impossible to see setup.py help without installing dependencies

[exarkun]

exarkun@top:~/Projects/cryptography/trunk$ python setup.py --help                                                             
no previously-included directories found matching 'documentation/_build'
warning: build_py: byte-compiling is disabled, skipping.

warning: install_lib: byte-compiling is disabled, skipping.

zip_safe flag not set; analyzing archive contents...

Installed /home/exarkun/Projects/cryptography/trunk/six-1.5.2-py2.7.egg
Searching for cffi>=0.8
Reading https://pypi.python.org/simple/cffi/
Best match: cffi 0.8.1
Downloading https://pypi.python.org/packages/source/c/cffi/cffi-0.8.1.tar.gz#md5=1a877bf113bfe90fdefedbf9e39310d2

This is somewhat annoying. I didn't ask for anything to be installed.

[alex]

Hmmm, this seems like it's a consequence of using setup_requires, @dstufft can you confirm?

[dstufft]

I'm fairly certain it is. setup_requires can add new commands and generally modify a bunch of stuff in setup.py so I'm pretty sure setuptools just always installs them.

[alex]

That's... that's something... is there some ticket we can follow/contribute
to to make teh ssemantics of setup_requires less bonkers / replcae it
with something?

On Sun, Mar 2, 2014 at 6:33 PM, Donald Stufft notifications@github.comwrote:

I'm fairly certain it is. setup_requires can add new commands and
generally modify a bunch of stuff in setup.py so I'm pretty sure setuptools
just always installs them.

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[dstufft]

Not that i'm aware of.

[alex]

This was fixed with #1257!