Python Script immediately closes when ran as sudo-CodePudding

I wrote a python script, which pings a server using ping3. Since this requires root permissions in order to function, I ran the script as sudo.

Now the thing is, when I run the program without sudo, it stays open, but if ran as sudo, it immediately closes, without any exceptions.

My script:

import atexit
import RPi.GPIO as gpio
import sys
import time
from threading import Thread

import ping3
from ping3 import ping
from phue import Bridge
from datetime import datetime

ping3.EXCEPTIONS = False

functionOne = 13
functionTwo = 15
functionThree = 16
relaisStörung = 18

functionOneState = False
functionTwoState = False
errorState = False


def handleExit():
    gpio.cleanup()
    print('EXITED! ', hueLogic.getCurrentDateTime())
    sys.exit(0)


class NetworkWatchdog(Thread):

    def __init__(self):
        # Call the Thread class's init function
        Thread.__init__(self)

    def run(self):
        global errorState
        routerAddress = '192.168.178.1'
        errorCounter = 0
        while 1:
            result = ping(routerAddress)
            if not result or result is None:
                errorCounter =   1
            else:
                errorCounter = 0
            if errorCounter > 1:
                print('Netzwerk Fehler! Stör Relay an! ', hueLogic.getCurrentDateTime())
                errorState = True
                gpio.output(relaisStörung, gpio.HIGH)
            elif errorCounter < 1:
                if errorState:
                    print("Netzwerk Fehler behoben! Stör Relay normal! ", hueLogic.getCurrentDateTime())
                    errorState = False
                    gpio.output(relaisStörung, gpio.LOW)
            time.sleep(2)



# sys.stdout = open('/home/admin/Desktop/log.log', 'a ')
# sys.stderr = open('/home/admin/Desktop/log.log', 'a ')
atexit.register(handleExit)
hueLogic = HueLogic()
watchDog = NetworkWatchdog()
watchDog.daemon = True
watchDog.start()
print("--------------------------------")
print("Programm started! ", hueLogic.getCurrentDateTime())

gpio.setmode(gpio.BOARD)
gpio.setup(functionOne, gpio.IN, pull_up_down=gpio.PUD_DOWN)
gpio.setup(functionTwo, gpio.IN, pull_up_down=gpio.PUD_DOWN)
gpio.setup(functionThree, gpio.IN, pull_up_down=gpio.PUD_DOWN)
gpio.setup(relaisStörung, gpio.OUT)
# relais default on
gpio.output(relaisStörung, gpio.LOW)

gpio.add_event_detect(functionOne, gpio.BOTH, callback=hueLogic.functionOne, bouncetime=500)
gpio.add_event_detect(functionTwo, gpio.BOTH, callback=hueLogic.functionTwo, bouncetime=500)
gpio.add_event_detect(functionThree, gpio.BOTH, callback=hueLogic.functionThree, bouncetime=500)

Now my question is, why does this happen and if the solution is as simple as adding a while True loop at the end?

CodePudding user response：

make sure u excute

$sudo python main.py

instead of

$sudo main.py

also try to add

$chmod  x myscript.py

CodePudding user response：

When you run $ sudo cmd instead of $ cmd, several things are different. Definitely the uid reported by $ id will be different. But your $PATH is likely different, as well, and that's not the only env var that may change.

Insert a call to breakpoint() to let you isolate which of those many python statements is the one that causes trouble. Use the l list and n next commands to identify where you are in the execution so far.

Use commands like $ sudo which python and $ sudo python -m site to verify that you're running the expected version of interpreter and imported libraries.

Here is a generic way of assessing how your user & root env vars differ.

$      env | sort > /tmp/user.txt
$
$ sudo env | sort > /tmp/root.txt
$
$ diff -u /tmp/{user,root}.txt

It is possible that when running as a root user you will need to conda activate myproject, or similarly activate venv. There might be a .bashrc file you want to source.

Pay careful attention to PYTHONPATH -- it's a pretty important env var! It controls the value of sys.path, which matters for each of your import statements.