test-framework: Add nullblock to test-framework

Signed-off-by: Kamil Gierszewski <kamil.gierszewski@huawei.com>

test_tools/disk_utils.py

@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2019-2022 Intel Corporation
+# Copyright(c) 2023 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -375,7 +376,13 @@ def _is_by_id_path(path: str):
 
 def _is_dev_path_whitelisted(path: str):
     """check if given path is whitelisted"""
-    whitelisted_paths = [r"cas\d+-\d+", r"/dev/dm-\d+"]
+    whitelisted_paths = [
+        r"/dev/ram\d+",
+        r"/nullb\d+",
+        r"/dev/drbd\d+",
+        r"cas\d+-\d+",
+        r"/dev/dm-\d+"
+    ]
 
     for whitelisted_path in whitelisted_paths:
         if re.search(whitelisted_path, path) is not None:

test_tools/fs_utils.py

@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2019-2022 Intel Corporation
+# Copyright(c) 2023 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -99,6 +100,10 @@ def check_if_regular_file_exists(path):
     return TestRun.executor.run(f"test -f \"{path}\"").exit_code == 0
 
 
+def check_if_special_block_exist(path):
+    return TestRun.executor.run(f"test -b \"{path}\"").exit_code == 0
+
+
 def check_if_symlink_exists(path):
     return TestRun.executor.run(f"test -L \"{path}\"").exit_code == 0
 
@@ -266,7 +271,7 @@ def uncompress_archive(file, destination=None):
 def ls(path, options=''):
     default_options = "-lA --time-style=+'%Y-%m-%d %H:%M:%S'"
     output = TestRun.executor.run(
-        f"ls {default_options} {options} \"{path}\"")
+        f"ls {default_options} {options} {path}")
     return output.stdout
 
 
@@ -308,7 +313,6 @@ def parse_ls_output(ls_output, dir_path=''):
         from test_utils.filesystem.file import File, FsItem
         from test_utils.filesystem.directory import Directory
         from test_utils.filesystem.symlink import Symlink
-
         if file_type == '-':
             fs_item = File(full_path)
         elif file_type == 'd':

test_utils/filesystem/symlink.py

@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2019-2021 Intel Corporation
+# Copyright(c) 2023 Huawei Technologies Co., Ltd.
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -9,6 +10,7 @@ from test_tools.fs_utils import (
     create_directory,
     check_if_symlink_exists,
     check_if_directory_exists,
+    check_if_special_block_exist
 )
 from test_utils.filesystem.file import File
 
@@ -76,6 +78,11 @@ class Symlink(File):
         elif not create:
             raise FileNotFoundError("Requested symlink does not exist.")
 
+        is_special_block = check_if_special_block_exist(link_path)
+        if is_special_block:
+            if not target or readlink(link_path) == readlink(target):
+                return cls(link_path)
+
         is_dir = check_if_directory_exists(link_path)
         if is_dir:
             raise IsADirectoryError(