From e6bd88878e8fc08652b77f0444adcd74321dc6b6 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 13 Dec 2019 18:58:34 +0100
Subject: [PATCH] Improve gzip error message

---
 src/libutil/compression.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libutil/compression.cc b/src/libutil/compression.cc
index 17b506d5d..860b04adb 100644
--- a/src/libutil/compression.cc
+++ b/src/libutil/compression.cc
@@ -90,8 +90,8 @@ struct GzipDecompressionSink : CompressionSink
 
             int ret = inflate(&strm,Z_SYNC_FLUSH);
             if (ret != Z_OK && ret != Z_STREAM_END)
-                throw CompressionError("error while decompressing gzip file: %d: %d: %d",ret, len, strm.avail_in);
-
+                throw CompressionError("error while decompressing gzip file: %d (%d, %d)",
+                    zError(ret), len, strm.avail_in);
 
             finished = ret == Z_STREAM_END;