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=== Description (from pull-request) ===
Closes #4451

Signed-off-by: St├ęphane Graber <stgra...@ubuntu.com>
From a2690c8160bb1f672b7eb048f2f5c4509f9bfb83 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Graber?= <stgra...@ubuntu.com>
Date: Mon, 16 Apr 2018 18:17:48 +0200
Subject: [PATCH] lxd/init: Require root for interactive cluster join
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Closes #4451

Signed-off-by: St├ęphane Graber <stgra...@ubuntu.com>
---
 lxd/main_init_interactive.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lxd/main_init_interactive.go b/lxd/main_init_interactive.go
index 14d9b519f..311b1968d 100644
--- a/lxd/main_init_interactive.go
+++ b/lxd/main_init_interactive.go
@@ -135,6 +135,11 @@ func (c *cmdInit) askClustering(config *initData, d 
lxd.ContainerServer) error {
                                break
                        }
 
+                       // Root is required to access the certificate files
+                       if os.Geteuid() != 0 {
+                               return fmt.Errorf("Joining an existing cluster 
requires root privileges")
+                       }
+
                        // Confirm wiping
                        if !cli.AskBool("All existing data is lost when joining 
a cluster, continue? (yes/no) [default=no] ", "no") {
                                return fmt.Errorf("User aborted configuration")
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