Ignore pyudev errors about device number

Pyudev is used to return extra data about a device
using the udev interface.

Sometimes that lookup doesn't quite work, like on
md devices after restarting them. As such, we will
now tollerate the failure and continue the process
as before.

Change-Id: Ibbc1759fe2cd3d7d09019b4e80d3c61d54c844dd
Story: 2007281
Task: 38726

ironic_python_agent/hardware.py

@@ -371,6 +371,11 @@ def list_all_block_devices(block_type='disk',
             LOG.warning("Device %(dev)s is inaccessible, skipping... "
                         "Error: %(error)s", {'dev': name, 'error': e})
             extra = {}
+        except pyudev.DeviceNotFoundByNumberError as e:
+            LOG.warning("Device %(dev)s is not supported by pyudev, "
+                        "skipping... Error: %(error)s",
+                        {'dev': name, 'error': e})
+            extra = {}
         else:
             # TODO(lucasagomes): Since lsblk only supports
             # returning the short serial we are using

ironic_python_agent/tests/unit/test_hardware.py

@@ -1666,7 +1666,11 @@ class TestGenericHardwareManager(base.IronicAgentTest):
         mock_listdir.return_value = [os.path.basename(x)
                                      for x in sorted(by_path_map)]
         mocked_execute.return_value = (BLK_DEVICE_TEMPLATE, '')
-        mocked_udev.side_effect = pyudev.DeviceNotFoundByFileError()
+        mocked_udev.side_effect = [pyudev.DeviceNotFoundByFileError(),
+                                   pyudev.DeviceNotFoundByNumberError('block',
+                                                                      1234),
+                                   pyudev.DeviceNotFoundByFileError(),
+                                   pyudev.DeviceNotFoundByFileError()]
         mocked_dev_vendor.return_value = 'Super Vendor'
         devices = hardware.list_all_block_devices()
         expected_devices = [