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-rw-r--r--nixos/modules/services/desktops/pipewire/wireplumber.nix183
1 files changed, 159 insertions, 24 deletions
diff --git a/nixos/modules/services/desktops/pipewire/wireplumber.nix b/nixos/modules/services/desktops/pipewire/wireplumber.nix
index 6ab62eb03c25f..c924801bcd8ba 100644
--- a/nixos/modules/services/desktops/pipewire/wireplumber.nix
+++ b/nixos/modules/services/desktops/pipewire/wireplumber.nix
@@ -1,18 +1,40 @@
 { config, lib, pkgs, ... }:
 
 let
-  inherit (builtins) attrNames concatMap length;
+  inherit (builtins) concatMap;
   inherit (lib) maintainers;
-  inherit (lib.attrsets) attrByPath filterAttrs;
+  inherit (lib.attrsets) attrByPath mapAttrsToList;
   inherit (lib.lists) flatten optional;
   inherit (lib.modules) mkIf;
   inherit (lib.options) literalExpression mkOption;
-  inherit (lib.strings) hasPrefix;
-  inherit (lib.types) bool listOf package;
+  inherit (lib.strings) concatStringsSep makeSearchPath;
+  inherit (lib.types) bool listOf attrsOf package lines;
+  inherit (lib.path) subpath;
 
   pwCfg = config.services.pipewire;
   cfg = pwCfg.wireplumber;
   pwUsedForAudio = pwCfg.audio.enable;
+
+  json = pkgs.formats.json { };
+
+  configSectionsToConfFile = path: value:
+    pkgs.writeTextDir
+      path
+      (concatStringsSep "\n" (
+        mapAttrsToList
+          (section: content: "${section} = " + (builtins.toJSON content))
+          value
+      ));
+
+  mapConfigToFiles = config:
+    mapAttrsToList
+      (name: value: configSectionsToConfFile "share/wireplumber/wireplumber.conf.d/${name}.conf" value)
+      config;
+
+  mapScriptsToFiles = scripts:
+    mapAttrsToList
+      (relativePath: value: pkgs.writeTextDir (subpath.join ["share/wireplumber/scripts" relativePath]) value)
+      scripts;
 in
 {
   meta.maintainers = [ maintainers.k900 ];
@@ -33,6 +55,114 @@ in
         description = "The WirePlumber derivation to use.";
       };
 
+      extraConfig = mkOption {
+        # Two layer attrset is necessary before using JSON, because of the whole
+        # config file not being a JSON object, but a concatenation of JSON objects
+        # in sections.
+        type = attrsOf (attrsOf json.type);
+        default = { };
+        example = literalExpression ''{
+          "log-level-debug" = {
+            "context.properties" = {
+              # Output Debug log messages as opposed to only the default level (Notice)
+              "log.level" = "D";
+            };
+          };
+          "wh-1000xm3-ldac-hq" = {
+            "monitor.bluez.rules" = [
+              {
+                matches = [
+                  {
+                    # Match any bluetooth device with ids equal to that of a WH-1000XM3
+                    "device.name" = "~bluez_card.*";
+                    "device.product.id" = "0x0cd3";
+                    "device.vendor.id" = "usb:054c";
+                  }
+                ];
+                actions = {
+                  update-props = {
+                    # Set quality to high quality instead of the default of auto
+                    "bluez5.a2dp.ldac.quality" = "hq";
+                  };
+                };
+              }
+            ];
+          };
+        }'';
+        description = ''
+          Additional configuration for the WirePlumber daemon when run in
+          single-instance mode (the default in nixpkgs and currently the only
+          supported way to run WirePlumber configured via `extraConfig`).
+
+          See also:
+          - [The configuration file][docs-the-conf-file]
+          - [Modifying configuration][docs-modifying-config]
+          - [Locations of files][docs-file-locations]
+          - and the [configuration section][docs-config-section] of the docs in general
+
+          Note that WirePlumber (and PipeWire) use dotted attribute names like
+          `device.product.id`. These are not nested, but flat objects for WirePlumber/PipeWire,
+          so to write these in nix expressions, remember to quote them like `"device.product.id"`.
+          Have a look at the example for this.
+
+          [docs-the-conf-file]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/conf_file.html
+          [docs-modifying-config]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/modifying_configuration.html
+          [docs-file-locations]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/locations.html
+          [docs-config-section]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration.html
+        '';
+      };
+
+      extraScripts = mkOption {
+        type = attrsOf lines;
+        default = { };
+        example = {
+          "test/hello-world.lua" = ''
+            print("Hello, world!")
+          '';
+        };
+        description = ''
+          Additional scripts for WirePlumber to be used by configuration files.
+
+          Every item in this attrset becomes a separate lua file with the path
+          relative to the `scripts` directory specified in the name of the item.
+          The scripts get passed to the WirePlumber service via the `XDG_DATA_DIRS`
+          variable. Scripts specified here are preferred over those shipped with
+          WirePlumber if they occupy the same relative path.
+
+          For a script to be loaded, it needs to be specified as part of a component,
+          and that component needs to be required by an active profile (e.g. `main`).
+          Components can be defined in config files either via `extraConfig` or `configPackages`.
+
+          For the hello-world example, you'd have to add the following `extraConfig`:
+          ```nix
+            services.pipewire.wireplumber.extraConfig."99-hello-world" = {
+              "wireplumber.components" = [
+                {
+                  name = "test/hello-world.lua";
+                  type = "script/lua";
+                  provides = "custom.hello-world";
+                }
+              ];
+
+              "wireplumber.profiles" = {
+                main = {
+                  "custom.hello-world" = "required";
+                };
+              };
+            };
+          ```
+
+          See also:
+          - [Location of scripts][docs-file-locations-scripts]
+          - [Components & Profiles][docs-components-profiles]
+          - [Migration - Loading custom scripts][docs-migration-loading-custom-scripts]
+
+          [docs-file-locations-scripts]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/locations.html#location-of-scripts
+          [docs-components-profiles]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/components_and_profiles.html
+          [docs-migration-loading-custom-scripts]: https://pipewire.pages.freedesktop.org/wireplumber/daemon/configuration/migration.html#loading-custom-scripts
+        '';
+      };
+
       configPackages = mkOption {
         type = listOf package;
         default = [ ];
@@ -57,7 +187,7 @@ in
 
       extraLv2Packages = mkOption {
         type = listOf package;
-        default = [];
+        default = [ ];
         example = literalExpression "[ pkgs.lsp-plugins ]";
         description = ''
           List of packages that provide LV2 plugins in `lib/lv2` that should
@@ -96,9 +226,22 @@ in
         }
       '';
 
+      extraConfigPkg = pkgs.buildEnv {
+        name = "wireplumber-extra-config";
+        paths = mapConfigToFiles cfg.extraConfig;
+        pathsToLink = [ "/share/wireplumber/wireplumber.conf.d" ];
+      };
+
+      extraScriptsPkg = pkgs.buildEnv {
+        name = "wireplumber-extra-scrips";
+        paths = mapScriptsToFiles cfg.extraScripts;
+        pathsToLink = [ "/share/wireplumber/scripts" ];
+      };
+
       configPackages = cfg.configPackages
-          ++ optional (!pwUsedForAudio) pwNotForAudioConfigPkg
-          ++ optional pwCfg.systemWide systemwideConfigPkg;
+        ++ [ extraConfigPkg extraScriptsPkg ]
+        ++ optional (!pwUsedForAudio) pwNotForAudioConfigPkg
+        ++ optional pwCfg.systemWide systemwideConfigPkg;
 
       configs = pkgs.buildEnv {
         name = "wireplumber-configs";
@@ -110,7 +253,7 @@ in
         (
           concatMap
             (p:
-              attrByPath ["passthru" "requiredLv2Packages"] [] p
+              attrByPath [ "passthru" "requiredLv2Packages" ] [ ] p
             )
             configPackages
         );
@@ -127,24 +270,10 @@ in
           assertion = !config.hardware.bluetooth.hsphfpd.enable;
           message = "Using WirePlumber conflicts with hsphfpd, as it provides the same functionality. `hardware.bluetooth.hsphfpd.enable` needs be set to false";
         }
-        {
-          assertion = length
-            (attrNames
-              (
-                filterAttrs
-                  (name: value:
-                    hasPrefix "wireplumber/" name || name == "wireplumber"
-                  )
-                  config.environment.etc
-              )) == 1;
-          message = "Using `environment.etc.\"wireplumber<...>\"` directly is no longer supported in 24.05. Use `services.pipewire.wireplumber.configPackages` instead.";
-        }
       ];
 
       environment.systemPackages = [ cfg.package ];
 
-      environment.etc.wireplumber.source = "${configs}/share/wireplumber";
-
       systemd.packages = [ cfg.package ];
 
       systemd.services.wireplumber.enable = pwCfg.systemWide;
@@ -156,10 +285,16 @@ in
       systemd.services.wireplumber.environment = mkIf pwCfg.systemWide {
         # Force WirePlumber to use system dbus.
         DBUS_SESSION_BUS_ADDRESS = "unix:path=/run/dbus/system_bus_socket";
+
+        # Make WirePlumber find our config/script files and lv2 plugins required by those
+        # (but also the configs/scripts shipped with WirePlumber)
+        XDG_DATA_DIRS = makeSearchPath "share" [ configs cfg.package ];
         LV2_PATH = "${lv2Plugins}/lib/lv2";
       };
 
-      systemd.user.services.wireplumber.environment.LV2_PATH =
-        mkIf (!pwCfg.systemWide) "${lv2Plugins}/lib/lv2";
+      systemd.user.services.wireplumber.environment = mkIf (!pwCfg.systemWide) {
+        XDG_DATA_DIRS = makeSearchPath "share" [ configs cfg.package ];
+        LV2_PATH = "${lv2Plugins}/lib/lv2";
+      };
     };
 }