def CanonicalPathToLocalPath(path):
  r"""Converts the canonical paths as used by GRR to OS specific paths.

  Due to the inconsistencies between handling paths in windows we need to
  convert a path to an OS specific version prior to using it. This function
  should be called just before any OS specific functions.

  Canonical paths on windows have:
    - / instead of \.
    - Begin with /X:// where X is the drive letter.

  Args:
    path: A canonical path specification.

  Returns:
    A windows specific path.
  """
  # Account for raw devices
  path = path.replace("/\\", "\\")
  path = path.replace("/", "\\")
  m = re.match(r"\\([a-zA-Z]):(.*)$", path)
  if m:
    path = "%s:\\%s" % (m.group(1), m.group(2).lstrip("\\"))

  return path