Add file.filesizes to recipe engine core modules.

recipe_modules/file/resources/fileutil.py

 #!/usr/bin/env python
 # Copyright 2017 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Utility exporting basic filesystem operations.
 
 This file was cut from "scripts/common/chromium_utils.py" at:
 91310531c31fa645256b4fb5d44b460c42b3e151
 """
@@ skipping 232 matching lines @@
     func=lambda opts: print('\n'.join(sorted(os.listdir(opts.source)))))
 
   # Subcommand: ensure-directory
   subparser = subparsers.add_parser('ensure-directory',
       help='Ensures that the given path is a directory.')
   subparser.add_argument('--mode', help='The octal mode of the directory.',
                          type=lambda s: int(s, 8))
   subparser.add_argument('dest', help='The dir to ensure.')
   subparser.set_defaults(func=lambda opts: _EnsureDir(opts.mode, opts.dest))
 
+  # Subcommand: filesizes
+  subparser = subparsers.add_parser('filesizes',
+      help='Prints a list for sizes in bytes (1 per line) for each given file')
+  subparser.add_argument('file', nargs='+', help='Path to a file')
+  subparser.set_defaults(
+      func=lambda opts: print('\n'.join(str(os.stat(f).st_size)
+                                            for f in opts.file)))
+
   # Parse arguments.
   opts = parser.parse_args(args)
 
   # Actually do the thing.
   data = {
     'ok': False,
     'errno_name': '',
     'message': '',
   }
   try:
     opts.func(opts)
     data['ok'] = True
   except OSError as e:
     data['errno_name'] = errno.errorcode[e.errno]
     data['message'] = str(e)
   except shutil.Error as e:
     data['message'] = e.message
   except Exception as e:
     data['message'] = 'UNKNOWN: %s' % e
 
   with opts.json_output:
     json.dump(data, opts.json_output)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))