gistfile1.txt

mount -t tmpfs upper /mnt
mkdir /mnt/{upper,work,newroot}
mount -t overlay overlay -o lowerdir=/,upperdir=/mnt/upper,workdir=/mnt/work /mnt/newroot
cd /mnt/newroot
pivot_root . mnt
# exec chroot . bash
# bash: /mnt/chroot: No such file or directory
# exec /mnt/bin/chroot . bash
# /mnt/bin/chroot: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory
# exec /mnt/bin/busybox chroot . bash
# chroot: can't execute 'bash': No such file or directory
# exec /mnt/bin/bysubox chroot . /mnt/bin/busybox sh
# works but dynamic executables are broken