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#!/usr/bin/env python
# Copyright (c) 2010 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 optparse
import os
import re
import subprocess
import sys
def FetchSVNRevision(command):
"""
Fetch the Subversion revision for the local tree.
Errors are swallowed.
"""
try:
proc = subprocess.Popen(command,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
shell=(sys.platform=='win32'))
except OSError:
# command is apparently either not installed or not executable.
return None
if proc:
svn_re = re.compile('^Revision:\s+(\d+)', re.M)
match = svn_re.search(proc.stdout.read())
if match:
return match.group(1)
return None
def FetchChange(default_lastchange):
"""
Returns the last change, from some appropriate revision control system.
"""
change = FetchSVNRevision(['svn', 'info'])
if not change and sys.platform in ('linux2',):
change = FetchSVNRevision(['git', 'svn', 'info'])
if not change:
if default_lastchange and os.path.exists(default_lastchange):
change = open(default_lastchange, 'r').read().strip()
else:
change = '0'
return change
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)
change = FetchChange(opts.default_lastchange)
if opts.revision_only:
print change
else:
contents = "LASTCHANGE=%s\n" % change
if out_file:
WriteIfChanged(out_file, contents)
else:
sys.stdout.write(contents)
return 0
if __name__ == '__main__':
sys.exit(main())
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