nix: add flake with vhost-device-sound package

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1773628058,
+        "narHash": "sha256-hpXH0z3K9xv0fHaje136KY872VT2T5uwxtezlAskQgY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f8573b9c935cfaa162dd62cc9e75ae2db86f85df",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,22 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs [
+          "x86_64-linux"
+          "aarch64-linux"
+        ] (system: f nixpkgs.legacyPackages.${system});
+    in
+    {
+      packages = forAllSystems (pkgs: {
+        vhost-device-sound = pkgs.callPackage ./packages/vhost-device-sound.nix { };
+        default = pkgs.callPackage ./packages/vhost-device-sound.nix { };
+      });
+    };
+}

packages/vhost-device-sound.nix

@@ -0,0 +1,47 @@
+{
+  lib,
+  rustPlatform,
+  pkg-config,
+  pipewire,
+}:
+
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "vhost-device-sound";
+  version = "0.3.0";
+
+  src = lib.cleanSource ./..;
+
+  cargoHash = "sha256-mw0zOCOOT2LmFUGzC4n3YES6R7eaofMsaSYWJpLooAM=";
+
+  nativeBuildInputs = [
+    pkg-config
+    rustPlatform.bindgenHook
+  ];
+  buildInputs = [
+    pipewire
+  ];
+
+  cargoBuildFlags = [
+    "--package"
+    "vhost-device-sound"
+  ];
+  cargoTestFlags = [
+    "--package"
+    "vhost-device-sound"
+  ];
+
+  buildNoDefaultFeatures = true;
+  buildFeatures = [ "pw-backend" ];
+
+  doCheck = false;
+
+  meta = {
+    homepage = "https://git.dsg.is/dsg/vhost-device";
+    description = "virtio-sound device using the vhost-user protocol (vmsilo fork)";
+    license = [
+      lib.licenses.asl20
+      lib.licenses.bsd3
+    ];
+    platforms = lib.platforms.linux;
+  };
+})