third_party/bazel-toolchain/utils/llvm_checksums.sh

#!/bin/bash

set -euo pipefail

use_github_host=0

while getopts "v:gh" opt; do
  case "$opt" in
    "v") llvm_version="$OPTARG";;
    "g") use_github_host=1;;
    "h") echo "Usage:"
       echo "-v - Version of clang+llvm to use"
       echo "-g - Use github to download releases"
       exit 2
       ;;
    "?") echo "invalid option: -$OPTARG"; exit 1;;
  esac
done

if ! [[ "${llvm_version:-}" ]]; then
  echo "Usage: ${BASH_SOURCE[0]} -v llvm_version"
  exit 1
fi

tmp_dir="$(mktemp -d)"

cleanup() {
  rc=$?
  rm -rf "${tmp_dir}"
  exit $rc
}
trap 'cleanup' INT HUP QUIT TERM EXIT

llvm_host() {
  local url_base="releases.llvm.org/${llvm_version}"
  output_dir="${tmp_dir}/${url_base}"
  wget --compression gzip --recursive --level 1 --directory-prefix="${tmp_dir}" \
    --accept-regex "clang%2bllvm.*tar.xz$" "http://${url_base}/"
}

github_host() {
  output_dir="${tmp_dir}"
  (
  cd "${output_dir}"
  curl -s "https://api.github.com/repos/llvm/llvm-project/releases/tags/llvmorg-${llvm_version}" | \
    jq .assets[].browser_download_url | \
    tee ./urls.txt | \
    grep 'clang%2Bllvm.*tar.xz"$' | \
    tee ./filtered_urls.txt | \
    xargs -n1 curl -L -O
  )
}

if (( use_github_host )); then
  github_host
else
  llvm_host
fi

echo ""
echo "===="
echo "Checksums for clang+llvm distributions are:"
find "${output_dir}" -type f -name '*.xz' -exec shasum -a 256 {} \; | \
  sed -e "s@${output_dir}/@@" | \
  awk '{ printf "\"%s\": \"%s\",\n", $2, $1 }'