Tools/Scripts/check-github-mirror-integrity

#!/usr/bin/env python3

# Copyright (C) 2021 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1.  Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2.  Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os
import sys

from webkitpy import webkitscmpy
from webkitscmpy import remote


def main():
    repository = remote.Svn('https://svn.webkit.org/repository/webkit')
    mirror = remote.GitHub('https://github.com/WebKit/WebKit')

    canonical_tip = repository.commit(branch='trunk')
    mirror_tip = mirror.commit(branch='main')

    if mirror_tip.identifier == canonical_tip.identifier:
        print('GitHub and svn.webkit.org are in sync')
        print(f'HEAD commit on GitHub {mirror_tip} matches HEAD commit on svn.webkit.org {canonical_tip}')
        return 0

    if mirror_tip.timestamp >= canonical_tip.timestamp - 5 * 60 and mirror_tip.identifier == canonical_tip.identifier - 1:
        print('GitHub is 1 commit behind svn.webkit.org. This is ok.')
        print(f'HEAD commit on GitHub {mirror_tip} slightly behind HEAD commit on svn.webkit.org {canonical_tip}')
        return 0

    print('ERROR: GitHub and svn.webkit.org are out of sync')
    print(f'HEAD commit on GitHub {mirror_tip} out of sync with HEAD commit on svn.webkit.org {canonical_tip}')
    print('This indicates a serious error with the repository, please inform admin@webkit.org urgently')
    return 1


if '__main__' == __name__:
    sys.exit(main())