Time is marching on and the state of the art with python packaging has
not stood still. In Python 3.12, distutils has been removed after being
deprecated for a couple of versions. According to the Python Packaging
User Guide [1]: "However, `python setup.py` and the use of `setup.py` as a
command line tool are deprecated."
Currently, ceph provides a decent sized and growing library of python
code in `src/python-common/ceph`. It currently relies on `setup.py` and
the deprecated `python setup.py install` command. This change aims to be
the first step in moving toward a more contemporary approach so that we
don't get caught late when the older approaches really stop working.
Because ceph's primary diver of "build stuff" is CMake, there was an
existing `cmake/modules/Distutils.cmake` that invokes a `python setup.py
install` command. Rather than risk breaking older distros we add a new
`cmake/modules/PythonPackage.cmake` file that uses the PEP 517/518
[2][3] style
of packaging. I could not find some existing CMake support for this
so unfortunately I had to write this.
The approach taken is loosely based on what the rpm build process does.
It invokes pip's wheel subcommand to build a wheel (during the build
phase) and then uses pip to install the wheel to install the content
to the system.
A future commit will add conditional support for using this approach
in src/python-common.
[1] https://packaging.python.org/en/latest/discussions/setup-py-deprecated/
[2] https://peps.python.org/pep-0517/
[3] https://peps.python.org/pep-0518/
Signed-off-by: John Mulligan <jmulligan@redhat.com>
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