#!/usr/bin/ksh
# Copyright (C) 2019 Checkmk GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

# Reason for this no-op: shellcheck disable=... before the first command disables the error for the
# entire script.
:

# Disable unused variable error (needed to keep track of version)
# shellcheck disable=SC2034
CMK_VERSION="2.3.0p38"

# Monitor status of LUNs on HP-UX
# Put this file into /usr/lib/check_mk_agent/plugins. Then
# reinventorize your host.
# Actually querying these stats is quite slow since they freshly update
# on each call. If you have a few 1000 luns then this will not work.

get_stats() {
    scsimgr get_stat -D "$LUN" | tr '\=' ':' | grep -e 'STATISTICS FOR LUN' -e 'Bytes' -e 'Total I/Os processed' -e 'I/O failure' -e 'IO failures due
to'
    return $?
}

# Ex:
#LUN PATH INFORMATION FOR LUN : /dev/pt/pt2
#World Wide Identifier(WWID) =
#LUN PATH INFORMATION FOR LUN : /dev/rdisk/disk5
#World Wide Identifier(WWID) = 0x60a98000572d44745634645076556357
#LUN PATH INFORMATION FOR LUN : /dev/rdisk/disk6

get_lun_map() {
    scsimgr lun_map | grep -E '^[[:space:]]*(LUN PATH|World Wide Identifier)' | tr '\=' ':'
}

main() {
    # SC2162: read without -r will mangle backslashes.
    # We suppress it here for compatibility (curretly backslashes e.g. before spaces are dropped).
    # Since escaping of field seperators is not relevant when reading into one variable, we probably
    # would have wanted "read -r".
    # shellcheck disable=SC2162
    get_lun_map | while read line; do
        descr=$(echo "$line" | awk -F: '{print $1}')
        val=$(echo "$line" | awk -F: '{print $2}')
        case $descr in
            LUN*)
                if echo "$val" | grep /dev/rdisk 1>/dev/null; then
                    DMP=yes
                    LUN=$val
                else
                    DMP=no
                    unset LUN
                fi
                ;;
            World*)
                if [ "$DMP" = "yes" ]; then
                    echo "WWID: $val"
                    get_stats "$LUN"
                fi
                ;;
            *)
                echo "Fehler:"
                echo "$line"
                echo "$descr"
                echo "$val"
                sleep 1
                ;;
        esac
    done
}

# Verify the system is using new multipath device model.
if [ -d /dev/rdisk ] && [ -d /dev/disk ]; then
    echo '<<<hpux_lunstats:sep(58)>>>'
    main
fi