143 lines
7.1 KiB
Python
143 lines
7.1 KiB
Python
"""在 47 服务器的独立命名空间恢复备份，不替换当前服务或删除文件。"""
|
|
|
|
import argparse
|
|
import hashlib
|
|
import json
|
|
import os
|
|
from pathlib import Path
|
|
import shutil
|
|
import sqlite3
|
|
import subprocess
|
|
import tarfile
|
|
import time
|
|
|
|
|
|
DATABASE_NAME = 'smail.db'
|
|
|
|
|
|
def run(*args):
|
|
return subprocess.check_output(args, text=True).strip()
|
|
|
|
|
|
def database_path(root):
|
|
data = root / 'data'
|
|
files = sorted(path for path in data.rglob('*.db')
|
|
if path.is_file() or path.is_symlink())
|
|
expected = data / DATABASE_NAME
|
|
assert files == [expected], '正式验收要求运行目录仅保留 data/smail.db'
|
|
assert expected.is_file() and not expected.is_symlink(), '活动数据库不能是符号链接'
|
|
return expected
|
|
|
|
|
|
def database_counts(root):
|
|
counts = {}
|
|
database_path_value = database_path(root)
|
|
with sqlite3.connect(f'file:{database_path_value}?mode=ro', uri=True) as database:
|
|
assert database.execute('PRAGMA integrity_check').fetchone()[0] == 'ok'
|
|
tables = database.execute("SELECT name FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%'").fetchall()
|
|
counts[DATABASE_NAME] = {
|
|
table: database.execute('SELECT COUNT(*) FROM "' + table.replace('"', '""') + '"').fetchone()[0]
|
|
for (table,) in tables
|
|
}
|
|
return counts
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('backup')
|
|
parser.add_argument('--archive-sha', required=True)
|
|
args = parser.parse_args()
|
|
assert os.geteuid() == 0 and run('hostname') == 'ikun2'
|
|
backup = Path(args.backup).resolve(strict=True)
|
|
assert backup.parent == Path('/var/backups') and backup.name.startswith('smail-before-')
|
|
archive = backup / 'smail.tar.gz'
|
|
with archive.open('rb') as stream:
|
|
assert hashlib.file_digest(stream, 'sha256').hexdigest() == args.archive_sha, '备份摘要不匹配'
|
|
memory = dict(line.split(':', 1) for line in Path('/proc/meminfo').read_text().splitlines())
|
|
assert int(memory['MemAvailable'].split()[0]) >= 256 * 1024, '可用内存不足，暂停恢复演练'
|
|
stamp = time.strftime('%Y%m%d-%H%M%S')
|
|
target = Path('/var/tmp') / ('smail-review-restore-' + stamp)
|
|
target.mkdir(mode=0o700)
|
|
with tarfile.open(archive) as stream:
|
|
for member in stream.getmembers():
|
|
path = Path(member.name)
|
|
assert not path.is_absolute() and '..' not in path.parts and path.parts[0] == 'smail'
|
|
assert member.isdir() or member.isfile(), '备份含特殊文件，停止自动恢复'
|
|
subprocess.run(['tar', '-xzf', str(archive), '-C', str(target)], check=True)
|
|
restored = target / 'smail'
|
|
control = target / 'control'
|
|
control.mkdir(mode=0o750)
|
|
shutil.chown(control, user='smail', group='smail')
|
|
before = database_counts(restored)
|
|
live_pid = run('systemctl', 'show', 'smail.service', '--property=MainPID', '--value')
|
|
unit = 'smail-restore-review-' + stamp
|
|
result = {'backup': str(backup), 'restore': str(target), 'unit': unit, 'before': before}
|
|
try:
|
|
subprocess.run([
|
|
'systemd-run', '--unit=' + unit, '--property=User=smail', '--property=Group=smail',
|
|
'--property=PrivateNetwork=yes', '--property=PrivateTmp=yes',
|
|
'--property=ProtectSystem=strict', '--property=ProtectHome=yes',
|
|
'--property=NoNewPrivileges=yes', '--property=CapabilityBoundingSet=CAP_NET_BIND_SERVICE',
|
|
'--property=AmbientCapabilities=CAP_NET_BIND_SERVICE',
|
|
'--property=MemoryMax=128M', '--property=MemorySwapMax=0', '--property=CPUQuota=25%',
|
|
'--property=TasksMax=128', '--property=RuntimeMaxSec=180s', '--property=OOMPolicy=stop',
|
|
'--property=KillMode=control-group', '--property=TimeoutStopSec=10s',
|
|
'--property=BindPaths=' + str(restored) + ':/opt/smail ' + str(control) + ':/run/smail',
|
|
'--property=ReadWritePaths=/opt/smail /run/smail',
|
|
'--property=WorkingDirectory=/opt/smail', '--setenv=SMAIL_ROOT=/opt/smail',
|
|
'--setenv=GOMEMLIMIT=96MiB', '--setenv=GOMAXPROCS=1',
|
|
'/opt/smail/smail',
|
|
], check=True)
|
|
ready = False
|
|
for _ in range(60):
|
|
pid = run('systemctl', 'show', unit, '--property=MainPID', '--value')
|
|
if pid != '0':
|
|
probe = subprocess.run([
|
|
'nsenter', '--target', pid, '--net', 'curl', '--silent', '--fail', '--max-time', '2',
|
|
'--noproxy', '*', '--cacert', str(restored / 'ssl/custom.crt'),
|
|
'--resolve', 'mail.solit.cn:443:127.0.0.1', 'https://mail.solit.cn/api/ping',
|
|
], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
|
|
if probe.returncode == 0:
|
|
ready = True
|
|
break
|
|
time.sleep(1)
|
|
assert ready, '恢复服务未就绪'
|
|
assert os.readlink('/proc/' + pid + '/ns/net') != os.readlink('/proc/' + live_pid + '/ns/net')
|
|
assert os.stat('/proc/' + pid + '/root/opt/smail/data/smail.db').st_ino == (restored / 'data/smail.db').stat().st_ino
|
|
assert (restored / 'data/smail.db').stat().st_ino != Path('/opt/smail/data/smail.db').stat().st_ino
|
|
probe = r'''
|
|
import smtplib,ssl,sys
|
|
from email.message import EmailMessage
|
|
message=EmailMessage()
|
|
message['From']='restore@review.invalid'
|
|
message['To']='remotecheck@solit.cn'
|
|
message['Subject']='restore-review'
|
|
message['Message-ID']='<restore-'+sys.argv[2]+'@review.invalid>'
|
|
message.set_content('restore database write check')
|
|
context=ssl.create_default_context(cafile=sys.argv[1])
|
|
with smtplib.SMTP('127.0.0.1',25,timeout=20) as client:
|
|
client.ehlo('restore.invalid')
|
|
client._host='mail.solit.cn'
|
|
client.starttls(context=context)
|
|
client.ehlo('restore.invalid')
|
|
assert not client.send_message(message)
|
|
'''
|
|
subprocess.run(['nsenter', '--target', pid, '--net', 'python3', '-c', probe,
|
|
str(restored / 'ssl/custom.crt'), stamp], check=True)
|
|
with sqlite3.connect(f'file:{restored / "data/smail.db"}?mode=ro', uri=True) as database:
|
|
assert database.execute('SELECT COUNT(*) FROM email WHERE msg_id=?', ('restore-' + stamp + '@review.invalid',)).fetchone()[0] == 1
|
|
with sqlite3.connect('file:/opt/smail/data/smail.db?mode=ro', uri=True) as database:
|
|
assert database.execute('SELECT COUNT(*) FROM email WHERE msg_id=?', ('restore-' + stamp + '@review.invalid',)).fetchone()[0] == 0
|
|
result.update(ready=True, isolated=True, restored_smtp=True, live_pid_unchanged=live_pid == run(
|
|
'systemctl', 'show', 'smail.service', '--property=MainPID', '--value'))
|
|
finally:
|
|
subprocess.run(['systemctl', 'stop', unit], check=True)
|
|
result['after'] = database_counts(restored)
|
|
result['service_log'] = run('journalctl', '-u', unit, '--no-pager', '-n', '80')
|
|
(target / 'result.json').write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding='utf-8')
|
|
print(json.dumps({key: value for key, value in result.items() if key not in ('before', 'after', 'service_log')}, ensure_ascii=False, indent=2))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|