#!/bin/bash
#
# Copyright 2013 Hewlett-Packard Development Company, L.P.
# 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 -eux
set -o pipefail

SCRIPT_NAME=$(basename ${0})
SCRIPT_HOME=$(dirname ${0})

function show_options () {
    echo "Usage: ${SCRIPT_NAME} [options] <path>"
    echo
    echo "Register <path> as a state path."
    echo
    echo "This will register path as being part of the state of the machine."
    echo "If there is content at <path> it will be moved to "
    echo "/var/lib/use-ephemeral/<path>."
    echo
    echo "Paths are recorded in /var/lib/use-ephemeral/stateful-paths."
    echo
    echo "Options:"
    echo "    --leave-symlink -- create a symlink from <path> to /mnt/state/<path>."
    echo
    exit ${1}
}

LEAVE_SYMLINK=""

TEMP=`getopt -o h -l help,leave-symlink -n ${SCRIPT_NAME} -- "$@"`
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

# Note the quotes around `${TEMP}': they are essential!
eval set -- "${TEMP}"

while true ; do
    case "${1}" in
        --leave-symlink) LEAVE_SYMLINK="true"; shift 1 ;;
        -h | --help) show_options 0;;
        --) shift ; break ;;
        *) echo "Error: unsupported option ${1}." ; exit 1 ;;
    esac
done

STATE_PATH=${1:-""}
EXTRA=${2:-""}

if [ -z "${STATE_PATH}" -o -n "${EXTRA}" ]; then
    show_options 1
fi

backup="/var/lib/use-ephemeral"
mkdir -p "${backup}"

echo "${STATE_PATH};${LEAVE_SYMLINK}" >> "${backup}/stateful-paths"