#! /bin/sh
#
# dasd_configure
#
# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
#
# Configures a DASD device by calling the IBM-provided chzdev command.
# Whereas this script used to validate the parameters provided to it,
# we now rely on chzdev to do that instead. The script is intended only
# as a "translation layer" to provide backward compatability for older
# scripts and tools that invoke it.
#
# Usage:
#   dasd_configure [-f -t <dasd_type> ] <ccwid> <online> [use_diag]
#
#	-f Override safety checks
#	-t DASD type. Must be provided if -f is used. Only dasd-eckd and
#                     dasd-fba are supported - Deprecated
#	ccwid = x.y.ssss where
#		x is always 0 until IBM creates something that uses that number
#		y is the subchannel set ID (SSID). Most often
#                 this is 0, but it could be non-zero
#		ssss is the four digit device address of the subchannel, in
#                    hexidecimal, with leading zeros.
#	online = 0 to take the device offline
#		 1 to bring the device online
#	use_diag = 0 to _not_ use z/VM DIAG250 I/O, which is the default
#		   1 to use z/VM DIAG250 I/O
#
# Return values:
#   Return codes are determined by the chzdev command, with one exception: If a
#   DASD volume is not formatted, we will issue a return code of 8.
#

mesg () {
    echo "$@"
}

debug_mesg () {
    case "${DEBUG}" in
	yes) mesg "$@" ;;
	*) ;;
    esac
}

add_cio_channel() {
	echo "$* # ${DATE}" >> /boot/zipl/active_devices.txt
}

remove_cio_channel() {
	[ -w /boot/zipl/active_devices.txt ] && sed -i -e "/^${1}/d" /boot/zipl/active_devices.txt
}

usage(){
  echo "Usage: ${0} [-f -t <dasd_type> ] <ccwid> <online> [use_diag]"
  echo
  echo "	-f Override safety checks"
  echo "	-t DASD type. Must be provided if -f is used. Only dasd-eckd and"
  echo "                      dasd-fba are supported - Deprecated"
  echo "	ccwid = x.y.ssss where"
  echo "		x is always 0 until IBM creates something that uses that number"
  echo "		y is the subchannel set ID (SSID). Most often"
  echo "                  this is 0, but it could be non-zero"
  echo "		ssss is the four digit device address of the subchannel, in"
  echo "                     hexidecimal, with leading zeros."
  echo "	online = 0 to take the device offline"
  echo "		 1 to bring the device online"
  echo "	use_diag = 0 to _not_ use z/VM DIAG250 I/O, which is the default"
  echo "		   1 to use z/VM DIAG250 I/O"
}

if [ "${DEBUG}" != "yes" ]; then
  DEBUG="no"
fi

DATE=$(date)

DASD_FORCE=0

############################################################
# Parse the parameters from the command line
#
ARGS=$(getopt --options ft: -n "dasd_configure" -- "$@")
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

eval set -- "${ARGS}"
debug_mesg "All the parms passed were ${ARGS}"

while true; do
	case "${1}" in
		-f) debug_mesg "This used to mean udev rules will always be generated."
                    debug_mesg "For chzdev, it means safety checks will be overridden."
                    debug_mesg "Kinda sorta the same thing, really."
                    PARM_LIST="${PARM_LIST} -f"
		    DASD_FORCE=1
                    shift 1
                    ;;
		-t) debug_mesg "This used to set the card type to ${2}"
                    debug_mesg "Now it gets ignored."
                    shift 2
                    ;;
		--) debug_mesg "Found the end of parms indicator: --"
                    shift 1
                    break
                    ;;
                *)  debug_mesg "At the catch-all select entry"
                    debug_mesg "What was selected was ${1}"
                    shift 1
                    ;;
        esac
done

CCW_CHAN_ID=${1}
ON_OFF=${2}
USE_DIAG=${3}

if [ -z "${CCW_CHAN_ID}" ] || [ -z "${ON_OFF}" ]; then
  mesg "You didn't specify all the needed parameters."
  usage
  exit 1
fi

if [ -n "${USE_DIAG}" ]; then
  PARM_LIST="${PARM_LIST} use_diag=${USE_DIAG}"
else PARM_LIST="${PARM_LIST} use_diag=0"
fi

if [ "${ON_OFF}" == 0 ]; then
  debug_mesg "chzdev -d dasd --no-root-update ${CCW_CHAN_ID}"
  chzdev -d dasd --no-root-update ${CCW_CHAN_ID}
elif [ "${ON_OFF}" == 1 ]; then
  debug_mesg "chzdev -e dasd --no-root-update ${CCW_CHAN_ID} ${PARM_LIST}"
  chzdev -e dasd --no-root-update ${CCW_CHAN_ID} ${PARM_LIST}
else mesg "You must specify a 0 or a 1 for the online/offline attribute."
     usage
     exit 1
fi

RC=${?}
if [ ${RC} -ne 0 ]; then
  exit ${RC}
elif [ ${ON_OFF} == 1 ]; then
    exitcode=0
    # Extract the full busid so that we can reference the proper entries in /sys
    BUSID=$(/usr/sbin/lszdev dasd ${CCW_CHAN_ID} | /usr/bin/sed -e 1d | /usr/bin/tr -s " " | /usr/bin/cut -f2 -d" " )
    # Make sure the DASD volume came online
    for ((counter=0; counter<30; counter++)); do
      sleep 0.1
      read online < /sys/bus/ccw/devices/${BUSID}/online
      if [ ${online} -eq 1 ] ; then
        break
      fi
    done

    if [ ${online} -ne 1 ]; then
      debug_mesg "DASD ${CCW_CHAN_ID} did not come online."
      exit 17
    fi

    # Check to see if the DASD volume is unformatted. If so, let YaST know.
    read status < /sys/bus/ccw/devices/${BUSID}/status
    if [ "${status}" == "unformatted" ]; then
      mesg "DASD ${CCW_CHAN_ID} is unformatted."
      exitcode=8
    fi
fi

if [ ${ON_OFF} == 1 ]; then
  add_cio_channel "${CCW_CHAN_ID}"
else remove_cio_channel "${CCW_CHAN_ID}"
fi

exit ${exitcode}