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37 lines
1.0 KiB
Python
37 lines
1.0 KiB
Python
2 years ago
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"""Execute exactly this copy of pip, within a different environment.
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This file is named as it is, to ensure that this module can't be imported via
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an import statement.
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"""
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import runpy
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import sys
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import types
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from importlib.machinery import ModuleSpec, PathFinder
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from os.path import dirname
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from typing import Optional, Sequence, Union
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PIP_SOURCES_ROOT = dirname(dirname(__file__))
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class PipImportRedirectingFinder:
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@classmethod
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def find_spec(
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self,
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fullname: str,
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path: Optional[Sequence[Union[bytes, str]]] = None,
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target: Optional[types.ModuleType] = None,
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) -> Optional[ModuleSpec]:
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if fullname != "pip":
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return None
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spec = PathFinder.find_spec(fullname, [PIP_SOURCES_ROOT], target)
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assert spec, (PIP_SOURCES_ROOT, fullname)
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return spec
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sys.meta_path.insert(0, PipImportRedirectingFinder())
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assert __name__ == "__main__", "Cannot run __pip-runner__.py as a non-main module"
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runpy.run_module("pip", run_name="__main__", alter_sys=True)
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