1つ前のマイナーバージョンの最新パッチに更新する

要件

• major.minor.patch の semantic versioning に従っている
• このスクリプトを適切な頻度で実行する

スクリプト

#!/usr/bin/env python

import os
import re
import subprocess


def pick_versions(yum_list):
    current = None
    versions = {}
    for line in yum_list.splitlines():
        if line == 'Installed Packages':
            is_current = True
            continue
        elif line == 'Available Packages':
            is_current = False
            continue

        _, full_version, _ = line.split()
        matched = re.match(r'(\d+)\.(\d+)\.(\d+).*', full_version)
        numeric_version = tuple(int(matched.group(i)) for i in range(1, 4))
        if is_current:
            current = numeric_version
        else:
            versions[numeric_version] = full_version
    return current, versions


def get_target(current, versions):
    newer_versions = set(x[:2] for x in versions.keys() if current[:2] < x[:2])
    if len(newer_versions) > 1:
        target_version = sorted(newer_versions)[0]  # avoid jump
    else:
        target_version = current[:2]

    target_updates = [x for x in versions.keys() if x[:2] == target_version]
    return max(target_updates) if target_updates else None


package_name = 'gitlab-ee'
os.putenv('LANG', 'C')
subprocess.call(['yum', 'check-update'], stdout=subprocess.PIPE)
yum_list = subprocess.check_output(['yum', '--showduplicates', '--quiet', 'list', package_name])
current, versions = pick_versions(yum_list)
target = get_target(current, versions)
if target is not None:
    subprocess.call(['yum', 'update', '-y', package_name + '-' + versions[target]])