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119 lines
4.0 KiB
Python
Executable File
119 lines
4.0 KiB
Python
Executable File
#!/usr/bin/env python
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# Copyright (c) 2016 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 a file that contains a define that approximates the build date.
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build_type impacts the timestamp generated:
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- default: the build date is set to the most recent first Sunday of a month at
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5:00am. The reason is that it is a time where invalidating the build cache
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shouldn't have major reprecussions (due to lower load).
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- official: the build date is set to the current date at 5:00am, or the day
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before if the current time is before 5:00am.
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Either way, it is guaranteed to be in the past and always in UTC.
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It is also possible to explicitly set a build date to be used.
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"""
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import argparse
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import calendar
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import datetime
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import doctest
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import os
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import sys
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def GetFirstSundayOfMonth(year, month):
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"""Returns the first sunday of the given month of the given year.
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>>> GetFirstSundayOfMonth(2016, 2)
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7
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>>> GetFirstSundayOfMonth(2016, 3)
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6
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>>> GetFirstSundayOfMonth(2000, 1)
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2
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"""
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weeks = calendar.Calendar().monthdays2calendar(year, month)
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# Return the first day in the first week that is a Sunday.
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return [date_day[0] for date_day in weeks[0] if date_day[1] == 6][0]
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def GetBuildDate(build_type, utc_now):
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"""Gets the approximate build date given the specific build type.
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>>> GetBuildDate('default', datetime.datetime(2016, 2, 6, 1, 2, 3))
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'Jan 03 2016 01:02:03'
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>>> GetBuildDate('default', datetime.datetime(2016, 2, 7, 5))
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'Feb 07 2016 05:00:00'
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>>> GetBuildDate('default', datetime.datetime(2016, 2, 8, 5))
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'Feb 07 2016 05:00:00'
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"""
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day = utc_now.day
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month = utc_now.month
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year = utc_now.year
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if build_type != 'official':
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first_sunday = GetFirstSundayOfMonth(year, month)
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# If our build is after the first Sunday, we've already refreshed our build
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# cache on a quiet day, so just use that day.
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# Otherwise, take the first Sunday of the previous month.
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if day >= first_sunday:
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day = first_sunday
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else:
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month -= 1
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if month == 0:
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month = 12
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year -= 1
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day = GetFirstSundayOfMonth(year, month)
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now = datetime.datetime(
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year, month, day, utc_now.hour, utc_now.minute, utc_now.second)
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return '{:%b %d %Y %H:%M:%S}'.format(now)
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def main():
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if doctest.testmod()[0]:
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return 1
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argument_parser = argparse.ArgumentParser(
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description=sys.modules[__name__].__doc__,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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argument_parser.add_argument('output_file', help='The file to write to')
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argument_parser.add_argument(
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'build_type', help='The type of build', choices=('official', 'default'))
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argument_parser.add_argument(
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'build_date_override', nargs='?',
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help='Optional override for the build date. Format must be '
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'\'Mmm DD YYYY HH:MM:SS\'')
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args = argument_parser.parse_args()
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if args.build_date_override:
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# Format is expected to be "Mmm DD YYYY HH:MM:SS".
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build_date = args.build_date_override
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else:
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now = datetime.datetime.utcnow()
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if now.hour < 5:
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# The time is locked at 5:00 am in UTC to cause the build cache
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# invalidation to not happen exactly at midnight. Use the same calculation
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# as the day before.
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# See //base/build_time.cc.
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now = now - datetime.timedelta(days=1)
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now = datetime.datetime(now.year, now.month, now.day, 5, 0, 0)
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build_date = GetBuildDate(args.build_type, now)
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output = ('// Generated by //build/write_build_date_header.py\n'
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'#ifndef BUILD_DATE\n'
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'#define BUILD_DATE "{}"\n'
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'#endif // BUILD_DATE\n'.format(build_date))
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current_contents = ''
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if os.path.isfile(args.output_file):
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with open(args.output_file, 'r') as current_file:
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current_contents = current_file.read()
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if current_contents != output:
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with open(args.output_file, 'w') as output_file:
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output_file.write(output)
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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