fix(azure): handle unexpected exceptions during obtain_lease()

cloudinit/sources/DataSourceAzure.py

@@ -467,6 +467,12 @@ def _setup_ephemeral_networking(
                         ),
                         host_only=True,
                     )
+                except FileNotFoundError as error:
+                    report_diagnostic_event(
+                        "File not found during DHCP %r" % error,
+                        logger_func=LOG.error,
+                    )
+                    raise error
                 except subp.ProcessExecutionError as error:
                     # udevadm settle, ip link set dev eth0 up, etc.
                     report_diagnostic_event(

tests/unittests/sources/test_azure.py

@@ -3424,6 +3424,25 @@ def test_basic_setup_without_wireserver_opt(
         assert azure_ds._wireserver_endpoint == "168.63.129.16"
         assert azure_ds._ephemeral_dhcp_ctx.iface == lease["interface"]
 
+    def test_no_retry_missing_driver(
+        self,
+        azure_ds,
+        caplog,
+        mock_ephemeral_dhcp_v4
+    ):
+        mock_ephemeral_dhcp_v4.return_value.obtain_lease.side_effect = [       
+            FileNotFoundError     
+        ]
+
+        with pytest.raises(FileNotFoundError):
+            azure_ds._setup_ephemeral_networking()
+
+        assert (
+            mock_ephemeral_dhcp_v4.return_value.mock_calls
+            == [mock.call.obtain_lease()]
+        )
+        assert "File not found during DHCP" in caplog.text
+
     def test_no_retry_missing_dhclient_error(
         self,
         azure_ds,