#!/usr/bin/python -B # Copyright 2017 The Android Open Source Project # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Downloads the latest IANA timezone data.""" import ftplib import os import shutil import subprocess import sys sys.path.append('%s/external/icu/tools' % os.environ.get('ANDROID_BUILD_TOP')) import i18nutil import tzdatautil # Calculate the paths that are referred to by multiple functions. android_build_top = i18nutil.GetAndroidRootOrDie() iana_data_dir = os.path.realpath('%s/system/timezone/input_data/iana' % android_build_top) def FtpRetrieveFile(ftp, filename): ftp.retrbinary('RETR %s' % filename, open(filename, 'wb').write) def CheckSignature(data_filename, signature_filename): """Checks the signature of a file.""" print 'Verifying signature...' try: subprocess.check_call(['gpg', '--trusted-key=ED97E90E62AA7E34', '--verify', signature_filename, data_filename]) except subprocess.CalledProcessError as err: print 'Unable to verify signature' print '\n\n******' print 'If this fails for you, you probably need to import Paul Eggert''s public key:' print ' gpg --receive-keys ED97E90E62AA7E34' print '******\n\n' raise # Run with no arguments from any directory, with no special setup required. # See http://www.iana.org/time-zones/ for more about the source of this data. def main(): print 'Looking for new IANA tzdata...' iana_tar_filenames = [] ftp = ftplib.FTP('ftp.iana.org') ftp.login() ftp.cwd('tz/releases') for filename in ftp.nlst(): if "/" in filename: print "FTP server returned bogus file name" sys.exit(1) if filename.startswith('tzdata20') and filename.endswith('.tar.gz'): iana_tar_filenames.append(filename) iana_tar_filenames.sort(reverse=True) if len(iana_tar_filenames) == 0: print 'No tzdata files found' sys.exit(1) latest_iana_tar_filename = iana_tar_filenames[0] local_iana_tar_file = tzdatautil.GetIanaTarFile(iana_data_dir, 'data') if local_iana_tar_file: local_iana_tar_filename = os.path.basename(local_iana_tar_file) if latest_iana_tar_filename <= local_iana_tar_filename: print 'Available data %s is older or the same as current data %s' % (latest_iana_tar_filename, local_iana_tar_filename) sys.exit(0) print 'Found new tzdata: %s' % latest_iana_tar_filename i18nutil.SwitchToNewTemporaryDirectory() print 'Downloading data (%s)...' % latest_iana_tar_filename FtpRetrieveFile(ftp, latest_iana_tar_filename) signature_filename = '%s.asc' % latest_iana_tar_filename print 'Downloading signature (%s)...' % signature_filename FtpRetrieveFile(ftp, signature_filename) CheckSignature(latest_iana_tar_filename, signature_filename) new_local_iana_tar_file = '%s/%s' % (iana_data_dir, latest_iana_tar_filename) shutil.copyfile(latest_iana_tar_filename, new_local_iana_tar_file) new_local_signature_file = '%s/%s' % (iana_data_dir, signature_filename) shutil.copyfile(signature_filename, new_local_signature_file) # Delete the existing local IANA tar file, if there is one. if local_iana_tar_file: os.remove(local_iana_tar_file) local_signature_file = '%s.asc' % local_iana_tar_file if os.path.exists(local_signature_file): os.remove(local_signature_file) print 'Look in %s for new IANA data files' % new_local_iana_tar_file sys.exit(0) if __name__ == '__main__': main()