#!/usr/bin/env bash

set -e

GOLANG_VERSION=1.17.2

if [[ -z $1 ]]; then
    echo "architecture required: amd64, arm64, or arm" 1>&2
    exit 1
else
    set -eux;
    if [[ $1 == "amd64" ]]; then
        URL="https://golang.org/dl/go${GOLANG_VERSION}.linux-$1.tar.gz"
        CHECKSUM="f242a9db6a0ad1846de7b6d94d507915d14062660616a61ef7c808a76e4f1676 *go.tgz"
    elif [[ $1 == "arm64" ]]; then
        URL="https://golang.org/dl/go${GOLANG_VERSION}.linux-$1.tar.gz"
        CHECKSUM="a5a43c9cdabdb9f371d56951b14290eba8ce2f9b0db48fb5fc657943984fd4fc *go.tgz"
    elif [[ $1 == "arm" ]]; then
        URL="https://golang.org/dl/go${GOLANG_VERSION}.linux-armv6l.tar.gz"
        CHECKSUM="04d16105008230a9763005be05606f7eb1c683a3dbf0fbfed4034b23889cb7f2 *go.tgz"
    else
        echo "unsupported architecture" 1>&2
        exit 1
    fi
    wget -O go.tgz $URL
    echo $CHECKSUM | sha256sum -c -
    rm -rf /usr/local/go
    tar -C /usr/local -xzf go.tgz
    rm go.tgz
    /usr/local/go/bin/go version
fi