#!/bin/bash
#
# Copyright IBM Corp. 2023
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#
# zdev-to-dasd_mod.dasd
#   Converts zdev configuration into the syntax of the kernel module parameter
#   dasd_mod.dasd. Only DASD options with non-default values are emitted. The
#   result string occurs on stdout. It represents one device-specification for
#   the given DASD device bus-ID.
#

function usage() {
    echo "usage: ${0##*/} active|persistent <DASD device bus-ID>" 1>&2
    exit 1
}

[[ $# -eq 2 ]] || usage

[[ "$1" == active ]] || [[ "$1" == persistent ]] || usage

_selection="--${1}"
_busid="$2"

while read -r _line; do
    case "$_line" in
        "readonly=1") _attrs="${_attrs:+${_attrs}:}ro" ;;
        "use_diag=1") _attrs="${_attrs:+${_attrs}:}diag" ;;
        "raw_track_access=1") _attrs="${_attrs:+${_attrs}:}raw" ;;
        "erplog=1") _attrs="${_attrs:+${_attrs}:}erplog" ;;
        "failfast=1") _attrs="${_attrs:+${_attrs}:}failfast" ;;
    esac
done < <(chzdev dasd "$_busid" "$_selection" --export - --quiet)
[[ -n "$_attrs" ]] && _attrs="($_attrs)"
printf "%s%s\n" "$_busid" "$_attrs"