The python2nix from proger

python2nix's Introduction

python2nix

Put a PyPI package name in, get a Nix expression out to add to nixpkgs or your private build scripts.

Quick start

Choose your favorite package from PyPI (like https://pypi.python.org/pypi/thumbor)
Feed its name to python2nix: python -mpython2nix thumbor
Use code from stdout as the base for Nix expression (it may need manual tweaks).

nix-shell -p pythonPackages.virtualenv
virtualenv env
env/bin/pip install -r pip.requirements
mkdir -p env/build
env/bin/python -mpython2nix thumbor | tee thumbor.nix

Known issues

You will need to convert md5 to sha256 manually.
Tested only with pip==1.5.6.
May ignore lots of the metadata (e.g. doesn't handle tests_require).

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python2nix's Issues

Use sha256 over md5

md5 is deprecated, let's use sha256 hash for source files :)

Broken with latest pip

This tool is broken with latest pip, see NixOS/nixpkgs#30887 (comment)

This is sadly missing from nixpkgs so I cloned the repo and then tried to execute it from a nix-shell with nix-shell -p pythonPackages.pip -p pythonPackages.requests -p python -p setuptools. I had to change the from pip._vendor import pkg_resources to import pkg_resources so it would find the one from setuptools, and then it just doesn't work.

The error is:

package_to_info failed: <Response [404]>
Traceback (most recent call last):
  File "./python2nix.py", line 104, in <module>
    print info_to_expr(package_to_info(sys.argv[1]))
  File "./python2nix.py", line 76, in package_to_info
    raise e
ValueError: No JSON object could be decoded

Thoughts?

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