#!/bin/sh

command -v getarg >/dev/null || . /lib/dracut-lib.sh
command -v getargbool >/dev/null || {
    # Compatibility with older Dracut versions.
    # With apologies to the Dracut developers.
    getargbool() {
        local _b
        unset _b
        local _default
        _default="$1"; shift
        _b=$(getarg "$@")
        [ $? -ne 0 -a -z "$_b" ] && _b="$_default"
        if [ -n "$_b" ]; then
            [ $_b = "0" ] && return 1
            [ $_b = "no" ] && return 1
            [ $_b = "off" ] && return 1
        fi
        return 0
    }
}

OLDIFS="${IFS}"
NEWLINE="
"

ZPOOL_IMPORT_OPTS=""
if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
	warn "ZFS: Will force-import pools if necessary."
	ZPOOL_IMPORT_OPTS="${ZPOOL_IMPORT_OPTS} -f"
fi

# find_bootfs
#   returns the first dataset with the bootfs attribute.
find_bootfs() {
	IFS="${NEWLINE}"
	for dataset in $(zpool list -H -o bootfs); do
		case "${dataset}" in
			"" | "-")
				continue
				;;
			"no pools available")
				IFS="${OLDIFS}"
				return 1
				;;
			*)
				IFS="${OLDIFS}"
				echo "${dataset}"
				return 0
				;;
		esac
	done

	IFS="${OLDIFS}"
	return 1
}

# import_pool POOL
#   imports the given zfs pool if it isn't imported already.
import_pool() {
	local pool="${1}"

	if ! zpool list -H "${pool}" 2>&1 > /dev/null ; then
		info "ZFS: Importing pool ${pool}..."
		if ! zpool import -N ${ZPOOL_IMPORT_OPTS} "${pool}" ; then
			warn "ZFS: Unable to import pool ${pool}"
			return 1
		fi
	fi

	return 0
}

# mount_dataset DATASET
#   mounts the given zfs dataset.
mount_dataset() {
	local dataset="${1}"
	local mountpoint="$(zfs get -H -o value mountpoint "${dataset}")"

	# We need zfsutil for non-legacy mounts and not for legacy mounts.
	if [ "${mountpoint}" = "legacy" ] ; then
		mount -t zfs "${dataset}" "${NEWROOT}"
	else
		mount -o zfsutil -t zfs "${dataset}" "${NEWROOT}"
	fi

	return $?
}

# export_all OPTS
#   exports all imported zfs pools.
export_all() {
	local opts="${@}"
	local ret=0

	IFS="${NEWLINE}"
	for pool in `zpool list -H -o name` ; do
		if zpool list -H "${pool}" 2>&1 > /dev/null ; then
			zpool export "${pool}" ${opts} || ret=$?
		fi
	done
	IFS="${OLDIFS}"

	return ${ret}
}