Safe Shutdown Script

SafeShutdown.py

#!/usr/bin/env python3
from gpiozero import Button, LED, OutputDevice
import os
from signal import pause
import subprocess
from time import sleep

resetPin = 2
ledPin = 14
powerenPin = 4
fanPin = 17
hold = 2
led = LED(ledPin,initial_value=True)
power = OutputDevice(powerenPin,initial_value=True)
fan = OutputDevice(fanPin,initial_value=False)

reboot_long_press = None

#functions that handle button events
def reboot_press():
    global reboot_long_press
    reboot_long_press = False

def reboot_hold():
    led.blink(.25,.25)
    global reboot_long_press
    reboot_long_press = True

def reboot_release():
    led.on()
    output_es = int(subprocess.check_output(['/opt/RetroFlag/multi_switch.sh', '--es-pid']))
    output_rc = int(subprocess.check_output(['/opt/RetroFlag/multi_switch.sh', '--rc-pid']))

    if reboot_long_press:
        if output_rc:
            os.system("/opt/RetroFlag/multi_switch.sh --closeemu")

        if output_es:
            os.system("/opt/RetroFlag/multi_switch.sh --es-reboot")
        else:
            os.system("sudo reboot")
    else:
        if output_rc:
            os.system("/opt/RetroFlag/multi_switch.sh --closeemu")
        elif output_es:
            os.system("/opt/RetroFlag/multi_switch.sh --es-restart")

rebootBtn = Button(resetPin,hold_time=hold)
rebootBtn.when_pressed = reboot_press
rebootBtn.when_held = reboot_hold
rebootBtn.when_released = reboot_release

def getCPUtemp():
	res = os.popen('vcgencmd measure_temp').readline()
	return float(res.replace("temp=","").replace("'C\n",""))

fanOn = False
forcedFanState = False

while True:
	reqFanState = None
	governor = None
	with open('/dev/shm/fan_governor','r') as f:
		governor = f.readline().strip().lower()

	if governor == 'alwayson':
		reqFanState = True
		forcedFanState = True
	elif governor == 'alwaysoff':
		reqFanState = False
		forcedFanState = True
	else:
		fanOnTemp = 65
		fanOffTemp = 45
		if governor == 'quiet':
			fanOnTemp = 70
			fanOffTemp = 60
		cpuTemp = int(getCPUtemp())
		if forcedFanState:
			reqFanState = False
			forcedFanState = False
		if cpuTemp >= fanOnTemp:
			reqFanState = True
		elif cpuTemp < fanOffTemp:
			reqFanState = False

	if not fanOn and reqFanState is True:
		fan.on()
		fanOn = True
	elif fanOn and reqFanState is False:
		fan.off()
		fanOn = False
	sleep(5.0)