Add a snapshot of flutter/engine/src/build to our sdk

build/util/version.py

+#!/usr/bin/env python
+# Copyright 2014 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.
+
+"""
+version.py -- Chromium version string substitution utility.
+"""
+
+import argparse
+import os
+import sys
+
+
+def fetch_values_from_file(values_dict, file_name):
+  """
+  Fetches KEYWORD=VALUE settings from the specified file.
+
+  Everything to the left of the first '=' is the keyword,
+  everything to the right is the value.  No stripping of
+  white space, so beware.
+
+  The file must exist, otherwise you get the Python exception from open().
+  """
+  for line in open(file_name, 'r').readlines():
+    key, val = line.rstrip('\r\n').split('=', 1)
+    values_dict[key] = val
+
+
+def fetch_values(file_list):
+  """
+  Returns a dictionary of values to be used for substitution, populating
+  the dictionary with KEYWORD=VALUE settings from the files in 'file_list'.
+
+  Explicitly adds the following value from internal calculations:
+
+    OFFICIAL_BUILD
+  """
+  CHROME_BUILD_TYPE = os.environ.get('CHROME_BUILD_TYPE')
+  if CHROME_BUILD_TYPE == '_official':
+    official_build = '1'
+  else:
+    official_build = '0'
+
+  values = dict(
+    OFFICIAL_BUILD = official_build,
+  )
+
+  for file_name in file_list:
+    fetch_values_from_file(values, file_name)
+
+  return values
+
+
+def subst_template(contents, values):
+  """
+  Returns the template with substituted values from the specified dictionary.
+
+  Keywords to be substituted are surrounded by '@':  @KEYWORD@.
+
+  No attempt is made to avoid recursive substitution.  The order
+  of evaluation is random based on the order of the keywords returned
+  by the Python dictionary.  So do NOT substitute a value that
+  contains any @KEYWORD@ strings expecting them to be recursively
+  substituted, okay?
+  """
+  for key, val in values.iteritems():
+    try:
+      contents = contents.replace('@' + key + '@', val)
+    except TypeError:
+      print repr(key), repr(val)
+  return contents
+
+
+def subst_file(file_name, values):
+  """
+  Returns the contents of the specified file_name with substituted
+  values from the specified dictionary.
+
+  This is like subst_template, except it operates on a file.
+  """
+  template = open(file_name, 'r').read()
+  return subst_template(template, values);
+
+
+def write_if_changed(file_name, contents):
+  """
+  Writes the specified contents to the specified file_name
+  iff the contents are different than the current contents.
+  """
+  try:
+    old_contents = open(file_name, 'r').read()
+  except EnvironmentError:
+    pass
+  else:
+    if contents == old_contents:
+      return
+    os.unlink(file_name)
+  open(file_name, 'w').write(contents)
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('-f', '--file', action='append', default=[],
+                      help='Read variables from FILE.')
+  parser.add_argument('-i', '--input', default=None,
+                      help='Read strings to substitute from FILE.')
+  parser.add_argument('-o', '--output', default=None,
+                      help='Write substituted strings to FILE.')
+  parser.add_argument('-t', '--template', default=None,
+                      help='Use TEMPLATE as the strings to substitute.')
+  parser.add_argument('-e', '--eval', action='append', default=[],
+                      help='Evaluate VAL after reading variables. Can be used '
+                           'to synthesize variables. e.g. -e \'PATCH_HI=int('
+                           'PATCH)/256.')
+  parser.add_argument('args', nargs=argparse.REMAINDER,
+                      help='For compatibility: INPUT and OUTPUT can be '
+                           'passed as positional arguments.')
+  options = parser.parse_args()
+
+  evals = {}
+  for expression in options.eval:
+    try:
+      evals.update(dict([expression.split('=', 1)]))
+    except ValueError:
+      parser.error('-e requires VAR=VAL')
+
+  # Compatibility with old versions that considered the first two positional
+  # arguments shorthands for --input and --output.
+  while len(options.args) and (options.input is None or \
+                               options.output is None):
+    if options.input is None:
+      options.input = options.args.pop(0)
+    elif options.output is None:
+      options.output = options.args.pop(0)
+  if options.args:
+    parser.error('Unexpected arguments: %r' % options.args)
+
+  values = fetch_values(options.file)
+  for key, val in evals.iteritems():
+    values[key] = str(eval(val, globals(), values))
+
+  if options.template is not None:
+    contents = subst_template(options.template, values)
+  elif options.input:
+    contents = subst_file(options.input, values)
+  else:
+    # Generate a default set of version information.
+    contents = """MAJOR=%(MAJOR)s
+MINOR=%(MINOR)s
+BUILD=%(BUILD)s
+PATCH=%(PATCH)s
+LASTCHANGE=%(LASTCHANGE)s
+OFFICIAL_BUILD=%(OFFICIAL_BUILD)s
+""" % values
+
+  if options.output is not None:
+    write_if_changed(options.output, contents)
+  else:
+    print contents
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())