Add functionality to download files from GCS, and include them in the Chromoting isolate.

testing/chromoting/download_test_files.py

+#!/usr/bin/python
+#
+"""A script to download files required for Remoting integration tests from GCS.
+
+  The script expects 2 parameters:
+
+    input_files: a file containing the full path in GCS to each file that is to
+                be downloaded.
+    output_folder: the folder to which the specified files should be downloaded.
+
+  This scripts expects that its execution is done on a machine where the
+  credentials are correctly setup to obtain the required permissions for
+  downloading files from the specified GCS buckets.
+"""
+
+import argparse
+import ntpath
+import os
+import subprocess
+import sys
+
+
+def CopyFromGCS(source, destination):
+  """Given path to a source file in GCS, copies it to the specified destination.
+
+  Assumes gsutil is accessible from command-shell (i.e., is in $PATH), and
+  required privileges to access GCS are available.
+
+  Args:
+    source: path to file in GCS.

[joedow, 2015/07/13 19:10:12]

nit: capitalize first letter of the first word.

[anandc, 2015/07/14 01:03:07]

Acknowledged.

+    destination: path to destination on local file system.
+  Returns:
+    True on success, False on failure.
+  """
+
+  cp_cmd = ['gsutil cp %s %s' % (source, destination)]
+  process = subprocess.Popen(cp_cmd, shell=True,
+                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  process.communicate()
+  if not process.returncode:
+    return True
+  return False

[joedow, 2015/07/13 19:10:12]

Is it pythonic to just use:
return (not process.returncode)?

[anandc, 2015/07/14 01:03:07]

Got rid of this function because it wasn't really doing much.

+
+
+def main():
+
+  parser = argparse.ArgumentParser()
+  parser.add_argument('-i', '--input_files',
+                      help='File specifying files to be downloaded .')
+  parser.add_argument(
+      '-o', '--output_folder',
+      help='Folder where specified files should be downloaded .')
+
+  if len(sys.argv) < 3:
+    parser.print_help()
+    sys.exit(1)
+
+  args = parser.parse_args()
+  if not args.input_files or not args.output_folder:
+    parser.print_help()
+    sys.exit(1)
+
+  with open(args.input_files) as f:
+    for line in f:
+      output_file = os.path.join(args.output_folder, ntpath.basename(line))
+      CopyFromGCS(line, output_file)
+
+if __name__ == '__main__':
+  main()