Use importlib instead of pkg_resources

gns3/main.py

@@ -30,16 +30,6 @@
 except Exception as e:
     print("Fail update installation: {}".format(str(e)))
 
-
-# WARNING
-# Due to buggy user machines we choose to put this as the first loading modules
-# otherwise the egg cache is initialized in his standard location and
-# if is not writetable the application crash. It's the user fault
-# because one day the user as used sudo to run an egg and break his
-# filesystem permissions, but it's a common mistake.
-from gns3.utils.get_resource import get_resource
-
-
 import datetime
 import traceback
 import time

gns3/modules/iou/pages/iou_device_configuration_page.py

@@ -57,6 +57,7 @@ def __init__(self):
             self.uiPrivateConfigToolButton.hide()
 
         # location of the base config templates
+        # FIXME: this does not work
         self._base_iou_l2_config_template = get_resource(os.path.join("configs", "iou_l2_base_startup-config.txt"))
         self._base_iou_l3_config_template = get_resource(os.path.join("configs", "iou_l3_base_startup-config.txt"))
         self._default_configs_dir = LocalServer.instance().localServerSettings()["configs_path"]

gns3/registry/appliance.py

@@ -62,7 +62,7 @@ def _check_config(self):
         if self._appliance["registry_version"] > 7:
             raise ApplianceError("Please update GNS3 in order to install this appliance")
 
-        with open(get_resource(os.path.join("schemas", "appliance.json"))) as f:
+        with open(get_resource("schemas/appliance.json")) as f:
             schema = json.load(f)
         v = jsonschema.Draft4Validator(schema)
         try:

gns3/utils/get_resource.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2014 GNS3 Technologies Inc.
+# Copyright (C) 2023 GNS3 Technologies Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,50 +15,35 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import sys
-import os
-import tempfile
-import pkg_resources
 import atexit
 import logging
-
-log = logging.getLogger(__name__)
+import os
+import sys
 
 try:
-    egg_cache_dir = tempfile.mkdtemp()
-    pkg_resources.set_extraction_path(egg_cache_dir)
-except ValueError:
-    # If the path is already set the module throw an error
-    pass
+    import importlib_resources
+except ImportError:
+    from importlib import resources as importlib_resources
 
 
-@atexit.register
-def clean_egg_cache():
-    try:
-        import shutil
-        shutil.rmtree(egg_cache_dir, ignore_errors=True)
-    except Exception:
-        # We don't care if we can not cleanup
-        pass
+from contextlib import ExitStack
+resource_manager = ExitStack()
+atexit.register(resource_manager.close)
+
+log = logging.getLogger(__name__)
 
 
 def get_resource(resource_name):
+    """
+    Return a resource in current directory or in frozen package
+    """
 
     resource_path = None
     if hasattr(sys, "frozen"):
         resource_path = os.path.normpath(os.path.join(os.path.dirname(sys.executable), resource_name))
-        if sys.platform.startswith("darwin") and not os.path.exists(resource_path):
-            resource_path = os.path.normpath(os.path.join(os.path.dirname(sys.executable), "lib", resource_name))
-    elif not hasattr(sys, "frozen"):
-        if pkg_resources.resource_exists("gns3", resource_name):
-            try:
-                resource_path = pkg_resources.resource_filename("gns3", resource_name)
-            except pkg_resources.ExtractionError as e:
-                log.fatal(e)
-                sys.stderr.write(e)
-                sys.exit(1)
-            resource_path = os.path.normpath(resource_path)
-        else:
-            resource_path = os.path.dirname(os.path.realpath(__file__))
-            resource_path = os.path.join(resource_path, "..", "..", "resources", resource_name)
+    else:
+        ref = importlib_resources.files("gns3") / resource_name
+        path = resource_manager.enter_context(importlib_resources.as_file(ref))
+        if os.path.exists(path):
+            resource_path = os.path.normpath(path)
     return resource_path

requirements.txt

@@ -4,5 +4,6 @@ sentry-sdk==1.29.2,<1.30
 psutil==5.9.5
 distro>=1.8.0
 truststore>=0.7.0; python_version >= '3.10'
+importlib-resources>=1.3; python_version <= '3.9'
 setuptools>=60.8.1; python_version >= '3.7'
 setuptools==59.6.0; python_version < '3.7'  # v59.6.0 is the last version to support Python 3.6