Support compositor node trees in Blender 5.0

Since Blender 5.0 these use a different DNA field. BAT now supports
this too, and supports linked node trees as well.

See blender/blender@bd61e69be5

blender_asset_tracer/trace/expanders.py

@@ -90,7 +90,14 @@ def _expand_generic_mtex(block: blendfile.BlendFileBlock):
 
 
 def _expand_generic_nodetree(block: blendfile.BlendFileBlock):
-    assert block.dna_type.dna_type_id == b"bNodeTree"
+    if block.dna_type.dna_type_id == b"ID":
+        # This is a placeholder for a linked node tree.
+        yield block
+        return
+
+    assert (
+        block.dna_type.dna_type_id == b"bNodeTree"
+    ), f"Expected bNodeTree, got {block.dna_type.dna_type_id.decode()})"
 
     nodes = block.get_pointer((b"nodes", b"first"))
 
@@ -145,7 +152,11 @@ def _expand_generic_idprops(block: blendfile.BlendFileBlock):
 
 
 def _expand_generic_nodetree_id(block: blendfile.BlendFileBlock):
-    block_ntree = block.get_pointer(b"nodetree", None)
+    if block.bfile.header.version >= 500 and block.bfile.file_subversion >= 4:
+        # Introduced in Blender 5.0, commit bd61e69be5a7c96f1e5da1c86aafc17b839e049f
+        block_ntree = block.get_pointer(b"compositing_node_group", None)
+    else:
+        block_ntree = block.get_pointer(b"nodetree", None)
     if block_ntree is not None:
         yield from _expand_generic_nodetree(block_ntree)
 

tests/test_tracer.py

@@ -506,6 +506,26 @@ class DepsTest(AbstractTracerTest):
             },
         )
 
+    def test_compositor_nodes(self) -> None:
+        """Test compositor node trees.
+
+        Since Blender 5.0 these use a different DNA field, and can also be
+        linked from other files.
+        """
+        self.assert_deps(
+            "compositor_nodes/compositor_nodes_blender500_workfile.blend",
+            {
+                b"LIcompositor_nodes_blender500_library.blend": Expect(
+                    type="Library",
+                    full_field="name[1024]",
+                    dirname_field=None,
+                    basename_field=None,
+                    asset_path=b"//compositor_nodes_blender500_library.blend",
+                    is_sequence=False,
+                ),
+            },
+        )
+
     def test_usage_abspath(self):
         deps = [
             dep