From 9d32d4ec16b97007743126c432d00c70c62646db Mon Sep 17 00:00:00 2001
From: Simon Detheridge <s@sd.ai>
Date: Mon, 16 Mar 2020 15:57:37 +0000
Subject: [PATCH] Don't modify 'opts' parameter

---
 services/filestore/app/js/GcsPersistor.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/services/filestore/app/js/GcsPersistor.js b/services/filestore/app/js/GcsPersistor.js
index a78bfce2cd..5a44132882 100644
--- a/services/filestore/app/js/GcsPersistor.js
+++ b/services/filestore/app/js/GcsPersistor.js
@@ -113,7 +113,8 @@ async function sendStream(bucketName, key, readStream, sourceMd5) {
   }
 }
 
-async function getFileStream(bucketName, key, opts = {}) {
+async function getFileStream(bucketName, key, _opts = {}) {
+  const opts = Object.assign({}, _opts)
   if (opts.end) {
     // S3 (and http range headers) treat 'end' as inclusive, so increase this by 1
     opts.end++