Rely on 'session' context when building wheel and sdist. Fixes #3059.

setup.cfg

@@ -64,7 +64,6 @@ testing =
 	sphinx>=4.3.2
 	jaraco.path>=3.2.0
 	build[virtualenv]
-	filelock>=3.4.0
 	pip_run>=8.8
 
 testing-integration =

setuptools/tests/contexts.py

@@ -7,7 +7,6 @@
 import io
 
 import pkg_resources
-from filelock import FileLock
 
 
 @contextlib.contextmanager
@@ -97,15 +96,3 @@ def suppress_exceptions(*excs):
         yield
     except excs:
         pass
-
-
-@contextlib.contextmanager
-def session_locked_tmp_dir(tmp_path_factory, name):
-    """Uses a file lock to guarantee only one worker can access a temp dir"""
-    root_tmp_dir = tmp_path_factory.getbasetemp().parent
-    # ^-- get the temp directory shared by all workers
-    locked_dir = root_tmp_dir / name
-    with FileLock(locked_dir.with_suffix(".lock")):
-        # ^-- prevent multiple workers to access the directory at once
-        locked_dir.mkdir(exist_ok=True, parents=True)
-        yield locked_dir

setuptools/tests/fixtures.py

@@ -64,30 +64,22 @@ def sample_project(tmp_path):
 
 @pytest.fixture(scope="session")
 def setuptools_sdist(tmp_path_factory, request):
-    with contexts.session_locked_tmp_dir(tmp_path_factory, "sdist_build") as tmp:
-        dist = next(tmp.glob("*.tar.gz"), None)
-        if dist:
-            return dist
-
-        subprocess.check_call([
-            sys.executable, "-m", "build", "--sdist",
-            "--outdir", str(tmp), str(request.config.rootdir)
-        ])
-        return next(tmp.glob("*.tar.gz"))
+    target = tmp_path_factory.mktemp('sdist_build')
+    subprocess.check_call([
+        sys.executable, "-m", "build", "--sdist",
+        "--outdir", str(target), str(request.config.rootdir),
+    ])
+    return next(target.glob("*.tar.gz"))
 
 
 @pytest.fixture(scope="session")
 def setuptools_wheel(tmp_path_factory, request):
-    with contexts.session_locked_tmp_dir(tmp_path_factory, "wheel_build") as tmp:
-        dist = next(tmp.glob("*.whl"), None)
-        if dist:
-            return dist
-
-        subprocess.check_call([
-            sys.executable, "-m", "build", "--wheel",
-            "--outdir", str(tmp) , str(request.config.rootdir)
-        ])
-        return next(tmp.glob("*.whl"))
+    target = tmp_path_factory.mktemp('wheel_build')
+    subprocess.check_call([
+        sys.executable, "-m", "build", "--wheel",
+        "--outdir", str(target) , str(request.config.rootdir)
+    ])
+    return next(target.glob("*.whl"))
 
 
 @pytest.fixture