saving uncommitted changes in /etc prior to emerge run

init.d/localmount

@@ -1,4 +1,4 @@
-#!/sbin/runscript
+#!/sbin/openrc-run
 # Copyright (c) 2007-2009 Roy Marples <roy@marples.name>
 # Released under the 2-clause BSD license.
 
@@ -9,7 +9,7 @@ depend()
 	need fsck
 	use lvm modules mtab
 	after lvm modules
-	keyword -jail -prefix -vserver -lxc
+	keyword -jail -prefix -systemd-nspawn -vserver -lxc
 }
 
 start()
@@ -59,10 +59,35 @@ stop()
 	no_umounts_r="^($no_umounts_r)$"
 
 	# Flush all pending disk writes now
-	sync; sync
+	sync
 
 	. "$RC_LIBEXECDIR"/sh/rc-mount.sh
 
+	if [ "$RC_UNAME" = Linux ] && [ -d /sys/fs/aufs ] ; then
+		#if / is aufs we remount it noxino during shutdown
+		if mountinfo -q -f '^aufs$' / ; then
+			mount -o remount,noxino,rw /
+			sync
+		fi
+
+		local aufs_branch aufs_mount_dir aufs_mount_point aufs_si_dir aufs_si_id
+		for aufs_si_dir in /sys/fs/aufs/*; do
+			aufs_mount_dir=${aufs_si_dir#/sys/fs/aufs/}
+			aufs_si_id="$(printf "%s" $aufs_mount_dir | sed 's/_/=/g')"
+			aufs_mount_point="$(mountinfo -o ${aufs_si_id})"
+			for x in $aufs_si_dir/br[0-9][0-9][0-9]; do
+				aufs_branch=$(sed 's/=.*//g' $x)
+				eindent
+				if ! mount -o "remount,del:$aufs_branch" "$aufs_mount_point" > /dev/null 2>&1; then
+					ewarn "Failed to remove branch $aufs_branch from aufs \
+						$aufs_mount_point"
+				fi
+				eoutdent
+				sync
+			done
+		done
+	fi
+
 	# Umount loop devices
 	einfo "Unmounting loop devices"
 	eindent