s6-linux-utils
Software
skarnet.org
 The s6-chroot program 
s6-chroot executes a program in a chroot jail.
 Interface 
     s6-chroot newroot prog...
 -  s6-chroot sets the root filesystem for the current
process to newroot, which must be an existing directory. 
-  s6-chroot changes directory to this new root, and
executes prog
with its arguments. prog is searched under the new root. 
-  s6-chroot's parent process is unaffected by the root change.