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76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
2 years ago
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# The following comment should be removed at some point in the future.
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# mypy: strict-optional=False
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import os
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import re
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import sys
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from typing import Optional
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from pip._internal.locations import site_packages, user_site
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from pip._internal.utils.virtualenv import (
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running_under_virtualenv,
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virtualenv_no_global,
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)
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__all__ = [
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"egg_link_path_from_sys_path",
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"egg_link_path_from_location",
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]
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def _egg_link_name(raw_name: str) -> str:
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"""
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Convert a Name metadata value to a .egg-link name, by applying
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the same substitution as pkg_resources's safe_name function.
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Note: we cannot use canonicalize_name because it has a different logic.
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"""
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return re.sub("[^A-Za-z0-9.]+", "-", raw_name) + ".egg-link"
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def egg_link_path_from_sys_path(raw_name: str) -> Optional[str]:
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"""
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Look for a .egg-link file for project name, by walking sys.path.
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"""
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egg_link_name = _egg_link_name(raw_name)
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for path_item in sys.path:
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egg_link = os.path.join(path_item, egg_link_name)
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if os.path.isfile(egg_link):
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return egg_link
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return None
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def egg_link_path_from_location(raw_name: str) -> Optional[str]:
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"""
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Return the path for the .egg-link file if it exists, otherwise, None.
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There's 3 scenarios:
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1) not in a virtualenv
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try to find in site.USER_SITE, then site_packages
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2) in a no-global virtualenv
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try to find in site_packages
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3) in a yes-global virtualenv
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try to find in site_packages, then site.USER_SITE
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(don't look in global location)
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For #1 and #3, there could be odd cases, where there's an egg-link in 2
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locations.
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This method will just return the first one found.
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"""
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sites = []
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if running_under_virtualenv():
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sites.append(site_packages)
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if not virtualenv_no_global() and user_site:
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sites.append(user_site)
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else:
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if user_site:
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sites.append(user_site)
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sites.append(site_packages)
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egg_link_name = _egg_link_name(raw_name)
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for site in sites:
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egglink = os.path.join(site, egg_link_name)
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if os.path.isfile(egglink):
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return egglink
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return None
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