check for gitlab container updates

versioncheck.py

import subprocess
import sys
import os
import json
import re
import urllib.request

def find(iterable, pred):
    return next(filter(pred, iterable), None)

def find_all(iterable, pred):
    return list(filter(pred, iterable))

def exec_command(command, cwd = None):
    proc = subprocess.run(command, shell=True, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    if proc.returncode != 0:
        print(proc.stderr)
        sys.exit(proc.returncode)
    return proc.stdout.decode().rstrip()

def fetch_json(url):
    with urllib.request.urlopen(url) as res:
        return json.loads(res.read())

def need_update(current, latest):
    current_tuple = tuple(map(int, current.split(".")))
    latest_tuple = tuple(map(int, latest.split(".")))
    return latest_tuple > current_tuple

manifest = exec_command("docker-compose exec gitlab cat /opt/gitlab/version-manifest.txt", "/srv/gitlab")
current_version = re.match(r'^gitlab-ce\s+(?P<version_number>.+)', manifest).group("version_number")

latest_tags = fetch_json("https://hub.docker.com/v2/repositories/gitlab/gitlab-ce/tags?name=latest")
latest = find(latest_tags.get("results"), lambda x: x.get("name") == "latest")
latest_image = find(latest.get("images"), lambda x: x.get("architecture") == "amd64" and x.get("os") == "linux")
latest_digest = latest_image.get("digest")

tags = fetch_json("https://hub.docker.com/v2/repositories/gitlab/gitlab-ce/tags")
result = find_all(tags.get("results"), lambda x: find(x.get("images"), lambda x: x.get("digest") == latest_digest))
target = find(result, lambda x: re.match(r'\d+\.\d+\.\d+-ce\.\d', x.get("name")))
latest_version = re.match(r'(?P<version_number>\d+\.\d+\.\d+)', target.get("name")).group("version_number")

print(need_update(current_version, latest_version))