#!/bin/bash
# Copyright 2022 Northern.tech AS
#
#    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.

# Exit if any command exits with a non-zero exit status.
set -o errexit

server_ip=""
output_dir=""
while (("$#")); do
    case "$1" in
        -o | --output-dir)
            output_dir="${2}"
            shift 2
            ;;
        -s | --server-ip)
            server_ip="${2}"
            shift 2
            ;;
        *)
            echo "Sorry but the provided option is not supported: $1"
            echo "Usage:  $(basename $0) --output-dir <rootfs overlay dir> --server-ip <your server IP address>"
            exit 1
            ;;
    esac
done

if [ -z "${output_dir}" ]; then
    echo "Sorry, but you need to provide an output directory using the '-o/--output-dir' option"
    exit 1
fi
if [ -z "${server_ip}" ]; then
    echo "Sorry, but you need to provide a server IP address using the '-s/--server-ip' option"
    exit 1
fi

if [ -e ${output_dir} ]; then
     sudo chown -R $(id -u) ${output_dir}
     sudo chgrp -R $(id -g) ${output_dir}
fi

mkdir -p ${output_dir}/etc/mender
cat <<- EOF > ${output_dir}/etc/mender/mender.conf
{
  "ServerURL": "https://docker.mender.io",
  "ServerCertificate": "/etc/mender/server.crt"
}
EOF

cat <<- EOF > ${output_dir}/etc/hosts
127.0.0.1	localhost

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

${server_ip} docker.mender.io s3.docker.mender.io
EOF
wget -q "https://raw.githubusercontent.com/mendersoftware/mender/master/support/demo.crt" -O ${output_dir}/etc/mender/server.crt

sudo chown -R 0 ${output_dir}
sudo chgrp -R 0 ${output_dir}

echo "Configuration file for using Demo Mender Server written to: ${output_dir}/etc/mender/mender.conf"