treewide: add defaultText for options with simple interpolation defaults

adds defaultText for all options that use `cfg.*` values in their
defaults, but only for interpolations with no extra processing (other
than toString where necessary)

1 files changed, 3 insertions, 1 deletions

diff --git a/nixos/modules/services/torrent/rtorrent.nix b/nixos/modules/services/torrent/rtorrent.nix
index dd7df623c73..759dcfe2e6c 100644
--- a/nixos/modules/services/torrent/rtorrent.nix
+++ b/nixos/modules/services/torrent/rtorrent.nix
@@ -1,10 +1,11 @@
-{ config, pkgs, lib, ... }:
+{ config, options, pkgs, lib, ... }:
 
 with lib;
 
 let
 
   cfg = config.services.rtorrent;
+  opt = options.services.rtorrent;
 
 in {
   options.services.rtorrent = {
@@ -21,6 +22,7 @@ in {
     downloadDir = mkOption {
       type = types.str;
       default = "${cfg.dataDir}/download";
+      defaultText = literalExpression ''"''${config.${opt.dataDir}}/download"'';
       description = ''
         Where to put downloaded files.
       '';