NixOS/nixpkgs — pull request #5058 by ardumont (2014-11-19 23:14:08+00:00)
Title: Create a networking.proxy option

Code:
- obsolete the nix.proxy option
- add the networking.proxy option
- open a default no_proxy environment variable
- add a rsync option

Tests:
- Manual tests ok.
- AUtomatic tests added and ok

Note:
Code rebased to the latest code.
I do not know if it's a good idea.