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Dir : ~/lib/dracut/modules.d/95lunmask/

Edit File: parse-lunmask.sh

#!/usr/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

[ -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=","
        # shellcheck disable=SC2086
        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