temperature-warning.sh

#!/bin/sh
# Made by Jack'lul <jacklul.github.io>
#
# Send warning to syslog when temperatures reaches specific threshold
#

#jas-update=temperature-warning.sh
#shellcheck shell=ash
#shellcheck disable=SC2155

#shellcheck source=./common.sh
readonly common_script="$(dirname "$0")/common.sh"
if [ -f "$common_script" ]; then . "$common_script"; else { echo "$common_script not found" >&2; exit 1; } fi

TRIGGER_TEMPERATURE=80 # target temperature at which log the warning
WARNING_COOLDOWN=300 # how long to wait (seconds) before logging another warning
EXECUTE_COMMAND="" # execute a command each time warning is issued (receives arguments: $1 = sensors - "cpu 2.4g 5g 6g")

load_script_config

state_file="$TMP_DIR/$script_name"

validate_config() {
    [ -z "$TRIGGER_TEMPERATURE" ] && { logecho "Error: TRIGGER_TEMPERATURE is not set" error; exit 1; }
    [ -z "$WARNING_COOLDOWN" ] && { logecho "Error: WARNING_COOLDOWN is not set" error; exit 1; }
}

get_temperatures() {
    local _eth_24g=""
    local _eth_5g=""
    local _eth_6g=""

    local _interface _status

    for _interface in /sys/class/net/eth*; do
        [ ! -d "$_interface" ] && continue

        _interface="$(basename "$_interface")"
        _status="$(wl -i "$_interface" status 2> /dev/null)"

        if echo "$_status" | grep -Fq "2.4GHz"; then
            _eth_24g="$_interface"
        elif echo "$_status" | grep -Fq "5GHz"; then
            _eth_5g="$_interface"
        elif echo "$_status" | grep -Fq "6GHz"; then
            _eth_6g="$_interface"
        fi

        [ -n "$_eth_24g" ] && [ -n "$_eth_5g" ] && break
    done

    [ -f /sys/class/thermal/thermal_zone0/temp ] && cpu_temperature="$(awk '{print $1 / 1000}' < /sys/class/thermal/thermal_zone0/temp)"
    [ -n "$_eth_24g" ] && wifi_24g_temperature="$(wl -i "$_eth_24g" phy_tempsense | awk '{print $1 / 2 + 20}')"
    [ -n "$_eth_5g" ] && wifi_5g_temperature="$(wl -i "$_eth_5g" phy_tempsense | awk '{print $1 / 2 + 20}')"
    [ -n "$_eth_6g" ] && wifi_6g_temperature="$(wl -i "$_eth_6g" phy_tempsense | awk '{print $1 / 2 + 20}')"
}

case "$1" in
    "run")
        validate_config

        uptime="$(awk -F '.' '{print $1}' /proc/uptime)"
        uptime_cached="$([ -f "$state_file" ] && cat "$state_file" || echo "0")"

        if [ -z "$uptime_cached" ] || [ "$((uptime_cached+WARNING_COOLDOWN))" -le "$uptime" ]; then
            get_temperatures

            if [ "$(printf "%.0f" "$cpu_temperature")" -ge "$TRIGGER_TEMPERATURE" ]; then
                logecho "CPU temperature warning: $cpu_temperature C" alert
                warning="cpu"
            fi

            if [ -n "$wifi_24g_temperature" ] && [ "$(printf "%.0f\n" "$wifi_24g_temperature")" -ge "$TRIGGER_TEMPERATURE" ]; then
                logecho "WiFi 2.4G temperature warning: $wifi_24g_temperature C" alert
                warning="$warning 2.4g"
            fi

            if [ -n "$wifi_5g_temperature" ] && [ "$(printf "%.0f\n" "$wifi_5g_temperature")" -ge "$TRIGGER_TEMPERATURE" ]; then
                logecho "WiFi 5G temperature warning: $wifi_5g_temperature C" alert
                warning="$warning 5g"
            fi

            if [ -n "$wifi_6g_temperature" ] && [ "$(printf "%.0f\n" "$wifi_6g_temperature")" -ge "$TRIGGER_TEMPERATURE" ]; then
                logecho "WiFi 6G temperature warning: $wifi_6g_temperature C" alert
                warning="$warning 6g"
            fi

            if [ -n "$warning" ]; then
                echo "$uptime" > "$state_file"

                [ -n "$EXECUTE_COMMAND" ] && eval "$EXECUTE_COMMAND $(echo "$warning" | awk '{$1=$1};1')"
            fi
        fi
    ;;
    "check")
        get_temperatures

        [ -n "$cpu_temperature" ] && echo "CPU temperature: $cpu_temperature C"
        [ -n "$wifi_24g_temperature" ] && echo "WiFi 2.4G temperature: $wifi_24g_temperature C ($_eth_24g)"
        [ -n "$wifi_5g_temperature" ] && echo "WiFi 5G temperature: $wifi_5g_temperature C ($_eth_5g)"
        [ -n "$wifi_6g_temperature" ] && echo "WiFi 6G temperature: $wifi_6g_temperature C ($_eth_5g)"
    ;;
    "start")
        validate_config
        crontab_entry add "*/1 * * * * $script_path run"
    ;;
    "stop")
        crontab_entry delete
    ;;
    "restart")
        sh "$script_path" stop
        sh "$script_path" start
    ;;
    *)
        echo "Usage: $0 run|start|stop|restart|check"
        exit 1
    ;;
esac