From f3719fe2694d33cb60d92170656bd144b5498c50 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Sat, 15 Jun 2019 10:42:53 +0100
Subject: [PATCH] fs/cache: unlock mutex in cache.Get to allow recursive calls

This fixes the test lockup in the union tests
---
 fs/cache/cache.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/cache/cache.go b/fs/cache/cache.go
index ce331ca66..569209834 100644
--- a/fs/cache/cache.go
+++ b/fs/cache/cache.go
@@ -30,7 +30,9 @@ func Get(fsString string) (f fs.Fs, err error) {
 	defer fsCacheMu.Unlock()
 	entry, ok := fsCache[fsString]
 	if !ok {
+		fsCacheMu.Unlock() // Unlock in case Get is called recursively
 		f, err = fsNewFs(fsString)
+		fsCacheMu.Lock()
 		if err != nil && err != fs.ErrorIsFile {
 			return f, err
 		}