Provides a wrapper script to download a Snakemake Blob, and then extract to a location. This should be moved to be packaged alongside snakemake

download.py

	#!/usr/bin/env python

	importargparse
	importdatetime

	fromgoogle.cloudimportstorage

	defdownload_blob(bucket_name, source_blob_name, destination_file_name):
	"""Downloads a blob from the bucket."""
	storage_client=storage.Client()
	bucket=storage_client.get_bucket(bucket_name)
	blob=bucket.blob(source_blob_name)

	blob.download_to_filename(destination_file_name)

	print('Blob {} downloaded to {}.'.format(
	source_blob_name,
	destination_file_name))

	defblob_commands(args):
	ifargs.command=='download':
	download_blob(
	args.bucket_name,
	args.source_blob_name,
	args.destination_file_name)

	defmain():
	parser=argparse.ArgumentParser(
	formatter_class=argparse.RawDescriptionHelpFormatter)

	subparsers=parser.add_subparsers(dest='command')

	download_parser=subparsers.add_parser(
	'download', help=download_blob.__doc__)
	download_parser.add_argument(
	'bucket_name', help='Your cloud storage bucket.')
	download_parser.add_argument('source_blob_name')
	download_parser.add_argument('destination_file_name')

	args=parser.parse_args()
	blob_commands(args)

	if__name__=='__main__':
	main()