Makes GetBuildTime behave identically on all build types.

build/write_build_date_header.py

Index: build/write_build_date_header.py
diff --git a/build/write_build_date_header.py b/build/write_build_date_header.py
new file mode 100755
index 0000000000000000000000000000000000000000..f7445cc1bb5c6f53168a64d96ba42e65a55acc1a
--- /dev/null
+++ b/build/write_build_date_header.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+# Copyright (c) 2016 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.

[M-A Ruel, 2016/02/04 15:24:13]

...
# found in the LICENSE file.

"""Writes a file that contains a define that approximates the build date.

The build date is set to the most recent first Sunday of a month, in UTC time.
"""

[Zachary Forman, 2016/02/04 22:29:11]

Done

+"""
+Writes a file that contains a define that approximates the build date.
+The build date is set to the most recent first Sunday of a month, in GMT time.
+"""
+
+from calendar import Calendar

[M-A Ruel, 2016/02/04 15:24:13]

The style is to import only the package, then sort.

[Zachary Forman, 2016/02/04 22:29:11]

Acknowledged and fixed.

+from datetime import datetime, date
+import argparse
+import sys
+
+
+def GetFirstSundayOfMonth(month, year):
+  """

[M-A Ruel, 2016/02/04 15:24:13]

"""Returns ...

same everywhere.

[Zachary Forman, 2016/02/04 22:29:11]

Done

+  Returns the first sunday of the given month of the given year.
+  """
+  cal = Calendar()
+  weeks = cal.monthdays2calendar(year, month)

[M-A Ruel, 2016/02/04 15:24:13]

weeks = calendar.Calendar().monthdays2calendar(year, month)

[Zachary Forman, 2016/02/04 22:29:11]

Done

+  # Return the first day in the first week that is a Sunday.
+  return [ date_day[0] for date_day in weeks[0] if date_day[1] == 6][0]

[M-A Ruel, 2016/02/04 15:24:13]

return [date_day[0] ...

[Zachary Forman, 2016/02/04 22:29:11]

Done

+
+
+def GetBuildDate(build_type):
+  """
+  Gets the approximate build date given the specific build type.
+  """
+  gmt_now = datetime.utcnow()
+  day = gmt_now.day
+  month = gmt_now.month
+  year = gmt_now.year
+  if build_type != 'official':
+    first_sunday = GetFirstSundayOfMonth(month, year)
+    # If our build is after the first Sunday, we've already refreshed our build
+    # cache on a quiet day, so just use that day.
+    # Otherwise, take the first Sunday of the previous month.
+    if day >= first_sunday:
+      day = first_sunday
+    else:
+      month -= 1
+      if month == 0:
+        month = 12
+        year -= 1
+      day = GetFirstSundayOfMonth(month, year)
+  return "{:%b %d %Y}".format(date(year, month, day))
+
+
+def main():
+  argument_parser = argparse.ArgumentParser()
+  argument_parser.add_argument('output_file', help='The file to write to')
+  argument_parser.add_argument('build_type', help='The type of build')

[M-A Ruel, 2016/02/04 15:24:13]

Use choices=().

[Zachary Forman, 2016/02/04 22:29:11]

Done

+  argument_parser.add_argument('build_date_override', nargs='?', default=None,

[M-A Ruel, 2016/02/04 15:24:13]

Remove default=None, it's the default.

[Zachary Forman, 2016/02/04 22:29:11]

Done

+                               help='Optional override for the build date')
+  args = argument_parser.parse_args()
+
+  if args.build_date_override is not None:

[M-A Ruel, 2016/02/04 15:24:13]

if args.build_date_override:

[Zachary Forman, 2016/02/04 22:29:11]

Done

+    build_date = args.build_date_override
+  else:
+    build_date = GetBuildDate(args.build_type)
+
+  with open(args.output_file, 'w') as output_file:
+    output_file.write('// Generated by //build/write_build_date_header.py\n')
+    output_file.write('#ifndef BUILD_DATE\n')
+    output_file.write('#define BUILD_DATE \"{}\"\n'.format(build_date))
+    output_file.write('#endif // BUILD_DATE\n')
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())