Consider system packages as installed if the venv includes them

src/poetry/utils/env/base_env.py

@@ -219,8 +219,11 @@ def platlib(self) -> Path:
 
  return self._platlib
 
+ def _get_lib_dirs(self) -> list[Path]:
+ return [self.purelib, self.platlib]
+
  def is_path_relative_to_lib(self, path: Path) -> bool:
- for lib_path in [self.purelib, self.platlib]:
+ for lib_path in self._get_lib_dirs():
  with contextlib.suppress(ValueError):
  path.relative_to(lib_path)
  return True

src/poetry/utils/env/system_env.py

@@ -2,6 +2,7 @@
 
 import os
 import platform
+import site
 import sys
 import sysconfig
 
@@ -87,3 +88,6 @@ def get_pip_version(self) -> Version:
 
  def is_venv(self) -> bool:
  return self._path != self._base
+
+ def _get_lib_dirs(self) -> list[Path]:
+ return super()._get_lib_dirs() + [Path(d) for d in site.getsitepackages()]

src/poetry/utils/env/virtual_env.py

@@ -3,6 +3,7 @@
 import json
 import os
 import re
+import sys
 
 from contextlib import contextmanager
 from copy import deepcopy
@@ -20,6 +21,7 @@
 from poetry.utils.env.script_strings import GET_PYTHON_VERSION
 from poetry.utils.env.script_strings import GET_SYS_PATH
 from poetry.utils.env.script_strings import GET_SYS_TAGS
+from poetry.utils.env.system_env import SystemEnv
 
 
 if TYPE_CHECKING:
@@ -133,3 +135,14 @@ def temp_environ(self) -> Iterator[None]:
 
  def _updated_path(self) -> str:
  return os.pathsep.join([str(self._bin_dir), os.environ.get("PATH", "")])
+
+ 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:
+ system_env = SystemEnv(Path(sys.prefix))
+ return (
+ self.includes_system_site_packages()
+ and system_env.is_path_relative_to_lib(path)
+ ) or super().is_path_relative_to_lib(path)

tests/utils/test_env.py

@@ -1,6 +1,8 @@
 from __future__ import annotations
 
+import contextlib
 import os
+import site
 import subprocess
 import sys
 
@@ -18,6 +20,7 @@
 from poetry.repositories.installed_repository import InstalledRepository
 from poetry.toml.file import TOMLFile
 from poetry.utils._compat import WINDOWS
+from poetry.utils._compat import metadata
 from poetry.utils.env import GET_BASE_PREFIX
 from poetry.utils.env import GET_PYTHON_VERSION_ONELINER
 from poetry.utils.env import EnvCommandError
@@ -1462,8 +1465,25 @@ def test_env_system_packages(tmp_path: Path, poetry: Poetry) -> None:
  pyvenv_cfg = venv_path / "pyvenv.cfg"
 
  EnvManager(poetry).build_venv(path=venv_path, flags={"system-site-packages": True})
+ env = VirtualEnv(venv_path)
 
  assert "include-system-site-packages = true" in pyvenv_cfg.read_text()
+ assert env.includes_system_site_packages()
+
+
+def test_env_system_packages_are_relative_to_lib(
+ tmp_path: Path, poetry: Poetry
+) -> None:
+ venv_path = tmp_path / "venv"
+ EnvManager(poetry).build_venv(path=venv_path, flags={"system-site-packages": True})
+ env = VirtualEnv(venv_path)
+ site_dir = Path(site.getsitepackages()[-1])
+ for dist in metadata.distributions():
+ # Emulate is_relative_to, only available in 3.9+
+ with contextlib.suppress(ValueError):
+ dist._path.relative_to(site_dir) # type: ignore[attr-defined]
+ break
+ assert env.is_path_relative_to_lib(dist._path) # type: ignore[attr-defined]
 
 
 @pytest.mark.parametrize(