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setuptools is a package that replaces the python stdlib 'distutils'. It is generally installed by all venv-creating tools "by default". It isn't actually needed at runtime for the qemu package, so our own setup.cfg does not mention it as a dependency. However, tox will create virtual environments that include it, and will upgrade it to the very latest version. the 'venv' tool will also include whichever version your host system happens to have. Unfortunately, setuptools version 60.0.0 and above include a hack to forcibly overwrite python's built-in distutils. The pylint tool that we use to run code analysis checks on this package relies on distutils and suffers regressions when setuptools >= 60.0.0 is present at all, see https://github.com/PyCQA/pylint/issues/5704 Instruct tox and the 'check-dev' targets to avoid setuptools packages that are too new, for now. Pipenv is unaffected, because setuptools 60 does not offer Python 3.6 support, and our pipenv config is pinned against Python 3.6. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Beraldo Leal <bleal@redhat.com> Reviewed-by: Cleber Rosa <crosa@redhat.com> Tested-by: Cleber Rosa <crosa@redhat.com> Message-id: 20220121005221.142236-1-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com> |
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qemu | ||
tests | ||
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avocado.cfg | ||
Makefile | ||
MANIFEST.in | ||
PACKAGE.rst | ||
Pipfile | ||
Pipfile.lock | ||
README.rst | ||
setup.cfg | ||
setup.py | ||
VERSION |
QEMU Python Tooling =================== This directory houses Python tooling used by the QEMU project to build, configure, and test QEMU. It is organized by namespace (``qemu``), and then by package (e.g. ``qemu/machine``, ``qemu/qmp``, etc). ``setup.py`` is used by ``pip`` to install this tooling to the current environment. ``setup.cfg`` provides the packaging configuration used by ``setup.py``. You will generally invoke it by doing one of the following: 1. ``pip3 install .`` will install these packages to your current environment. If you are inside a virtual environment, they will install there. If you are not, it will attempt to install to the global environment, which is **not recommended**. 2. ``pip3 install --user .`` will install these packages to your user's local python packages. If you are inside of a virtual environment, this will fail; you want the first invocation above. If you append the ``--editable`` or ``-e`` argument to either invocation above, pip will install in "editable" mode. This installs the package as a forwarder ("qemu.egg-link") that points to the source tree. In so doing, the installed package always reflects the latest version in your source tree. Installing ".[devel]" instead of "." will additionally pull in required packages for testing this package. They are not runtime requirements, and are not needed to simply use these libraries. Running ``make develop`` will pull in all testing dependencies and install QEMU in editable mode to the current environment. (It is a shortcut for ``pip3 install -e .[devel]``.) See `Installing packages using pip and virtual environments <https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/>`_ for more information. Using these packages without installing them -------------------------------------------- These packages may be used without installing them first, by using one of two tricks: 1. Set your PYTHONPATH environment variable to include this source directory, e.g. ``~/src/qemu/python``. See https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH 2. Inside a Python script, use ``sys.path`` to forcibly include a search path prior to importing the ``qemu`` namespace. See https://docs.python.org/3/library/sys.html#sys.path A strong downside to both approaches is that they generally interfere with static analysis tools being able to locate and analyze the code being imported. Package installation also normally provides executable console scripts, so that tools like ``qmp-shell`` are always available via $PATH. To invoke them without installation, you can invoke e.g.: ``> PYTHONPATH=~/src/qemu/python python3 -m qemu.qmp.qmp_shell`` The mappings between console script name and python module path can be found in ``setup.cfg``. Files in this directory ----------------------- - ``qemu/`` Python 'qemu' namespace package source directory. - ``tests/`` Python package tests directory. - ``avocado.cfg`` Configuration for the Avocado test-runner. Used by ``make check`` et al. - ``Makefile`` provides some common testing/installation invocations. Try ``make help`` to see available targets. - ``MANIFEST.in`` is read by python setuptools, it specifies additional files that should be included by a source distribution. - ``PACKAGE.rst`` is used as the README file that is visible on PyPI.org. - ``Pipfile`` is used by Pipenv to generate ``Pipfile.lock``. - ``Pipfile.lock`` is a set of pinned package dependencies that this package is tested under in our CI suite. It is used by ``make check-pipenv``. - ``README.rst`` you are here! - ``VERSION`` contains the PEP-440 compliant version used to describe this package; it is referenced by ``setup.cfg``. - ``setup.cfg`` houses setuptools package configuration. - ``setup.py`` is the setuptools installer used by pip; See above.