Setup.py, , setuptools, cmdclass - Custom commands not working

Question

I am trying to create a directory upon a package installation. The function to create the directory, by itself, successfully creates it. Additionally, when I run "python3.7 setup.py install", the directory is created.

Why does this not work when using pip though? I don't see any errors. When I added print statements, I do not see them.

I have chosen to use setuptools' 'bdist_egg' function instead of the 'install' function for reasons found in here:

Running custom setuptools build during install

from sys import platform
from setuptools import setup
from os import mkdir, chmod, path
from setuptools.command.bdist_egg import bdist_egg as _bdist_egg

class OverrideInstall(_bdist_egg):

    def run(self):
        _bdist_egg.run(self)

        # create log directory
        log = "/var/log/FOO"
        mode = 0o777
        if not path.exists(log):
            mkdir(log)
            chmod(log, mode)

setup(
    name='cox-nams',
    version='FOO',
    description='FOO',

    <-- output omitted for brevity / security>

    cmdclass={"bdist_egg": OverrideInstall},
)

"Why does this not work when using pip?" Because pip doesn't run python setup.py install. You cannot have a post-installation code with pip. — phd
– phd, Commented Sep 12, 2019 at 22:48
Thanks for the reply. How is it recommended to perform these simple installation tasks? I guess the modules being installed could perform a check and install if they're not there. Is there anyway to do this within pip so that the install and actual code are kept separate? — user3746195
– user3746195, Commented Sep 13, 2019 at 15:20
"the modules being installed could perform a check and install if they're not there" Also wouldn't work because such programs seldom run under root and you need to be root to create a directory under /var/log. For system-wide installation you better create a real system package (RPM or DEB). For virtualenv you can do whatever you want but don't touch system directories. — phd
– phd, Commented Sep 13, 2019 at 17:09
I was trying to mimic a package that is very similar to mine. In fact, I was cutting/pasting from it. github.com/Juniper/jsnapy/blob/master/setup.py . Do you know how they are able to do this and why it is different than what I am doing? There is also an 'install-ubuntu-debian' page they have which shows a 'pip install' as the instructions. — user3746195
– user3746195, Commented Sep 13, 2019 at 18:22
I don't think it does. I just ran pip install jsnappy under a non-root user — the package installed (into a virtualenv), but non of /etc/jsnappy or /var/log/jsnappy was created and no error was reported. — phd
– phd, Commented Sep 13, 2019 at 20:22

user3746195 · Accepted Answer · 2019-09-14 18:42:32Z

1

Apparently not supported with pip install.

answered Sep 14, 2019 at 18:42

user3746195

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