From a6db572af6bc792590716856d80e8b9c02a55bec Mon Sep 17 00:00:00 2001
From: Han-Wen Nienhuys <hanwen@google.com>
Date: Wed, 22 Dec 2021 18:11:53 +0000
Subject: refs: print error message in debug output

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs/debug.c b/refs/debug.c
index 791423c..8a6bb15 100644
--- a/refs/debug.c
+++ b/refs/debug.c
@@ -47,7 +47,8 @@ static int debug_transaction_prepare(struct ref_store *refs,
 	transaction->ref_store = drefs->refs;
 	res = drefs->refs->be->transaction_prepare(drefs->refs, transaction,
 						   err);
-	trace_printf_key(&trace_refs, "transaction_prepare: %d\n", res);
+	trace_printf_key(&trace_refs, "transaction_prepare: %d \"%s\"\n", res,
+			 err->buf);
 	return res;
 }
 
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