From 38a254286953f5acdb13fdfcd50132aefafb1a75 Mon Sep 17 00:00:00 2001
From: Timo Sirainen <timo.sirainen@dovecot.fi>
Date: Mon, 22 Aug 2016 16:13:32 +0300
Subject: [PATCH] fs-metawrap: Added assert to make sure we don't create empty
 files.

It seems like this could be happening in some situation.
---
 src/lib-fs/fs-metawrap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/lib-fs/fs-metawrap.c b/src/lib-fs/fs-metawrap.c
index 9110c9202e..6c89383874 100644
--- a/src/lib-fs/fs-metawrap.c
+++ b/src/lib-fs/fs-metawrap.c
@@ -410,6 +410,9 @@ static int fs_metawrap_write_stream_finish(struct fs_file *_file, bool success)
 		ret = -1;
 	} else {
 		i_assert(i_stream_is_eof(input));
+		/* because of the "end of metadata" LF, there's always at least
+		   1 byte */
+		i_assert(file->super_output->offset > 0);
 		ret = fs_write_stream_finish(_file->parent, &file->super_output);
 	}
 	i_stream_unref(&input);