#!/bin/bash

# Script to facilitate building r-base binaries for CRAN in a chroot
# Matching CRAN sources must be in /etc/apt/sources.list of the chroot

usage()
{
echo "Usage: ./build [options] sourcepackage"
echo "Options:"
echo " -s, --skip    Skip apt-get update/upgrade and pbuilder update"
}

DIST=`lsb_release -cs`

skip=false
while test -n "${1}"; do
  case "$1" in
    -s | --skip)
      skip=true
      shift
      ;;
    -*)
      echo "Error: Unknown option: $1" >&2
      usage
      exit 1
      ;;
    *) # No more options
      break
      ;;
  esac
done

# Positional argument
if [ $# -lt 1 ]; then usage; exit 1; fi
pkg=$1

if ls $pkg-* 1> /dev/null 2>&1
then
  echo "Please check if sources from previous backport or build need to be cleaned up"
  exit 1
fi

if [ "$skip" = false ]
then
  apt-get update
  apt-get upgrade
fi
apt-get build-dep $pkg
apt-get source $pkg

# Move sources to $DIST directory to enable parallel builds
mkdir -p $DIST
mv $pkg\_* $DIST
mv $pkg-* $DIST

cd $DIST/$pkg-*

dpkg-buildpackage -B

cd ../..

keep=false # We do not want to keep local sources for binary builds
# Clean sources from $DIST directory
if [ "$keep" = false ]
then
  rm -f $DIST/$pkg\_*.{dsc,changes,diff.gz,tgz,tar.gz,tar.xz}
  #rm -rf $DIST/$pkg-* # This removes e.g. r-base-core* debs which is not intended
fi