Attachment 11185 Details for Bug 43613 – ucs-apt-hook → prevents removal of Univention's meta packages

ucs-apt-hook → prevents removal of Univention's meta packages

ucs-apt-hook (text/plain), 1.98 KB, created by Sönke Schwardt-Krummrich on 2024-02-02 11:00:35 CET

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Creator: Sönke Schwardt-Krummrich

Created: 2024-02-02 11:00:35 CET

Size: 1.98 KB

patch

obsolete

>#!/usr/bin/python3
>#
>
>import os
>import sys
>
>HOOK_NAME = 'ucs-apt-hook'
>FILE_OVERRIDE_HOOK = '/etc/apt/ucs-apt-hook.override'
>FILE_ENABLE_DEBUG = '/etc/apt/ucs-apt-hook.enable-debug'
>PROTECTED_PACKAGES = [
>    'univention-server-master',
>    'univention-server-backup',
>    'univention-server-slave',
>    'univention-server-member',
>]
>DEBUG = os.path.exists(FILE_ENABLE_DEBUG)
>
>
>def debug(msg: str) -> None:
>    if DEBUG:
>        print(f'D: {HOOK_NAME}: {msg}')
>
>
>def log(msg: str) -> None:
>    print(f'W: {HOOK_NAME}: {msg}')
>
>
>def die(msg: str) -> None:
>    print(f'E: {HOOK_NAME}: {msg}')
>    sys.exit(1)
>
>
>INFO_FD = os.environ.get('APT_HOOK_INFO_FD')
>if not INFO_FD or INFO_FD == '0' or not INFO_FD.isdigit():
>    die('APT_HOOK_INFO_FD not set up correctly')
>
>fd = os.fdopen(int(INFO_FD))
>if not fd:
>    die(f'could not open APT_HOOK_INFO_FD ({INFO_FD!r})')
>
>line = fd.readline().strip()
>debug(f'VERSION: {line!r}')
>if line != 'VERSION 2':
>    die('expecting hook protocol in version 2')
>
>for line in fd:
>    line = line.strip()
>    if not line:
>        break
>
>for line in fd:
>    line = line.strip()
>    debug(f'INPUT: {line!r}')
>    if not line:
>        continue
>
>    try:
>        pkg, oldver, direction, newver, action = line.split(' ', 4)
>    except ValueError:
>        log(f'received unexpected line from apt: {line!r}')
>        continue
>
>    if pkg in PROTECTED_PACKAGES:
>        if action == '**REMOVE**':
>            if not os.path.exists(FILE_OVERRIDE_HOOK):
>                for line in f'''
>!!! ERROR !!!
>An attempt was made to uninstall the {pkg!r} meta package.
>This usually leads to a defective UCS system. The trigger for the
>uninstallation attempt can be a problem when resolving automatic
>package dependencies or a manual uninstallation attempt.
>
>If this message occurred during an app installation/update/uninstall
>or a UCS system update, please visit
>https://help.univention.de/REPLACEME
>for the next steps.
>                '''.splitlines():
>                    log(line.strip())
>                sys.exit(1)

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Attachments on bug 43613: 11185