From 780f766675be7ddab2523f69e23181052440b754 Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Wed, 24 Jul 2024 15:08:19 +0200
Subject: [PATCH] nixos/installer: ship only one mbrola voice per language

This reduces the size of mbrola-voices by 387M (647M -> 260M) for all
installers that ship with speechd, to make sure that they fit the output
limits of hydra while not compromising too much on accessbility.
---
 .../installer/cd-dvd/installation-cd-graphical-base.nix  | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix b/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix
index 4a00c52916f69..fff0407cf576f 100644
--- a/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix
+++ b/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix
@@ -66,4 +66,13 @@ with lib;
     glxinfo
   ];
 
+  nixpkgs.overlays = [
+    (self: super: {
+      mbrola-voices = super.mbrola-voices.override {
+        # only ship with one voice per language
+        languages = [ "*1" ];
+      };
+    })
+  ];
+
 }