lib.filesystem: remove Nix 2.14 shim (#450408)

    :::

  */

  pathType =

    builtins.readFileType or

    # Nix <2.14 compatibility shim

    (

      path:

      if

        !pathExists path

      # Fail irrecoverably to mimic the historic behavior of this function and

      # the new builtins.readFileType

      then

        abort "lib.filesystem.pathType: Path ${toString path} does not exist."

      # The filesystem root is the only path where `dirOf / == /` and

      # `baseNameOf /` is not valid. We can detect this and directly return

      # "directory", since we know the filesystem root can't be anything else.

      else if dirOf path == path then

        "directory"

      else

        (readDir (dirOf path)).${baseNameOf path}

    );

  pathType = builtins.readFileType;

  /**

    Whether a path exists and is a directory.