lets you install archived versions of rustup for any supported target

install-rustup

#!/usr/bin/env zsh

if [[ $1 =~ "-help|-h" ]]; then
  echo
  echo "usage: ./install-rustup [version] [target]"
  echo

  exit
fi

if [[ -f rustup-init ]]; then
  echo

./rustup-init --version || { echo "problem" }

  echo
  echo "setup file already exists, remove it first if you want another version"
  echo

  exit 1
fi

local version=${1:-'1.27.1'}
local target=${2:-'aarch64-apple-darwin'}

echo
echo "downloading rustup v${version} for target: ${target}"
echo

curl --proto '=https' --tlsv1.2 -sSf https://static.rust-lang.org/rustup/archive/$version/$target/rustup-init > rustup-init

chmod 744 rustup-init

local check_version=$(./rustup-init --version) || { echo "problem with rustup-init v${version}"; exit 1; }

if [[ ! $check_version =~ "$version" ]]; then
  echo "requested $version does not match downloaded version; $check_version"
  echo

  exit 1
fi

echo "installing rustup v${version} for target: ${target}"
echo

read -q "choice?Continue (y/N) ? "

case "$choice" in 
  y|Y ) ;;
  n|N ) exit;;
esac

./rustup-init || { echo "problem installing rustup v${version}"; exit 1; }

rm rustup-init