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#!/bin/bash
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#Configuration
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: ${ARCH:=amd64}
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: ${DIST_RELEASE:=squeeze}
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: ${CONF_DIR:=/etc/schroot/chroot.d}
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: ${CHROOT_DIR:=/srv/chroot}
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: ${ALTERNATIVE_EDITOR:=/usr/bin/vim.basic}
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: ${CHROOT_FINAL_HOOK:=/bin/true}
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# Additional Variables taken from the environmen
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# DATA_DIR
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# CHROOT_EXTRA_DEBIAN_PACKAGES
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#Automatically generated variables
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CHROOTNAME=$DIST_RELEASE-$ARCH
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CHNAME=building_$CHROOTNAME
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TEMP_CHROOT_CONF=$CONF_DIR/$CHNAME.conf
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FINAL_CHROOT_CONF=$CHROOTNAME.conf
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ROOT=`pwd`
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CHDIR=$ROOT/$CHNAME
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USER=`whoami`
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COMP_FILENAME=$CHROOTNAME.tar.gz
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COMP_FILEPATH=$ROOT/$COMP_FILENAME
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TEMP_DATA_DIR=`mktemp -d`
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ACTUAL_DATA_DIR=$DATA_DIR
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ACTUAL_DATA_DIR=${ACTUAL_DATA_DIR:-$TEMP_DATA_DIR}
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#Runnability checks
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if [ $USER != 'root' ]
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then
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  echo "This script requires root permissions to run"
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  exit
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fi
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if [ -f $TEMP_CHROOT_CONF ]
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then
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  echo "The configuration file name for the temporary chroot"
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  echo "  $TEMP_CHROOT_CONF"
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  echo "already exists."
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  echo "Remove it or change the CHNAME value in the script."
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  exit
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fi
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#Create configuration dir and files if they do not exist
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if [ ! -d $ACTUAL_DATA_DIR ]
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then
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  mkdir $ACTUAL_DATA_DIR
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  echo "The data directory"
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  echo "  $ACTUAL_DATA_DIR"
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  echo "has been created."
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fi
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if [ ! -f $ACTUAL_DATA_DIR/final.schroot.conf.in ]
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then
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  cat <<END >$ACTUAL_DATA_DIR/final.schroot.conf.in
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[${CHROOTNAME}]
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description=Debian ${DIST_RELEASE} ${ARCH}
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groups=src
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source-root-groups=root
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type=file
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file=${CHROOT_DIR}/${COMP_FILENAME}
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END
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  echo "The file"
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  echo " $ACTUAL_DATA_DIR/final.schroot.conf.in"
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  echo "has been created with default configurations."
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fi
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if [ ! -f $ACTUAL_DATA_DIR/temp.schroot.conf.in ]
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then
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  cat <<END >$ACTUAL_DATA_DIR/temp.schroot.conf.in
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[${CHNAME}]
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description=Debian ${DIST_RELEASE} ${ARCH}
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directory=${CHDIR}
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groups=src
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users=root
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type=directory
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END
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  echo "The file"
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  echo " $ACTUAL_DATA_DIR/temp.schroot.conf.in"
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  echo "has been created with default configurations."
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fi
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#Stop on errors
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set -e
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#Cleanup
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rm -rf $CHDIR
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mkdir $CHDIR
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#Install tools for building chroots
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apt-get install -y schroot debootstrap
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shopt -s expand_aliases
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alias in_chroot='schroot -c $CHNAME -d / '
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function subst_variables {
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  sed \
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    -e "s/\${ARCH}/$ARCH/" \
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    -e "s*\${CHDIR}*$CHDIR*" \
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    -e "s/\${CHNAME}/$CHNAME/" \
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    -e "s/\${CHROOTNAME}/$CHROOTNAME/" \
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    -e "s*\${CHROOT_DIR}*$CHROOT_DIR*" \
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    -e "s/\${COMP_FILENAME}/$COMP_FILENAME/" \
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    -e "s/\${DIST_RELEASE}/$DIST_RELEASE/" $@
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}
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#Generate chroot configurations
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cat $ACTUAL_DATA_DIR/temp.schroot.conf.in | subst_variables > $TEMP_CHROOT_CONF
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cat $ACTUAL_DATA_DIR/final.schroot.conf.in | subst_variables > $FINAL_CHROOT_CONF
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#Install the base system
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debootstrap --arch $ARCH $DIST_RELEASE $CHDIR
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APT_INSTALL="apt-get install -y --no-install-recommends"
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echo "deb http://backports.debian.org/debian-backports" \
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     "$DIST_RELEASE-backports main contrib non-free" \
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     > $CHDIR/etc/apt/sources.list.d/backports.list
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#Install all the packages
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in_chroot -- \
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  apt-get update
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# do not install libghc6-network-dev, since it's too old, and just
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# confuses the dependencies
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in_chroot -- \
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  $APT_INSTALL \
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    autoconf automake \
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    ghc cabal-install \
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    libghc6-curl-dev \
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    libghc6-parallel-dev \
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    libghc6-text-dev \
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    libghc6-vector-dev \
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    libpcre3-dev \
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    hlint hscolour pandoc \
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    graphviz socat qemu-utils \
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    python-docutils \
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    python-simplejson \
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    python-pyparsing \
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    python-pyinotify \
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    python-pycurl \
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    python-ipaddr \
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    python-yaml \
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    python-paramiko
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in_chroot -- \
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  $APT_INSTALL python-setuptools python-dev build-essential
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in_chroot -- \
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  easy_install \
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    logilab-astng==0.24.1 \
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    logilab-common==0.58.3 \
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    mock==1.0.1 \
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    pylint==0.26.0
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in_chroot -- \
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  easy_install \
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    sphinx==1.1.3 \
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    pep8==1.3.3 \
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    coverage==3.4 \
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    bitarray==0.8.0
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in_chroot -- \
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  cabal update
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in_chroot -- \
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  cabal install --global \
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    network==2.3 \
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    regex-pcre==0.94.2 \
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    hinotify==0.3.2 \
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    hslogger==1.1.4 \
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    quickcheck==2.5.1.1 \
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    attoparsec==0.10.1.1 \
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    crypto==4.2.4 \
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    MonadCatchIO-transformers==0.2.2.0 \
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    mtl==2.0.1.0 \
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    hashable==1.1.2.0 \
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    case-insensitive==0.3 \
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    parsec==3.0.1 \
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    network==2.3 \
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    snap-server==0.8.1 \
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    json==0.4.4
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in_chroot -- \
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  cabal install --global \
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    hunit==1.2.5.2 \
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    happy==1.18.10 \
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    hlint==1.8.43 \
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    hscolour==1.20.3 \
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    temporary==1.1.2.3 \
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    test-framework==0.6.1 \
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    test-framework-hunit==0.2.7 \
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    test-framework-quickcheck2==0.2.12.3
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in_chroot -- \
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  cabal install --global cabal-file-th
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in_chroot -- \
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  cabal install --global shelltestrunner
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#Install selected packages from backports
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in_chroot -- \
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  $APT_INSTALL -t squeeze-backports \
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    git \
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    git-email \
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    vim
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in_chroot -- \
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  $APT_INSTALL sudo fakeroot rsync locales less
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echo "en_US.UTF-8 UTF-8" >> $CHDIR/etc/locale.gen
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in_chroot -- \
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  locale-gen
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in_chroot -- \
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  $APT_INSTALL lvm2 ssh bridge-utils iproute iputils-arping \
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               ndisc6 python python-pyopenssl openssl \
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               python-mock \
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               socat fping
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in_chroot -- \
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  $APT_INSTALL qemu-utils
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in_chroot -- \
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  easy_install affinity
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#Python development tools
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in_chroot -- \
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  $APT_INSTALL python-epydoc
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#Tools for creating debian packages
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in_chroot -- \
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  $APT_INSTALL debhelper quilt
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# extra debian packages
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for package in $CHROOT_EXTRA_DEBIAN_PACKAGES
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do in_chroot -- \
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  $APT_INSTALL $package
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done
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#Set default editor
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in_chroot -- \
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  update-alternatives --set editor $ALTERNATIVE_EDITOR
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# Final user hook
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in_chroot -- $CHROOT_FINAL_HOOK
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rm -f $COMP_FILEPATH
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echo "Creating compressed schroot image..."
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cd $CHDIR
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tar czf $COMP_FILEPATH ./*
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cd $ROOT
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rm -rf $CHDIR
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rm -f $TEMP_CHROOT_CONF
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rm -rf $TEMP_DATA_DIR
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echo "Chroot created. In order to run it:"
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echo " * Copy the file $FINAL_CHROOT_CONF to $CONF_DIR/$FINAL_CHROOT_CONF"
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echo " * Copy the file $COMP_FILEPATH to $CHROOT_DIR/$COMP_FILENAME"
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echo "Then run \"schroot -c $CHROOTNAME\""