[Distutils] Auto configuration

[M.-A. Lemburg]

Bastian Kleineidam wrote:
> 
> >How can I enable running the "config" command prior to
> >all "build" commands ?
> Suppose your custom "config" command writes out a file "configdata". When
> running the install command you can check if this file exists and if not
> raise an exception which demands to run "python setup.py config":
> 
> class MyDistribution(Distribution):
>     def __init__(self, attrs=None):
>         Distribution.__init__(self, attrs=attrs)
>         self.config_file = "configdata"
> 
>     def run_commands(self):
>         if "config" not in self.commands:
>             if not os.path.exists(self.config_file):
>                 raise SystemExit, "please run 'python setup.py config'"
>         Distribution.run_commands(self)
> 
> class MyConfig(config):
>     def run(self):
>         # ... write "configdata" file

Thanks for the example. What I was thinking of is a little
different though: I have a configuration class which will
do some environment testing in order to determine flags
and options for the build_ext class. Now in order to have
this information available before the build I need to 
assure that the config command is executed before the
build step.

After some hacking I found that the following trick enables
this:

from distutils.command.config import config
from distutils.command.build import build

class autoconf(config):

    def run(self):

	...config code...
        build_ext = self.distribution.reinitialize_command('build_ext')
        # Set options
        build_ext.define = mydefines

class autoconf_build(build):

    def run(self):

        self.run_command('autoconf')
        build.run(self)

and then in setup():

       cmdclass = {'autoconf': autoconf,
                   'build': autoconf_build},

With this setup you can execute "setup.py bdist_rpm" and the
autoconf command will get executed automatically or you can
run "setup.py autoconf --autoconf-option build" to pass
additional options to the autoconf command. 

Unfortunately, bdist_rpm doesn't seem to inherit the command
options you passed to the setup.py script -- the build is
done in a separate process which is invoked by RPM rather
than from the original setup.py process.

Thanks,
-- 
Marc-Andre Lemburg
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