#!/usr/bin/env python
# Copyright (c) 2013 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.

# This scripts generates a manifest file for the MountHttp file system.
# Files and directory paths are specified on the command-line.  The names
# with glob and directories are recursed to form a list of files.
#
# For each file, the mode bits, size and path relative to the CWD are written
# to the output file which is stdout by default.
#

import glob
import optparse
import os
import sys


def main(argv):
  parser = optparse.OptionParser(
      usage='Usage: %prog [options] filename ...')
  parser.add_option('-C', '--srcdir',
                    help='Change directory.', dest='srcdir', default=None)
  parser.add_option('-o', '--output',
                    help='Output file name.', dest='output', default=None)
  parser.add_option('-v', '--verbose',
                    help='Verbose output.',  dest='verbose',
                    action='store_true')
  parser.add_option('-r', '--recursive',
                    help='Recursive search.', action='store_true')
  options, args = parser.parse_args(argv)

  if options.output:
    outfile = open(options.output, 'w')
  else:
    outfile = sys.stdout

  if options.srcdir:
    os.chdir(options.srcdir)

  # Generate a set of unique file names bases on the input globs
  fileset = set()
  for fileglob in args:
    filelist = glob.glob(fileglob)
    if not filelist:
      raise RuntimeError('Could not find match for "%s".\n' % fileglob)
    for filename in filelist:
      if os.path.isfile(filename):
        fileset |= set([filename])
        continue
      if os.path.isdir(filename) and options.recursive:
        for root, _, files in os.walk(filename):
          fileset |= set([os.path.join(root, name) for name in files])
        continue
      raise RuntimeError('Can not handle path "%s".\n' % filename)

  cwd = os.path.abspath(os.getcwd())
  cwdlen = len(cwd)
  for filename in sorted(fileset):
    relname = os.path.abspath(filename)
    if cwd not in relname:
      raise RuntimeError('%s is not relative to CWD %s.\n' % filename, cwd)
    relname = relname[cwdlen:]
    stat = os.stat(filename)
    mode = '-r--'
    outfile.write('%s %d %s\n' % (mode, stat.st_size, relname))

  return 0


if __name__ == '__main__':
  try:
    sys.exit(main(sys.argv[1:]))
  except OSError, e:
    sys.stderr.write('%s: %s\n' % (os.path.basename(__file__), e))
    sys.exit(1)