🔒 When spawning a subprocess, I get permission denied. This is on macOS

[brisk stirrup]

I am attempting to create a child process that kills the parent process, and then it ends itself. Currently, I am stuck on spawning the subprocess. Is there something I should/not be doing?
File: /main.py

def start_updater() -> None:
  subprocess.run("<path>/update/main.py", input=f"{os.getpid()}")

def main() -> None:
  start_updater()

File: /update/main.py

import sys
with open("<path>/update/input.txt", 'w') as file:
  for line in sys.stdin:
    file.write(f"{line}")
    break # Only will receive one line: the PID

[arctic socket]

@brisk stirrup

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[brisk stirrup]

Error message (paths edited for privacy):
https://paste.pythondiscord.com/3IHA

[lone crown]

hi

chmod +x <path/.py>

[brisk stirrup]

hi

[brisk stirrup]

what do you mean?

[split creek]

You can't directly run a python file IIRC

you have to run the interpreter with the python file as an argument

[lone crown]

you need to give executable permissions to your python file

the next step is making sure your script starts with
#!/usr/bin/env python3

then your subprocess.run() call would work

[lone crown]

i realise this is not a very good explanation

hm

[brisk stirrup]

I understand that, just not where I'm meant to do that... like in the subprocess call?

[lone crown]

ah you just need to run this in your terminal

[brisk stirrup]

ah okay, will do that now, thanks

[brisk stirrup]

What is an IIRC? And how would I run the interpreter with the file as an argument? I havent learnt anything about processes, threading (to an extent) and that type of thing yet...

[lone crown]

if i recall correctly

[lone crown]

but try this first

if it doesnt work, sure we can try that interpreter way
subprocess.run(["python3", "your_path/something/temp.py"])

[brisk stirrup]

It has worked, just the way i'm writing to the file is wrong (working on it)

So i wanted to fix that then say "it works"

oh actually wrong file

bytes object in sending the input to the subprocess

[brisk stirrup]

def start_updater() -> None:
  PID = os.getpid()
  subprocess.run("<path>/update/main.py", input=bytes(str(PID), "utf-8"))

It now works (found a number in the input.txt file)
Thanks @lone crown :3

Also, is there a way to give execution permission within code? (this is for a game designed to be distributed to users who don't program at all)
I'm using auto-py-to-exe to collect everything and create one executable (/main.py), so maybe that helps?

[lone crown]

i know there is a chmod method in the os library

but you may need to test it a bit - i am not sure if there will be any security/permissions problems (have not used that much)

[brisk stirrup]

Okay thanks!

!close

[arctic socket]

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