From 4a5911e8d49e205bc777e30c685eb5a5da2dbc7f Mon Sep 17 00:00:00 2001
From: Przemek Rudy <prudy1@o2.pl>
Date: Wed, 29 Jul 2015 19:41:28 +0200
Subject: [PATCH] Prevent from error on umount /proc if userns are used.

Signed-off-by: Przemek Rudy <prudy1@o2.pl>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
---
 src/lxc/conf.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index ecbf24266..e3eaf15c8 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -1368,10 +1368,8 @@ int prepare_ramfs_root(char *root)
 			break;
 	}
 
-	if (umount2("./proc", MNT_DETACH)) {
-		SYSERROR("Unable to umount /proc");
-		return -1;
-	}
+	/* This also can be skipped if a container uses unserns */
+	umount2("./proc", MNT_DETACH);
 
 	/* It is weird, but chdir("..") moves us in a new root */
 	if (chdir("..") == -1) {
-- 
2.47.3