Codegen: prepend `.gitattributes` entries with `/`

misc/codegen/lib/render.py

@@ -194,8 +194,8 @@ class RenderManager(Renderer):
     def _dump_registry(self):
         self._registry_path.parent.mkdir(parents=True, exist_ok=True)
         with open(self._registry_path, 'w') as out, open(self._registry_path.parent / ".gitattributes", "w") as attrs:
-            print(self._registry_path.name, "linguist-generated", file=attrs)
-            print(".gitattributes", "linguist-generated", file=attrs)
+            print(f"/{self._registry_path.name}", "linguist-generated", file=attrs)
+            print("/.gitattributes", "linguist-generated", file=attrs)
             for f, hashes in sorted(self._hashes.items()):
                 print(f, hashes.pre, hashes.post, file=out)
-                print(f, "linguist-generated", file=attrs)
+                print(f"/{f}", "linguist-generated", file=attrs)

misc/codegen/test/test_render.py

@@ -46,7 +46,7 @@ def write_registry(file, *files_and_hashes):
 def assert_registry(file, *files_and_hashes):
     assert_file(file, create_registry(files_and_hashes))
     files = [file.name, ".gitattributes"] + [f for f, _, _ in files_and_hashes]
-    assert_file(file.parent / ".gitattributes", "\n".join(f"{f} linguist-generated" for f in files) + "\n")
+    assert_file(file.parent / ".gitattributes", "\n".join(f"/{f} linguist-generated" for f in files) + "\n")
 
 
 def hash(text):

swift/ql/lib/.gitattributes

@@ -1 +1 @@
-swift.dbscheme linguist-generated
+/swift.dbscheme linguist-generated