From 3af502dad70bfbaee693996ffa0c491793d03f35 Mon Sep 17 00:00:00 2001
From: keks <keks@cryptoscope.co>
Date: Mon, 29 Oct 2018 22:44:39 +0100
Subject: [PATCH] better crash recovery

---
 persist.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/persist.go b/persist.go
index 08c5eb7..4f97afc 100644
--- a/persist.go
+++ b/persist.go
@@ -14,6 +14,16 @@ func Save(f *os.File, v interface{}) error {
 		return errors.Wrapf(err, "error marshaling value of type %T", v)
 	}
 
+	_, err = f.Seek(0, 0)
+	if err != nil {
+		return errors.Wrap(err, "error seeking to beginning of file")
+	}
+
+	err = f.Truncate(0)
+	if err != nil {
+		return errors.Wrap(err, "error truncating file")
+	}
+
 	_, err = f.Write(data)
 	if err != nil {
 		return errors.Wrap(err, "error copying data into file")