From 0948343a6fd4efce07894c312d8e96c5f277c608 Mon Sep 17 00:00:00 2001
From: Ethan Buchman <ethan@coinculture.info>
Date: Mon, 2 Oct 2017 14:17:16 -0400
Subject: [PATCH] autofile: ensure file is open in Sync

---
 autofile/autofile.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/autofile/autofile.go b/autofile/autofile.go
index 5d6bc7261..05fb0d677 100644
--- a/autofile/autofile.go
+++ b/autofile/autofile.go
@@ -103,6 +103,11 @@ func (af *AutoFile) Sync() error {
 	af.mtx.Lock()
 	defer af.mtx.Unlock()
 
+	if af.file == nil {
+		if err := af.openFile(); err != nil {
+			return err
+		}
+	}
 	return af.file.Sync()
 }