1 files changed, 3 insertions, 1 deletions
diff --git a/cloudinit/sources/DataSourceSmartOS.py b/cloudinit/sources/DataSourceSmartOS.py
index 843b3a2a..f1f903bc 100644
--- a/cloudinit/sources/DataSourceSmartOS.py
+++ b/cloudinit/sources/DataSourceSmartOS.py
@@ -413,7 +413,9 @@ class JoyentMetadataClient(object):
                 response.append(byte)
             except OSError as exc:
                 if exc.errno == errno.EAGAIN:
-                    raise JoyentMetadataTimeoutException(msg % as_ascii())
+                    raise JoyentMetadataTimeoutException(
+                        msg % as_ascii()
+                    ) from exc
                 raise
 
     def _write(self, msg):