#
# Copyright (c) 2022-2023, Jesús Daniel Colmenares Oviedo <DtxdF@disroot.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

lib_load "${LIBDIR}/random"
lib_load "${LIBDIR}/replace"

ZFS_COMPONENTS_NAME="components"
ZFS_IMAGES_NAME="images"
ZFS_JAILS_NAME="jails"
ZFS_LOGS_NAME="logs"
ZFS_NETWORK_NAME="networks"
ZFS_RELEASE_NAME="releases"

lib_zfs_mkroot()
{
	if [ "${ENABLE_ZFS}" != "0" ]; then
		local escape_datadir=`lib_escape_string "${DATADIR}"`
		local escape_dataset=`lib_escape_string "${ZPOOL}/${ZROOTFS}"`

		sh -c "zfs create -p ${ZOPTS} -o mountpoint=\"${escape_datadir}\" -- \"${escape_dataset}\""
	else
		mkdir -p "${DATADIR}"
	fi
}

lib_zfs_mkdir()
{
	local mountpoint="$1"
	local name="$2"

	if [ -z "${mountpoint}" -o -z "${name}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_mkdir mountpoint name"
	fi

	if [ "${ENABLE_ZFS}" != "0" ]; then
		local escape_mountpoint=`lib_escape_string "${mountpoint}"`
		local escape_dataset=`lib_escape_string "${ZPOOL}/${ZROOTFS}/${name}"`

		sh -c "zfs create -p ${ZOPTS} -o mountpoint=\"${escape_mountpoint}\" -- \"${escape_dataset}\""
	else
		mkdir -p "${mountpoint}"
	fi
}

lib_zfs_rrmfs()
{
	local _o
	local opt_force=0 fflag=
	local opt_all_dependents=0 Rflag=

	if [ $# -eq 0 ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_rrmfs [-fR] name"
	fi

	while getopts ":fR" _o; do
		case "${_o}" in
			f)
				opt_force=1
				;;
			R)
				opt_all_dependents=1
				;;
			*)
				lib_zfs_rrmfs # usage
				;;
		esac
	done
	shift $((OPTIND-1))

	local name="$1"
	if [ -z "${name}" ]; then
		lib_zfs_rrmfs # usage
	fi

	if [ ${opt_force} -eq 1 ]; then
		fflag="-f"
	fi

	if [ ${opt_all_dependents} -eq 1 ]; then
		Rflag="-R"
	fi

	zfs destroy ${fflag} ${Rflag} -r -- "${ZPOOL}/${ZROOTFS}/${name}"
}

lib_zfs_listsnapshots()
{
	local name="$1"

	if [ -z "${name}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_listsnapshots name"
	fi

	zfs list -H -t snapshot -o name -- "${ZPOOL}/${ZROOTFS}/${name}"
}

lib_zfs_listfs()
{
	local name="$1"

	if [ -z "${name}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_listfs name"
	fi

	zfs list -H -t filesystem -r -o name -- "${ZPOOL}/${ZROOTFS}/${name}"
}

lib_zfs_snapshot()
{
	local name="$1"
	local snapname="$2"

	if [ -z "${name}" -o -z "${snapname}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_snapshot name snapname"
	fi

	zfs snapshot -- "${ZPOOL}/${ZROOTFS}/${name}@${snapname}"
}

lib_zfs_clone()
{
	local snapname="$1"
	local name="$2"

	if [ -z "${snapname}" -o -z "${name}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_clone snapname name"
	fi

	zfs clone -p -- "${ZPOOL}/${ZROOTFS}/${snapname}" "${ZPOOL}/${ZROOTFS}/${name}"
}

lib_zfs_generate_snapname()
{
	local snapname=`random_hexstring 48 0 15 | tr -d '\n'`
	snapname="appjail_copy_${snapname}"

	echo "${snapname}"
}

lib_zfs_copy()
{
	local src="$1" dst="$2" mountpoint="$3"

	if [ -z "${src}" -o -z "${dst}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_copy src dst mountpoint"
	fi

	local snapname=`lib_zfs_generate_snapname`

	local escape_snapsrc=`lib_escape_string "${ZPOOL}/${ZROOTFS}/${src}@${snapname}"`
	local escape_snapdst=`lib_escape_string "${ZPOOL}/${ZROOTFS}/${dst}@${snapname}"`

	lib_atexit_add "zfs destroy -r -- \"${escape_snapsrc}\" > /dev/null 2>&1"
	lib_atexit_add "zfs destroy -r -- \"${escape_snapdst}\" > /dev/null 2>&1"

	zfs snapshot -r -- "${ZPOOL}/${ZROOTFS}/${src}@${snapname}" || return $?
	zfs send -R -- "${ZPOOL}/${ZROOTFS}/${src}@${snapname}" | zfs recv -o mountpoint="${mountpoint}" -- "${ZPOOL}/${ZROOTFS}/${dst}" || return $?

	zfs destroy -r -- "${ZPOOL}/${ZROOTFS}/${src}@${snapname}" || return $?
	zfs destroy -r -- "${ZPOOL}/${ZROOTFS}/${dst}@${snapname}" || return $?
}

lib_zfs_in2copy()
{
	local dst="$1" mountpoint="$2"

	if [ -z "${dst}" -o -z "${mountpoint}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_in2copy dst mountpoint"
	fi

	zfs recv -o mountpoint="${mountpoint}" -- "${ZPOOL}/${ZROOTFS}/${dst}" || return $?
}

lib_zfs_copy2out()
{
	local src="$1"

	if [ -z "${src}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_copy2out src"
	fi

	local snapname=`lib_zfs_generate_snapname`

	local escape_snap=`lib_escape_string "${ZPOOL}/${ZROOTFS}/${src}@${snapname}"`

	lib_atexit_add "zfs destroy -r -- \"${escape_snap}\" > /dev/null 2>&1"

	zfs snapshot -r -- "${ZPOOL}/${ZROOTFS}/${src}@${snapname}" || return $?
	zfs send -R -- "${ZPOOL}/${ZROOTFS}/${src}@${snapname}" || return $?
}

lib_zfs_jail_rename()
{
	local old="$1" new="$2"

	if [ -z "${old}" -o -z "${new}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_rename old new"
	fi

	zfs umount "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${old}" || return $?
	zfs rename "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${old}" "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${new}" || return $?
	zfs set mountpoint="${JAILDIR}/${new}" "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${new}" || return $?
	zfs set mountpoint="${JAILDIR}/${new}/jail" "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${new}/jail" || return $?
	zfs mount "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${new}" || return $?
	zfs mount "${ZPOOL}/${ZROOTFS}/${ZFS_JAILS_NAME}/${new}/jail" || return $?
}

lib_zfs_mklogdir()
{
	local type="$1" entity="$2" subtype="$3"
	if [ -z "${type}" -o -z "${entity}" -o -z "${subtype}" ]; then
		lib_err ${EX_USAGE} "usage: lib_zfs_mklogdir type entity subtype"
	fi

	if ! lib_zfs_mkdir "${LOGDIR}" "${ZFS_LOGS_NAME}"; then
		lib_err ${EX_IOERR} "Error creating ${LOGDIR}"
	fi

	if ! lib_zfs_mkdir "${LOGDIR}/${type}" "${ZFS_LOGS_NAME}/${type}"; then
		lib_err ${EX_IOERR} "Error creating ${LOGDIR}/${type}"
	fi

	if ! lib_zfs_mkdir "${LOGDIR}/${type}/${entity}" "${ZFS_LOGS_NAME}/${type}/${entity}"; then
		lib_err ${EX_IOERR} "Error creating ${LOGDIR}/${type}/${entity}"
	fi

	if ! lib_zfs_mkdir "${LOGDIR}/${type}/${entity}/${subtype}" "${ZFS_LOGS_NAME}/${type}/${entity}/${subtype}"; then
		lib_err ${EX_IOERR} "Error creating ${LOGDIR}/${type}/${entity}/${subtype}"
	fi
}
