#!/bin/bash
#
# Copyright 2015 The Bazel Authors. 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.

set -euo pipefail

# This script bootstraps building a Bazel binary without Bazel then
# use this compiled Bazel to bootstrap Bazel itself. It can also
# be provided with a previous version of Bazel to bootstrap Bazel
# itself.

WORKDIR=$(pwd)
OUT=$1
EMBEDDED_TOOLS=$2
DEPLOY_JAR=$3
INSTALL_BASE_KEY=$4
shift 4

TMP_DIR=${TMPDIR:-/tmp}
PACKAGE_DIR="$(mktemp -d ${TMP_DIR%%/}/bazel.XXXXXXXX)"
mkdir -p "${PACKAGE_DIR}"
trap "rm -fr ${PACKAGE_DIR}" EXIT

cp $* ${PACKAGE_DIR}

# Unpack the deploy jar for postprocessing and for "re-compressing" to save
# ~10% of final binary size.
unzip -q -d recompress ${DEPLOY_JAR}
cd recompress

# Zero out timestamps and sort the entries to ensure determinism.
find . -type f -print0 | xargs -0 touch -t 198001010000.00
find . -type f | sort | zip -q0DX@ ../deploy-uncompressed.jar

# While we're in the deploy jar, grab the label and pack it into the final
# packaged distribution zip where it can be used to quickly determine version
# info.
bazel_label="$(\
  (grep '^build.label=' build-data.properties | cut -d'=' -f2- | tr -d '\n') \
      || echo -n 'no_version')"
echo -n "${bazel_label:-no_version}" > "${PACKAGE_DIR}/build-label.txt"

cd ..

# The server jar needs to be the first binary we extract. This is how the Bazel
# client knows what .jar to pass to the JVM.
cp deploy-uncompressed.jar ${PACKAGE_DIR}/A-server.jar
cp ${INSTALL_BASE_KEY} ${PACKAGE_DIR}/install_base_key
# The timestamp of embedded tools should already be zeroed out in the input zip
touch -t 198001010000.00 ${PACKAGE_DIR}/*

if [ -n "${EMBEDDED_TOOLS}" ]; then
  mkdir ${PACKAGE_DIR}/embedded_tools
  (cd ${PACKAGE_DIR}/embedded_tools && unzip -q "${WORKDIR}/${EMBEDDED_TOOLS}")
fi

(cd ${PACKAGE_DIR} && find . -type f | sort | zip -q9DX@ "${WORKDIR}/${OUT}")