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=== Description (from pull-request) ===
Closes #4538.

Signed-off-by: Christian Brauner <[email protected]>
From cea6cf4a14e41a171ff4e92c86aa85024438a826 Mon Sep 17 00:00:00 2001
From: Christian Brauner <[email protected]>
Date: Tue, 8 May 2018 11:58:45 +0200
Subject: [PATCH] container_lxc: fix optional property for disk devs

Closes #4538.

Signed-off-by: Christian Brauner <[email protected]>
---
 lxd/container_lxc.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lxd/container_lxc.go b/lxd/container_lxc.go
index 26376e62e..7b49ca2ec 100644
--- a/lxd/container_lxc.go
+++ b/lxd/container_lxc.go
@@ -7527,6 +7527,10 @@ func (c *containerLXC) insertDiskDevice(name string, m 
types.Device) error {
                return fmt.Errorf("Failed to setup device: %s", err)
        }
 
+       if devPath == "" && shared.IsTrue(m["optional"]) {
+               return nil
+       }
+
        flags := syscall.MS_BIND
        if isRecursive {
                flags |= syscall.MS_REC
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