Use .tox instead of .tox/4 as work dir

.github/workflows/check.yml

@@ -62,11 +62,11 @@ jobs:
           DIFF_AGAINST: HEAD
       - name: Rename coverage report file
         run: |
-          import os; os.rename('.tox/4/coverage.{}.xml'.format(os.environ['TOXENV']), '.tox/4/coverage.xml')
+          import os; os.rename('.tox/coverage.{}.xml'.format(os.environ['TOXENV']), '.tox/coverage.xml')
         shell: python
       - uses: codecov/codecov-action@v1
         with:
-          file: ./.tox/4/coverage.xml
+          file: ./.tox/coverage.xml
           flags: tests
           name: ${{ matrix.py }} - ${{ matrix.os }}
 

docs/changelog/2346.feature.rst

@@ -0,0 +1 @@
+Use ``.tox`` as working directory instead of ``.tox/4`` - by :user:`gaborbernat`.

src/tox/config/sets.py

@@ -188,8 +188,7 @@ def register_config(self) -> None:
         )
 
         def work_dir_builder(conf: Config, env_name: str | None) -> Path:  # noqa: U100
-            # here we pin to .tox/4 to be able to use in parallel with v3 until final release
-            return (conf.work_dir if conf.work_dir is not None else cast(Path, self["tox_root"])) / ".tox" / "4"
+            return (conf.work_dir if conf.work_dir is not None else cast(Path, self["tox_root"])) / ".tox"
 
         self.add_config(
             keys=["work_dir", "toxworkdir"],

tests/session/cmd/test_sequential.py

@@ -432,7 +432,7 @@ def test_sequential_inserted_env_vars(tox_project: ToxProjectCreator, demo_pkg_i
 
     assert re.search(f"TOX_PACKAGE={re.escape(str(project.path))}.*.tar.gz{os.linesep}", result.out)
     assert f"TOX_ENV_NAME=py{os.linesep}" in result.out
-    work_dir = project.path / ".tox" / "4"
+    work_dir = project.path / ".tox"
     assert f"TOX_WORK_DIR={work_dir}{os.linesep}" in result.out
     env_dir = work_dir / "py"
     assert f"TOX_ENV_DIR={env_dir}{os.linesep}" in result.out

tests/tox_env/test_tox_env_api.py

@@ -38,7 +38,7 @@ def test_env_log(tox_project: ToxProjectCreator) -> None:
     result_first = prj.run("r")
     result_first.assert_success()
 
-    log_dir = prj.path / ".tox" / "4" / "py" / "log"
+    log_dir = prj.path / ".tox" / "py" / "log"
     assert log_dir.exists(), result_first.out
 
     filename = {i.name for i in log_dir.iterdir()}