#!/bin/bash

# Copyright 2018 Amazon.com, Inc. or its affiliates. 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. A copy of the License is
# located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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 -euxo pipefail

# Some of our dependencies take a long time to build; this script
# caches the binaries resulting from such builds until the upstream
# git revision changes.

# Note that we're not using codebuild's native caching support as it's
# not compatible with the barebones ubuntu docker image we're using
# (which in turn we're using because we need recent openssl).

GIT_URL="$1"
shift

GIT_TAG=HEAD

if [ "x${1:-}" == "x--git-tag" ]; then
    shift
    GIT_TAG=$1
    shift
fi

BASENAME="$(basename "$GIT_URL" .git)"
ROOT="/deps/$BASENAME"

mkdir -p "$ROOT"
git clone "$GIT_URL" "$ROOT/git"
(cd $ROOT/git; git reset --hard $GIT_TAG)

# Find the actual commit hash that we checked out
GITREV="$(cd "$ROOT/git"; git rev-parse HEAD)"
ID_HASH="$(echo "$GITREV $@" | sha512sum | sed 's/ .*//')"
S3PATH=s3://awsct-csdk-buildcache/$BASENAME/$ID_HASH.tar.xz

if aws s3 cp $S3PATH "$ROOT/prebuilt.tar.xz"; then
    tar -C "$ROOT" -xvf "$ROOT/prebuilt.tar.xz"
else
    mkdir -p "$ROOT/build"
    (cd $ROOT/build; cmake "$ROOT/git" -GNinja "$@" -DCMAKE_INSTALL_PREFIX="$ROOT/install" && cmake --build . && cmake --build . --target install)
    tar -C "$ROOT" -cJvf prebuilt.tar.xz install
    aws s3 cp prebuilt.tar.xz "$S3PATH"
fi