#!/bin/bash -e
# Copyright 2015 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

readonly GCS_BUCKET="gs://kythe-builds"

proc usage {
  echo "usage: $[basename $0] cache-dir" > !2
}

if [[ $# != 1 ]] {
  usage
  exit 1
}

setglobal CACHE = $[readlink -m $1]
echo "Cache Root:      $CACHE"

setglobal REPO = $[readlink -e "$[dirname $0]/..]
echo "Repository Root: $REPO"

source tools/modules/versions.sh
setglobal NAME = ""llvm-$(FULL_SHA)""
setglobal LLVM = ""$CACHE/$NAME""

if [[ ! -d "$LLVM" ]] {
  setglobal TMP = $[mktemp -d]
  trap "rm -rf '$TMP'" EXIT ERR INT
  cd $TMP
  gsutil cp "$(GCS_BUCKET)/$NAME.tar.gz" .
  tar xzf "$NAME.tar.gz"
  mkdir -p $[dirname $LLVM]
  mv llvm $LLVM
} else {
  echo "Reusing cached LLVM version at $LLVM"
}

rm -rf "$REPO"/third_party/llvm/llvm
cp -r $LLVM "$REPO"/third_party/llvm/llvm