Detach the loopback device at the end

Signed-off-by: Kazuyoshi Kato <[email protected]>

Author: kzys

tests/integration_tests/functional/test_drives.py

@@ -95,13 +95,17 @@ def test_rescan_dev(test_microvm_with_ssh, network_config):
     losetup_result = run(losetup, stdout=PIPE, check=True)
     loopback_device = losetup_result.stdout.decode('utf-8').rstrip()
 
-    response = test_microvm.drive.patch(
-        drive_id='scratch',
-        path_on_host=test_microvm.create_jailed_resource(loopback_device),
-    )
-    assert test_microvm.api_session.is_status_no_content(response.status_code)
+    try:
+        response = test_microvm.drive.patch(
+            drive_id='scratch',
+            path_on_host=test_microvm.create_jailed_resource(loopback_device),
+        )
+        assert test_microvm.api_session.is_status_no_content(response.status_code)
+
+        _check_scratch_size(ssh_connection, fs2.size())
+    finally:
+        run(['losetup', '-d', loopback_device], check=True)
 
-    _check_scratch_size(ssh_connection, fs2.size())
 
 
 def test_non_partuuid_boot(test_microvm_with_ssh, network_config):