Checks latest Mattermost version, compares against installed version from .env, stops, updates container, finally deletes orphaned container(s)

mm_docker-update.py

#!/bin/python3
# © 2023 Markus Busche, elpatron@mailbox.org
# - Checks latest Mattermost version
# - Compares against installed version from .env
# - Stops, updates container
# - Finally deletes orphaned container(s)
import re
from urllib import response
import requests
from os.path import exists
from requests_html import HTMLSession
from packaging import version
import subprocess

WEBHOOKURL = '<your Mattermost webhook url>'
CHANNEL = 'Town Square'

def getLatestVersion():
    downloadUrl = ""

    session = HTMLSession()
    r = session.get('https://mattermost.com/deploy/')
    htmlPageText=r.text
    
    regex = r'https:\/\/releases\.mattermost\.com\/\d+\.\d+\.\d+\/mattermost-\d+\.\d+\.\d+-linux-amd64\.tar\.gz'
    downloadUrl = ''
    version = ''

    try:
        downloadUrl = re.findall(regex, htmlPageText)[0]
    except:
        pass
    
    try:
        version = re.findall(r'\d+\.\d+\.\d+', downloadUrl)[0]
    except:
        pass
        
    return downloadUrl, version
    
def readInstalledVersion():
    with open('.env', 'r') as file:
        text = file.read().rstrip()
    line = re.findall('MATTERMOST_IMAGE_TAG=\d\.\d\.\d', text)[0]
    result = line.split('=')[1]
    return result

def updateEnv(version):
    with open('.env', 'r') as file:
        content = file.read()
        content_new = re.sub('MATTERMOST_IMAGE_TAG=\d\.\d\.\d', 'MATTERMOST_IMAGE_TAG=' + version, content, flags = re.M)
    with open('.env', 'w') as file:
        file.write(content_new)
    
def isNewer(latestVersion, installedVersion):
    return installedversion.parse(latestVersion) > installedversion.parse(installedVersion)

def sendMM(text):
    headers = {'Content-Type': 'application/json',}
    values = '{ "channel": "' + CHANNEL + '", "text": "' + text + '"}'
    response = requests.post(WEBHOOKURL, headers=headers, data=values)
    return response.status_code

def updateContainer():
    print('Stop running container')
    # docker compose -f docker-compose.yml -f docker-compose.nginx.yml down
    args = 'compose -f docker-compose.yml -f docker-compose.nginx.yml down'
    result = subprocess.run(['docker', 'args'], capture_output=True, text=True)
    print('Update container')
    # docker compose -f docker-compose.yml -f docker-compose.nginx.yml up -d
    args = 'compose -f docker-compose.yml -f docker-compose.nginx.yml up -d'
    result = subprocess.run(['docker', 'args'], capture_output=True, text=True)
    print('Prune orphaned container(s)')
    # docker image prune -a --force
    args = 'image prune -a --force'
    result = subprocess.run(['docker', 'args'], capture_output=True, text=True)
    
if __name__ == "__main__":
    installedversion = readInstalledVersion()
    print('Installed version: ' + installedversion)
    url, latestversion = getLatestVersion()
    
    if (isNewer(latestversion, installedversion)):
        print('New Mattermost version found, information updated:')
        print('Installed version: ' + installedversion)
        print('Latest version: ' + latestversion)
        print('Updating .env')
        updateEnv(latestversion)
        updateContainer()
        
        text = 'New Mattermost version found!\nLatest version: ' + latestversion + \
        '\nFormer version: ' + installedversion + \
        '\n[Release notes](https://docs.mattermost.com/install/self-managed-changelog.html)'
        result = sendMM(text=text)
        print('Message sent: ' + str(result))
    else:
        print('Nothing to do (you are up-to-date).')