add error trace

csst_common/pipeline.py

@@ -54,6 +54,7 @@ class Pipeline:
         self.message = Message(os.path.join(self.dir_out, "msg.txt"))
         self.time_stamp = TimeStamp(os.path.join(self.dir_out, "time_stamp.txt"))
         self.exit_code = ExitCode(os.path.join(self.dir_out, "exit_code"))
+        self.error_trace = ErrorTrace(os.path.join(self.dir_out, "error_trace"))
 
         if dfs:
             self.dfs = DFS(n_try=5)
@@ -101,6 +102,18 @@ class Pipeline:
         warnings.resetwarnings()
 
 
+class ErrorTrace:
+    def __init__(self, file_path=""):
+        self.file_path = file_path
+
+    def __repr__(self):
+        return f"< ErrorTrace [{self.file_path}] >"
+
+    def write(self, s: str):
+        with open(self.file_path, "w+") as f:
+            f.write(s)
+
+
 class Message:
     def __init__(self, file_path=""):
         self.file_path = file_path