#!/usr/bin/env bash

#   Copyright The containerd Authors.

#   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.

#
# Builds and installs runc to /usr/local/go/bin based off
# the commit defined in go.mod
#
set -eu -o pipefail

function install_runc() {
	script_dir="$(cd -- "$(dirname -- "$0")" > /dev/null 2>&1; pwd -P)"

	# When updating runc-version, consider updating the runc module in go.mod as well
	: "${RUNC_VERSION:=$(cat "${script_dir}/runc-version")}"

	TMPROOT=$(mktemp -d)
	git clone https://github.com/opencontainers/runc.git "${TMPROOT}"/runc
	pushd "${TMPROOT}"/runc
	git checkout "${RUNC_VERSION}"
	make BUILDTAGS='seccomp' runc
	make install
	popd
	rm -fR "${TMPROOT}"
}

function install_crun() {
	CRUN_VERSION=0.19
	curl -o /usr/local/sbin/runc -L https://github.com/containers/crun/releases/download/"${CRUN_VERSION}"/crun-"${CRUN_VERSION}"-linux-"$(go env GOARCH)"
	chmod +x /usr/local/sbin/runc
}

: "${RUNC_FLAVOR:=runc}"
case ${RUNC_FLAVOR} in
runc) install_runc ;;
crun) install_crun ;;
*)
	echo >&2 "unknown runc flavor: ${RUNC_FLAVOR}"
	exit 1
	;;
esac