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diff --git a/src/pip/_vendor/certifi/core.py b/src/pip/_vendor/certifi/core.py
index 5d2b8cd32..b8140cf1a 100644
--- a/src/pip/_vendor/certifi/core.py
+++ b/src/pip/_vendor/certifi/core.py
@@ -8,7 +8,21 @@ This module returns the installation location of cacert.pem or its contents.
"""
import os
+
+class _PipPatchedCertificate(Exception):
+ pass
+
+
try:
+ # Return a certificate file on disk for a standalone pip zipapp running in
+ # an isolated build environment to use. Passing --cert to the standalone
+ # pip does not work since requests calls where() unconditionally on import.
+ _PIP_STANDALONE_CERT = os.environ.get("_PIP_STANDALONE_CERT")
+ if _PIP_STANDALONE_CERT:
+ def where():
+ return _PIP_STANDALONE_CERT
+ raise _PipPatchedCertificate()
+
from importlib.resources import path as get_path, read_text
_CACERT_CTX = None
@@ -33,11 +47,13 @@ try:
# We also have to hold onto the actual context manager, because
# it will do the cleanup whenever it gets garbage collected, so
# we will also store that at the global level as well.
- _CACERT_CTX = get_path("certifi", "cacert.pem")
+ _CACERT_CTX = get_path("pip._vendor.certifi", "cacert.pem")
_CACERT_PATH = str(_CACERT_CTX.__enter__())
return _CACERT_PATH
+except _PipPatchedCertificate:
+ pass
except ImportError:
# This fallback will work for Python versions prior to 3.7 that lack the
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