Mini Shell

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

create_udev_rule() {
    local transport=$1
    local tgtid=$2
    local lun=$3
    local _rule=/etc/udev/rules.d/51-${transport}-lunmask-${tgtid}.rules
    local _cu_type _dev_type

    [ -e ${_rule} ] && return 0

    if [ ! -f "$_rule" ] ; then
        if [ "$transport" = "fc" ] ; then
            cat > $_rule <<EOF
ACTION=="add", SUBSYSTEM=="fc_remote_ports", ATTR{port_name}=="$tgtid", PROGRAM="fc_transport_scan_lun.sh $lun"
EOF
        elif [ "$transport" = "sas" ] ; then
            cat > $_rule <<EOF
ACTION=="add", SUBSYSTEM=="sas_device", ATTR{sas_address}=="$tgtid", PROGRAM="sas_transport_scan_lun.sh $lun"
EOF
        fi
    fi
}

for lunmask_arg in $(getargs rd.lunmask); do
    (
        local OLDIFS="$IFS"
        local IFS=","
        set $lunmask_arg
        IFS="$OLDIFS"
        if [ -d /sys/module/scsi_mod ] ; then
            printf "manual" > /sys/module/scsi_mod/parameters/scan
        elif [ ! -f /etc/modprobe.d/95lunmask.conf ] ; then
            echo "options scsi_mod scan=manual" > /etc/modprobe.d/95lunmask.conf
        fi
        create_udev_rule $1 $2 $3
    )
done