def _ImageFileForChroot(chroot):
  """Find the image file that should be associated with |chroot|.

  This function does not check if the image exists; it simply returns the
  filename that would be used.

  Args:
    chroot: Path to the chroot.

  Returns:
    Path to an image file that would be associated with chroot.
  """
  return chroot.rstrip('/') + '.img'