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    Command:

    pivot_root

    
    
    

    SYNOPSIS

           pivot_root new_root put_old
    
    
    

    DESCRIPTION

           pivot_root  moves  the  root  file system of the current process to the
           directory put_old and makes new_root the new root file  system.   Since
           pivot_root(8)  simply  calls pivot_root(2), we refer to the man page of
           the latter for further details.
    
           Note that, depending on the implementation of pivot_root, root and  cwd
           of  the  caller  may or may not change. The following is a sequence for
           invoking pivot_root that works in either case, assuming that pivot_root
           and chroot are in the current PATH:
    
           cd new_root
           pivot_root . put_old
           exec chroot . command
    
           Note that chroot must be available under the old root and under the new
           root, because pivot_root may or may not  have  implicitly  changed  the
           root directory of the shell.
    
           Note  that  exec chroot changes the running executable, which is neces-
           sary if the old root directory should be  unmounted  afterwards.   Also
           note that standard input, output, and error may still point to a device
           on the old root file system,  keeping  it  busy.  They  can  easily  be
           changed  when  invoking  chroot (see below; note the absence of leading
           slashes to make it work whether pivot_root has changed the shell's root
           or not).
    
    
    

    EXAMPLES

           Change the root file system to /dev/hda1 from an interactive shell:
    
           mount /dev/hda1 /new-root
           cd /new-root
           pivot_root . old-root
           exec chroot . sh <dev/console >dev/console 2>&1
           umount /old-root
    
           Mount  the new root file system over NFS from 10.0.0.1:/my_root and run
           init:
    
           ifconfig lo 127.0.0.1 up   # for portmap
           # configure Ethernet or such
           portmap   # for lockd (implicitly started by mount)
           mount -o ro 10.0.0.1:/my_root /mnt
           killall portmap   # portmap keeps old root busy
           cd /mnt
           pivot_root . old_root
           exec chroot . sh -c 'umount /old_root; exec /sbin/init' \
             <dev/console >dev/console 2>&1
    
    
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