#!/bin/bash -e
# vim: set ts=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
#
# Copyright (c) 2020 Red Hat, Inc.
# Author: Radovan Sroka <rsroka@redhat.com>
# Author: Sergio Correia <scorreia@redhat.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

. clevis-luks-common-functions

SUMMARY="Regenerate clevis binding"

if [ "${1}" = "--summary" ]; then
    echo "${SUMMARY}"
    exit 0
fi

usage_and_exit () {
    exec >&2
    echo "Usage: clevis luks regen [-q] -d DEV -s SLOT"
    echo
    echo "${SUMMARY}"
    echo
    echo "  -d DEV  The LUKS device on which to perform rebinding"
    echo
    echo "  -s SLT  The LUKS slot to use"
    echo
    echo "  -q      Do not prompt for confirmation"
    echo
    exit "${1}"
}

QOPT=
while getopts ":hqd:s:" o; do
    case "${o}" in
    d) DEV="${OPTARG}";;
    h) usage_and_exit 0;;
    s) SLT="${OPTARG}";;
    q) QOPT="-q";;
    *) usage_and_exit 1;;
    esac
done

if [ -z "${DEV}" ]; then
    echo "Did not specify a device!" >&2
    exit 1
fi

if [ -z "${SLT}" ]; then
    echo "Did not specify a slot!" >&2
    exit 1
fi

# Get pin and configuration.
if ! pin_cfg="$(clevis luks list -d "${DEV}" -s "${SLT}")" \
                || [ -z "${pin_cfg}" ]; then
    return 1
fi

pin="$(echo "${pin_cfg}" | cut -d' ' -f2)"
cfg="$(echo "${pin_cfg}" | cut -d' ' -f3 | sed -e "s/'//g")"
if [ -z "${pin}" ] || [ -z "${cfg}" ]; then
    echo "Invalid pin or configuration" >&2
    exit 1
fi

echo "Regenerating binding (device ${DEV}, slot ${SLT}):"
echo "Pin: ${pin}, Config: '${cfg}'"

if [ -z "${QOPT}" ]; then
    read -r -p "Do you want to proceed? [ynYN] " ans
    [ "${ans}" != "y" ] && [ "${ans}" != "Y" ] && exit 0
fi

if ! clevis_luks_do_bind "${DEV}" "${SLT}" "" "${pin}" "${cfg}" \
                         "-y" "overwrite"; then
    echo "Unable to regenerate binding in ${DEV}:${SLT}" >&2
    exit 1
fi
echo "Binding regenerated successfully" >&2