Cache the includes_system_site_packages property

Signed-off-by: Aurélien Bompard <[email protected]>

src/poetry/utils/env/virtual_env.py

@@ -7,6 +7,7 @@
 
 from contextlib import contextmanager
 from copy import deepcopy
+from functools import cached_property
 from pathlib import Path
 from typing import TYPE_CHECKING
 from typing import Any
@@ -136,12 +137,13 @@ def temp_environ(self) -> Iterator[None]:
     def _updated_path(self) -> str:
         return os.pathsep.join([str(self._bin_dir), os.environ.get("PATH", "")])
 
+    @cached_property
     def includes_system_site_packages(self) -> bool:
         pyvenv_cfg = self._path / "pyvenv.cfg"
         return "include-system-site-packages = true" in pyvenv_cfg.read_text()
 
     def is_path_relative_to_lib(self, path: Path) -> bool:
         return super().is_path_relative_to_lib(path) or (
-            self.includes_system_site_packages()
+            self.includes_system_site_packages
             and SystemEnv(Path(sys.prefix)).is_path_relative_to_lib(path)
         )

tests/utils/test_env.py

@@ -1468,7 +1468,7 @@ def test_env_system_packages(tmp_path: Path, poetry: Poetry) -> None:
     env = VirtualEnv(venv_path)
 
     assert "include-system-site-packages = true" in pyvenv_cfg.read_text()
-    assert env.includes_system_site_packages()
+    assert env.includes_system_site_packages
 
 
 def test_env_system_packages_are_relative_to_lib(