import os
import sys

def include_bucklets(names):
  d = os.getcwd()
  while not os.path.lexists(os.path.join(d, '.buckversion')):
    d = os.path.dirname(d)

  bd = os.path.join(d, 'bucklets')
  if not os.path.isdir(bd) or not os.listdir(bd):
    sys.stderr.write(('Bucklets directory is missing or empty: %s\n'
                      'Run `git submodule update --init`') % bd)
    sys.exit(1)

  for name in names:
    path = os.path.join(bd, name)
    if not os.path.isfile(path):
      sys.stderr.write('Missing bucklet: %s\n' % path)
      sys.exit(1)
    include_defs('//bucklets/%s' % name)