def copy_file()

in setup.py [0:0]
51 lines of code
16 McCabe index (conditional complexity)

  def copy_file(self, src, dst, preserve_mode=1, preserve_times=1,
                link=None, level=1):
    name, actor = self.actor(src, dst)
    if actor:
      if not os.path.isfile(src):
        raise DistutilsFileError("can't copy '%s': doesn't exist or not a regular file" % src)

      if os.path.isdir(dst):
        dir = dst
        dst = os.path.join(dst, os.path.basename(src))
      else:
        dir = os.path.dirname(dst)

      if not self.force and not newer(src, dst):
        return dst, 0

      if os.path.basename(dst) == os.path.basename(src):
        log.info("%s %s -> %s", name, src, dir)
      else:
        log.info("%s %s -> %s", name, src, dst)

      if self.dry_run:
        return (dst, 1)
      else:
        try:
          fsrc = open(src, 'rb')
        except os.error as e:
          errno, errstr = e.args
          raise DistutilsFileError("could not open '%s': %s" % (src, errstr))

        if os.path.exists(dst):
          try:
            os.unlink(dst)
          except os.error as e:
            errno, errstr = e.args
            raise DistutilsFileError("could not delete '%s': %s" % (dst, errstr))

        try:
          fdst = open(dst, 'wb')
        except os.error as e:
          errno, errstr = e.args
          raise DistutilsFileError("could not create '%s': %s" % (dst, errstr))

        try:
          fdst.write(actor(fsrc.read()))
        finally:
          fsrc.close()
          fdst.close()

        if preserve_mode or preserve_times:
          st = os.stat(src)

          if preserve_times:
            os.utime(dst, (st[ST_ATIME], st[ST_MTIME]))
          if preserve_mode:
            os.chmod(dst, S_IMODE(st[ST_MODE]))

        return (dst, 1)
    else:
      return Command.copy_file(self, src, dst, preserve_mode, preserve_times,
                               link, level)