#!/bin/bash

export GOLANG_VERSION=1.5.2
export GOLANG_DOWNLOAD_URL=https://golang.org/dl/go$GOLANG_VERSION.linux-amd64.tar.gz
export GOLANG_DOWNLOAD_SHA1=cae87ed095e8d94a81871281d35da7829bd1234e

apt-get update -qq 

apt-get install -y --no-install-recommends \
    g++ \
    gcc \
    libc6-dev \
    make \
    git-core

curl -fsSL "$GOLANG_DOWNLOAD_URL" -o golang.tar.gz \
  && echo "$GOLANG_DOWNLOAD_SHA1  golang.tar.gz" | sha1sum -c - \
  && tar -C /usr/local -xzf golang.tar.gz \
  && rm golang.tar.gz

for bin in $(ls /usr/local/go/bin/); do
  test -f /usr/bin/$bin && rm /usr/bin/$bin
  update-alternatives --install /usr/bin/$bin $bin /usr/local/go/bin/$bin 1
  update-alternatives --set $bin /usr/local/go/bin/$bin
done