Neil Fuller | ad3a1e6 | 2018-05-14 16:36:40 +0100 | [diff] [blame] | 1 | #!/usr/bin/python -B |
| 2 | |
| 3 | # Copyright 2017 The Android Open Source Project |
| 4 | # |
| 5 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | # you may not use this file except in compliance with the License. |
| 7 | # You may obtain a copy of the License at |
| 8 | # |
| 9 | # http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | # |
| 11 | # Unless required by applicable law or agreed to in writing, software |
| 12 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | # See the License for the specific language governing permissions and |
| 15 | # limitations under the License. |
| 16 | |
| 17 | """Downloads the latest IANA timezone data.""" |
| 18 | |
| 19 | import argparse |
| 20 | import ftplib |
| 21 | import os |
| 22 | import shutil |
| 23 | import subprocess |
| 24 | import sys |
| 25 | |
| 26 | sys.path.append('%s/external/icu/tools' % os.environ.get('ANDROID_BUILD_TOP')) |
| 27 | import i18nutil |
| 28 | import tzdatautil |
| 29 | |
| 30 | # Calculate the paths that are referred to by multiple functions. |
| 31 | android_build_top = i18nutil.GetAndroidRootOrDie() |
| 32 | iana_data_dir = os.path.realpath('%s/system/timezone/input_data/iana' % android_build_top) |
| 33 | iana_tools_dir = os.path.realpath('%s/system/timezone/input_tools/iana' % android_build_top) |
| 34 | |
| 35 | def FtpRetrieveFile(ftp, filename): |
| 36 | ftp.retrbinary('RETR %s' % filename, open(filename, 'wb').write) |
| 37 | |
| 38 | |
| 39 | def CheckSignature(data_filename, signature_filename): |
| 40 | """Checks the signature of a file.""" |
| 41 | print 'Verifying signature of %s using %s...' % (data_filename, signature_filename) |
| 42 | try: |
| 43 | subprocess.check_call(['gpg', '--trusted-key=ED97E90E62AA7E34', '--verify', |
| 44 | signature_filename, data_filename]) |
| 45 | except subprocess.CalledProcessError as err: |
| 46 | print 'Unable to verify signature' |
| 47 | print '\n\n******' |
| 48 | print 'If this fails for you, you probably need to import Paul Eggert''s public key:' |
| 49 | print ' gpg --receive-keys ED97E90E62AA7E34' |
| 50 | print '******\n\n' |
| 51 | raise |
| 52 | |
| 53 | |
| 54 | def FindLatestRemoteTar(ftp, file_prefix): |
| 55 | iana_tar_filenames = [] |
| 56 | |
| 57 | for filename in ftp.nlst(): |
| 58 | if "/" in filename: |
| 59 | print "FTP server returned bogus file name" |
| 60 | sys.exit(1) |
| 61 | |
| 62 | if filename.startswith(file_prefix) and filename.endswith('.tar.gz'): |
| 63 | iana_tar_filenames.append(filename) |
| 64 | |
| 65 | iana_tar_filenames.sort(reverse=True) |
| 66 | |
| 67 | if len(iana_tar_filenames) == 0: |
| 68 | print 'No files found' |
| 69 | sys.exit(1) |
| 70 | |
| 71 | return iana_tar_filenames[0] |
| 72 | |
| 73 | |
| 74 | def DownloadAndReplaceLocalFiles(file_prefixes, ftp, local_dir): |
| 75 | output_files = [] |
| 76 | |
| 77 | for file_prefix in file_prefixes: |
| 78 | latest_iana_tar_filename = FindLatestRemoteTar(ftp, file_prefix) |
| 79 | local_iana_tar_file = tzdatautil.GetIanaTarFile(local_dir, file_prefix) |
| 80 | if local_iana_tar_file: |
| 81 | local_iana_tar_filename = os.path.basename(local_iana_tar_file) |
| 82 | if latest_iana_tar_filename <= local_iana_tar_filename: |
| 83 | print('Latest remote file for %s is called %s and is older or the same as' |
| 84 | ' current local file %s' |
| 85 | % (local_dir, latest_iana_tar_filename, local_iana_tar_filename)) |
| 86 | continue |
| 87 | |
| 88 | print 'Found new %s* file for %s: %s' % (file_prefix, local_dir, latest_iana_tar_filename) |
| 89 | i18nutil.SwitchToNewTemporaryDirectory() |
| 90 | |
| 91 | print 'Downloading file %s...' % latest_iana_tar_filename |
| 92 | FtpRetrieveFile(ftp, latest_iana_tar_filename) |
| 93 | |
| 94 | signature_filename = '%s.asc' % latest_iana_tar_filename |
| 95 | print 'Downloading signature %s...' % signature_filename |
| 96 | FtpRetrieveFile(ftp, signature_filename) |
| 97 | |
| 98 | CheckSignature(latest_iana_tar_filename, signature_filename) |
| 99 | |
| 100 | new_local_iana_tar_file = '%s/%s' % (local_dir, latest_iana_tar_filename) |
| 101 | shutil.copyfile(latest_iana_tar_filename, new_local_iana_tar_file) |
| 102 | new_local_signature_file = '%s/%s' % (local_dir, signature_filename) |
| 103 | shutil.copyfile(signature_filename, new_local_signature_file) |
| 104 | |
| 105 | output_files.append(new_local_iana_tar_file) |
| 106 | output_files.append(new_local_signature_file) |
| 107 | |
| 108 | # Delete the existing local IANA tar file, if there is one. |
| 109 | if local_iana_tar_file: |
| 110 | os.remove(local_iana_tar_file) |
| 111 | |
| 112 | local_signature_file = '%s.asc' % local_iana_tar_file |
| 113 | if os.path.exists(local_signature_file): |
| 114 | os.remove(local_signature_file) |
| 115 | |
| 116 | return output_files |
| 117 | |
| 118 | # Run from any directory after having run source/envsetup.sh / lunch |
| 119 | # See http://www.iana.org/time-zones/ for more about the source of this data. |
| 120 | def main(): |
| 121 | parser = argparse.ArgumentParser(description=('Update IANA files from upstream')) |
| 122 | parser.add_argument('--notools', help='Skip tools files', action='store_true') |
| 123 | parser.add_argument('--nodata', help='Skip data files', action='store_true') |
| 124 | args = parser.parse_args() |
| 125 | if args.notools and args.nodata: |
| 126 | parser.error("Nothing to do") |
| 127 | sys.exit(1) |
| 128 | |
| 129 | print 'Looking for new IANA files...' |
| 130 | |
| 131 | ftp = ftplib.FTP('ftp.iana.org') |
| 132 | ftp.login() |
| 133 | ftp.cwd('tz/releases') |
| 134 | |
| 135 | output_files = [] |
| 136 | if not args.notools: |
| 137 | # The tools and data files are kept separate to make the updates independent. |
| 138 | # This means we duplicate the tzdata20xx file (once in the tools dir, once |
| 139 | # in the data dir) but the contents of the data tar appear to be needed for |
| 140 | # the zic build. |
| 141 | new_files = DownloadAndReplaceLocalFiles(['tzdata20', 'tzcode20'], ftp, iana_tools_dir) |
| 142 | output_files += new_files |
| 143 | if not args.nodata: |
| 144 | new_files = DownloadAndReplaceLocalFiles(['tzdata20'], ftp, iana_data_dir) |
| 145 | output_files += new_files |
| 146 | |
| 147 | if len(output_files) == 0: |
| 148 | print 'No files updated' |
| 149 | else: |
| 150 | print 'New files:' |
| 151 | for output_file in output_files: |
| 152 | print ' %s' % output_file |
| 153 | |
| 154 | |
| 155 | if __name__ == '__main__': |
| 156 | main() |