nixos/pulseaudio: make daemon.conf configurable (#20888)

This adds pulseaudio.daemon.config, which is a set of keys to values
which are directly translated to keys and values of pulseaudio's
daemon.conf, e. g.

    hardware.pulseaudio.daemon.config = { flat-volumes = "no"; }

becomes

    flat-volumes=no

in pulse/daemon.conf.

1 files changed, 14 insertions, 4 deletions

diff --git a/nixos/modules/config/pulseaudio.nix b/nixos/modules/config/pulseaudio.nix
index 742167fbf69..d5cb4fce0f9 100644
--- a/nixos/modules/config/pulseaudio.nix
+++ b/nixos/modules/config/pulseaudio.nix
@@ -160,6 +160,13 @@ in {
             if activated.
           '';
         };
+
+        config = mkOption {
+          type = types.attrsOf types.unspecified;
+          default = {};
+          description = ''Config of the pulse daemon. See <literal>man pulse-daemon.conf</literal>.'';
+          example = literalExample ''{ flat-volumes = "no"; }'';
+        };
       };
 
       zeroconf = {
@@ -204,10 +211,13 @@ in {
     (mkIf cfg.enable {
       environment.systemPackages = [ overriddenPackage ];
 
-      environment.etc = singleton {
-        target = "asound.conf";
-        source = alsaConf;
-      };
+      environment.etc = [
+        { target = "asound.conf";
+          source = alsaConf; }
+
+        { target = "pulse/daemon.conf";
+          source = writeText "daemon.conf" (lib.generators.toKeyValue {} cfg.daemon.config); }
+      ];
 
       # Allow PulseAudio to get realtime priority using rtkit.
       security.rtkit.enable = true;