test: update a read-only setting

Ref: 5989

Signed-off-by: James Lu <jamesluhz@gmail.com>

manager/integration/tests/common.py

@@ -159,6 +159,7 @@
 SETTING_BACKUP_TARGET_CREDENTIAL_SECRET = "backup-target-credential-secret"
 SETTING_BACKUPSTORE_POLL_INTERVAL = "backupstore-poll-interval"
 SETTING_CREATE_DEFAULT_DISK_LABELED_NODES = "create-default-disk-labeled-nodes"
+SETTING_CURRENT_LONGHORN_VERSION = "current-longhorn-version"
 SETTING_DEFAULT_DATA_LOCALITY = "default-data-locality"
 SETTING_DEFAULT_DATA_PATH = "default-data-path"
 SETTING_DEFAULT_LONGHORN_STATIC_SC = "default-longhorn-static-storage-class"
@@ -5530,11 +5531,11 @@ def cleanup_all_support_bundles(client):
     Clean up all support bundles
     :param client: The Longhorn client to use in the request.
     """
-    longhorn_version = client.by_id_setting('current-longhorn-version').value
+    lh_version = client.by_id_setting(SETTING_CURRENT_LONGHORN_VERSION).value
     version_doesnt_have_support_bundle_manager = ['v1.1', 'v1.2', 'v1.3']
-    if any(_version in longhorn_version for
+    if any(_version in lh_version for
            _version in version_doesnt_have_support_bundle_manager):
-        print(f'{longhorn_version} doesn\'t have support bundle manager')
+        print(f'{lh_version} doesn\'t have support bundle manager')
         return
 
     support_bundles = client.list_support_bundle()

manager/integration/tests/test_settings.py

@@ -32,6 +32,7 @@
     SETTING_DEFAULT_REPLICA_COUNT,
     SETTING_BACKUP_TARGET,
     SETTING_CONCURRENT_VOLUME_BACKUP_RESTORE,
+    SETTING_CURRENT_LONGHORN_VERSION,
     RETRY_COUNTS, RETRY_INTERVAL, RETRY_INTERVAL_LONG,
     update_setting, BACKING_IMAGE_QCOW2_URL, BACKING_IMAGE_NAME,
     create_backing_image_with_matching_url, BACKING_IMAGE_EXT4_SIZE,
@@ -1241,3 +1242,28 @@ def test_setting_update_with_invalid_value_via_configmap(core_api, request):  #
                        ""])
 
     cleanup_volume_by_name(client, vol_name)
+
+def test_setting_update_readonly():  # NOQA
+    """
+    Test update read-only setting
+
+    1. Update read-only setting `current-longhorn-version`
+    2. An exception is returned with substring `read-only`
+    3. Update non-read-only setting `backup-target` and
+       it should be updated successfully
+    """
+    client = get_longhorn_api_client()  # NOQA
+
+    setting = client.by_id_setting(SETTING_CURRENT_LONGHORN_VERSION)
+    assert setting.value != ""
+
+    with pytest.raises(Exception) as e:
+        client.update(setting, value="v1.10.0-failed")
+    assert 'read-only' in str(e.value)
+
+    bt_setting_value_str = "nfs://invalid/faked"
+    bt_setting = client.by_id_setting(SETTING_BACKUP_TARGET)
+    bt_setting = client.update(bt_setting, value=bt_setting_value_str)
+    assert bt_setting.value == bt_setting_value_str
+    bt_setting = client.update(bt_setting, value="")
+    assert bt_setting.value == ""