setup.py

#!/usr/bin/python3

import subprocess
import sys

args = list(sys.argv[0:4]) # just first 3 arguments (exclude distro arguments)
use_arch_iso = False # using Arch iso to install another distro?

try: # If distro to install not same as iso, pass arguments 4 and 5 (see README)
    distro = sys.argv[4]
    distro_name = sys.argv[5]
except IndexError:
    distro = subprocess.check_output(['./src/detect_os.sh', 'id']).decode('utf-8').replace('"', "").strip()
    distro_name = subprocess.check_output(['./src/detect_os.sh', 'name']).decode('utf-8').replace('"', "").strip()

if distro:
    try: # CAUTION: comment lines 19-26 if prepared manually
        if use_arch_iso:
            subprocess.check_output([f'./src/prep/arch_live.sh', f'{args[1]}', f'{args[2]}', f'{args[3]}'])
        else:
            subprocess.check_output([f'./src/prep/{distro}_live.sh', f'{args[1]}', f'{args[2]}', f'{args[3]}'])
    except subprocess.CalledProcessError as e:
        print(f"F: There was an error in prep steps! {e.output.decode('utf-8')}")
    else:
        __import__(f"src.distros.{distro}.installer")
else:
    print("F: Distribution could not be detected!")