python setuptools install_requires is ignored when overriding cmdclass

Question

I have a `setup.py` that looks like this: ``` from setuptools import setup from subprocess import call from setuptools.command.install import install class MyInstall(install): def run(self): call(["pip install -r requirements.txt --no-clean"], shell=True) install.run(self) setup( author='Attila Zseder', version='0.1', name='entity_extractor', packages=['...'], install_requires=['DAWG', 'mrjob', 'cchardet'], package_dir={'': 'modules'}, scripts=['...'], cmdclass={'install': MyInstall}, ) ``` I need `MyInstall` because I want to install some libraries from github and I didn't want to use `dependency_links` option, because it's discouraged (for example here), so I can do this with requirements.txt. When I install this package with `pip`, everything is working fine, but for some reasons I have to solve this in a way that it also works with pure `python setup.py install`. And it doesn't. When overriding `cmdclass` in `setup()` with my own class, `install_requires` seems to be ignored. As s…

Accepted Answer

The same problem just happened to me. It somehow seems like something triggers setuptools to do an 'old-style install' with `distutils`, which indeed does not support `install_requires`.

You call install.run(self) which calls run(self) in setuptools/setuptools/command/install.py, line 51-74

https://bitbucket.org/pypa/setuptools/src/8e8c50925f18eafb7e66fe020aa91a85b9a4b122/setuptools/command/install.py?at=default

```
def run(self):
    # Explicit request for old-style install?  Just do it
    if self.old_and_unmanageable or self.single_version_externally_managed:
        return _install.run(self)

# Attempt to detect whether we were called from setup() or by another
    # command.  If we were called by setup(), our caller will be the
    # 'run_command' method in 'distutils.dist', and *its* caller will be
    # the 'run_commands' method.  If we were called any other way, our
    # immediate caller *might* be 'run_command', but it won't have been
    # called by 'run_commands'.  This is slightly kludgy, but seems to
    # work.
    #
    caller = sys._getframe(2)
    caller_module = caller.f_globals.get('__name__','')
    caller_name = caller.f_code.co_name

if caller_module != 'distutils.dist' or caller_name!='run_commands':
        # We weren't called from the command line or setup(), so we
        # should run in backward-compatibility mode to support bdist_*
        # commands.
        _install.run(self)
    else:
        self.do_egg_install()
```

I'm not sure whether this behaviour is intended, but replacing

```
install.run(self)
```

with

```
install.do_egg_install()
```

should solve your problem. At least it works for me, but I would also appreciate a more detailed answer. Thanks!

python setuptools install_requires is ignored when overriding cmdclass

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