Based on 23f25b1496c31ef4c20b8f3ee8328f7b1d5f3a54 Mon Sep 17 00:00:00 2001
From: Dan Dedrick <dan.dedrick@gmail.com>
Date: Tue, 29 Jul 2014 15:31:23 -0400
Subject: [PATCH] switch-root: umount the old root correctly

The unmount occurs after the pivot_root, so the path used to unmount
should take into account the new root directory. This will allow the
umount to actually succeed.
---
 src/core/switch-root.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- src/core/switch-root.c
+++ src/core/switch-root.c	2014-08-22 11:22:50.230735231 +0000
@@ -122,9 +122,9 @@ int switch_root(const char *new_root) {
 
                 /* Immediately get rid of the old root. Since we are
                  * running off it we need to do this lazily. */
-                if (umount2(temporary_old_root, MNT_DETACH) < 0) {
+                if (umount2("/mnt", MNT_DETACH) < 0) {
                         r = -errno;
-                        log_error("Failed to umount old root dir %s: %m", temporary_old_root);
+                        log_error("Failed to umount old root dir /mnt: %m");
                         goto fail;
                 }
 
