Fix tox_root propagation to work_dir

docs/changelog/2933.bugfix.rst

@@ -0,0 +1 @@
+Fix issue where ``work_dir`` was not correctly including ``tox_root`` for test runs

src/tox/config/sets.py

@@ -188,23 +188,17 @@ def register_config(self) -> None:
             desc="the root directory (where the configuration file is found)",
         )
 
-        def work_dir_builder(conf: Config, env_name: str | None) -> Path:  # noqa: U100
-            return (conf.work_dir if conf.work_dir is not None else cast(Path, self["tox_root"])) / ".tox"
-
-        def work_dir_post_process(value: Path) -> Path:
-            return self._conf.work_dir if self._conf.options.work_dir else value
-
         self.add_config(
             keys=["work_dir", "toxworkdir"],
             of_type=Path,
-            default=work_dir_builder,
-            post_process=work_dir_post_process,
+            default=lambda *_: self["tox_root"] / ".tox",  # noqa: U101
+            post_process=lambda dir: self._conf.work_dir if self._conf.options.work_dir else dir,
             desc="working directory",
         )
         self.add_config(
             keys=["temp_dir"],
             of_type=Path,
-            default=lambda conf, _: cast(Path, self["work_dir"]) / ".tmp",  # noqa: U100, U101
+            default=lambda *_: self["work_dir"] / ".tmp",  # noqa: U101
             desc="a folder for temporary files (is not cleaned at start)",
         )
         self.add_constant("host_python", "the host python executable path", sys.executable)

tests/session/cmd/test_sequential.py

@@ -280,7 +280,7 @@ def test_skip_pkg_install(tox_project: ToxProjectCreator, demo_pkg_inline: Path)
 def test_skip_develop_mode(tox_project: ToxProjectCreator, demo_pkg_setuptools: Path) -> None:
     proj = tox_project({"tox.ini": "[testenv]\npackage=wheel\n"})
     execute_calls = proj.patch_execute(lambda r: 0 if "install" in r.run_id else None)
-    result = proj.run("--root", str(demo_pkg_setuptools), "--develop")
+    result = proj.run("--root", str(demo_pkg_setuptools), "--develop", "--workdir", str(proj.path / ".tox"))
     result.assert_success()
     calls = [(i[0][0].conf.name, i[0][3].run_id) for i in execute_calls.call_args_list]
     expected = [
@@ -430,7 +430,7 @@ def test_sequential_inserted_env_vars(tox_project: ToxProjectCreator, demo_pkg_i
                         k.startswith("TOX_") or k == "VIRTUAL_ENV"]'
     """
     project = tox_project({"tox.ini": ini})
-    result = project.run("r", "--root", str(demo_pkg_inline))
+    result = project.run("r", "--root", str(demo_pkg_inline), "--workdir", str(project.path / ".tox"))
     result.assert_success()
 
     assert re.search(f"TOX_PACKAGE={re.escape(str(project.path))}.*.tar.gz{os.linesep}", result.out)

tests/test_run.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from pathlib import Path
+
 import pytest
 from pytest_mock import MockerFixture
 
@@ -22,7 +24,77 @@ def test_re_raises_on_unexpected_exit(mocker: MockerFixture) -> None:
         run()
 
 
-def test_custom_work_dir(tox_project: ToxProjectCreator) -> None:
+def test_custom_work_dir(tox_project: ToxProjectCreator, tmp_path: Path) -> None:
+    project = tox_project({})
+
+    expected_tox_root = project.path
+    expected_work_dir = tmp_path
+
+    outcome = project.run("c", "--workdir", str(expected_work_dir))
+    outcome.assert_success()
+
+    assert outcome.state.conf.options.work_dir == expected_work_dir, "should parse the --workdir argument"
+
+    assert outcome.state.conf.core["work_dir"], f"should set work_dir to {expected_work_dir}"
+
+    assert outcome.state.conf.core["tox_root"] == expected_tox_root, "should not update the value of tox_root"
+    assert outcome.state.conf.core["work_dir"] != (
+        expected_tox_root / ".tox"
+    ), "should explicitly demonstrate that tox_root and work_dir are decoupled"
+
+    # should update config values that depend on work_dir
+    assert outcome.state.conf.core["temp_dir"] == expected_work_dir / ".tmp"
+
+    env_conf = outcome.state.conf.get_env("py")
+
+    assert env_conf["env_dir"] == expected_work_dir / "py"
+    assert env_conf["env_log_dir"] == expected_work_dir / "py" / "log"
+    assert env_conf["env_tmp_dir"] == expected_work_dir / "py" / "tmp"
+
+
+def test_custom_root_dir(tox_project: ToxProjectCreator, tmp_path: Path) -> None:
+    project = tox_project({})
+
+    expected_tox_root = tmp_path
+    expected_work_dir = expected_tox_root / ".tox"
+
+    outcome = project.run("c", "--root", str(expected_tox_root))
+    outcome.assert_success()
+
+    assert outcome.state.conf.options.root_dir == expected_tox_root, "should parse the --root argument"
+
+    assert outcome.state.conf.core["tox_root"] == expected_tox_root, f"should set tox_root to {expected_tox_root}"
+
+    # values that depend on tox_root should also be updated
+
+    assert outcome.state.conf.core["work_dir"] == expected_work_dir
+    assert outcome.state.conf.core["temp_dir"] == expected_work_dir / ".tmp"
+
+    env_conf = outcome.state.conf.get_env("py")
+
+    assert env_conf["env_dir"] == expected_work_dir / "py"
+    assert env_conf["env_log_dir"] == expected_work_dir / "py" / "log"
+    assert env_conf["env_tmp_dir"] == expected_work_dir / "py" / "tmp"
+
+
+def test_custom_root_dir_and_work_dir(tox_project: ToxProjectCreator, tmp_path: Path) -> None:
     project = tox_project({})
-    outcome = project.run("c", "--workdir", str(project.path.parent))
-    assert outcome.state.conf.options.work_dir == project.path.parent
+
+    expected_tox_root = tmp_path / "tox_root"
+    expected_work_dir = tmp_path / "work_dir"
+
+    outcome = project.run("c", "--root", str(expected_tox_root), "--workdir", str(expected_work_dir))
+    outcome.assert_success()
+
+    assert outcome.state.conf.core["tox_root"] == expected_tox_root, f"should set tox_root to {expected_tox_root}"
+    assert outcome.state.conf.core["work_dir"] == expected_work_dir, f"should set work_dir to {expected_work_dir}"
+
+    # values that depend on work_dir should also be updated
+
+    assert outcome.state.conf.core["temp_dir"] == expected_work_dir / ".tmp"
+
+    env_conf = outcome.state.conf.get_env("py")
+
+    assert env_conf["env_dir"] == expected_work_dir / "py"
+    assert env_conf["env_log_dir"] == expected_work_dir / "py" / "log"
+    assert env_conf["env_tmp_dir"] == expected_work_dir / "py" / "tmp"

tests/tox_env/python/test_python_runner.py

@@ -95,7 +95,16 @@ def test_journal_package_dir(tmp_path: Path) -> None:
 
 def test_package_temp_dir_view(tox_project: ToxProjectCreator, demo_pkg_inline: Path) -> None:
     project = tox_project({"tox.ini": "[testenv]\npackage=wheel"})
-    result = project.run("r", "-vv", "-e", "py", "--root", str(demo_pkg_inline))
+    result = project.run(
+        "r",
+        "-vv",
+        "-e",
+        "py",
+        "--root",
+        str(demo_pkg_inline),
+        "--workdir",
+        str(project.path / ".tox"),
+    )
     result.assert_success()
     wheel_name = "demo_pkg_inline-1.0.0-py3-none-any.whl"
     session_path = Path(".tmp") / "package" / "1" / wheel_name