Ensure correct directory is set for pep517 calls

tests/backends/build_system/functional/test_aws_cli_venv.py

@@ -10,6 +10,7 @@
 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
+import contextlib
 import re
 import os
 import sys
@@ -29,6 +30,16 @@
 ROOT_DIR = pathlib.Path(__file__).parents[4]
 
 
+@contextlib.contextmanager
+def cd(dirname):
+    original = os.getcwd()
+    os.chdir(dirname)
+    try:
+        yield
+    finally:
+        os.chdir(original)
+
+
 @pytest.fixture(scope="session")
 def venv_path(tmp_path_factory):
     return tmp_path_factory.mktemp("venv")
@@ -54,8 +65,9 @@ def _normalize_dist_info_name(self, name: str) -> str:
         name = name.lower()
         return name
 
-    def _get_install_requires(self):
-        requires = flit_core.buildapi.get_requires_for_build_wheel()
+    def _get_install_requires(self, root_):
+        with cd(ROOT_DIR):
+            requires = flit_core.buildapi.get_requires_for_build_wheel()
         # Generation of the auto-complete index requires importing from the
         # awscli package and iterating over the commands from the clidriver. In
         # order to be able to do this, it requires all of the CLI's runtime