From ea510f30fa9dd38461d37f33e49d344e788a6eeb Mon Sep 17 00:00:00 2001
From: Jarek Kowalski <jaak@jkowalski.net>
Date: Mon, 23 Mar 2020 06:16:12 -0700
Subject: [PATCH] repo: fixed race condition during Open() where we may read
 incomplete file

---
 repo/open.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/repo/open.go b/repo/open.go
index b3f1c43fe..4b6576892 100644
--- a/repo/open.go
+++ b/repo/open.go
@@ -1,12 +1,14 @@
 package repo
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"io/ioutil"
 	"path/filepath"
 	"time"
 
+	"github.com/natefinch/atomic"
 	"github.com/pkg/errors"
 
 	"github.com/kopia/kopia/repo/blob"
@@ -196,7 +198,7 @@ func readAndCacheFormatBlobBytes(ctx context.Context, st blob.Storage, cacheDire
 	}
 
 	if cacheDirectory != "" {
-		if err := ioutil.WriteFile(cachedFile, b, 0600); err != nil {
+		if err := atomic.WriteFile(cachedFile, bytes.NewReader(b)); err != nil {
 			log(ctx).Warningf("warning: unable to write cache: %v", err)
 		}
 	}