#!/bin/bash

if [ $# -lt 1 ]; then

echo "No installation directory was provided for build2!" 1>&2

exit 1

fi

## download phase

install_dir=$1

toolchain_file="toolchain.sha256"

if [ "$1" = "--version" ]; then

wget -q --no-verbose --no-clobber https://download.build2.org/toolchain.sha256 -O "${toolchain_file}"

else

wget --no-verbose --no-clobber https://download.build2.org/toolchain.sha256 -O "${toolchain_file}"

fi

version_line=$(grep -m 1 '' "$toolchain_file")

version_number=$(echo "$version_line" | awk '{print $2}')

### Return with version string only without actually installing build2 if "--version" flag is specified.

if [ "$1" = "--version" ]; then

echo "${version_number}"

rm -f "${toolchain_file}"

exit 0

fi

version_to_install=build2-install-${version_number}.sh

download_url=https://download.build2.org/${version_number}/${version_to_install}

wget --no-verbose --no-clobber "${download_url}" -O "${version_to_install}"

## sha256 check phase

line_with_version=$(grep "$version_to_install" "$toolchain_file")

checksum_for_version=$(echo "$line_with_version" | awk '{print $1}')

if echo "${checksum_for_version} ${version_to_install}" | sha256sum -c; then

echo "Build2 installer for version ${version_number} has been downloaded!"

else

echo "Expected checksum for build2 installer version ${version_number} doesn't match! Probably the file has been corrupted! Please install it manually!" 1>&2

echo "Expected: ${checksum_for_version}" 1>&2

rm "$version_to_install" "$toolchain_file"

exit 1

fi

## install phase

sh ${version_to_install} --yes --trust yes --jobs $(nproc) "${install_dir}"

## cleanup phase

compressed_toolchain="build2-toolchain-${version_number}.tar.xz"

rm -f "${toolchain_file}" "${version_to_install}" "${compressed_toolchain}"

echo "Build2 version ${version_number} has been successfully installed!"