Expose ability to download network service impl in SDK.

mojo/services/network/download_network_service.py

-#!/usr/bin/env python
-# Copyright 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.
-
-import argparse
-import os
-import sys
-import tempfile
-import zipfile
-
-_PLATFORMS = ["linux-x64", "android-arm"]
-_APPS = ["network_service", "network_service_apptests"]
-
-if not sys.platform.startswith("linux"):
-  print "Not supported for your platform"
-  sys.exit(0)
-
-# Add //tools to the system path so that we can import the gs helper.
-script_dir = os.path.dirname(os.path.realpath(__file__))
-tools_path = os.path.join(script_dir, os.pardir, os.pardir, os.pardir, "tools")
-sys.path.insert(0, tools_path)
-# pylint: disable=F0401
-import gs
-
-
-def download_app(app, version, platform, prebuilt_directory):
-  binary_name = app + ".mojo"
-  gs_path = "gs://mojo/%s/%s/%s/%s.zip" % (app, version, platform, binary_name)
-  output_directory = os.path.join(prebuilt_directory, platform)
-
-  with tempfile.NamedTemporaryFile() as temp_zip_file:
-    gs.download_from_public_bucket(gs_path, temp_zip_file.name)
-    with zipfile.ZipFile(temp_zip_file.name) as z:
-      zi = z.getinfo(binary_name)
-      mode = zi.external_attr >> 16
-      z.extract(zi, output_directory)
-      os.chmod(os.path.join(output_directory, binary_name), mode)
-
-
-def main():
-  parser = argparse.ArgumentParser(
-      description="Download prebuilt network service binaries from google " +
-                  "storage")
-  parser.parse_args()
-
-  prebuilt_directory_path = os.path.join(script_dir, "prebuilt")
-  stamp_path = os.path.join(prebuilt_directory_path, "STAMP")
-  version_path = os.path.join(script_dir, "VERSION")
-  with open(version_path) as version_file:
-    version = version_file.read().strip()
-
-  try:
-    with open(stamp_path) as stamp_file:
-      current_version = stamp_file.read().strip()
-      if current_version == version:
-        return 0  # Already have the right version.
-  except IOError:
-    pass  # If the stamp file does not exist we need to download a new binary.
-
-  for platform in _PLATFORMS:
-    for app in _APPS:
-      download_app(app, version, platform, prebuilt_directory_path)
-
-  with open(stamp_path, 'w') as stamp_file:
-    stamp_file.write(version)
-  return 0
-
-
-if __name__ == "__main__":
-  sys.exit(main())