#!/bin/bash -e

# This is a script to download protoc. Rather than depending on the version on
# a developer's machine, always download a specific version.

VERSION="3.1.0"

if [ $# -ne 1 ]; then
  echo "Usage: ./get-protoc [dest]"
  exit 2
fi

# Use the go tool to determine OS.
OS=$( go env GOOS )

if [ "$OS" = "darwin" ]; then
  OS="osx"
fi

mkdir -p bin

# TODO(ericchiang): Architectures other than amd64?
ZIP="protoc-${VERSION}-${OS}-x86_64.zip"
URL="https://github.com/google/protobuf/releases/download/v${VERSION}/${ZIP}"

wget ${URL}
# Unpack the protoc binary. Later we might want to grab additional data. 
unzip -p ${ZIP} bin/protoc > $1
chmod +x $1
rm ${ZIP}