#! /bin/bash
mkdir -p /tmp/ovlissue/mountpointtmp
mount -t tmpfs tmpfs /tmp/ovlissue/mountpointtmp

mkdir -p /tmp/ovlissue/mountpointtmp/firstupperdir
mkdir -p /tmp/ovlissue/mountpointtmp/firstworkdir
mkdir -p /tmp/ovlissue/mountpointtmp/firstunion
mount -t overlay overlay -o lowerdir=/,upperdir=/tmp/ovlissue/mountpointtmp/firstupperdir,workdir=/tmp/ovlissue/mountpointtmp/firstworkdir /tmp/ovlissue/mountpointtmp/firstunion

mkdir -p /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp
mount --bind  /tmp/ovlissue/mountpointtmp /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp

mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondupperdir
mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/workdir
mkdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion
mount -t overlay overlay -o lowerdir=/tmp/ovlissue/mountpointtmp/firstunion,upperdir=/tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondupperdir,workdir=/tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/workdir /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion

chroot /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion nonexistantcommand &> /dev/null
umount /tmp/ovlissue/mountpointtmp/firstunion/tmp/ovlissue/mountpointtmp/secondunion