[MessagePassing] Fix OSError on read-only file systems

CHANGELOG.md

@@ -25,6 +25,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
+- Fixed `OSError` on read-only file systems within `MessagePassing` ([#9032](https://github.com/pyg-team/pytorch_geometric/pull/9032))
 - Fixed metaclass conflict in `Dataset` ([#8999](https://github.com/pyg-team/pytorch_geometric/pull/8999))
 - Fixed import errors on `MessagePassing` modules with nested inheritance ([#8973](https://github.com/pyg-team/pytorch_geometric/pull/8973))
 

torch_geometric/inspector.py

@@ -320,17 +320,6 @@ def collect_param_data(
 
     # Inspecting Method Bodies ################################################
 
-    @property
-    def can_read_source(self) -> bool:
-        r"""Returns :obj:`True` if able to read the source file of the
-        inspected class.
-        """
-        try:
-            inspect.getfile(self._cls)
-            return True
-        except Exception:
-            return False
-
     def get_source(self, cls: Optional[Type] = None) -> str:
         r"""Returns the source code of :obj:`cls`."""
         cls = cls or self._cls

torch_geometric/nn/conv/message_passing.py

@@ -166,7 +166,7 @@ def __init__(
         jinja_prefix = f'{self.__module__}_{self.__class__.__name__}'
         # Optimize `propagate()` via `*.jinja` templates:
         if not self.propagate.__module__.startswith(jinja_prefix):
-            if self.inspector.can_read_source:
+            try:
                 module = module_from_template(
                     module_name=f'{jinja_prefix}_propagate',
                     template_path=osp.join(root_dir, 'propagate.jinja'),
@@ -190,15 +190,14 @@ def __init__(
 
                 self.__class__.propagate = module.propagate
                 self.__class__.collect = module.collect
-            else:
+            except Exception:  # pragma: no cover
                 self.__class__._orig_propagate = self.__class__.propagate
                 self.__class__._jinja_propagate = self.__class__.propagate
 
         # Optimize `edge_updater()` via `*.jinja` templates (if implemented):
         if (self.inspector.implements('edge_update')
                 and not self.edge_updater.__module__.startswith(jinja_prefix)):
-            if self.inspector.can_read_source:
-
+            try:
                 module = module_from_template(
                     module_name=f'{jinja_prefix}_edge_updater',
                     template_path=osp.join(root_dir, 'edge_updater.jinja'),
@@ -216,7 +215,7 @@ def __init__(
 
                 self.__class__.edge_updater = module.edge_updater
                 self.__class__.edge_collect = module.edge_collect
-            else:
+            except Exception:  # pragma: no cover
                 self.__class__._orig_edge_updater = self.__class__.edge_updater
                 self.__class__._jinja_edge_updater = (
                     self.__class__.edge_updater)