Script to automatically upgrade Emby on Debian or Ubuntu

embupdate.py

#!/usr/bin/env python3

from bs4 import BeautifulSoup
import requests
import json
import subprocess
import sys
import certifi

def log_error(e):
    """
    It is always a good idea to log errors.
    This function just prints them, but you can
    make it do anything.
    """
    print(e)

def cmp_version(local, remote):
    """Compare two version strings for sorting"""

    local = local.split('.')
    remote = remote.split('.')

    for i,_ in enumerate(local):
        octet1 = int(local[i])
        octet2 = int(remote[i])
        if octet1 < octet2:
            return 1
        elif octet1 > octet2:
            return -1
        else:
            continue
    return 0


def download(url, dest="/tmp/emby.deb"):
    print(f"Downloading {url}")
    req_file = requests.get(url, stream=True)

    with open(dest, 'wb') as fd:
        for chunk in req_file.iter_content(chunk_size=128):
            fd.write(chunk)

    return dest


def get_local_version():
    # Get version of emby on system
    try:
        cmd = 'dpkg-query -s emby-server | grep Version | awk -F":" \'{print $2; exit}\''
        cp = subprocess.run(['/bin/bash', '-o', 'pipefail', '-c', cmd], check=True, capture_output=True)
        version = cp.stdout.strip()
    except subprocess.CalledProcessError as e:
        # emby not installed
        return 0

def get_remote_json():
    # Get latest release json
    try:
        req_json = requests.get('https://api.github.com/repos/MediaBrowser/Emby.Releases/releases/latest')
        data = json.loads(req_json.text)
        if req_json.status_code != 200 or not data:
            raise Exception("couldn't get valid json response from github")
        for asset in data['assets']:
            release_name = asset['name']
            if release_name.startswith('emby-server-deb_'):
                if release_name.endswith('_amd64.deb'):
                    release_name = release_name.replace('emby-server-deb_', '')
                    version = release_name.replace('_amd64.deb', '')
                    return (version, asset)
        raise Exception(f"no suitable release candidate found: {data}")
    except Exception as e:
        log_error(e)
        sys.exit(1)


def install(deb):
    print(subprocess.getoutput(f'dpkg -i {deb}'))


if __name__ == "__main__":
    # Get installed version
    local_version = get_local_version()
    remote_version, remote_json = get_remote_json()
    if not local_version:
        print(f"Emby not installed, installing {remote_version} from github")
        # Install Emby
        install(download(remote_json['browser_download_url']))
    else:
        print(f"Installed Emby Version: {local_version}")
        if cmp_version(local_version, remote_version):
            print(f"Remote version {remote_version} is newer, installing")
            # Install Emby
            install(download(remote_json['browser_download_url']))
        else:
            print("Latest version already installed")