Handle failure case when converting abspath to relpath

python · Jul 4, 2020 · 03f4b42 · 03f4b42
1 parent c1f7d1e
commit 03f4b42
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/mypy/build.py b/mypy/build.py
@@ -2807,11 +2807,16 @@ def load_graph(sources: List[BuildSource], manager: BuildManager,
 
                         if seen_state is None:
                             if os.path.isabs(newst_path):
-                                newst_path = os.path.relpath(newst_path)
+                                try:
+                                    newst_path = os.path.relpath(newst_path)
+                                except ValueError:
+                                    # Ignore when newst_path does not start with os.curdir
+                                    pass
+                                else:
+                                    seen_state = seen_files.get(newst_path)
                             else:
                                 newst_path = os.path.abspath(newst_path)
-
-                            seen_state = seen_files.get(newst_path)
+                                seen_state = seen_files.get(newst_path)
 
                         if seen_state is not None:
                             manager.errors.report(