From 4bbf4d47fa27b30db7d8a54f4d5b45a2259131ed Mon Sep 17 00:00:00 2001
From: "Michael.Schmatz" <Michael.Schmatz@dsit.gov.uk>
Date: Fri, 20 Sep 2024 12:30:18 +0000
Subject: [PATCH] Preserve exception information

---
 src/inspect_ai/log/_file.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/inspect_ai/log/_file.py b/src/inspect_ai/log/_file.py
index d5c60edc8..3a211fbfb 100644
--- a/src/inspect_ai/log/_file.py
+++ b/src/inspect_ai/log/_file.py
@@ -248,7 +248,7 @@ def read_eval_log(log_file: str | FileInfo, header_only: bool = False) -> EvalLo
             ):
                 pass
             else:
-                raise ValueError(f"Unable to read log file: {log_file}: {ex}")
+                raise ValueError(f"Unable to read log file: {log_file}") from ex
 
     # parse full log (also used as a fallback for header_only encountering NaN or Inf)
     with file(log_file, "r") as f: