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151 lines
4.3 KiB
Python
151 lines
4.3 KiB
Python
#!/usr/bin/env python
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# 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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import argparse
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import re
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import sys
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from collections import defaultdict
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import git_common as git
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FOOTER_PATTERN = re.compile(r'^\s*([\w-]+): (.*)$')
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CHROME_COMMIT_POSITION_PATTERN = re.compile(r'^([\w/-]+)@{#(\d+)}$')
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GIT_SVN_ID_PATTERN = re.compile('^([^\s@]+)@(\d+)')
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def normalize_name(header):
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return '-'.join([ word.title() for word in header.strip().split('-') ])
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def parse_footer(line):
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match = FOOTER_PATTERN.match(line)
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if match:
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return (match.group(1), match.group(2))
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else:
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return None
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def parse_footers(message):
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"""Parses a git commit message into a multimap of footers."""
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footer_lines = []
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for line in reversed(message.splitlines()):
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if line == '' or line.isspace():
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break
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footer_lines.append(line)
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footers = map(parse_footer, footer_lines)
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if not all(footers):
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return defaultdict(list)
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footer_map = defaultdict(list)
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for (k, v) in footers:
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footer_map[normalize_name(k)].append(v.strip())
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return footer_map
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def get_unique(footers, key):
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key = normalize_name(key)
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values = footers[key]
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assert len(values) <= 1, 'Multiple %s footers' % key
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if values:
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return values[0]
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else:
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return None
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def get_position(footers):
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"""Get the commit position from the footers multimap using a heuristic.
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Returns:
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A tuple of the branch and the position on that branch. For example,
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Cr-Commit-Position: refs/heads/master@{#292272}
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would give the return value ('refs/heads/master', 292272). If
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Cr-Commit-Position is not defined, we try to infer the ref and position
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from git-svn-id. The position number can be None if it was not inferrable.
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"""
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position = get_unique(footers, 'Cr-Commit-Position')
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if position:
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match = CHROME_COMMIT_POSITION_PATTERN.match(position)
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assert match, 'Invalid Cr-Commit-Position value: %s' % position
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return (match.group(1), match.group(2))
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svn_commit = get_unique(footers, 'git-svn-id')
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if svn_commit:
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match = GIT_SVN_ID_PATTERN.match(svn_commit)
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assert match, 'Invalid git-svn-id value: %s' % svn_commit
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# V8 has different semantics than Chromium.
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if re.match(r'.*https?://v8\.googlecode\.com/svn/trunk',
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match.group(1)):
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return ('refs/heads/candidates', match.group(2))
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if re.match(r'.*https?://v8\.googlecode\.com/svn/branches/bleeding_edge',
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match.group(1)):
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return ('refs/heads/master', match.group(2))
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# Assume that any trunk svn revision will match the commit-position
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# semantics.
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if re.match('.*/trunk.*$', match.group(1)):
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return ('refs/heads/master', match.group(2))
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# But for now only support faking branch-heads for chrome.
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branch_match = re.match('.*/chrome/branches/([\w/-]+)/src$', match.group(1))
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if branch_match:
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# svn commit numbers do not map to branches.
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return ('refs/branch-heads/%s' % branch_match.group(1), None)
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raise ValueError('Unable to infer commit position from footers')
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def main(args):
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parser = argparse.ArgumentParser(
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formatter_class=argparse.ArgumentDefaultsHelpFormatter
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)
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parser.add_argument('ref')
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g = parser.add_mutually_exclusive_group()
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g.add_argument('--key', metavar='KEY',
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help='Get all values for the given footer name, one per '
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'line (case insensitive)')
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g.add_argument('--position', action='store_true')
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g.add_argument('--position-ref', action='store_true')
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g.add_argument('--position-num', action='store_true')
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opts = parser.parse_args(args)
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message = git.run('log', '-1', '--format=%B', opts.ref)
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footers = parse_footers(message)
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if opts.key:
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for v in footers.get(normalize_name(opts.key), []):
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print v
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elif opts.position:
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pos = get_position(footers)
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print '%s@{#%s}' % (pos[0], pos[1] or '?')
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elif opts.position_ref:
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print get_position(footers)[0]
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elif opts.position_num:
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pos = get_position(footers)
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assert pos[1], 'No valid position for commit'
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print pos[1]
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else:
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for k in footers.keys():
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for v in footers[k]:
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print '%s: %s' % (k, v)
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return 0
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if __name__ == '__main__':
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try:
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sys.exit(main(sys.argv[1:]))
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except KeyboardInterrupt:
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sys.stderr.write('interrupted\n')
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sys.exit(1)
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