A super simple script to update and backport your local Go installation.

goup.sh

#!/bin/bash

function error {
    echo "❌  Error: $1"
    exit 1
}

[ "$1" == "-h" ] || [ "$1" == "--help" ] && {
    echo "Usage: $0 (version)"
    echo ""
    echo "Download and install the latest or given go version."
    echo "You need to be root to execute this script."
    exit 0
}

[ "$(id -u)" != 0 ] && {
    error "Please execute this script as root."
}

[ -z $1 ] && {
    VERSION=$(curl -s 'https://go.dev/VERSION?m=text')
} || {
    VERSION=go${1#go*}
}

case $(uname -s) in
    Darwin)  OS=darwin ;;
    Linux)   OS=linux  ;;
    Windows) error "Sorry, but currently, this script does not support Windows. 😥" ;;
    *)       error "Could not detect OS type (uname -s)."
esac

case $(uname -m) in
    i386)      ARCH=386 ;;
    x86_64)    ARCH=amd64 ;;
    arm|arm64) ARCH=arm64 ;;
    *)         error "Could not detect system architecture (uname -m)" ;;
esac

GODIR=$(which go 2> /dev/null || echo "/usr/local/go")

set -e

[ -f /tmp/goarch.tgz ] && {
    rm -f /tmp/goarch.tgz
}

echo "⏱️   Downloading $VERSION ..."
CODE=$(curl -sLo /tmp/goarch.tgz -w "%{http_code}" "https://go.dev/dl/$VERSION.$OS-$ARCH.tar.gz")

case $CODE in
    200) ;;
    404) error "Version could not be found." ;;
    *)   error "Download failed unexpectedly ($CODE)" ;;
esac

[ -d $GODIR ] && {
    echo "⏱️   Removing current installation ..."
    rm -rf $GODIR
}

echo "⏱️   Moving files ..."
tar -C /usr/local -xzf /tmp/goarch.tgz
rm -f /tmp/goarch.tgz

echo "✅  Successfully installed $VERSION!"
printf "✅  $ go version > "
$GODIR/bin/go version