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#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
lastchange.py -- Chromium revision fetching utility.
"""
import re
import optparse
import os
import subprocess
import sys
_GIT_SVN_ID_REGEX = re.compile(r'.*git-svn-id:\s*([^@]*)@([0-9]+)', re.DOTALL)
class VersionInfo(object):
def __init__(self, url, revision):
self.url = url
self.revision = revision
def FetchSVNRevision(directory, svn_url_regex):
"""
Fetch the Subversion branch and revision for a given directory.
Errors are swallowed.
Returns:
A VersionInfo object or None on error.
"""
try:
proc = subprocess.Popen(['svn', 'info'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
cwd=directory,
shell=(sys.platform=='win32'))
except OSError:
# command is apparently either not installed or not executable.
return None
if not proc:
return None
attrs = {}
for line in proc.stdout:
line = line.strip()
if not line:
continue
key, val = line.split(': ', 1)
attrs[key] = val
try:
match = svn_url_regex.search(attrs['URL'])
if match:
url = match.group(2)
else:
url = ''
revision = attrs['Revision']
except KeyError:
return None
return VersionInfo(url, revision)
def RunGitCommand(directory, command):
"""
Launches git subcommand.
Errors are swallowed.
Returns:
A process object or None.
"""
command = ['git'] + command
# Force shell usage under cygwin. This is a workaround for
# mysterious loss of cwd while invoking cygwin's git.
# We can't just pass shell=True to Popen, as under win32 this will
# cause CMD to be used, while we explicitly want a cygwin shell.
if sys.platform == 'cygwin':
command = ['sh', '-c', ' '.join(command)]
try:
proc = subprocess.Popen(command,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
cwd=directory,
shell=(sys.platform=='win32'))
return proc
except OSError:
return None
def FetchGitRevision(directory):
"""
Fetch the Git hash for a given directory.
Errors are swallowed.
Returns:
A VersionInfo object or None on error.
"""
proc = RunGitCommand(directory, ['rev-parse', 'HEAD'])
if proc:
output = proc.communicate()[0].strip()
if proc.returncode == 0 and output:
return VersionInfo('git', output[:7])
return None
def FetchGitSVNURLAndRevision(directory, svn_url_regex):
"""
Fetch the Subversion URL and revision through Git.
Errors are swallowed.
Returns:
A tuple containing the Subversion URL and revision.
"""
proc = RunGitCommand(directory, ['log', '-1',
'--grep=git-svn-id', '--format=%b'])
if proc:
output = proc.communicate()[0].strip()
if proc.returncode == 0 and output:
# Extract the latest SVN revision and the SVN URL.
# The target line is the last "git-svn-id: ..." line like this:
# git-svn-id: svn://svn.chromium.org/chrome/trunk/src@85528 0039d316....
match = _GIT_SVN_ID_REGEX.search(output)
if match:
revision = match.group(2)
url_match = svn_url_regex.search(match.group(1))
if url_match:
url = url_match.group(2)
else:
url = ''
return url, revision
return None, None
def FetchGitSVNRevision(directory, svn_url_regex):
"""
Fetch the Git-SVN identifier for the local tree.
Errors are swallowed.
"""
url, revision = FetchGitSVNURLAndRevision(directory, svn_url_regex)
if url and revision:
return VersionInfo(url, revision)
return None
def FetchVersionInfo(default_lastchange, directory=None,
directory_regex_prior_to_src_url='chrome|svn'):
"""
Returns the last change (in the form of a branch, revision tuple),
from some appropriate revision control system.
"""
svn_url_regex = re.compile(
r'.*/(' + directory_regex_prior_to_src_url + r')(/.*)')
version_info = (FetchSVNRevision(directory, svn_url_regex) or
FetchGitSVNRevision(directory, svn_url_regex) or
FetchGitRevision(directory))
if not version_info:
if default_lastchange and os.path.exists(default_lastchange):
revision = open(default_lastchange, 'r').read().strip()
version_info = VersionInfo(None, revision)
else:
version_info = VersionInfo(None, None)
return version_info
def WriteIfChanged(file_name, contents):
"""
Writes the specified contents to the specified file_name
iff the contents are different than the current contents.
"""
try:
old_contents = open(file_name, 'r').read()
except EnvironmentError:
pass
else:
if contents == old_contents:
return
os.unlink(file_name)
open(file_name, 'w').write(contents)
def main(argv=None):
if argv is None:
argv = sys.argv
parser = optparse.OptionParser(usage="lastchange.py [options]")
parser.add_option("-d", "--default-lastchange", metavar="FILE",
help="default last change input FILE")
parser.add_option("-o", "--output", metavar="FILE",
help="write last change to FILE")
parser.add_option("--revision-only", action='store_true',
help="just print the SVN revision number")
opts, args = parser.parse_args(argv[1:])
out_file = opts.output
while len(args) and out_file is None:
if out_file is None:
out_file = args.pop(0)
if args:
sys.stderr.write('Unexpected arguments: %r\n\n' % args)
parser.print_help()
sys.exit(2)
version_info = FetchVersionInfo(opts.default_lastchange,
os.path.dirname(sys.argv[0]))
if version_info.revision == None:
version_info.revision = '0'
if opts.revision_only:
print version_info.revision
else:
contents = "LASTCHANGE=%s\n" % version_info.revision
if out_file:
WriteIfChanged(out_file, contents)
else:
sys.stdout.write(contents)
return 0
if __name__ == '__main__':
sys.exit(main())
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