set -euo pipefail

GO_VERSION="1.9.1"

export GoInstallDir="/tmp/go$GO_VERSION"

mkdir -p $GoInstallDir

if [ ! -f $GoInstallDir/go/bin/go ]; then

GO_MD5="0571886e9b9ba07773b542a11e9859a4"

URL=https://buildpacks.cloudfoundry.org/dependencies/go/go${GO_VERSION}.linux-amd64-${GO_MD5:0:8}.tar.gz

echo "-----> Download go ${GO_VERSION}"

curl -s -L --retry 15 --retry-delay 2 $URL -o /tmp/go.tar.gz

DOWNLOAD_MD5=$(md5sum /tmp/go.tar.gz | cut -d ' ' -f 1)

if [[ $DOWNLOAD_MD5 != $GO_MD5 ]]; then

echo " **ERROR** MD5 mismatch: got $DOWNLOAD_MD5 expected $GO_MD5"

exit 1

fi

tar xzf /tmp/go.tar.gz -C $GoInstallDir

rm /tmp/go.tar.gz

if [ ! -f $GoInstallDir/go/bin/go ]; then

echo " **ERROR** Could not download go"

exit 1