Get varlink's interface description file using importlib.resources.files

This will prevent issues with packed packages.

Available since py39 and f080d4b dropped
support of older versions.

Author: Rémy Noel

varlink/client.py

@@ -1,3 +1,4 @@
+import importlib.resources
 import json
 import os
 import shutil
@@ -344,9 +345,10 @@ def __init__(self, address=None, resolve_interface=None, resolver=None):
         self._child_pid = 0
         self._str = "Client<uninitialized>"
 
-        with open(os.path.join(os.path.dirname(__file__), "org.varlink.service.varlink")) as f:
-            interface = Interface(f.read())
-            self.add_interface(interface)
+        interface = Interface(
+            importlib.resources.read_text("varlink", "org.varlink.service.varlink")
+        )
+        self.add_interface(interface)
 
         if resolve_interface:
             self._with_interface(resolve_interface, resolver)