How I can make apt-get install to my virtualenv?
It it's possible, of course.
For example - I can download python-dbus like this: $ sudo apt-get download python-dbus
But what I should to do next, with this .deb package in my current virtualenv?
Answer
If you really need to do it this way, you can just copy the files that get installed globally directly into your virtualenv. For example I couldn't get pycurl working since the required libraries weren't installing, but apt-get install python-pycurl did. So I did the following:
sudo apt-get install python-pycurl
cp /usr/lib/python2.7/dist-packages/pycurl* ~/.virtualenvs/myenv/lib/python2.7/site-packages/
The install said it was adding it to /usr/lib/python2.7. So I looked in that directory for a site-packages or dist-packages with pycurl, after looking at the files I copied them into my virtualenv. You'd have to also copy any executables from bin into your virtualenv's bin directory.
Also, running a pip install -r requirements.txt successfully found pycurl in there and just skipped over it as if I had installed it via pip.