#!/bin/sh -e
#
# script to manage fan speeds on dell poweredge servers
# note: uses default creds of root/calvin
#
# * NOTE: *
# To resolve ipmi issue, need to change the IPMI over LAN setting from
# [Disabled] to [Enabled] in the iDRAC/iLO.
#

# default creds are root/calvin
: "${IDRAC_USER:=root}"
: "${IDRAC_PW:=calvin}"

usage() {
    >&2 printf 'Usage: %s host [-a]|[1-100]\n' "${0##*/}"
    exit 1
}

dec2hex() {
    printf '%x\n' "$1"
}

sendcommand() {
    # shellcheck disable=2086
    ipmitool \
        -I lanplus \
        -H "${IDRAC_IP:-192.168.0.94}" \
        -U "$IDRAC_USER" \
        -P "$IDRAC_PW" \
        $1
}

manual='raw 0x30 0x30 0x01 0x00'
auto='raw 0x30 0x30 0x01 0x01'

case $1 in
    -h|--help)
        usage
esac

case ${1#-} in
    m|manual)
        sendcommand "$manual"
        ;;
    a|automatic)
        sendcommand "$auto"
        ;;
    *)
        sendcommand "$manual" &&
        case $1 in
            [1-9])
                sendcommand "raw 0x30 0x30 0x02 0xff 0x0$1"
                ;;
            *)
                sendcommand "raw 0x30 0x30 0x02 0xff 0x0$(dec2hex "$1")"
        esac
esac