#!/bin/sh

# Copyright 2016 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 -eu

# Combine the archives passed to a single archive.
# NOTE: This assumes that the individual archives are already packed
# in a way to contain canonical timestamps. This assumption must be
# met in order to obtain reproducible output; the assumption is met
# for the source tree and the archive of the generated java files.

setglobal OUTPUT = ""$(PWD)/$1""
shift

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

for i in [$ifsjoin(Argv)]
{
    setglobal ARCHIVE = ""$(PWD)/$i""
    match $i {
        with *.zip setglobal UNPACK = '"unzip -q'" 
        with *.tar setglobal UNPACK = '"tar xf'" 
    }
    shell {cd $(PACKAGE_DIR) && $(UNPACK) $(ARCHIVE)}
}

shell {cd $(PACKAGE_DIR) && find . -type f | sort | zip -qDX@ $(OUTPUT)}