Replace pkg_resources to impotlib (#217)

Author: bjk7119

src/fosslight_util/help.py

@@ -3,7 +3,10 @@
 # Copyright (c) 2021 LG Electronics Inc.
 # SPDX-License-Identifier: Apache-2.0
 import sys
-import pkg_resources
+try:
+    from importlib.metadata import version, PackageNotFoundError
+except ImportError:
+    from importlib_metadata import version, PackageNotFoundError  # Python <3.8
 
 _HELP_MESSAGE_COMMON = """
          _______  _______  _______  _______  ___      ___           __
@@ -50,7 +53,10 @@ def print_help_msg(self, exitopt: bool) -> None:
 def print_package_version(pkg_name: str, msg: str = "", exitopt: bool = True) -> str:
     if msg == "":
         msg = f"{pkg_name} Version:"
-    cur_version = pkg_resources.get_distribution(pkg_name).version
+    try:
+        cur_version = version(pkg_name)
+    except PackageNotFoundError:
+        cur_version = "unknown"
 
     if exitopt:
         print(f'{msg} {cur_version}')

src/fosslight_util/set_log.py

@@ -6,7 +6,6 @@
 import logging
 import os
 from pathlib import Path
-import pkg_resources
 import sys
 import platform
 from . import constant as constant
@@ -15,6 +14,11 @@
 from typing import Tuple
 from logging import Logger
 
+try:
+    from importlib.metadata import version, PackageNotFoundError
+except ImportError:
+    from importlib_metadata import version, PackageNotFoundError  # Python <3.8
+
 
 def init_check_latest_version(pkg_version="", main_package_name=""):
 
@@ -92,9 +96,11 @@ def init_log(log_file: str, create_file: bool = True, stream_log_level: int = lo
     if main_package_name != "":
         pkg_info = main_package_name
         try:
-            pkg_version = pkg_resources.get_distribution(main_package_name).version
+            pkg_version = version(main_package_name)
             init_check_latest_version(pkg_version, main_package_name)
             pkg_info = main_package_name + " v" + pkg_version
+        except PackageNotFoundError:
+            logger.debug('Cannot check the version: Package not found')
         except Exception as error:
             logger.debug('Cannot check the version:' + str(error))
         _result_log["Tool Info"] = pkg_info