Using a local cache for pip packages

I do a lot of development without an internet connection¹, so being able to install packages into a virtual environment without a connection to PyPI is pretty useful.

I've got a couple of aliases in my .bashrc which help with this²:

alias pipcache='pip install --download ${HOME}/.pip-packages'
alias pipinstall='pip install --no-index --find-links=file://${HOME}/.pip-packages/'

The first downloads the packages to my local cache, the second installs them from the cache.

Usage is probably fairly obvious:

pipcache Django==1.5 # Put Django-1.5.tar.gz in ~/.pip-packages
pipinstall Django==1.5 # Install ~/.pip-packages/Django-1.5.tar.gz

pipcache -r requirements.txt # Cache all the requirements of a project
pipinstall -r requirements.txt # Install all requirements from the cache

It's perfectly possible to cache multiple versions of the same package³, which is useful for being able to test upgrading to newer releases, whilst still being able to revert to the previously pinned package if you find nothing works.

Since I mostly use a fairly small set of packages, this means I can start up a brand new virtualenv and I'm very likely to have everything I need without going to PyPI. Not having to download large packages ::...

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