install-go

#!/bin/bash
set -euo pipefail
IFS=$'\n\t'

source "${0%/*}/lib/args.sh"
source "${0%/*}/lib/log.sh"

if args::help "$@"; then
  args::usage "$0" '[-v <version>] [-o <os-arch>] [-d <install-dir>]'
fi

version='latest'
os_arch='linux-amd64'
install_dir='/usr/local/go'

while getopts ':v:o:d:' opt; do
  case ${opt} in
    v) version=${OPTARG} ;;
    o) os_arch=${OPTARG} ;;
    d) install_dir=${OPTARG} ;;
    *)
      log::e "invalid option: ${OPTARG}"
      exit 1
      ;;
  esac
done

if [[ ${version} == 'latest' ]]; then
  latest_version=$(curl -sS 'https://go.dev/VERSION?m=text')
  readonly latest_version
  log::i "latest version: ${latest_version}"
  version=${latest_version/go/}
fi

readonly version
readonly os_arch
readonly install_dir

readonly archive_filename="go${version}.${os_arch}.tar.gz"
readonly download_location="/tmp/${archive_filename}"

log::i 'downloading...'
curl "https://go.dev/dl/${archive_filename}" -o "${download_location}" -L --progress-bar

current_version=$("${install_dir}/bin/go" version 2> /dev/null || echo 'null')
readonly current_version

if [[ ${current_version} != 'null' ]]; then
  log::i 'removing previous installation...'
  ( set -x; sudo rm -rI "${install_dir}" )
fi

log::i 'installing...'
sudo tar -C "$(dirname "${install_dir}")" -xzf "${download_location}"

installed_version=$(go version)
readonly installed_version
log::i "installed: ${installed_version}"

rm "${download_location}"