From 08d97cf0258e92d82850fcc56f608008cc39d04f Mon Sep 17 00:00:00 2001
From: tstromberg <tstromberg@google.com>
Date: Tue, 6 Aug 2019 16:01:06 -0700
Subject: [PATCH] Use a temp dest to atomically download the iso

---
 pkg/util/downloader.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pkg/util/downloader.go b/pkg/util/downloader.go
index 6a6059110edb..81d951276a2d 100644
--- a/pkg/util/downloader.go
+++ b/pkg/util/downloader.go
@@ -65,10 +65,14 @@ func (f DefaultDownloader) CacheMinikubeISOFromURL(url string) error {
 		urlWithChecksum = url + "?checksum=file:" + constants.DefaultISOSHAURL
 	}
 
+	dst := f.GetISOCacheFilepath(url)
+	// Predictable temp destination so that resume can function
+	tmpDst := dst + ".download"
+
 	opts := []getter.ClientOption{getter.WithProgress(defaultProgressBar)}
 	client := &getter.Client{
 		Src:     urlWithChecksum,
-		Dst:     f.GetISOCacheFilepath(url),
+		Dst:     tmpDst,
 		Mode:    getter.ClientModeFile,
 		Options: opts,
 	}
@@ -78,7 +82,7 @@ func (f DefaultDownloader) CacheMinikubeISOFromURL(url string) error {
 	if err := client.Get(); err != nil {
 		return errors.Wrap(err, url)
 	}
-	return nil
+	return os.Rename(tmpDst, dst)
 }
 
 // ShouldCacheMinikubeISO returns if we need to download the ISO