The Tor Browser / file comparison
comparison: media/webrtc/trunk/build/util/lastchange.py
media/webrtc/trunk/build/util/lastchange.py
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:f57040ab99ea |
|---|---|
| 1 #!/usr/bin/env python | |
| 2 # Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 3 # Use of this source code is governed by a BSD-style license that can be | |
| 4 # found in the LICENSE file. | |
| 5 | |
| 6 """ | |
| 7 lastchange.py -- Chromium revision fetching utility. | |
| 8 """ | |
| 9 | |
| 10 import re | |
| 11 import optparse | |
| 12 import os | |
| 13 import subprocess | |
| 14 import sys | |
| 15 | |
| 16 _GIT_SVN_ID_REGEX = re.compile(r'.*git-svn-id:\s*([^@]*)@([0-9]+)', re.DOTALL) | |
| 17 | |
| 18 class VersionInfo(object): | |
| 19 def __init__(self, url, revision): | |
| 20 self.url = url | |
| 21 self.revision = revision | |
| 22 | |
| 23 | |
| 24 def FetchSVNRevision(directory, svn_url_regex): | |
| 25 """ | |
| 26 Fetch the Subversion branch and revision for a given directory. | |
| 27 | |
| 28 Errors are swallowed. | |
| 29 | |
| 30 Returns: | |
| 31 A VersionInfo object or None on error. | |
| 32 """ | |
| 33 try: | |
| 34 proc = subprocess.Popen(['svn', 'info'], | |
| 35 stdout=subprocess.PIPE, | |
| 36 stderr=subprocess.PIPE, | |
| 37 cwd=directory, | |
| 38 shell=(sys.platform=='win32')) | |
| 39 except OSError: | |
| 40 # command is apparently either not installed or not executable. | |
| 41 return None | |
| 42 if not proc: | |
| 43 return None | |
| 44 | |
| 45 attrs = {} | |
| 46 for line in proc.stdout: | |
| 47 line = line.strip() | |
| 48 if not line: | |
| 49 continue | |
| 50 key, val = line.split(': ', 1) | |
| 51 attrs[key] = val | |
| 52 | |
| 53 try: | |
| 54 match = svn_url_regex.search(attrs['URL']) | |
| 55 if match: | |
| 56 url = match.group(2) | |
| 57 else: | |
| 58 url = '' | |
| 59 revision = attrs['Revision'] | |
| 60 except KeyError: | |
| 61 return None | |
| 62 | |
| 63 return VersionInfo(url, revision) | |
| 64 | |
| 65 | |
| 66 def RunGitCommand(directory, command): | |
| 67 """ | |
| 68 Launches git subcommand. | |
| 69 | |
| 70 Errors are swallowed. | |
| 71 | |
| 72 Returns: | |
| 73 A process object or None. | |
| 74 """ | |
| 75 command = ['git'] + command | |
| 76 # Force shell usage under cygwin. This is a workaround for | |
| 77 # mysterious loss of cwd while invoking cygwin's git. | |
| 78 # We can't just pass shell=True to Popen, as under win32 this will | |
| 79 # cause CMD to be used, while we explicitly want a cygwin shell. | |
| 80 if sys.platform == 'cygwin': | |
| 81 command = ['sh', '-c', ' '.join(command)] | |
| 82 try: | |
| 83 proc = subprocess.Popen(command, | |
| 84 stdout=subprocess.PIPE, | |
| 85 stderr=subprocess.PIPE, | |
| 86 cwd=directory, | |
| 87 shell=(sys.platform=='win32')) | |
| 88 return proc | |
| 89 except OSError: | |
| 90 return None | |
| 91 | |
| 92 | |
| 93 def FetchGitRevision(directory): | |
| 94 """ | |
| 95 Fetch the Git hash for a given directory. | |
| 96 | |
| 97 Errors are swallowed. | |
| 98 | |
| 99 Returns: | |
| 100 A VersionInfo object or None on error. | |
| 101 """ | |
| 102 proc = RunGitCommand(directory, ['rev-parse', 'HEAD']) | |
| 103 if proc: | |
| 104 output = proc.communicate()[0].strip() | |
| 105 if proc.returncode == 0 and output: | |
| 106 return VersionInfo('git', output[:7]) | |
| 107 return None | |
| 108 | |
| 109 | |
| 110 def FetchGitSVNURLAndRevision(directory, svn_url_regex): | |
| 111 """ | |
| 112 Fetch the Subversion URL and revision through Git. | |
| 113 | |
| 114 Errors are swallowed. | |
| 115 | |
| 116 Returns: | |
| 117 A tuple containing the Subversion URL and revision. | |
| 118 """ | |
| 119 proc = RunGitCommand(directory, ['log', '-1', | |
| 120 '--grep=git-svn-id', '--format=%b']) | |
| 121 if proc: | |
| 122 output = proc.communicate()[0].strip() | |
| 123 if proc.returncode == 0 and output: | |
| 124 # Extract the latest SVN revision and the SVN URL. | |
| 125 # The target line is the last "git-svn-id: ..." line like this: | |
| 126 # git-svn-id: svn://svn.chromium.org/chrome/trunk/src@85528 0039d316.... | |
| 127 match = _GIT_SVN_ID_REGEX.search(output) | |
| 128 if match: | |
| 129 revision = match.group(2) | |
| 130 url_match = svn_url_regex.search(match.group(1)) | |
| 131 if url_match: | |
| 132 url = url_match.group(2) | |
| 133 else: | |
| 134 url = '' | |
| 135 return url, revision | |
| 136 return None, None | |
| 137 | |
| 138 | |
| 139 def FetchGitSVNRevision(directory, svn_url_regex): | |
| 140 """ | |
| 141 Fetch the Git-SVN identifier for the local tree. | |
| 142 | |
| 143 Errors are swallowed. | |
| 144 """ | |
| 145 url, revision = FetchGitSVNURLAndRevision(directory, svn_url_regex) | |
| 146 if url and revision: | |
| 147 return VersionInfo(url, revision) | |
| 148 return None | |
| 149 | |
| 150 | |
| 151 def FetchVersionInfo(default_lastchange, directory=None, | |
| 152 directory_regex_prior_to_src_url='chrome|svn'): | |
| 153 """ | |
| 154 Returns the last change (in the form of a branch, revision tuple), | |
| 155 from some appropriate revision control system. | |
| 156 """ | |
| 157 svn_url_regex = re.compile( | |
| 158 r'.*/(' + directory_regex_prior_to_src_url + r')(/.*)') | |
| 159 | |
| 160 version_info = (FetchSVNRevision(directory, svn_url_regex) or | |
| 161 FetchGitSVNRevision(directory, svn_url_regex) or | |
| 162 FetchGitRevision(directory)) | |
| 163 if not version_info: | |
| 164 if default_lastchange and os.path.exists(default_lastchange): | |
| 165 revision = open(default_lastchange, 'r').read().strip() | |
| 166 version_info = VersionInfo(None, revision) | |
| 167 else: | |
| 168 version_info = VersionInfo(None, None) | |
| 169 return version_info | |
| 170 | |
| 171 | |
| 172 def WriteIfChanged(file_name, contents): | |
| 173 """ | |
| 174 Writes the specified contents to the specified file_name | |
| 175 iff the contents are different than the current contents. | |
| 176 """ | |
| 177 try: | |
| 178 old_contents = open(file_name, 'r').read() | |
| 179 except EnvironmentError: | |
| 180 pass | |
| 181 else: | |
| 182 if contents == old_contents: | |
| 183 return | |
| 184 os.unlink(file_name) | |
| 185 open(file_name, 'w').write(contents) | |
| 186 | |
| 187 | |
| 188 def main(argv=None): | |
| 189 if argv is None: | |
| 190 argv = sys.argv | |
| 191 | |
| 192 parser = optparse.OptionParser(usage="lastchange.py [options]") | |
| 193 parser.add_option("-d", "--default-lastchange", metavar="FILE", | |
| 194 help="default last change input FILE") | |
| 195 parser.add_option("-o", "--output", metavar="FILE", | |
| 196 help="write last change to FILE") | |
| 197 parser.add_option("--revision-only", action='store_true', | |
| 198 help="just print the SVN revision number") | |
| 199 opts, args = parser.parse_args(argv[1:]) | |
| 200 | |
| 201 out_file = opts.output | |
| 202 | |
| 203 while len(args) and out_file is None: | |
| 204 if out_file is None: | |
| 205 out_file = args.pop(0) | |
| 206 if args: | |
| 207 sys.stderr.write('Unexpected arguments: %r\n\n' % args) | |
| 208 parser.print_help() | |
| 209 sys.exit(2) | |
| 210 | |
| 211 version_info = FetchVersionInfo(opts.default_lastchange, | |
| 212 os.path.dirname(sys.argv[0])) | |
| 213 | |
| 214 if version_info.revision == None: | |
| 215 version_info.revision = '0' | |
| 216 | |
| 217 if opts.revision_only: | |
| 218 print version_info.revision | |
| 219 else: | |
| 220 contents = "LASTCHANGE=%s\n" % version_info.revision | |
| 221 if out_file: | |
| 222 WriteIfChanged(out_file, contents) | |
| 223 else: | |
| 224 sys.stdout.write(contents) | |
| 225 | |
| 226 return 0 | |
| 227 | |
| 228 | |
| 229 if __name__ == '__main__': | |
| 230 sys.exit(main()) |
