Try to fix the CI

Signed-off-by: Bernát Gábor <bgabor8@bloomberg.net>

tasks/make_zipapp.py

@@ -201,7 +201,7 @@ def build_sdist(self, target):
                 shutil.copytree(
                     str(target),
                     str(folder),
-                    ignore=shutil.ignore_patterns(".tox", "venv", "__pycache__", "*.pyz"),
+                    ignore=shutil.ignore_patterns(".tox", ".tox4", "venv", "__pycache__", "*.pyz"),
                 )
                 try:
                     return self._build_sdist(self.into, folder)

tests/conftest.py

@@ -129,9 +129,38 @@ def ensure_py_info_cache_empty(session_app_data):
     PythonInfo.clear_cache(session_app_data)
 
 
-@pytest.fixture(autouse=True)
-def ignore_global_config(tmp_path, monkeypatch):
-    monkeypatch.setenv(ensure_str("VIRTUALENV_CONFIG_FILE"), str(tmp_path / "this-should-never-exist"))
+@contextmanager
+def change_os_environ(key, value):
+    env_var = key
+    previous = os.environ[env_var] if env_var in os.environ else None
+    os.environ[env_var] = value
+    try:
+        yield
+    finally:
+        if previous is not None:
+            os.environ[env_var] = previous
+
+
+@pytest.fixture(autouse=True, scope="session")
+def ignore_global_config(tmp_path_factory):
+    filename = str(tmp_path_factory.mktemp("folder") / "virtualenv-test-suite.ini")
+    with change_os_environ(ensure_str("VIRTUALENV_CONFIG_FILE"), filename):
+        yield
+
+
+@pytest.fixture(autouse=True, scope="session")
+def pip_cert(tmp_path_factory):
+    # workaround for https://github.com/pypa/pip/issues/8984 - if the certificate is explicitly set no error can happen
+    key = ensure_str("PIP_CERT")
+    if key in os.environ:
+        return
+    cert = tmp_path_factory.mktemp("folder") / "cert"
+    import pkgutil
+
+    cert_data = pkgutil.get_data("pip._vendor.certifi", "cacert.pem")
+    cert.write_bytes(cert_data)
+    with change_os_environ(key, str(cert)):
+        yield
 
 
 @pytest.fixture(autouse=True)

tox.ini

@@ -38,7 +38,7 @@ commands =
     python -m coverage erase
     python -m coverage run -m pytest \
       --junitxml {toxworkdir}/junit.{envname}.xml \
-      {posargs:tests --int --timeout 600 -n {env:PYTEST_XDIST:auto}}
+      {posargs:tests --int --timeout 600 -n 0}
     python -m coverage combine
     python -m coverage report --skip-covered --show-missing
     python -m coverage xml -o {toxworkdir}/coverage.{envname}.xml