For BFSMerkle, do not truncate the file if it already exists

1 files changed, 1 insertions, 1 deletions

diff --git a/merkle.go b/merkle.go
index ccb348c..1ef55ce 100644
--- a/merkle.go
+++ b/merkle.go
@@ -36,7 +36,7 @@ type BFSMerkle struct {
 }
 
 func NewBFSMerkle(height int64, fname string) *BFSMerkle {
-	file, err := os.Create(fname)
+	file, err := os.OpenFile(fname, os.O_RDWR|os.O_CREATE, 0666)
 	if err != nil {
 		panic(err)
 	}