forked from mirrors/nixpkgs
bd47c5721f
This is needed in case of `python.buildEnv` to make sure sys.executable does not point to the unwrapped executable.
27 lines
938 B
Python
27 lines
938 B
Python
"""
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This is a Nix-specific module for discovering modules built with Nix.
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The module recursively adds paths that are on `NIX_PYTHONPATH` to `sys.path`. In
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order to process possible `.pth` files `site.addsitedir` is used.
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The paths listed in `PYTHONPATH` are added to `sys.path` afterwards, but they
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will be added before the entries we add here and thus take precedence.
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Note the `NIX_PYTHONPATH` environment variable is unset in order to prevent leakage.
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Similarly, this module listens to the environment variable `NIX_PYTHONEXECUTABLE`
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and sets `sys.executable` to its value.
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"""
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import site
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import sys
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import os
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import functools
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paths = os.environ.pop('NIX_PYTHONPATH', None)
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if paths:
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functools.reduce(lambda k, p: site.addsitedir(p, k), paths.split(':'), site._init_pathinfo())
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executable = os.environ.pop('NIX_PYTHONEXECUTABLE', None)
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if 'PYTHONEXECUTABLE' not in os.environ and executable:
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sys.executable = executable
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