| # Copyright 2020 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. |
| |
| """Git utilities.""" |
| |
| import datetime |
| import json |
| import logging |
| import subprocess |
| |
| |
| def _run_git(*cmd): |
| """Runs a git command and returns the output.""" |
| cmd = ['git'] + list(cmd) |
| return subprocess.check_output(cmd) |
| |
| |
| def _get_commit_message(rev): |
| """Gets the commit message for a revision.""" |
| return _run_git('log', '--format=%B', '-n', '1', rev) |
| |
| |
| def get_commit_date(rev): |
| """Gets the date a commit was committed.""" |
| raw_date = _run_git('show', '--no-patch', '--no-notes', '--pretty=%cd', |
| rev).strip() |
| # The last space separate section is timezone. '%z' doesn't let us parse this |
| # because python datetime (in 2.7, at least) doesn't support parsing timezones |
| # by default. |
| split = raw_date.split(' ') |
| raw_date, tz = ' '.join(split[:-1]), split[-1] |
| # `git log` seems to always give us dates in UTC. Parsing the UTC timezone |
| # itself is hard, so just enforce that we always get UTC for now. |
| assert tz == '+0000', 'Expected git timezone %s, got %s.' % ('+0000', tz) |
| return datetime.datetime.strptime(raw_date.strip(), '%a %b %d %H:%M:%S %Y') |
