update.py

from logging import FileHandler, StreamHandler, INFO, basicConfig, error as log_error, info as log_info
from os import path as ospath, environ
from subprocess import run as srun
from requests import get as rget
from dotenv import load_dotenv
from pymongo import MongoClient

if ospath.exists('log.txt'):
    with open('log.txt', 'r+') as f:
        f.truncate(0)

basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                    handlers=[FileHandler('log.txt'), StreamHandler()],
                    level=INFO)

load_dotenv('config.env', override=True)

try:
    if bool(environ.get('_____REMOVE_THIS_LINE_____')):
        log_error('The README.md file there to be read! Exiting now!')
        exit()
except:
    pass

BOT_TOKEN = environ.get('BOT_TOKEN', '')
if len(BOT_TOKEN) == 0:
    log_error("BOT_TOKEN variable is missing! Exiting now")
    exit(1)

bot_id = int(BOT_TOKEN.split(':', 1)[0])

DATABASE_URL = environ.get('DATABASE_URL', '')
if len(DATABASE_URL) == 0:
    DATABASE_URL = None

if DATABASE_URL is not None:
    conn = MongoClient(DATABASE_URL)
    db = conn.mltb
    if config_dict := db.settings.config.find_one({'_id': bot_id}):  #retrun config dict (all env vars)
        environ['UPSTREAM_REPO'] = config_dict['UPSTREAM_REPO']
        environ['UPSTREAM_BRANCH'] = config_dict['UPSTREAM_BRANCH']
    conn.close()

UPSTREAM_REPO = environ.get('UPSTREAM_REPO', '')
if len(UPSTREAM_REPO) == 0:
   UPSTREAM_REPO = None

UPSTREAM_BRANCH = environ.get('UPSTREAM_BRANCH', '')
if len(UPSTREAM_BRANCH) == 0:
    UPSTREAM_BRANCH = 'master'

if UPSTREAM_REPO is not None:
    if ospath.exists('.git'):
        srun(["rm", "-rf", ".git"])

    update = srun([f"git init -q \
                     && git config --global user.email e.anastayyar@gmail.com \
                     && git config --global user.name mltb \
                     && git add . \
                     && git commit -sm update -q \
                     && git remote add origin {UPSTREAM_REPO} \
                     && git fetch origin -q \
                     && git reset --hard origin/{UPSTREAM_BRANCH} -q"], shell=True)

    if update.returncode == 0:
        log_info('Successfully updated with latest commit from UPSTREAM_REPO')
    else:
        log_error('Something went wrong while updating, check UPSTREAM_REPO if valid or not!')