How to install local wheels whose requirement specifiers are VCS project urls?

[RussellLuo]

From the documentation, I learned this:

To build wheels for your requirements and all their dependencies to a local directory:

pip install wheel
pip wheel --wheel-dir=/local/wheels -r requirements.txt

And then to install those requirements just using your local directory of wheels (and not from PyPI):

pip install --no-index --find-links=/local/wheels -r requirements.txt

The pip install --no-index --find-links=/local/wheels -r requirements.txt command works well if all dependencies in the requirements.txt are in the format of PyPI requirement specifiers:

flask
requests

But if any dependency in the requirements.txt is in the form of VCS project url, which is reasonable for non-PyPI or development-version packages. Like this:

git+https://github.com/mitsuhiko/flask.git#egg=flask
git+https://github.com/kennethreitz/requests.git#egg=requests

The pip install command will download packages by cloning their repositories (as the pip wheel command has done), instead of using the local wheels.

How to fix it?

[RussellLuo]

For those who encountered the same issue, I have figured out a solution:

$ WHEELS=$(cd /local/wheels; ls -1 *.whl | awk -F - '{ gsub("_", "-", $1); print $1 }' | uniq)
$ pip install --no-index --find-links=/local/wheels $WHEELS

[dstufft]

Closing as a duplicate of #3355/