prepare_chrome

!/bin/bash
#
# Downloads the appropriate Chrome driver for this system.
#

BASEDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
BIN_DIR="${BASEDIR}/../bin"

ARCH=`uname -m`
PLATFORM=`uname -s`

DRIVER_NAME="chromedriver_{{arch}}.zip"
DRIVER_URL="http://chromedriver.storage.googleapis.com"
DRIVER_VERSION=`curl -sS ${DRIVER_URL}/LATEST_RELEASE`

if [ -x "${BIN_DIR}/chromedriver" ]; then
	echo "Chrome driver already present."
	exit 0
fi

if [ "$?" != 0 -o -z "${DRIVER_VERSION}" ]; then
	echo "Failed to determine the latest version of the Chrome driver."
	exit 1
fi

if [ "${PLATFORM}" == "Darwin" ]; then
	ARCH="mac32"
elif [ "${ARCH}" == "i686" ]; then
	ARCH="linux32"
else
	ARCH="linux64"
fi

TEMP_DIR=`mktemp -d -t tmp.XXXXXX`
trap "rm -rf ${TEMP_DIR}" EXIT
ARCHIVE="${TEMP_DIR}/chrome-driver.zip"

DRIVER_NAME=`echo ${DRIVER_NAME} | sed "s/{{arch}}/${ARCH}/"`
echo "Downloading '${DRIVER_NAME}' version '${DRIVER_VERSION}'"
curl -sS "${DRIVER_URL}/${DRIVER_VERSION}/${DRIVER_NAME}" > "${ARCHIVE}"

echo "Unpacking Chrome driver"
mkdir -p "${BIN_DIR}"
pushd "${BIN_DIR}" > /dev/null
unzip "${ARCHIVE}"
popd > /dev/null