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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 $CHDIR
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APT_INSTALL="apt-get install -y --no-install-recommends"
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if [ DIST_RELEASE = squeeze ]
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then
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  echo "deb http://backports.debian.org/debian-backports" \
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       "$DIST_RELEASE-backports main contrib non-free" \
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       > $CHDIR/etc/apt/sources.list.d/backports.list
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fi
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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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case $DIST_RELEASE in
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  squeeze)
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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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        libghc6-zlib-dev \
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        hlint hscolour pandoc \
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        graphviz 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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        blaze-builder==0.3.1.1 \
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        network==2.3 \
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        regex-pcre==0.94.4 \
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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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        snap-server==0.8.1 \
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        json==0.4.4 \
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        lifted-base==0.2.1.1
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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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    in_chroot -- \
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      cabal install --global base64-bytestring
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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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;;
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  wheezy)
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    in_chroot -- \
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      $APT_INSTALL \
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      autoconf automake ghc ghc-haddock libghc-network-dev \
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      libghc-test-framework{,-hunit,-quickcheck2}-dev \
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      libghc-json-dev libghc-curl-dev libghc-hinotify-dev \
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      libghc-parallel-dev libghc-utf8-string-dev \
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      libghc-hslogger-dev libghc-crypto-dev \
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      libghc-regex-pcre-dev libghc-attoparsec-dev \
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      libghc-vector-dev libghc-temporary-dev \
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      libghc-snap-server-dev libpcre3 libpcre3-dev hscolour hlint pandoc \
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      libghc6-zlib-dev \
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      libghc-lifted-base-dev \
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      cabal-install\
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      python-setuptools python-sphinx python-epydoc graphviz python-pyparsing \
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      python-simplejson python-pycurl python-paramiko \
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      python-bitarray python-ipaddr python-yaml qemu-utils python-coverage pep8 \
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      shelltestrunner python-dev pylint openssh-client vim git git-email
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    # We need version 0.9.4 of pyinotify because the packaged version, 0.9.3, is
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    # incompatibile with the packaged version of python-epydoc 3.0.1.
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    # Reason: a logger class in pyinotify calculates its superclasses at
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    # runtime, which clashes with python-epydoc's static analysis phase.
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    #
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    # Problem introduced in:
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    #   https://github.com/seb-m/pyinotify/commit/2c7e8f8959d2f8528e0d90847df360
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    # and "fixed" in:
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    #   https://github.com/seb-m/pyinotify/commit/98c5f41a6e2e90827a63ff1b878596
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    in_chroot -- \
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      easy_install pyinotify==0.9.4
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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 base64-bytestring
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;;
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  precise)
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    # ghc, git-email and other dependencies are hosted in the universe
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    # repository, which is not enabled by default.
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    echo "Adding universe repository..."
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    cat > $CHDIR/etc/apt/sources.list.d/universe.list <<EOF
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deb http://archive.ubuntu.com/ubuntu precise universe
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EOF
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    in_chroot -- \
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      apt-get update
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    echo "Installing packages"
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    in_chroot -- \
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      $APT_INSTALL \
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      autoconf automake ghc ghc-haddock libghc-network-dev \
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      libghc-test-framework{,-hunit,-quickcheck2}-dev \
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      libghc-json-dev libghc-curl-dev libghc-hinotify-dev \
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      libghc-parallel-dev libghc-utf8-string-dev \
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      libghc-hslogger-dev libghc-crypto-dev \
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      libghc-regex-pcre-dev libghc-attoparsec-dev \
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      libghc-vector-dev libghc-temporary-dev \
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      libghc-snap-server-dev libpcre3 libpcre3-dev hscolour hlint pandoc \
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      libghc-lifted-base-dev \
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      python-setuptools python-sphinx python-epydoc graphviz python-pyparsing \
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      python-simplejson python-pyinotify python-pycurl python-paramiko \
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      python-bitarray python-ipaddr python-yaml qemu-utils python-coverage pep8 \
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      python-dev pylint openssh-client vim git git-email \
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      build-essential
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    echo "Installing cabal packages"
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    in_chroot -- \
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      $APT_INSTALL cabal-install
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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 shelltestrunner
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    ;;
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  *)
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    in_chroot -- \
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      $APT_INSTALL \
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      autoconf automake ghc ghc-haddock libghc-network-dev \
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      libghc-test-framework{,-hunit,-quickcheck2}-dev \
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      libghc-json-dev libghc-curl-dev libghc-hinotify-dev \
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      libghc-parallel-dev libghc-utf8-string-dev \
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      libghc-hslogger-dev libghc-crypto-dev \
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      libghc-regex-pcre-dev libghc-attoparsec-dev \
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      libghc-vector-dev libghc-temporary-dev \
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      libghc-snap-server-dev libpcre3 libpcre3-dev hscolour hlint pandoc \
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      libghc-lifted-base-dev \
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      python-setuptools python-sphinx python-epydoc graphviz python-pyparsing \
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      python-simplejson python-pyinotify python-pycurl python-paramiko \
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      python-bitarray python-ipaddr python-yaml qemu-utils python-coverage pep8 \
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      shelltestrunner python-dev pylint openssh-client vim git git-email \
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      build-essential
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;;
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esac
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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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  $APT_INSTALL sudo fakeroot rsync locales less socat
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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-openssl openssl \
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               python-mock fping qemu-utils
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in_chroot -- \
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  easy_install affinity
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in_chroot -- \
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  easy_install jsonpointer \
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    jsonpointer \
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    jsonpatch
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in_chroot -- \
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  $APT_INSTALL \
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  python-epydoc 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\""