pypa / pypa/setuptools

pkg_resources merrily adds site-packages to the front of sys.path

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bug major
Dominant language
Python
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Description

Originally reported by: ncoghlan (Bitbucket: ncoghlan, GitHub: ncoghlan)


If a requirement in __main__.__requires__ is met by a package in site-packages, pkg_resources will happily reinsert site-packages at the front of sys.path.

This breaks the world when working on software where a previous version is installed as a system package.


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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing pkg_resources handling of main.requires and the code that modifies sys.path when a requirement is found in site-packages. Done means a satisfied requirement no longer moves site-packages ahead of the existing path in the reported scenario, with coverage for that behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
build-system
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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