Use --extra-index-url for resolution

[kennethreitz]

• Fixes Public dependencies are not resolved properly on private packages #1539
• Currently writes the wrong index name to the lockfile
• Currently fails one round before succeeding

[jonlil]

I think this caused issues with pipenv install --skip-lock

See this output

pipenv install --verbose --skip-lock                                                                                                                                                         1 ↵
Installing dependencies from Pipfile…
Installing 'uwsgi==2.0.17 --extra-index-url https://private.example.com/simple'

WARNING: Invalid requirement, parse error at "'--extra-'"
ABORTING INSTALL... You will have to reinstall any packages that failed to install.
You may have to manually run pipenv lock when you are finished.

Without knowing your implementation, I guess the problem is how you pass the arguments to pip.

["pip", "install", "--extra-index-url", "https://private.example.com/simple", "uwsgi==2.0.17"]

[techalchemy]

@jonlil this is a pull request, not an issue

if you have a bug, please report it in a new issue

Without knowing your implementation, I guess the problem is how you pass the arguments to pip.

This is wrong, you are using this incorrectly, please read the documentation.

[jonlil]

I'm impressed that you know how I'm using it!

I'm aware that this is a PR, thought It should be more helpful to comment on the actual changes then on some random issue needing. Feel free to investigate on your own. I will not!

[techalchemy]

@jonlil edit this looks like an actual bug now that I reread, can you open an issue

[techalchemy]

also apologies for the assumptions