Use importlib_resources instead of pkg_resources and install built-in appliances in config dir.

gns3server/controller/__init__.py

@@ -22,6 +22,7 @@ import uuid
 import socket
 import shutil
 import aiohttp
+import importlib_resources
 
 from ..config import Config
 from .project import Project
@@ -35,7 +36,6 @@ from .symbols import Symbols
 from ..version import __version__
 from .topology import load_topology
 from .gns3vm import GNS3VM
-from ..utils.get_resource import get_resource
 from .gns3vm.gns3_vm_error import GNS3VMError
 
 import logging
@@ -65,7 +65,7 @@ class Controller:
     async def start(self):
 
         log.info("Controller is starting")
-        self.load_base_files()
+        self._load_base_files()
         server_config = Config.instance().get_section_config("Server")
         Config.instance().listen_for_config_changes(self._update_config)
         host = server_config.get("host", "localhost")
@@ -242,6 +242,7 @@ class Controller:
         if "iou_license" in controller_settings:
             self._iou_license_settings = controller_settings["iou_license"]
 
+        self._appliance_manager.install_builtin_appliances()
         self._appliance_manager.appliances_etag = controller_settings.get("appliances_etag")
         self._appliance_manager.load_appliances()
         self._template_manager.load_templates(controller_settings.get("templates"))
@@ -269,20 +270,21 @@ class Controller:
         except OSError as e:
             log.error(str(e))
 
-    def load_base_files(self):
+    def _load_base_files(self):
         """
         At startup we copy base file to the user location to allow
         them to customize it
         """
 
         dst_path = self.configs_path()
-        src_path = get_resource('configs')
         try:
-            for file in os.listdir(src_path):
-                if not os.path.exists(os.path.join(dst_path, file)):
-                    shutil.copy(os.path.join(src_path, file), os.path.join(dst_path, file))
-        except OSError:
-            pass
+            for entry in importlib_resources.files('gns3server.configs').iterdir():
+                full_path = os.path.join(dst_path, entry.name)
+                if entry.is_file() and not os.path.exists(full_path):
+                    log.debug(f"Installing base config file {entry.name} to {full_path}")
+                    shutil.copy(str(entry), os.path.join(dst_path, entry.name))
+        except OSError as e:
+            log.error(f"Could not install base config files to {dst_path}: {e}")
 
     def images_path(self):
         """