[TIP] tox: force sdist installation

[Alexander Steinert]

Dear list,

tox doesn't install my sdist if it has been installed by a previous tox run and
its version doesn't increase. Is there a way to let tox call pip install with
--upgrade or --ignore-installed only for the sdist to be used, not for the
dependencies?

I experienced the mentioned behaviour when I called sphinx-build via tox (see
tox.ini section below, Sphinx' conf.py is in doc/ !). Sphinx imports my package
from the installed sdist. That is nice. However, the generated docs won't
reflect my latest changes until I delete the virtual environment or uninstall
the installed sdist.

TIA
Stony


[testenv:doc]
basepython = python2.6
commands =
    sphinx-build -c doc -W -b html [] . doc/_build/html
deps =
    {toxinidir}/lib/docutils-0.7.tar.gz
    {toxinidir}/lib/Jinja2-2.5.5.tar.gz
    {toxinidir}/lib/Pygments-1.4.tar.gz
    {toxinidir}/lib/Sphinx-1.0.7.tar.gz