#!/usr/bin/env bash

set -e

GOLANG_VERSION=1.17

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="6bf89fc4f5ad763871cf7eac80a2d594492de7a818303283f1366a7f6a30372d *go.tgz"
    elif [[ $1 == "arm64" ]]; then
        URL="https://golang.org/dl/go${GOLANG_VERSION}.linux-$1.tar.gz"
        CHECKSUM="01a9af009ada22122d3fcb9816049c1d21842524b38ef5d5a0e2ee4b26d7c3e7 *go.tgz"
    elif [[ $1 == "arm" ]]; then
        URL="https://golang.org/dl/go${GOLANG_VERSION}.linux-armv6l.tar.gz"
        CHECKSUM="ae89d33f4e4acc222bdb04331933d5ece4ae71039812f6ccd7493cb3e8ddfb4e *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