go fetch and install script

update-go.sh

#!/bin/sh

if [ -z ${1} ]; then
        echo "Enter go release number"
        read VERSION
else
        VERSION=${1}
fi

ARCHIVE="go${VERSION}.linux-amd64.tar.gz"
URL="https://go.dev/dl/${ARCHIVE}"
INSTALL_HOME="${HOME}/.local"

fetch () {
        echo "Fetching archive from '${URL}'"
        curl -sSLO "${URL}"
}

extract () {
        rm -rf "${INSTALL_HOME}/go"
        tar -x -f "${ARCHIVE}" -C "${INSTALL_HOME}" -v -z
}

if [ -f "${ARCHIVE}" ]; then
        extract
else
        fetch
        extract
fi