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#!/usr/bin/env python
# Copyright 2016-2020, Damian Johnson and The Tor Project
# See LICENSE for licensing information
"""
Caches tor's latest fallback directories.
"""
import re
import sys
import urllib.request
import stem.directory
import stem.util.system
GITWEB_FALLBACK_LOG = 'https://gitweb.torproject.org/tor.git/log/src/app/config/fallback_dirs.inc'
FALLBACK_DIR_LINK = b"href='/tor.git/commit/src/app/config/fallback_dirs.inc\\?id=([^']*)'"
if __name__ == '__main__':
try:
fallback_dir_page = urllib.request.urlopen(GITWEB_FALLBACK_LOG).read()
fallback_dir_commit = re.search(FALLBACK_DIR_LINK, fallback_dir_page).group(1).decode('utf-8')
except:
print("Unable to determine the latest commit to edit tor's fallback directories: %s" % sys.exc_info()[1])
sys.exit(1)
try:
stem_commit = stem.util.system.call('git rev-parse HEAD')[0]
except OSError as exc:
print("Unable to determine stem's current commit: %s" % exc)
sys.exit(1)
print('Latest tor commit editing fallback directories: %s' % fallback_dir_commit)
print('Current stem commit: %s' % stem_commit)
print('')
cached_fallback_directories = stem.directory.Fallback.from_cache()
latest_fallback_directories = stem.directory.Fallback.from_remote()
if cached_fallback_directories == latest_fallback_directories:
print('Fallback directories are already up to date, nothing to do.')
sys.exit(0)
# all fallbacks have the same header metadata, so just picking one
headers = list(latest_fallback_directories.values())[0].header if latest_fallback_directories else None
print('Differences detected...\n')
print(stem.directory._fallback_directory_differences(cached_fallback_directories, latest_fallback_directories))
stem.directory.Fallback._write(latest_fallback_directories, fallback_dir_commit, stem_commit, headers)
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