mirror of
https://github.com/klzgrad/naiveproxy.git
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101 lines
2.6 KiB
Python
101 lines
2.6 KiB
Python
# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Writes the most recent "Cr-Commit-Position" value on the master branch
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to a C header file.
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Usage: last_commit_position.py <dir> <outfile> <headerguard>
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<dir>
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Some directory inside the repo to check. This will be used as the current
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directory when running git. It's best to pass the repo toplevel directory.
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<outfile>
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C header file to write.
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<headerguard>
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String to use as the header guard for the written file.
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"""
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import os
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import re
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import subprocess
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import sys
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def RunGitCommand(directory, command):
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"""
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Launches git subcommand.
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Errors are swallowed.
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Returns:
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A process object or None.
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"""
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command = ['git'] + command
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# Force shell usage under cygwin. This is a workaround for
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# mysterious loss of cwd while invoking cygwin's git.
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# We can't just pass shell=True to Popen, as under win32 this will
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# cause CMD to be used, while we explicitly want a cygwin shell.
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if sys.platform == 'cygwin':
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command = ['sh', '-c', ' '.join(command)]
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try:
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proc = subprocess.Popen(command,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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cwd=directory,
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shell=(sys.platform=='win32'))
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return proc
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except OSError:
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return None
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def FetchCommitPosition(directory):
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regex = re.compile(r'\s*Cr-Commit-Position: refs/heads/master@\{#(\d+)\}\s*')
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# Search this far backward in the git log. The commit position should be
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# close to the top. We allow some slop for long commit messages, and maybe
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# there were some local commits after the last "official" one. Having this
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# max prevents us from searching all history in the case of an error.
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max_lines = 2048
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proc = RunGitCommand(directory, ['log'])
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for i in range(max_lines):
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line = proc.stdout.readline()
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if not line:
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return None
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match = regex.match(line)
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if match:
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return match.group(1)
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return None
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def WriteHeader(header_file, header_guard, value):
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with open(header_file, 'w') as f:
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f.write('''/* Generated by last_commit_position.py. */
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#ifndef %(guard)s
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#define %(guard)s
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#define LAST_COMMIT_POSITION "%(value)s"
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#endif
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''' % {'guard': header_guard, 'value': value})
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if len(sys.argv) != 4:
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print "Wrong number of arguments"
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sys.exit(1)
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git_directory = sys.argv[1]
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output_file = sys.argv[2]
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header_guard = sys.argv[3]
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value = FetchCommitPosition(git_directory)
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if not value:
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value = 'UNKNOWN'
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WriteHeader(output_file, header_guard, value)
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