pyproject-rpm-macros/README.md
Miro Hrončok 262f6d3bc3 %pyproject_buildrequires -x now implies -r
The usage without -r errored anyway, this way instead of forcing the user to add it,
we do it ourselves.

Machines stealing human's labor, yet again.
2020-07-16 13:38:50 +02:00

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pyproject RPM macros
====================
This is a provisional implementation of pyproject RPM macros for Fedora.
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-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 -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 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)
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 environmets, you can use the `*` glob to include all modules. 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, it is possible to also list all executables in `/usr/bin` by adding a special `+bindir` argument.
%install
%pyproject_install
%pyproject_save_files * +bindir
%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
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/
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