Provided by: schroot_1.6.8-1ubuntu1_amd64 bug


       schroot-setup - schroot chroot setup scripts


       schroot  uses  scripts  to set up and then clean up the chroot environment.  The directory
       /etc/schroot/setup.d contains scripts run when a chroot is created and destroyed.  Several
       environment  variables  are  set  while  the  scripts  are  being  run, which allows their
       behaviour to be customised, depending upon, for example, the type of chroot in use.

       The scripts are run in name order, like those run by init(8), by using the same  style  of
       execution as run-parts(8).

       The setup scripts are all invoked with two options:

       1      The action to perform.

              When  a  session  is  first started, the chroot is set up by running the scripts in
              /etc/schroot/setup.d with the ‘setup-start’ option.  When the session is ended, the
              scripts  in  /etc/schroot/setup.d  are  run  in reverse order with the ‘setup-stop’

       2      The chroot status.

              This is either ‘ok’ if there are no problems, or ‘fail’ if  something  went  wrong.
              For example, particular actions may be skipped on failure.

       Note  that  the  scripts  should  be  idempotent.   They  must  be  idempotent  during the
       ‘setup-stop’ phase, because they may be run more than once, for example on failure.


   General variables
              The username of the user the command in the chroot will run as.

              The chroot name.  Note that this is the name of the orignal chroot  before  session
              creation; you probably want SESSION_ID.




              The  host  system  architecture  schroot  is  running  upon.   This  may be used to
              introduce architecture-specific behaviour into the setup  scripts  where  required.
              HOST  is  the  GNU  triplet  for  the  architecture, while HOST_OS, HOST_VENDOR and
              HOST_CPU are the component parts of the triplet.

              The directory under which helper programs are located.

              The directory under which non-filesystem chroots are mounted  (e.g.  block  devices
              and LVM snapshots).

       PID    The process ID of the schroot process.

              The  operating  system  platform  schroot  is  running  upon.   This may be used to
              introduce platform-specific behaviour into the setup scripts where required.   Note
              that the HOST variables are probably what are required.  In the context of schroot,
              the platform is the supported configuration and behaviour for a given architecture,
              and may be identical between different architectures.

              The session identifier.

              Set to ‘quiet’ if only error messages should be printed, ‘normal’ if other messages
              may be printed as well, and ‘verbose’ if all messages may be  printed.   Previously
              called AUTH_VERBOSITY.

              Set to ‘true’ if a session will be created, otherwise ‘false’.

              Set to ‘true’ if a session will be cloned, otherwise ‘false’.

              Set to ‘true’ if a session will be purged, otherwise ‘false’.

              The  type of the chroot.  This is useful for restricting a setup task to particular
              types of chroot (e.g. only block devices or LVM snapshots).

              The name of the chroot.   This  is  useful  for  restricting  a  setup  task  to  a
              particular chroot, or set of chroots.

              The name of the alias used to select the chroot.  This is useful for specialising a
              setup task based upon one of its alternative alias names,  or  the  default  chroot
              name.    For   example,   it  could  be  used  to  specify  additional  sources  in
              /etc/apt/sources.list, such as a stable-security alias for a stable chroot,  or  an
              experimental alias for an unstable chroot.

              The description of the chroot.

              The  location  to  mount  the  chroot.   It  is  used  for mount point creation and

              The location of the chroot inside the mount  point.   This  is  to  allow  multiple
              chroots on a single filesystem.  Set for all mountable chroot types.

              The  absolute  path  to  the  chroot.   This is typically CHROOT_MOUNT_LOCATION and
              CHROOT_LOCATION concatenated together.  This is the path which should  be  used  to
              access the chroots.

   Plain and directory chroot variables
       These chroot types use only general variables.

   File variables
              The file containing the chroot files.

              Set  to  ‘true’  to  repack  the  chroot  into an archive file on ending a session,
              otherwise ‘false’.

   Mountable chroot variables
       These variables are only set for directly mountable chroot types.

              The device to mount containing the chroot.  mounting.

              Options to pass to mount(8).

              The location of the chroot inside the mount point.  This allows  the  existence  of
              multiple chroots on a single filesystem.

   Filesystem union variables
              Union filesystem type.

              Union filesystem mount options.

              Union filesystem overlay directory (writable).

              Union filesystem underlay directory (read-only).

   Block device variables
              The  device  containing  the  chroot  root  filesystem.   This  is usually, but not
              necessarily, the device which will be mounted.  For example, an LVM  snapshot  this
              will be the original logical volume.

   LVM snapshot variables
              Snapshot name to pass to lvcreate(8).

              The name of the LVM snapshot device.

              Options to pass to lvcreate(8).

   Custom variables
       Custom keys set in schroot.conf will be uppercased and set in the environment as described
       in schroot.conf(5).


   Setup script configuration
       The directory /etc/schroot/default contains the default settings used by setup scripts.

       config Main configuration file read  by  setup  scripts.   The  format  of  this  file  is
              described   in  schroot-script-config(5).   This  is  the  default  value  for  the
              script-config key.  Note that this was formerly named /etc/schroot/script-defaults.
              The following files are referenced by default:

              A  list  of files to copy into the chroot from the host system.  Note that this was
              formerly named /etc/schroot/copyfiles-defaults.

       fstab  A file in the format decribed in fstab(5), used to  mount  filesystems  inside  the
              chroot.   The mount location is relative to the root of the chroot.  Note that this
              was formerly named /etc/schroot/mount-defaults.

              System databases (as described in /etc/nsswitch.conf on GNU/Linux systems) to  copy
              into   the   chroot   from   the   host.    Note   that  this  was  formerly  named

   Setup scripts
       The directory /etc/schroot/setup.d contains the chroot setup scripts.

              Print debugging diagnostics and perform basic sanity checking.

       05file Unpack, clean up, and repack file-based chroots.

              Create and remove union filesystems.

       05lvm  Create and remove LVM snapshots.

              Mount and unmount filesystems.

              Sets up the QEMU user emulator using binfmt-support.  This permits a chroot  for  a
              different  CPU  architecture  to be used transparently, providing an alternative to
              cross-compiling or whole-machine emulation.

              Kill processes still running inside the chroot when ending a session,  which  would
              prevent unmounting of filesystems and cleanup of any other resources.

              Copy  files  from the host system into the chroot.  Configure networking by copying
              hosts and resolv.conf, for example.

              Configure system databases by copying passwd, shadow, group etc. into the chroot.

              Set the chroot name (/etc/debian_chroot) in the chroot.  This may be  used  by  the
              shell prompt to display the current chroot.


       Roger Leigh.


       Copyright © 2005-2012  Roger Leigh <>

       schroot  is free software: you can redistribute it and/or modify it under the terms of the
       GNU General Public License as published by the Free Software Foundation, either version  3
       of the License, or (at your option) any later version.


       schroot(1), fstab(5), schroot.conf(5), schroot-script-config(5), run-parts(8).