1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/webrtc/trunk/build/util/lastchange.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,230 @@
1.4 +#!/usr/bin/env python
1.5 +# Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.6 +# Use of this source code is governed by a BSD-style license that can be
1.7 +# found in the LICENSE file.
1.8 +
1.9 +"""
1.10 +lastchange.py -- Chromium revision fetching utility.
1.11 +"""
1.12 +
1.13 +import re
1.14 +import optparse
1.15 +import os
1.16 +import subprocess
1.17 +import sys
1.18 +
1.19 +_GIT_SVN_ID_REGEX = re.compile(r'.*git-svn-id:\s*([^@]*)@([0-9]+)', re.DOTALL)
1.20 +
1.21 +class VersionInfo(object):
1.22 + def __init__(self, url, revision):
1.23 + self.url = url
1.24 + self.revision = revision
1.25 +
1.26 +
1.27 +def FetchSVNRevision(directory, svn_url_regex):
1.28 + """
1.29 + Fetch the Subversion branch and revision for a given directory.
1.30 +
1.31 + Errors are swallowed.
1.32 +
1.33 + Returns:
1.34 + A VersionInfo object or None on error.
1.35 + """
1.36 + try:
1.37 + proc = subprocess.Popen(['svn', 'info'],
1.38 + stdout=subprocess.PIPE,
1.39 + stderr=subprocess.PIPE,
1.40 + cwd=directory,
1.41 + shell=(sys.platform=='win32'))
1.42 + except OSError:
1.43 + # command is apparently either not installed or not executable.
1.44 + return None
1.45 + if not proc:
1.46 + return None
1.47 +
1.48 + attrs = {}
1.49 + for line in proc.stdout:
1.50 + line = line.strip()
1.51 + if not line:
1.52 + continue
1.53 + key, val = line.split(': ', 1)
1.54 + attrs[key] = val
1.55 +
1.56 + try:
1.57 + match = svn_url_regex.search(attrs['URL'])
1.58 + if match:
1.59 + url = match.group(2)
1.60 + else:
1.61 + url = ''
1.62 + revision = attrs['Revision']
1.63 + except KeyError:
1.64 + return None
1.65 +
1.66 + return VersionInfo(url, revision)
1.67 +
1.68 +
1.69 +def RunGitCommand(directory, command):
1.70 + """
1.71 + Launches git subcommand.
1.72 +
1.73 + Errors are swallowed.
1.74 +
1.75 + Returns:
1.76 + A process object or None.
1.77 + """
1.78 + command = ['git'] + command
1.79 + # Force shell usage under cygwin. This is a workaround for
1.80 + # mysterious loss of cwd while invoking cygwin's git.
1.81 + # We can't just pass shell=True to Popen, as under win32 this will
1.82 + # cause CMD to be used, while we explicitly want a cygwin shell.
1.83 + if sys.platform == 'cygwin':
1.84 + command = ['sh', '-c', ' '.join(command)]
1.85 + try:
1.86 + proc = subprocess.Popen(command,
1.87 + stdout=subprocess.PIPE,
1.88 + stderr=subprocess.PIPE,
1.89 + cwd=directory,
1.90 + shell=(sys.platform=='win32'))
1.91 + return proc
1.92 + except OSError:
1.93 + return None
1.94 +
1.95 +
1.96 +def FetchGitRevision(directory):
1.97 + """
1.98 + Fetch the Git hash for a given directory.
1.99 +
1.100 + Errors are swallowed.
1.101 +
1.102 + Returns:
1.103 + A VersionInfo object or None on error.
1.104 + """
1.105 + proc = RunGitCommand(directory, ['rev-parse', 'HEAD'])
1.106 + if proc:
1.107 + output = proc.communicate()[0].strip()
1.108 + if proc.returncode == 0 and output:
1.109 + return VersionInfo('git', output[:7])
1.110 + return None
1.111 +
1.112 +
1.113 +def FetchGitSVNURLAndRevision(directory, svn_url_regex):
1.114 + """
1.115 + Fetch the Subversion URL and revision through Git.
1.116 +
1.117 + Errors are swallowed.
1.118 +
1.119 + Returns:
1.120 + A tuple containing the Subversion URL and revision.
1.121 + """
1.122 + proc = RunGitCommand(directory, ['log', '-1',
1.123 + '--grep=git-svn-id', '--format=%b'])
1.124 + if proc:
1.125 + output = proc.communicate()[0].strip()
1.126 + if proc.returncode == 0 and output:
1.127 + # Extract the latest SVN revision and the SVN URL.
1.128 + # The target line is the last "git-svn-id: ..." line like this:
1.129 + # git-svn-id: svn://svn.chromium.org/chrome/trunk/src@85528 0039d316....
1.130 + match = _GIT_SVN_ID_REGEX.search(output)
1.131 + if match:
1.132 + revision = match.group(2)
1.133 + url_match = svn_url_regex.search(match.group(1))
1.134 + if url_match:
1.135 + url = url_match.group(2)
1.136 + else:
1.137 + url = ''
1.138 + return url, revision
1.139 + return None, None
1.140 +
1.141 +
1.142 +def FetchGitSVNRevision(directory, svn_url_regex):
1.143 + """
1.144 + Fetch the Git-SVN identifier for the local tree.
1.145 +
1.146 + Errors are swallowed.
1.147 + """
1.148 + url, revision = FetchGitSVNURLAndRevision(directory, svn_url_regex)
1.149 + if url and revision:
1.150 + return VersionInfo(url, revision)
1.151 + return None
1.152 +
1.153 +
1.154 +def FetchVersionInfo(default_lastchange, directory=None,
1.155 + directory_regex_prior_to_src_url='chrome|svn'):
1.156 + """
1.157 + Returns the last change (in the form of a branch, revision tuple),
1.158 + from some appropriate revision control system.
1.159 + """
1.160 + svn_url_regex = re.compile(
1.161 + r'.*/(' + directory_regex_prior_to_src_url + r')(/.*)')
1.162 +
1.163 + version_info = (FetchSVNRevision(directory, svn_url_regex) or
1.164 + FetchGitSVNRevision(directory, svn_url_regex) or
1.165 + FetchGitRevision(directory))
1.166 + if not version_info:
1.167 + if default_lastchange and os.path.exists(default_lastchange):
1.168 + revision = open(default_lastchange, 'r').read().strip()
1.169 + version_info = VersionInfo(None, revision)
1.170 + else:
1.171 + version_info = VersionInfo(None, None)
1.172 + return version_info
1.173 +
1.174 +
1.175 +def WriteIfChanged(file_name, contents):
1.176 + """
1.177 + Writes the specified contents to the specified file_name
1.178 + iff the contents are different than the current contents.
1.179 + """
1.180 + try:
1.181 + old_contents = open(file_name, 'r').read()
1.182 + except EnvironmentError:
1.183 + pass
1.184 + else:
1.185 + if contents == old_contents:
1.186 + return
1.187 + os.unlink(file_name)
1.188 + open(file_name, 'w').write(contents)
1.189 +
1.190 +
1.191 +def main(argv=None):
1.192 + if argv is None:
1.193 + argv = sys.argv
1.194 +
1.195 + parser = optparse.OptionParser(usage="lastchange.py [options]")
1.196 + parser.add_option("-d", "--default-lastchange", metavar="FILE",
1.197 + help="default last change input FILE")
1.198 + parser.add_option("-o", "--output", metavar="FILE",
1.199 + help="write last change to FILE")
1.200 + parser.add_option("--revision-only", action='store_true',
1.201 + help="just print the SVN revision number")
1.202 + opts, args = parser.parse_args(argv[1:])
1.203 +
1.204 + out_file = opts.output
1.205 +
1.206 + while len(args) and out_file is None:
1.207 + if out_file is None:
1.208 + out_file = args.pop(0)
1.209 + if args:
1.210 + sys.stderr.write('Unexpected arguments: %r\n\n' % args)
1.211 + parser.print_help()
1.212 + sys.exit(2)
1.213 +
1.214 + version_info = FetchVersionInfo(opts.default_lastchange,
1.215 + os.path.dirname(sys.argv[0]))
1.216 +
1.217 + if version_info.revision == None:
1.218 + version_info.revision = '0'
1.219 +
1.220 + if opts.revision_only:
1.221 + print version_info.revision
1.222 + else:
1.223 + contents = "LASTCHANGE=%s\n" % version_info.revision
1.224 + if out_file:
1.225 + WriteIfChanged(out_file, contents)
1.226 + else:
1.227 + sys.stdout.write(contents)
1.228 +
1.229 + return 0
1.230 +
1.231 +
1.232 +if __name__ == '__main__':
1.233 + sys.exit(main())
