nixos-config/hosts/voyager/services/fancontrol.nix

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{ config, lib, pkgs, ... }:
{
systemd.timers."fancontrol" = {
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar="*:0/3";
Unit = "fancontrol.service";
};
};
systemd.services."fancontrol" = {
environment = {
TEMP_MIN_FALLING = "50";
TEMP_MAX_RISING = "56";
TEMP_CRIT = "70";
LOW_FAN_SPEED = "0x10";
};
script = ''
SET_FAN_MANUAL="0x30 0x30 0x01 0x00" # Enable manual control
SET_FAN_AUTO="0x30 0x30 0x01 0x01" # Disable manual control
SET_FAN_LOW="0x30 0x30 0x02 0xff $LOW_FAN_SPEED"
SET_FAN_MAX="0x30 0x30 0x02 0xff 0x64" # force 100%
# Get all temperatures readings starting with "Temp ", find all two digit numbers followed by spaces, find the largest one, trim the trailing space
maxcoretemp=$(${pkgs.ipmitool}/bin/ipmitool sdr type temperature | grep '^Temp ' | grep -Po '\d{2} ' | sort -nr | head -n1 | xargs)
# Verify that we read a valid number
ISNUMBER='^[0-9]+$'
if ! [[ $maxcoretemp =~ $ISNUMBER ]] ; then
echo "Error: could not read temperature" >&2
exit 2
fi
echo "Highest measured CPU temperature: '$maxcoretemp'"
if [ "$maxcoretemp" -gt "$TEMP_CRIT" ]; then
echo "TOO HOT, CRITICAL CPU TEMP"
${pkgs.ipmitool}/bin/ipmitool raw $SET_FAN_MANUAL
${pkgs.ipmitool}/bin/ipmitool raw $SET_FAN_MAX
exit 1
fi
if [ "$maxcoretemp" -gt "$TEMP_MAX_RISING" ]; then
echo "TOO HOT, switching to IDRAC fan controL"
${pkgs.ipmitool}/bin/ipmitool raw $SET_FAN_AUTO
exit 0
fi
if [ "$maxcoretemp" -lt "$TEMP_MIN_FALLING" ]; then
echo "Sufficiently cooled, stepping down fans"
${pkgs.ipmitool}/bin/ipmitool raw $SET_FAN_MANUAL
${pkgs.ipmitool}/bin/ipmitool raw $SET_FAN_LOW
exit 0
fi
echo "Temperature is between limits, doing nothing..."
'';
};
}