VCS installation doesn't prompt for authentication

Environment

• pip version: 10.0.1
• Python version: 2.7 and 3.6
• OS: Windows 10

Description

When trying to install a package from a git or mercurial repository that requires HTTP authentication, pip 10 will always fail the installation due to authentication errors.

Expected behavior

pip should prompt the user to enter their HTTP credentials, just as it did on version 9 and prior.

How to Reproduce

pip install -e hg+https://example.com/private-repo@d1161a2201f22f9b729935100a13d8177c1d9fe0#egg=some_package

Output

Cloning hg https://example.com/private-repo (to revision d1161a2201f22f9b729935100a13d8177c1d9fe0) to c:\some\path
abort: http authorization required for https://example.com/private-repo
Command "hg clone --noupdate -q https://example.com/private-repo c:\some\path" failed with error code 255 in None

[cjerdonek]

If I hard code the auth information in the requirements file then only one account would be able to access the repo (and also their credentials would be exposed to everyone in the project).

How about using the new environment variable feature? https://pip.pypa.io/en/stable/reference/pip_install/#using-environment-variables

[lock[bot]]

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