bazel

#!/bin/bash

# Executes bazelisk, downloading it if necessary.

set -e
set -o pipefail

_BZ_PATH="/tmp/bazelisk-$(realpath $0 | tr './' -)"
_BZ_VERSION="1.20.0"

function download_bazelisk() {
  local uname_os="$(uname -s)"
  local uname_cpu="$(uname -m)"

  case "$uname_os" in
    Linux*)
      local os="linux"
      ;;
    Darwin*)
      local os="darwin"
      ;;
    *)
      echo "bazelisk: unsupported os $uname_os"
      exit 128
  esac

  case "$uname_cpu" in
    arm64*)
      local cpu="arm64"
      ;;
    x86_64*)
      local cpu="amd64"
      ;;
    *)
      echo "bazelisk: unsupported cpu $uname_cpu"
      exit 128
  esac

  local url="https://github.com/bazelbuild/bazelisk/releases/download/v$_BZ_VERSION/bazelisk-$os-$cpu"
  echo "bazelisk: downloading $url to $_BZ_PATH"
  curl --proto '=https' --tlsv1.2 -sSfL -o "$_BZ_PATH" "$url"
  chmod +x "$_BZ_PATH"
}

if [[ ! -f "$_BZ_PATH" ]]; then
  download_bazelisk >&2
fi

exec "$_BZ_PATH" $@