switch_root - switch to another filesystem as the root of the mount tree
switch_root newroot init [arg...]
switch_root moves already mounted /proc, /dev, /sys
and /run to newroot and makes newroot the new root
filesystem and starts init process.
WARNING: switch_root removes recursively all files and
directories on the current root filesystem.
Display help text and exit.
Display version information and exit.
switch_root returns 0 on success and 1 on failure.
switch_root will fail to function if newroot is not the root of a
mount. If you want to switch root into a directory that does not meet this
requirement then you can first use a bind-mounting trick to turn any directory
into a mount point:
Peter Jones <email@example.com>, Jeremy Katz
<firstname.lastname@example.org>, Karel Zak <email@example.com>