Use read-only test roots (#13285)

.github/workflows/main.yml

@@ -49,6 +49,10 @@ jobs:
     - uses: actions/checkout@v4
       with:
         persist-credentials: false
+    - name: Mount the test roots as read-only
+      run: |
+        mkdir -p ./tests/roots-read-only
+        sudo mount -v --bind --read-only ./tests/roots ./tests/roots-read-only
     - name: Set up Python ${{ matrix.python }}
       uses: actions/setup-python@v5
       with:

sphinx/testing/fixtures.py

@@ -104,12 +104,16 @@ def app_params(
 
     test_root = kwargs.pop('testroot', 'root')
     kwargs['srcdir'] = srcdir = sphinx_test_tempdir / kwargs.get('srcdir', test_root)
+    copy_test_root = not {'srcdir', 'copy_test_root'}.isdisjoint(kwargs)
 
     # special support for sphinx/tests
     if rootdir is not None:
         test_root_path = rootdir / f'test-{test_root}'
-        if test_root_path.is_dir() and not srcdir.exists():
-            shutil.copytree(test_root_path, srcdir)
+        if copy_test_root:
+            if test_root_path.is_dir():
+                shutil.copytree(test_root_path, srcdir, dirs_exist_ok=True)
+        else:
+            kwargs['srcdir'] = test_root_path
 
     # always write to the temporary directory
     kwargs.setdefault('builddir', srcdir / '_build')

sphinx/testing/util.py

@@ -223,7 +223,11 @@ def warning(self) -> StringIO:
     def cleanup(self, doctrees: bool = False) -> None:
         sys.path[:] = self._saved_path
         _clean_up_global_state()
-        self.docutils_conf_path.unlink(missing_ok=True)
+        try:
+            self.docutils_conf_path.unlink(missing_ok=True)
+        except OSError as exc:
+            if exc.errno != 30:  # Ignore "read-only file system" errors
+                raise
 
     def __repr__(self) -> str:
         return f'<{self.__class__.__name__} buildername={self._builder_name!r}>'

tests/conftest.py

@@ -19,7 +19,10 @@
     from collections.abc import Iterator
 
 _TESTS_ROOT = Path(__file__).resolve().parent
-_ROOTS_DIR = _TESTS_ROOT / 'roots'
+if 'CI' in os.environ and (_TESTS_ROOT / 'roots-read-only').is_dir():
+    _ROOTS_DIR = _TESTS_ROOT / 'roots-read-only'
+else:
+    _ROOTS_DIR = _TESTS_ROOT / 'roots'
 
 
 def _init_console(

tests/test_builders/test_build_linkcheck.py

@@ -257,6 +257,7 @@ def test_too_many_retries(app: SphinxTestApp) -> None:
     'linkcheck',
     testroot='linkcheck-raw-node',
     freshenv=True,
+    copy_test_root=True,
 )
 def test_raw_node(app: SphinxTestApp) -> None:
     with serve_application(app, OKHandler) as address:

tests/test_environment/test_environment.py

@@ -20,7 +20,7 @@
 )
 
 
-@pytest.mark.sphinx('dummy', testroot='basic')
+@pytest.mark.sphinx('dummy', testroot='basic', copy_test_root=True)
 def test_config_status(make_app, app_params):
     args, kwargs = app_params
 

tests/test_extensions/test_ext_autodoc_configs.py

@@ -1033,6 +1033,7 @@ def test_autodoc_typehints_description(app):
         'autodoc_typehints': 'description',
         'autodoc_typehints_description_target': 'documented',
     },
+    copy_test_root=True,
 )
 def test_autodoc_typehints_description_no_undoc(app):
     # No :type: or :rtype: will be injected for `incr`, which does not have
@@ -1085,6 +1086,7 @@ def test_autodoc_typehints_description_no_undoc(app):
         'autodoc_typehints': 'description',
         'autodoc_typehints_description_target': 'documented_params',
     },
+    copy_test_root=True,
 )
 def test_autodoc_typehints_description_no_undoc_doc_rtype(app):
     # No :type: will be injected for `incr`, which does not have a description
@@ -1154,6 +1156,7 @@ def test_autodoc_typehints_description_no_undoc_doc_rtype(app):
     'text',
     testroot='ext-autodoc',
     confoverrides={'autodoc_typehints': 'description'},
+    copy_test_root=True,
 )
 def test_autodoc_typehints_description_with_documented_init(app):
     with overwrite_file(
@@ -1198,6 +1201,7 @@ def test_autodoc_typehints_description_with_documented_init(app):
         'autodoc_typehints': 'description',
         'autodoc_typehints_description_target': 'documented',
     },
+    copy_test_root=True,
 )
 def test_autodoc_typehints_description_with_documented_init_no_undoc(app):
     with overwrite_file(
@@ -1232,6 +1236,7 @@ def test_autodoc_typehints_description_with_documented_init_no_undoc(app):
         'autodoc_typehints': 'description',
         'autodoc_typehints_description_target': 'documented_params',
     },
+    copy_test_root=True,
 )
 def test_autodoc_typehints_description_with_documented_init_no_undoc_doc_rtype(app):
     # see test_autodoc_typehints_description_with_documented_init_no_undoc
@@ -1276,6 +1281,7 @@ def test_autodoc_typehints_description_for_invalid_node(app):
     'text',
     testroot='ext-autodoc',
     confoverrides={'autodoc_typehints': 'both'},
+    copy_test_root=True,
 )
 def test_autodoc_typehints_both(app):
     with overwrite_file(

tests/test_extensions/test_ext_autosummary.py

@@ -151,6 +151,7 @@ def test_extract_summary(capsys):
     'dummy',
     testroot='ext-autosummary-ext',
     confoverrides=defaults.copy(),
+    copy_test_root=True,
 )
 def test_get_items_summary(make_app, app_params):
     import sphinx.ext.autosummary
@@ -227,6 +228,7 @@ def str_content(elem: Element) -> str:
     'xml',
     testroot='ext-autosummary-ext',
     confoverrides=defaults.copy(),
+    copy_test_root=True,
 )
 def test_escaping(app):
     app.build(force_all=True)
@@ -238,7 +240,7 @@ def test_escaping(app):
     assert str_content(title) == 'underscore_module_'
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary')
+@pytest.mark.sphinx('html', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate_content_for_module(app):
     import autosummary_dummy_module  # type: ignore[import-not-found]
 
@@ -298,7 +300,7 @@ def test_autosummary_generate_content_for_module(app):
     assert context['objtype'] == 'module'
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary')
+@pytest.mark.sphinx('html', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate_content_for_module___all__(app):
     import autosummary_dummy_module
 
@@ -343,7 +345,7 @@ def test_autosummary_generate_content_for_module___all__(app):
     assert context['objtype'] == 'module'
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary')
+@pytest.mark.sphinx('html', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate_content_for_module_skipped(app):
     import autosummary_dummy_module
 
@@ -389,7 +391,7 @@ def skip_member(app, what, name, obj, skip, options):
     assert context['exceptions'] == []
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary')
+@pytest.mark.sphinx('html', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate_content_for_module_imported_members(app):
     import autosummary_dummy_module
 
@@ -455,7 +457,7 @@ def test_autosummary_generate_content_for_module_imported_members(app):
     assert context['objtype'] == 'module'
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary')
+@pytest.mark.sphinx('html', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate_content_for_module_imported_members_inherited_module(app):
     import autosummary_dummy_inherited_module  # type: ignore[import-not-found]
 
@@ -501,7 +503,7 @@ def test_autosummary_generate_content_for_module_imported_members_inherited_modu
     assert context['objtype'] == 'module'
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary')
+@pytest.mark.sphinx('dummy', testroot='ext-autosummary', copy_test_root=True)
 def test_autosummary_generate(app):
     app.build(force_all=True)
 
@@ -650,6 +652,7 @@ def test_autosummary_generate(app):
     'dummy',
     testroot='ext-autosummary',
     confoverrides={'autosummary_generate_overwrite': False},
+    copy_test_root=True,
 )
 def test_autosummary_generate_overwrite1(app_params, make_app):
     args, kwargs = app_params
@@ -669,6 +672,7 @@ def test_autosummary_generate_overwrite1(app_params, make_app):
     'dummy',
     testroot='ext-autosummary',
     confoverrides={'autosummary_generate_overwrite': True},
+    copy_test_root=True,
 )
 def test_autosummary_generate_overwrite2(app_params, make_app):
     args, kwargs = app_params
@@ -684,7 +688,7 @@ def test_autosummary_generate_overwrite2(app_params, make_app):
     assert 'autosummary_dummy_module.rst' not in app._warning.getvalue()
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-recursive')
+@pytest.mark.sphinx('dummy', testroot='ext-autosummary-recursive', copy_test_root=True)
 @pytest.mark.usefixtures('rollback_sysmodules')
 def test_autosummary_recursive(app):
     sys.modules.pop('package', None)  # unload target module to clear the module cache
@@ -738,7 +742,11 @@ def test_autosummary_recursive_skips_mocked_modules(app):
     assert not (app.srcdir / 'generated' / 'package.package.module.rst').exists()
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-filename-map')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-filename-map',
+    copy_test_root=True,
+)
 def test_autosummary_filename_map(app):
     app.build()
 
@@ -756,6 +764,7 @@ def test_autosummary_filename_map(app):
     'latex',
     testroot='ext-autosummary-ext',
     confoverrides=defaults.copy(),
+    copy_test_root=True,
 )
 def test_autosummary_latex_table_colspec(app):
     app.build(force_all=True)
@@ -793,7 +802,11 @@ def test_import_by_name():
     assert modname == 'sphinx.ext.autosummary'
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-mock_imports')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-mock_imports',
+    copy_test_root=True,
+)
 def test_autosummary_mock_imports(app):
     try:
         app.build()
@@ -805,7 +818,11 @@ def test_autosummary_mock_imports(app):
         sys.modules.pop('foo', None)  # unload foo module
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-imported_members')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-imported_members',
+    copy_test_root=True,
+)
 def test_autosummary_imported_members(app):
     try:
         app.build()
@@ -820,7 +837,11 @@ def test_autosummary_imported_members(app):
         sys.modules.pop('autosummary_dummy_package', None)
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-module_all')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-module_all',
+    copy_test_root=True,
+)
 def test_autosummary_module_all(app):
     try:
         app.build()
@@ -839,7 +860,11 @@ def test_autosummary_module_all(app):
         sys.modules.pop('autosummary_dummy_package_all', None)
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-module_empty_all')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-module_empty_all',
+    copy_test_root=True,
+)
 def test_autosummary_module_empty_all(app):
     try:
         app.build()
@@ -867,6 +892,7 @@ def test_autosummary_module_empty_all(app):
     'html',
     testroot='ext-autodoc',
     confoverrides={'extensions': ['sphinx.ext.autosummary']},
+    copy_test_root=True,
 )
 def test_generate_autosummary_docs_property(app):
     with patch('sphinx.ext.autosummary.generate.find_autosummary_in_files') as mock:
@@ -886,7 +912,11 @@ def test_generate_autosummary_docs_property(app):
     )
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary-skip-member')
+@pytest.mark.sphinx(
+    'html',
+    testroot='ext-autosummary-skip-member',
+    copy_test_root=True,
+)
 def test_autosummary_skip_member(app):
     app.build()
 
@@ -895,7 +925,7 @@ def test_autosummary_skip_member(app):
     assert 'Foo._privatemeth' in content
 
 
-@pytest.mark.sphinx('html', testroot='ext-autosummary-template')
+@pytest.mark.sphinx('html', testroot='ext-autosummary-template', copy_test_root=True)
 def test_autosummary_template(app):
     app.build()
 

tests/test_extensions/test_ext_autosummary_imports.py

@@ -59,7 +59,11 @@ def test_autosummary_import_cycle(app):
     assert expected in app.warning.getvalue()
 
 
-@pytest.mark.sphinx('dummy', testroot='ext-autosummary-module_prefix')
+@pytest.mark.sphinx(
+    'dummy',
+    testroot='ext-autosummary-module_prefix',
+    copy_test_root=True,
+)
 @pytest.mark.usefixtures('rollback_sysmodules')
 def test_autosummary_generate_prefixes(app):
     app.build()

tests/test_extensions/test_ext_intersphinx.py

@@ -696,7 +696,7 @@ def log_message(*args, **kwargs):
     assert stderr == ''
 
 
-@pytest.mark.sphinx('html', testroot='ext-intersphinx-role')
+@pytest.mark.sphinx('html', testroot='ext-intersphinx-role', copy_test_root=True)
 def test_intersphinx_role(app):
     inv_file = app.srcdir / 'inventory'
     inv_file.write_bytes(INVENTORY_V2)