setup.py --version : wrong output at first run if setup_requires is passed

Originally reported by: Alan (Bitbucket: Alan, GitHub: Alan)

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Tested with setuptools 15.2 on Python 2.7.6 (Ubuntu 14.04)

Consider the following example setup.py:

from setuptools import setup, find_packages

setup(
    name='dummy',
    description="dummy",
    long_description="dummy",
    author="Alan Franzoni",
    author_email="username@franzoni.eu",
    url="https://example.com",
    version="1.2.3",
    setup_requires = ["setuptools_git == 1.1" ],
    license="Apache-2.0",
    include_package_data=True,
    zip_safe=False

)

The first time I execute a --version command, even with the --quiet switch and redirecting stderr, I get this output:

(stenv)alan@workstation:/tmp/stbug$ python setup.py --quiet --version 2>/dev/null

Installed /tmp/stbug/.eggs/setuptools_git-1.1-py2.7.egg
1.2.3

So, the version number I was expecting as the command's output gets intermingled with a logging message.

I think the log is useful, but should either be removed (at least when passing --quiet) when using the --version command, or should be sent to stderr.

Of course, further invokations work as expected, since the setup_requires egg is already there.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/382

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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What about using instead python -m easy_install --version ?

Original comment by Alan (Bitbucket: Alan, GitHub: Alan):

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? I don't really understand the answer;

Your command returns setuptools 15.2 while I expect 1.2.3 as a result; also, AFAIK python -m works with installed packages, while the package here may not have been installed yet.

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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oh! I didn't realize that --version returned the version of the package, rather than the version of setuptools. My mistake.

I think you're right that there should be a way to suppress or filter the incidental output of setup_requires installations.

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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It will be difficult to support --quiet (or any command-line options) during the processing of setup_requires due to the order of operations.

In the setup function, you'll see that the Distribution class is constructed on line 108 but the command-line is parsed on 134, and Setuptools uses the construction of the Distribution as the hook in which to resolve setup_requires, in particular to allow additional packages to define distutils.setup_keywords entry points to provide additional attributes to the distutils.core.Distribution initializer and distutils.setup_commands entry points for the command-line parser.

So at a minimum, the order of operations is not conducive to supporting this need, and it may not be possible to achieve the desired result without modification to the foundational logic in distutils.

[jaraco]

Setup_requires is deprecated (#2823). Use pep517.meta to load metadata and pep 517 builders to build packages.