Provided by: sbuild_0.44_all bug


       sbuild-setup - sbuild setup procedure


       sbuild  uses chroots to build packages within, to provide a minimal and
       consistent build environment.  This man page describes the procedure to
       create  a chroot by hand using debootstrap.  These are only guidelines;
       depending upon the setup required, several of the steps may be  omitted

       A  number of the steps below are automatically run by the buildd.chroot
       script.  See the section “buildd.chroot” below.


       This guide sets up a sarge chroot on a  powerpc  machine.   Adjust  the
       names for other suites and architectures.

   1. Run debootstrap to create the chroot
       # mkdir -p /srv/chroot/sarge

       The  author  has  each  chroot  as  a separate LVM logical volume (LV).
       Create and mount an LV here if required:

       # lvcreate -L 4G -n sarge_chroot -Z y hda_vg

       Add to /etc/fstab and mount (see next section for full fstab  example).
       Finally, run debootstrap to create the chroot:

       #         debootstrap         --variant=buildd        /srv/chroot/sarge

   2. Set up additional mounts
       An example /etc/fstab:

       /dev//hda_vg/sarge_chroot \
                     /srv/chroot/sarge              ext3    defaults   0   2
       /dev/pts      /srv/chroot/sarge/dev/pts      none    rw,bind    0   0
       tmpfs         /srv/chroot/sarge/dev/shm      tmpfs   defaults   0   0
       proc          /srv/chroot/sarge/proc         proc    defaults   0   0
       /dev/hda_vg/home \
                     /srv/chroot/sarge/home         ext3    quota      0   0
       /tmp          /srv/chroot/sarge/tmp          none    rw,bind    0   0
       /etc/passwd   /srv/chroot/sarge/etc/passwd   none    ro,bind    0   0
       /etc/shadow   /srv/chroot/sarge/etc/shadow   none    ro,bind    0   0
       /etc/group    /srv/chroot/sarge/etc/group    none    ro,bind    0   0
       /etc/resolv.conf \
                     /srv/chroot/sarge/etc/resolv.conf \
                                                    none    ro,bind    0   0

       If the bind mountpoints don’t exist in the chroot, touch them:

       # touch /srv/chroot/sarge/etc/resolv.conf

       Next, mount them all.

       Depending on your kernel version and security considerations,  you  may
       wish  to  do  this  part slightly differently.  With a Linux kernel, at
       least  version  2.6  is  required   for   bind   mounts,   and   devpts
       (CONFIG_UNIX98_PTYS)  for /dev/pts.  Other guides recommend copying the
       files, but this method keeps them up-to-date at no cost.

       If using sbuild with schroot, passwd, shadow, group and resolv.conf can
       be  updated  automatically  at the start of each build, so no action is
       required here.  schroot can also automatically mount all of  the  extra
       filesystems, so all the other mounts may be omitted.

       To  disable  networking,  don’t bind mount /etc/resolv.conf.  This will
       prevent APT from  working  inside  the  chroot,  but  prevents  package
       building from having working network access (no nameservers).

   3. Edit sources.list
       Create  or edit /srv/chroot/sarge/etc/apt/sources.list, and add all the
       APT sources required to obtain binary  and  source  packages  for  your
       chosen distribution:

       deb sarge/updates main
       deb-src sarge/updates main

       deb sarge main
       deb-src sarge main

   4. Configure dchroot or schroot
       This  is entirely optional, but will make the chroot environment easier
       to access and administer.

       For dchroot, add the following line to /etc/dchroot.conf:

       sarge /srv/chroot/sarge

       For schroot, add the a group to /etc/schroot/schroot.conf, for example:

       description=Debian sarge (stable)

   5. Log into chroot
       # dchroot -c sarge


       $ schroot -c sarge -u root

   6. Set up packages for sbuild
       While running as root inside the chroot:

       # apt-get update
       # apt-get dist-upgrade
       # apt-get install debconf
       # dpkg-reconfigure -plow debconf

       Answer the debconf questions as follows:

              choose 6/Noninteractive

              choose 1/Critical

       You  only  need  to  run  dpkg-reconfigure  if  you  weren’t  asked the
       questions during the  debconf  install.   Next,  install  the  packages
       required for building packages:

       # apt-get install sudo debfoster fakeroot build-essential
       # apt-get install makedev
       # cd /dev/
       # /sbin/MAKEDEV generic
       # touch /etc/mtab

       For  some  security,  we don’t bind mount /dev, so it can’t access e.g.
       USB devices

   7. sbuild setup
       While running as root inside the chroot:

       # mkdir /build
       # chown root:sbuild /build
       # mkdir -p /var/lib/sbuild/srcdep-lock
       # chown -R root:sbuild /var/lib/sbuild
       # chmod -R 02775 /var/lib/sbuild

       Note that when using sbuild with schroot, this setup  is  done  at  the
       start of each build, so is not required here.

   8. Finished
       Congratulations!    You   should   now  have  a  fully  configured  and
       operational chroot.


       This script, located  in  /usr/share/sbuild  will  automatically  do  a
       number of the steps described above, including:

       ·      Running debootstrap.

       ·      Setting up APT sources in /etc/apt/sources.list.

       ·      Setting up a minimal /etc/passwd

       ·      Setting up /build and /var/lib/sbuild with appropriate ownership
              and permissions.

       After it has done this, you do still need  to  do  some  manual  setup,
       completing the steps it missed out above, for example.


   1. ~/.sbuildrc
       Configure the user’s ~.sbuildrc:

       $ cp /usr/share/doc/sbuild/examples/example.sbuildrc ~/.sbuildrc

       Edit  to  set  the  correct  mail address to send log files to, and the
       correct maintainer name and/or uploader name.

   2. Build directories
       Create  the  required  build  directories  (The  .sbuildrc   may   have
       configured different locations; these are the defaults):

       $ mkdir ~/build ~/logs

   3. Chroot setup
       As root, run:

       # /usr/share/sbuild/add_sbuild_user /srv/chroot/sarge stable <username>

       Follow the instructions displayed, and update ~/build etc. as shown.

   4. sudo setup
       If using sbuild with sudo (chroot_mode “split”), sudo needs configuring
       to  give  the  user  permission  to  install and remove packages in the
       chroot, which requires root priveleges.  Add  the  following  lines  to

       username  ALL=NOPASSWD: ALL
       Defaults:username env_keep+="APT_CONFIG DEBIAN_FRONTEND"

       where   username  is  the  name  of  the  user  who  will  run  sbuild.
       /etc/sudoers inside the chroot also needs the same modifications.

   5. Finished
       You should now be able to run sbuild.

       $ cd ~/build
       $ sbuild ...


              A script to automatically create and configure  a  chroot  using


       Roger Leigh.


       Copyright © 2005-2006  Roger Leigh <>

       This program 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 2 of the License, or (at your
       option) any later version.


       debootstrap(1), sbuild(1).