pbr install through --find-links breaks

Trying to install openstack components using pbr breaks when using local package repository.
for example :
$ test/bin/pip install --no-index --no-deps --find-links file://tmp pbr

Ignoring indexes: http://pypi.python.org/simple/
Downloading/unpacking pbr
  Running setup.py egg_info for package pbr
    Download error on http://pypi.python.org/simple/d2to1/: timed out -- Some packages may not be found!
    Download error on http://pypi.python.org/simple/d2to1/: timed out -- Some packages may not be found!
    Couldn't find index page for 'd2to1' (maybe misspelled?)
    ...

local tmp directory content:
$ ls tmp
d2to1-0.2.10.tar.gz pbr-0.5.18.tar.gz setuptools-git-1.0.tar.gz

tried to put the find-links option in pip.conf without success

The expected behavior is that the installation process can use local files as required.