[Distutils] Package in both setup_requires and install_requires will not be installed

[Phillip J. Eby]

At 09:26 PM 10/13/2007 +0100, Michael Hoffman wrote:
>Phillip J. Eby wrote:
> > At 12:42 AM 9/18/2007 +0100, Michael Hoffman wrote:
> >> Michael Hoffman wrote:
> >>
> >>> If you specify a package in setup_requires it will be built in the
> >>> current directory. But even if it is in install_requires as well, it
> >>> won't be installed because the requirement is already satisfied at setup
> >>> time by the package in the build directory.
> >> I came up with this workaround:
> >>
> >>from setuptools.command.install import install
> >> class SubprocessEasyInstall(install):
> >>      def run(self):
> >>          install.run(self)
> >>
> >>          args = [sys.executable, "-m", "easy_install"] + setup_requires
> >>          check_call(args)
> >>
> >> And in the setup() call, ensure you include:
> >>
> >> cmdclass=dict(install=SubprocessEasyInstall)
> >>
> >> This will easy_install the setup_requires in a separate process which is
> >> unpolluted by the distributions already downloaded during setup.
> >
> > Don't do this.  It will do evil things if for example someone runs
> > "setup.py install --help", or uses indeed any options or arguments to
> > 'install' at all.
> >
> > It will also break the bdist_rpm, bdist_wininst, and other commands,
> > which invoke 'install' as a subcommand, with various options set.
>
>Would you like to suggest a better workaround?

Well, you could do something similar, but look at do_egg_install in 
setuptools.command.install to see how to construct a good command 
line for the child process.

The full fix is going to be a lot more complicated, unfortunately.