text: #!/usr/bin/env python2
  # Copyright (c) 2015 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.
  
  
  """Download recipe prerequisites and run a single recipe."""
  
  
  import base64
  import json
  import os
  import subprocess
  import sys
  import tarfile
  import urllib2
  import zlib
  
  
  def download(source, dest):
    u = urllib2.urlopen(source)  # TODO: Verify certificate?
    with open(dest, 'wb') as f:
      while True:
        buf = u.read(8192)
        if not buf:
          break
        f.write(buf)
  
  
  def unzip(source, dest):
    with tarfile.open(source, 'r') as z:
      z.extractall(dest)
  
  
  def get_infra(dt_dir, root_dir):
    fetch = os.path.join(dt_dir, 'fetch.py')
    subprocess.check_call([sys.executable, fetch, 'infra'], cwd=root_dir)
  
  
  def seed_properties(args):
    # Assumes args[0] is factory properties and args[1] is build properties.
    fact_prop_str = args[0][len('--factory-properties-gz='):]
    build_prop_str = args[1][len('--build-properties-gz='):]
    fact_prop = json.loads(zlib.decompress(base64.b64decode(fact_prop_str)))
    build_prop = json.loads(zlib.decompress(base64.b64decode(build_prop_str)))
    for k, v in fact_prop.iteritems():
      print '@@@SET_BUILD_PROPERTY@%s@%s@@@' % (k, v)
    for k, v in build_prop.iteritems():
      print '@@@SET_BUILD_PROPERTY@%s@%s@@@' % (k, v)
  
  
  def main(args):
    cwd = os.getcwd()
  
    # Bootstrap depot tools (required for fetching build/infra)
    dt_url = 'https://storage.googleapis.com/dumbtest/depot_tools.tar.gz'
    dt_dir = os.path.join(cwd, 'staging')
    os.makedirs(dt_dir)
    dt_zip = os.path.join(dt_dir, 'depot_tools.tar.gz')
    download(dt_url, os.path.join(dt_zip))
    unzip(dt_zip, dt_dir)
    dt_path = os.path.join(dt_dir, 'depot_tools')
    os.environ['PATH'] = '%s:%s' % (dt_path, os.environ['PATH'])
  
    # Fetch infra (which comes with build, which comes with recipes)
    root_dir = os.path.join(cwd, 'b')
    os.makedirs(root_dir)
    get_infra(dt_path, root_dir)
    work_dir = os.path.join(root_dir, 'build', 'slave', 'bot', 'build')
    os.makedirs(work_dir)
  
    # Emit annotations that encapsulates build properties.
    seed_properties(args)
  
    # JUST DO IT.
    cmd = [sys.executable, '-u', '../../../scripts/slave/annotated_run.py']
    cmd.extend(args)
    subprocess.check_call(cmd, cwd=work_dir)
  
  if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))
  