Do not set TMPDIR when exporting to requirements.txt

noxfile.py

@@ -131,7 +131,6 @@ def tests(session: Session) -> None:
         session.install("dataclasses")
 
     try:
-        session.env.pop("TMPDIR", None)
         session.run("coverage", "run", "--parallel", "-m", "pytest", *session.posargs)
     finally:
         if session.interactive:

src/nox_poetry/sessions.py

@@ -160,7 +160,9 @@ def export_requirements(self) -> Path:
         Returns:
             The path to the requirements file.
         """
-        tmpdir = Path(self.session.create_tmp())
+        tmpdir = Path(self.session.virtualenv.location) / "tmp"
+        tmpdir.mkdir(exist_ok=True)
+
         path = tmpdir / "requirements.txt"
         hashfile = tmpdir / f"{path.name}.hash"
 

tests/unit/conftest.py

@@ -8,12 +8,20 @@
 from nox.sessions import Session
 
 
+class FakeVirtualenv:
+    """Fake virtual environment."""
+
+    def __init__(self, path: Path) -> None:
+        """Initialize."""
+        self.location = str(path)
+
+
 class FakeSession:
     """Fake session."""
 
     def __init__(self, path: Path) -> None:
         """Initialize."""
-        self.path = path
+        self.virtualenv = FakeVirtualenv(path)
 
     def run(self, *args: str, **kargs: Any) -> str:
         """Run."""
@@ -23,11 +31,6 @@ def run(self, *args: str, **kargs: Any) -> str:
 
     def install(self, *args: str, **kargs: Any) -> None:
         """Install."""
-        pass
-
-    def create_tmp(self, *args: str, **kargs: Any) -> str:
-        """Create temporary directory."""
-        return str(self.path)
 
 
 @pytest.fixture

tests/unit/test_sessions.py

@@ -114,7 +114,8 @@ def proxy(session: nox.Session) -> nox_poetry.Session:
 
 def test_session_getattr(proxy: nox_poetry.Session) -> None:
     """It delegates to the real session."""
-    assert proxy.create_tmp()
+    # Fixed in https://github.com/theacodes/nox/pull/377
+    assert proxy.virtualenv.location  # type: ignore[attr-defined]
 
 
 def test_session_install(proxy: nox_poetry.Session) -> None: