Add --global-option to egg_info command too

[fabio-t]

• Pip version: 9.0.1
• Python version: 2.7.12
• Operating system: Ubuntu 16.04

Description:

I maintain a package that has many dependencies, which are also conditional to a specific argument to setup.py.

If I pass this argument to pip, like this:

pip install ./ --global-option="--argument=opt1" -vvv

Then in the very first few lines I see the output:

Running command python setup.py egg_info

And the wrong list of dependencies is fetched (ie, as if I did not pass the argument at all).

If I run in the project directory the following command:

python setup.py egg_info --argument=opt1

Then the correct list of dependencies is added.

Can the specified global options be added to it, like they are for build and install?

[fabio-t]

Note: in this case I don't think the parameter should be passed to the dependencies' egg_info. I can see which this can be important for install options (prefix?), for example, but not global/build options (they would likely break dependencies).

[astrofrog]

Just a +1 for this feature request!

[chrahunt]

I'll mark this as awaiting PR and assume we'll discuss any backwards-compatibility concerns on the PR itself.

[chrahunt]

One problem with a naive implementation of this would be use cases like #6398, which pass additional commands in --global-option. We may need to introduce additional options to handle this case. In general it will probably be part of #5771 which I assume will result in a nicer framework for specifying dependency-specific info like this that impacts installation processing.