blob: 528ac2b49b03b55ed1dd9838e4b0b3320b2376ea (
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diff --git a/src/pip/_internal/operations/install/wheel.py b/src/pip/_internal/operations/install/wheel.py
index e7315ee4..4e36b03d 100644
--- a/src/pip/_internal/operations/install/wheel.py
+++ b/src/pip/_internal/operations/install/wheel.py
@@ -615,6 +615,8 @@ def install_wheel(
direct_url=None, # type: Optional[DirectUrl]
):
# type: (...) -> None
+ _temp_dir_for_testing = (
+ _temp_dir_for_testing or os.environ.get("NIX_PIP_INSTALL_TMPDIR"))
with TempDirectory(
path=_temp_dir_for_testing, kind="unpacked-wheel"
) as unpacked_dir, ZipFile(wheel_path, allowZip64=True) as z:
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