create_builds.sh

#!/bin/bash

shopt -s extglob

# Define supported ROOT and Python versions
ROOT_VERSIONS="5.34.25
6.03.02"
PYTHON_VERSIONS="2.6
2.7
3.3
3.4"

# Download all required ROOT versions, if they've not been downloaded already,
# then extract them in to versioned folders
for RV in $ROOT_VERSIONS; do
  FILENAME=root_v${RV}.source.tar.gz
  UNTAR_DIR=ROOT-${RV}
  # Take the first character of the version string as the major version
  ROOT_MAJOR_VERSION=${RV:0:1}

  if [ -e $FILENAME ]; then
    echo "ROOT version $RV already downloaded, skipping"
  else
    echo "Downloading ROOT version $RV"
    wget ftp://root.cern.ch/root/$FILENAME
    mkdir $UNTAR_DIR
    echo "Extracting in to $UNTAR_DIR"
    tar -C $UNTAR_DIR -xzf root_v${RV}.source.tar.gz
  fi

  # For each Python version, compile ROOT within a virtualenv
  for PV in $PYTHON_VERSIONS; do
    BUILD_DIR=ROOT-${RV}_Python-${PV}
    mkdir $BUILD_DIR
    cp -R $UNTAR_DIR/root* $BUILD_DIR
    cd $BUILD_DIR/root*

    # Create a virtualenv and work within it
    virtualenv -p /usr/bin/python${PV} .env
    . .env/bin/activate

    # Configure and compile ROOT, then install it in to /tmp
    mkdir _build
    cd _build
    cmake .. -Dcxx11=ON -Droofit=ON -Dtmva=ON -Dpython=ON
    make -j4
    . bin/thisroot.sh
    make DESTDIR=/tmp install

    # Deactivate the virtualenv
    deactivate

    # Create the archive for distribution and move it to /vagrant
    # This is accessible from the host machine
    cd /tmp/home/vagrant
    # ROOT 5 and 6 have different installation structures, we
    # normalise them to make use with Travis consistent
    if [ "$ROOT_MAJOR_VERSION" == "5" ]; then
      mv $BUILD_DIR/root/_build/root $BUILD_DIR/root2
      rm -rf $BUILD_DIR/root
      mv $BUILD_DIR/root2 $BUILD_DIR/root
    else
      mv $BUILD_DIR/root-*/_build $BUILD_DIR/root
      rm -rf $BUILD_DIR/root-*
    fi
    tar czf ${BUILD_DIR}.tar.gz $BUILD_DIR
    mv ${BUILD_DIR}.tar.gz /vagrant

    # Go back to where we started
    cd $HOME
    unset BUILD_DIR
  done

  unset ROOT_MAJOR_VERSION
  unset UNTAR_DIR
  unset FILENAME
done

unset PYTHON_VERSIONS
unset ROOT_VERSIONS