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Pip Detection

Requirements

Pip detection depends on the following to successfully run:

  • Python 2 or Python 3
  • Internet connection
  • One or more setup.py or requirements.txt files

Detection strategy

Pip detection is performed by running the following code snippet on every setup.py:

    import distutils.core;
    setup = distutils.core.run_setup({setup.py});
    print(setup.install_requires);

The code above allows Pip detection to detect any runtime dependencies.

requirements.txt files are parsed; a Git component is created for every git+ url.

For every top level component, Pip detection makes http calls to Pip in order to determine latest version available, as well as to resolve the dependency tree by parsing the METADATA file on a given release's bdist_wheel or bdist_egg.

Full dependency graph generation is supported.

Known limitations

Dev dependency tagging is not supported.

Pip detection will not run if python is unavailable.

If no bdist_wheel or bdist_egg are available for a given component, dependencies will not be fetched.

If no internet connection or a component cannot be found in Pypi, said component and its dependencies will be skipped.

Environment Variables

The environment variable PyPiMaxCacheEntries is used to control the size of the in-memory LRU cache that caches responses from PyPi. The default value is 128.