adt-virt-chroot(1) [debian man page]

adt-virt-chroot(1)					     Linux Programmer's Manual						adt-virt-chroot(1)

NAME

       adt-virt-chroot - autopkgtest virtualisation server using a chroot

SYNOPSYS

       adt-virt-chroot [options] =[chroot-name]
       adt-virt-chroot [options] [-rgain-root-cmd] /path/to/chroot

DESCRIPTION

       adt-virt-chroot provides an autopkgtest virtualisation server using a chroot install (or similar).

       Normally adt-virt-chroot will be invoked by adt-run.

       The  chroot to use must be specified.  If it starts with a = character then it is taken to be a chroot name known to dchroot(8).  Otherwise
       it must start with a / and will be taken to an absolute path.

OPTIONS

       --gain-root|-r gain-root-cmd
	      Specifies that adt-virt-chroot can become root (on the host) by prefixing its commands with gain-root-cmd.  The command may  consist
	      of  several words separated by whitespace, in which case words other than the first are supplied as additional arguments to the com-
	      mand; other shell (or other) metacharacters in gain-root-cmd are not interpreted or modified by adt-virt-chroot.	The actual command
	      to be run as root, and its arguments, are supplied as additional (separate) arguments to gain-root-cmd.

	      Root  privilege is needed, to successfully run chroot(8), if the chroot to use is specified as an absolute path.	The default is not
	      to take any special action when root will be needed, in which case for an absolute path chroot, adt-virt-chroot must be  started	as
	      root.

       -d | --debug
	      Enables debugging output.  Probably not hugely interesting.

INPUT, OUTPUT AND EXIT STATUS
       The behaviour of adt-virt-chroot is as described by the AutomatedTesting virtualisation regime specification.

SEE ALSO

       adt-run(1), adt-virt-null(1), adt-virt-xenlvm(1), /usr/share/doc/autopkgtest/.

AUTHORS AND COPYRIGHT

       This  manpage  is part of autopkgtest, a tool for testing Debian binary packages.  autopkgtest is Copyright (C) 2006-2007 Canonical Ltd and
       others.

       See /usr/share/doc/autopkgtest/CREDITS for the list of contributors and full copying conditions.

autopkgtest							       2007							adt-virt-chroot(1)

PIVOT_ROOT(8)						       Maintenance Commands						     PIVOT_ROOT(8)

NAME

       pivot_root - change the root file system

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 necessary 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

SEE ALSO

       chroot(1), mount(8), pivot_root(2), umount(8)

Linux								   Feb 23, 2000 						     PIVOT_ROOT(8)