build_r

#!/bin/bash

# fail fast
set -e

# debug
# set -x

# for checking which version of the build script was used, output to STDOUT
# so that it gets included in the build log output file
echo "#======================================================================"
echo "# $0"
cat $0
echo "#======================================================================"
echo "# Environment"
set
echo "#======================================================================"

R_VERSION="${1:-3.4.0}"
BUILD_NO="${2:-`date +%Y%m%d-%H%M`}"
STACK="${3:-cedar-14}"

# check arguments
if ([ -z "$R_VERSION" ] || [ -z "$BUILD_NO" ] || [ -z "$STACK" ]); then
  echo
  echo "USAGE: $0 VERSION [BUILD_NO] [STACK]"
  echo
  echo "  R_VERSION  Optionally, the R version for apt-get."
  echo "                 Defaults to 3.3.1-1trusty0"
  echo "                 Use \"apt-cache policy r-base\" to obtain valid versions."
  echo
  echo "  BUILD_NO       Optionally, the build number."
  echo "                 Defaults to todays date and current time, in the form \"YYYYMMDD-HHMM\"."
  echo
  echo "  STACK          Optionally, the Heroku stack."
  echo "                 Defaults to cedar-14"
  echo
  exit 1
fi

# helper functions
function topic() {
  echo "-----> $*"
}

function indent() {
  c='s/^/       /'
  case $(uname) in
    Darwin) sed -l "$c";;
    *)      sed -u "$c";;
  esac
}

ARCHIVE="R-$R_VERSION-binaries-$BUILD_NO.tar.gz"
DEBOOTSTRAP_VER=1.0.59
FAKECHROOT_VER=2.18

APP_DIR="/app"
TOOLS_DIR="$APP_DIR/.tools"
CHROOT_DIR="$APP_DIR/.root"
DEBOOTSTRAP_BASE_DIR="$TOOLS_DIR/debootstrap"
DEBOOTSTRAP_DIR="$DEBOOTSTRAP_BASE_DIR/usr/share/debootstrap"
FAKECHROOT_DIR="$TOOLS_DIR/fakechroot"
PATH="$DEBOOTSTRAP_BASE_DIR/usr/sbin:$FAKECHROOT_DIR/sbin:$FAKECHROOT_DIR/bin:$PATH"

# export DEBIAN_FRONTEND=noninteractive
# export TERM=linux
export DEBOOTSTRAP_DIR
export PATH

mkdir -p $APP_DIR
pushd $APP_DIR > /dev/null

#======================================================================
topic 'Installing debootstrap'
mkdir -p $DEBOOTSTRAP_BASE_DIR
curl -L https://launchpad.net/ubuntu/+archive/primary/+files/debootstrap_$DEBOOTSTRAP_VER.tar.xz -o debootstrap.tar.xz
tar xvf debootstrap.tar.xz
pushd debootstrap-$DEBOOTSTRAP_VER > /dev/null
DESTDIR=$DEBOOTSTRAP_BASE_DIR fakeroot make
DESTDIR=$DEBOOTSTRAP_BASE_DIR fakeroot make install
popd > /dev/null

#======================================================================
topic 'Installing fakechroot'
mkdir -p $FAKECHROOT_DIR
git clone -b "$FAKECHROOT_VER" --single-branch --depth 1 https://github.com/dex4er/fakechroot.git
pushd fakechroot > /dev/null
./autogen.sh
./configure --prefix=$FAKECHROOT_DIR
make
make install
popd > /dev/null

#======================================================================
topic 'Installing debootstrap linux'
mkdir -p $CHROOT_DIR
fakechroot fakeroot debootstrap --variant=fakechroot --arch=amd64 trusty $CHROOT_DIR

#======================================================================
topic 'Configuring Linux and installing R $R_VERSION'

BASH_RC_FILE="$CHROOT_DIR/root/.bashrc"
# uncomment line
sed -i -e s/#force_color_prompt=yes/force_color_prompt=yes/ $BASH_RC_FILE

# configure apt
fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'echo "deb http://archive.ubuntu.com/ubuntu trusty main" > /etc/apt/sources.list'

fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'echo "deb http://archive.ubuntu.com/ubuntu trusty-updates main" >> /etc/apt/sources.list'

fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'echo "deb http://archive.ubuntu.com/ubuntu trusty universe" >> /etc/apt/sources.list'

fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'echo "deb http://archive.ubuntu.com/ubuntu trusty-updates universe" >> /etc/apt/sources.list'

fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'echo "deb http://cran.rstudio.com/bin/linux/ubuntu trusty/" >> /etc/apt/sources.list'

# add cran key
fakechroot fakeroot chroot $CHROOT_DIR \
  gpg --keyserver keyserver.ubuntu.com --recv-key E084DAB9

fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'gpg --export E084DAB9 > /var/tmp/E084DAB9 && apt-key add /var/tmp/E084DAB9 && rm /var/tmp/E084DAB9'

fakechroot fakeroot chroot $CHROOT_DIR \
  apt-get update

# prevent warnings about man-db when installing packages
export LD_LIBRARY_PATH="/usr/lib/man-db:$LD_LIBRARY_PATH"

fakechroot fakeroot chroot $CHROOT_DIR \
  apt-get install -y \
    build-essential \
    gfortran \
    libcairo2-dev \
    libcurl4-openssl-dev \
    libgsl0-dev \
    libssl-dev \
    libxt-dev \
    pkg-config \
    r-base-dev=${R_VERSION}* \
    r-recommended=${R_VERSION}*

# install pandoc
fakechroot fakeroot chroot $CHROOT_DIR \
  /bin/sh -c 'curl -L https://github.com/jgm/pandoc/releases/download/1.15.1/pandoc-1.15.1-1-amd64.deb -o pandoc.deb && dpkg -i pandoc.deb && rm pandoc.deb'

fakechroot fakeroot chroot $CHROOT_DIR \
  apt-get clean

# TODO: configure default CRAN mirror (0-cloud)
# echo 'options(repos = c(CRAN = "http://cran.revolutionanalytics.com/"), download.file.method = "libcurl")' >> $CHROOT_DIR/etc/R/Rprofile.site

# install shiny (as it's the most used on Heroku)
fakechroot fakeroot chroot $CHROOT_DIR \
  /usr/bin/R -e "install.packages('shiny', repos='http://cran.rstudio.com/')"

# check
fakechroot fakeroot chroot $CHROOT_DIR \
  /usr/bin/R -e "capabilities()"

exit 0