[packaging] Added conditional dependencies for wheel

[ritwickdsouza]

References #72

[ritwickdsouza]

@nemesisdesign I ran the tests locally on a clean virtualenv and it passed.
On travis I'm getting this ImportError: No module named 'jinja2'

[nemesifier]

Not sure what causes the problem on travis, I'm testing.

[nemesifier]

not sure this block of code can be removed, it may still be required for non-wheel packages.

[nemesifier]

I'm testing this.

[ritwickdsouza]

Ohh.

[nemesifier]

no, I'm wrong. Ignore this! Good work.

[nemesifier]

I was wrong again, that bit of code is necessary for non-wheel packages (old fashion tar.gz).

[ritwickdsouza]

How did you test it ?

[nemesifier]

you can test it by generating the packages with:

python setup.py sdist bdist_wheel

Then create 2 new virtualenvs, one with python2 and one with python3, and in each virtualenv you do:

pip install -U pip wheel setuptools
pip install -r requirements-test.txt

Then, for each virtualenv you do:

cd dist/
pip install ./<name-of-tar.gz-package>
cd ..
./runtests.py

I did the same also for the wheel package (uninstalling the dependencies and reinstalling the package).

Without this test we would risk to release a broken package and would piss many people off!

[ritwickdsouza]

Good to know. 👍

[nemesifier]

I can reproduce the travis issue wit the following procedure:

git clone https://github.com/ritwickdsouza/netjsonconfig.git tmp-netjsonconfig
cd tmp-netjsonconfig
git checkout cond-depend-wheel
mkvirtualenv tmp --python=/usr/bin/python3
pip install -U pip wheel setuptools
python setup.py develop
pip install -r requirements-test.txt
nosetests

[nemesifier]

@ritwickdsouza keep me up to date (I suppose you are busy with your exams)

[coveralls]

Coverage remained the same at 100.0% when pulling 0badc8b on ritwickdsouza:cond-depend-wheel into 6f15fa5 on openwisp:master.

[ritwickdsouza]

@nemesisdesign Yeah, was busy with exams. Anyway I had introduced the bug by mistake. Works fine now.

[coveralls]

Coverage remained the same at 100.0% when pulling 15c435b on ritwickdsouza:cond-depend-wheel into e7513af on openwisp:master.

[nemesifier]

Also, please rebase from master with:

git checkout master
git pull https://github.com/openwisp/netjsonconfig.git master
git checkout cond-depend-wheel
git rebase master

[coveralls]

Coverage remained the same at 100.0% when pulling 10027ad on ritwickdsouza:cond-depend-wheel into e7513af on openwisp:master.

[coveralls]

Coverage remained the same at 100.0% when pulling ce4d39b on ritwickdsouza:cond-depend-wheel into e7513af on openwisp:master.

[nemesifier]

Great, thanks! 👍