requests' In fully automated environments, you can use the `*` glob to include all modules (put it in single quotes to prevent Shell from expanding it). In Fedora however, you should always use a more specific glob to avoid accidentally packaging unwanted files (for example, a top level module named `test`). Speaking about automated environments, some files cannot be classified with `%pyproject_save_files`, but it is possible to list all unclassified files by adding a special `+auto` argument. %install %pyproject_install %pyproject_save_files '*' +auto %files -n python3-requests -f %{pyproject_files} However, in Fedora packages, always list executables explicitly to avoid unintended collisions with other packages or accidental missing executables: %install %pyproject_install %pyproject_save_files requests _requests %files -n python3-requests -f %{pyproject_files} %doc README.rst %license LICENSE %{_bindir}/downloader `%pyproject_save_files` also automatically recognizes language (`*.mo`) files and marks them with `%lang` macro and appropriate language code. Note that RPM might warn about such files listed twice: warning: File listed twice: /usr/lib/python3.9/site-packages/django/conf/locale/af/LC_MESSAGES/django.mo The warning is harmless. Limitations ----------- `%pyproject_install` changes shebang lines of every Python script in `%{buildroot}%{_bindir}` to `#!%{__python3} %{py3_shbang_opt}` (`#!/usr/bin/python3 -s`). Existing Python flags in shebangs are preserved. For example `#!/usr/bin/python3 -Ru` will be updated to `#!/usr/bin/python3 -sRu`. Sometimes, this can interfere with tests that run such scripts directly by name, because in tests we usually rely on `PYTHONPATH` (and `-s` ignores that). Would this behavior be undesired for any reason, undefine `%{py3_shbang_opt}` to turn it off. Some valid Python version specifiers are not supported. [PEP 517]: https://www.python.org/dev/peps/pep-0517/ [PEP 518]: https://www.python.org/dev/peps/pep-0518/ Testing the macros ------------------ This repository has two kinds of tests. First, there is RPM `%check` section, run when building the `python-rpm-macros` package. Then there are CI tests. There is currently [no way to run Fedora CI tests locally][ci-rfe], but you can do what the tests do manually using mock. For each `$PKG.spec` in `tests/`: - clean your mock environment: mock -r fedora-rawhide-x86_64 clean - install the version of `python-rpm-macros` you're testing, e.g.: mock -r fedora-rawhide-x86_64 install .../python-rpm-macros-*.noarch.rpm - download the sources: spectool -g -R $PKG.spec - build a SRPM: rpmbuild -bs $PKG.spec - build in mock, using the path from the command above as `$SRPM`: mock -r fedora-rawhide-x86_64 -n -N $SRPM [ci-rfe]: https://pagure.io/fedora-ci/general/issue/4