pyproject-rpm-macros/README.md

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pyproject RPM macros
====================
This is a provisional implementation of pyproject RPM macros for Fedora 30+.
These macros are useful for packaging Python projects that use the [PEP 517] `pyproject.toml` file, which specifies the package's build dependencies (including the build system, such as setuptools, flit or poetry).
Usage
-----
If your upstream sources include `pyproject.toml` and you want to use these macros, BuildRequire them:
BuildRequires: pyproject-rpm-macros
This will bring in python3-devel, so you don't need to require python3-devel explicitly.
In order to get automatic build dependencies on Fedora 31+, run `%pyproject_buildrequires` in the `%generate_buildrequires` section:
%generate_buildrequires
%pyproject_buildrequires
Only build dependencies according to [PEP 517] and [PEP 518] will be added.
All other build dependencies (such as non-Python libraries or test dependencies) still need to be specified manually.
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-macros-wheeldir/`. If you would like to save wheels somewhere else redefine `%{_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.
If the project's build system supports the [`prepare-metadata-for-build-wheel`
hook](https://www.python.org/dev/peps/pep-0517/#prepare-metadata-for-build-wheel),
this can be done using the `-r` flag:
%generate_buildrequires
%pyproject_buildrequires -r
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.
For example, if upstream suggests installing test dependencies with
`pip install mypackage[testing]`, the test deps would be generated by:
%generate_buildrequires
%pyproject_buildrequires -r -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.
Note that `-t` implies `-r`, because tox normally assumes the package is installed
including all the runtime dependencies.
The `-t`/`-e` option uses [tox-current-env]'s `--print-deps-to-file` behind the scenes.
[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 can use the `%tox` macro:
%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
**Warning:** This macro assumes you have used `%pyproject_buildrequires -t` or `-e`
in `%generate_buildrequires`. If not, you need to add:
BuildRequires: python3dist(tox-current-env)
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.
Extras are currently ignored.
Some valid Python version specifiers are not supported.
The `-x` flag does not yet support multiple (comma-separated) extras.
[PEP 517]: https://www.python.org/dev/peps/pep-0517/
[PEP 518]: https://www.python.org/dev/peps/pep-0518/