Move //tools/gs.py into //mojo/public/tools

mojo/public/tools/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"]
+_CURRENT_PATH = os.path.dirname(os.path.realpath(__file__))
+sys.path.insert(0, os.path.join(_CURRENT_PATH, "pylib"))
+import gs
 
 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__))
 
-# TODO(blundell): Determine whether to move gs.py into the SDK or to inline the
-# contents of that function in this file as is done in download_shell_binary.py.
-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):
+def download_app(app, version, tools_directory):
   prebuilt_directory = os.path.join(script_dir, "prebuilt/%s" % app)
   stamp_path = os.path.join(prebuilt_directory, "VERSION")
 
   try:
     with open(stamp_path) as stamp_file:
       current_version = stamp_file.read().strip()
       if current_version == version:
         return  # 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:
-    download_app_for_platform(app, version, platform)
+    download_app_for_platform(app, version, platform, tools_directory)
 
   with open(stamp_path, 'w') as stamp_file:
     stamp_file.write(version)
 
-def download_app_for_platform(app, version, platform):
+def download_app_for_platform(app, version, platform, tools_directory):
+  find_depot_tools_path = os.path.join(_CURRENT_PATH, tools_directory)
   binary_name = app + ".mojo"
   gs_path = "gs://mojo/%s/%s/%s/%s.zip" % (app, version, platform, binary_name)
   output_directory = os.path.join(script_dir,
                                   "prebuilt/%s/%s" % (app, platform))
 
   with tempfile.NamedTemporaryFile() as temp_zip_file:
-    gs.download_from_public_bucket(gs_path, temp_zip_file.name)
+    gs.download_from_public_bucket(gs_path, temp_zip_file.name,
+                                   find_depot_tools_path)
     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()
+  parser.add_argument("--tools-directory",
+                      dest="tools_directory",
+                      metavar="<tools-directory>",
+                      type=str,
+                      required=True,
+                      help="Path to the directory containing "
+                           "find_depot_tools.py, specified as a relative path "
+                           "from the location of this file.")
+  args = parser.parse_args()
 
   version_path = os.path.join(script_dir, "NETWORK_SERVICE_VERSION")
   with open(version_path) as version_file:
     version = version_file.read().strip()
 
   for app in _APPS:
-    download_app(app, version)
+    download_app(app, version, args.tools_directory)
 
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())