Merge lp:~rbalint/livecd-rootfs/mount-make-rslave

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.460) UNRELEASED; urgency=medium
+
+  [ Balint Reczey ]
+  * Mount using --make-rslave to ensure safe unmounts for rbind mounts
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 26 Sep 2017 00:59:08 -0400
+
 livecd-rootfs (2.459) artful; urgency=medium
 
   [ Steve Langasek ]

live-build/functions

@@ -79,7 +79,7 @@ mount_image() {
 setup_mountpoint() {
     local mountpoint="$1"
 
-    mount --rbind /dev "$mountpoint/dev"
+    mount --rbind --make-rslave /dev "$mountpoint/dev"
     mount proc-live -t proc "$mountpoint/proc"
     mount sysfs-live -t sysfs "$mountpoint/sys"
     mount -t tmpfs none "$mountpoint/tmp"