Rescan device after filesystem creation

In work_on_disk function, IPA runs mkfs commands without
following device rescan operation. This leads to incorrect
content of uuids_to_return to be returned.
These mkfs commands modify partition label but IPA fails
to catch such changes because of no following device
rescan operation.

This commit adds call of device rescan function before
uuids_to_return construction.

Change-Id: I4e8b30deb5e2247f51ce8f10bd3271f64a264089

ironic_python_agent/partition_utils.py

@@ -316,6 +316,9 @@ def work_on_disk(dev, root_mb, swap_mb, ephemeral_mb, ephemeral_format,
                  "formatted for node %(node)s",
                  {'ephemeral': ephemeral_part, 'node': node_uuid})
 
+    # Rescan device to get current status (e.g. reflect modification of mkfs)
+    disk_utils.trigger_device_rescan(dev)
+
     uuids_to_return = {
         'root uuid': root_part,
         'efi system partition uuid': part_dict.get('efi system partition'),

ironic_python_agent/tests/unit/test_partition_utils.py

@@ -408,6 +408,8 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
                                              cpu_arch="")
         mock_unlink.assert_called_once_with('fake-path')
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan',
+                       lambda d: None)
     @mock.patch.object(utils, 'mkfs', lambda fs, path, label=None: None)
     @mock.patch.object(disk_utils, 'block_uuid', lambda p: 'uuid')
     @mock.patch.object(disk_utils, 'populate_image', autospec=True)
@@ -442,6 +444,8 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
         self.assertEqual('uuid', res['root uuid'])
         self.assertFalse(mock_populate.called)
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan',
+                       lambda d: None)
     @mock.patch.object(utils, 'mkfs', lambda fs, path, label=None: None)
     @mock.patch.object(disk_utils, 'block_uuid', lambda p: 'uuid')
     @mock.patch.object(disk_utils, 'populate_image', lambda image_path,
@@ -475,11 +479,12 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
                                              disk_label='gpt',
                                              cpu_arch="")
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan', autospec=True)
     @mock.patch.object(disk_utils, 'block_uuid', autospec=True)
     @mock.patch.object(disk_utils, 'populate_image', autospec=True)
     @mock.patch.object(utils, 'mkfs', autospec=True)
     def test_uefi_localboot(self, mock_mkfs, mock_populate_image,
-                            mock_block_uuid):
+                            mock_block_uuid, mock_trigger_device_rescan):
         """Test that we create a fat filesystem with UEFI localboot."""
         root_part = '/dev/fake-part1'
         efi_part = '/dev/fake-part2'
@@ -510,12 +515,14 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
                                                     root_part, conv_flags=None)
         mock_block_uuid.assert_any_call(root_part)
         mock_block_uuid.assert_any_call(efi_part)
+        mock_trigger_device_rescan.assert_called_once_with(self.dev)
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan', autospec=True)
     @mock.patch.object(disk_utils, 'block_uuid', autospec=True)
     @mock.patch.object(disk_utils, 'populate_image', autospec=True)
     @mock.patch.object(utils, 'mkfs', autospec=True)
     def test_preserve_ephemeral(self, mock_mkfs, mock_populate_image,
-                                mock_block_uuid):
+                                mock_block_uuid, mock_trigger_device_rescan):
         """Test that ephemeral partition doesn't get overwritten."""
         ephemeral_part = '/dev/fake-part1'
         root_part = '/dev/fake-part2'
@@ -543,11 +550,12 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
                                              cpu_arch="")
         self.assertFalse(mock_mkfs.called)
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan', autospec=True)
     @mock.patch.object(disk_utils, 'block_uuid', autospec=True)
     @mock.patch.object(disk_utils, 'populate_image', autospec=True)
     @mock.patch.object(utils, 'mkfs', autospec=True)
     def test_ppc64le_prep_part(self, mock_mkfs, mock_populate_image,
-                               mock_block_uuid):
+                               mock_block_uuid, mock_trigger_device_rescan):
         """Test that PReP partition uuid is returned."""
         prep_part = '/dev/fake-part1'
         root_part = '/dev/fake-part2'
@@ -573,11 +581,12 @@ class WorkOnDiskTestCase(base.IronicAgentTest):
                                              cpu_arch="ppc64le")
         self.assertFalse(mock_mkfs.called)
 
+    @mock.patch.object(disk_utils, 'trigger_device_rescan', autospec=True)
     @mock.patch.object(disk_utils, 'block_uuid', autospec=True)
     @mock.patch.object(disk_utils, 'populate_image', autospec=True)
     @mock.patch.object(utils, 'mkfs', autospec=True)
     def test_convert_to_sparse(self, mock_mkfs, mock_populate_image,
-                               mock_block_uuid):
+                               mock_block_uuid, mock_trigger_device_rescan):
         ephemeral_part = '/dev/fake-part1'
         swap_part = '/dev/fake-part2'
         root_part = '/dev/fake-part3'

releasenotes/notes/rescan-device-after-mkfs-3f9d52a2e3b6fff3.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Adds device rescan operation after partitioning the root device to ensure
+    that updated UUIDs are reflected correctly