fix typo and writing improvement

README.md

@@ -65,11 +65,11 @@ This is exactly what we're doing to set the default deployment user to `colmena-
 
 ## Build NixOS Proxmox VE Template
 
-Build a new NixOS Proxmox VE Template for the thinkcccore's:
+Build a new NixOS Proxmox VE Template for the thinkcccore's.
 ```shell
 nix build .#proxmox-nixos-template
 ```
-Build a new NixOS Proxmox VE Template for the chaosknoten:
+Build a new NixOS Proxmox VE Template for the chaosknoten.
 ```shell
 nix build .#proxmox-chaosknoten-nixos-template
 ```

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixlib": {
       "locked": {
-        "lastModified": 1729386149,
-        "narHash": "sha256-hUP9oxmnOmNnKcDOf5Y55HQ+NnoT0+bLWHLQWLLw9Ks=",
+        "lastModified": 1726966855,
+        "narHash": "sha256-25ByioeOBFcnitO5lM/Mufnv/u7YtHEHEM8QFuiS40k=",
         "owner": "nix-community",
         "repo": "nixpkgs.lib",
-        "rev": "cce4521b6df014e79a7b7afc58c703ed683c916e",
+        "rev": "575704ff85d3a41dc5bfef7b55380cbc7b87f3c2",
         "type": "github"
       },
       "original": {
@@ -23,11 +23,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729472750,
-        "narHash": "sha256-s93LPHi5BN7I2xSGNAFWiYb8WRsPvT1LE9ZjZBrpFlg=",
+        "lastModified": 1727053438,
+        "narHash": "sha256-t/+z1Tf7hSaStU1pBYkY7i0/GkG+YIPSmfeRrK8eYUw=",
         "owner": "nix-community",
         "repo": "nixos-generators",
-        "rev": "7c60ba4bc8d6aa2ba3e5b0f6ceb9fc07bc261565",
+        "rev": "e8c1cd886cc17e31e424f915efd32e84d8af0ce9",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1730428893,
-        "narHash": "sha256-fLLUd2dO/Vnf96UDr8YPzerYi+n99l3S5yIUDnmcPBE=",
+        "lastModified": 1727076372,
+        "narHash": "sha256-gXIWudYhY/4LjQPvrGn9lN4fbHjw/mf1mb9KKJK//4I=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "38edd08881ce4dc24056eec173b43587a93c990f",
+        "rev": "7ca0f93c530406c1610defff0b9bf643333cf992",
         "type": "github"
       },
       "original": {
@@ -54,11 +54,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1729973466,
-        "narHash": "sha256-knnVBGfTCZlQgxY1SgH0vn2OyehH9ykfF8geZgS95bk=",
+        "lastModified": 1725762081,
+        "narHash": "sha256-vNv+aJUW5/YurRy1ocfvs4q/48yVESwlC/yHzjkZSP8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cd3e8833d70618c4eea8df06f95b364b016d4950",
+        "rev": "dc454045f5b5d814e5862a6d057e7bb5c29edc05",
         "type": "github"
       },
       "original": {
@@ -70,11 +70,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1730449684,
-        "narHash": "sha256-Hlv3rTPxnO+DpKRXw9yjzERLdk05h7+fEbZxWM2taCw=",
+        "lastModified": 1727104955,
+        "narHash": "sha256-m6kgjR4zAwyMe1Pn4RGXLCzArtoBp1qzhb2AUlPeVh4=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "ab464abbeb3a2833288c6e907488c49c2e599f88",
+        "rev": "d266adc5a77ec8c10ed941c7251b2673004dbd62",
         "type": "github"
       },
       "original": {
@@ -100,11 +100,11 @@
         "nixpkgs-stable": "nixpkgs-stable"
       },
       "locked": {
-        "lastModified": 1729999681,
-        "narHash": "sha256-qm0uCtM9bg97LeJTKQ8dqV/FvqRN+ompyW4GIJruLuw=",
+        "lastModified": 1726524647,
+        "narHash": "sha256-qis6BtOOBBEAfUl7FMHqqTwRLB61OL5OFzIsOmRz2J4=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "1666d16426abe79af5c47b7c0efa82fd31bf4c56",
+        "rev": "e2d404a7ea599a013189aa42947f66cede0645c8",
         "type": "github"
       },
       "original": {

flake.nix

@@ -26,18 +26,50 @@
   outputs = { self, nixpkgs, nixpkgs-unstable, nixos-generators, sops-nix, ... }:
     let
       system = "x86_64-linux";
+      # Shairport Sync 4.3.1 (with nqptp 1.2.4) with metadata, MQTT and AirPlay 2 support.
       shairportSync431ExtendedNixpkgsUnstableOverlay = final: prev: {
         shairport-sync = (prev.shairport-sync.override { enableMetadata = true; enableAirplay2 = true; }).overrideAttrs (finalAttr: previousAttr: {
           # See: https://github.com/mikebrady/shairport-sync/blob/e78a88b64adfe7b5f88fd6faedf55c57445bb240/CONFIGURATION%20FLAGS.md
           configureFlags = previousAttr.configureFlags ++ [ "--with-mqtt-client" ];
           buildInputs = previousAttr.buildInputs ++ [ final.mosquitto ];
+          # Use specific Shairport Sync and nqptp versions, since with those the
+          # following error doesn't happen:
+          # fatal error: The nqptp service on this system, which is required for
+          # Shairport Sync to operate, does not seem to be initialised.
+          #
+          # Also use a more recent dev version to fix Pipewire stuttering issue.
+          # See:
+          # https://github.com/mikebrady/shairport-sync/issues/1736
+          # https://github.com/mikebrady/shairport-sync/blob/a65ec2d7f1f380bbae196d7f8f1cd6a88ef5777b/RELEASENOTES-DEVELOPMENT.md#version-432-dev-51-g98679bbb
+          src = final.fetchFromGitHub {
+            owner = "mikebrady";
+            repo = finalAttr.pname;
+            rev = "98679bbb54f5aaeda859e34aa28425647b8d179e";
+            hash = "sha256-k0kcgtWk2xlG34lP0ryEaqdskYMNM68YnIRLwFR3jaY=";
+          };
+        });
+        nqptp = prev.nqptp.overrideAttrs (finalAttr: previousAttr: {
+          # See Shairport Sync version note.
+          src = final.fetchFromGitHub {
+            owner = "mikebrady";
+            repo = finalAttr.pname;
+            rev = "1.2.4";
+            hash = "sha256-roTNcr3v2kzE6vQ5plAVtlw1+2yJplltOYsGGibtoZo=";
+          };
+          # Custom install phase to avoid setcap.
+          # See:
+          # https://github.com/mikebrady/nqptp/blob/1.2.4/Makefile.am#L23
+          installPhase = ''
+            mkdir -p $out/bin
+            cp nqptp $out/bin/
+          '';
         });
       };
       pkgs-unstable = nixpkgs-unstable.legacyPackages."x86_64-linux";
     in
     {
       nixosConfigurations = {
-        audio-hauptraum-kueche = nixpkgs.lib.nixosSystem {
+        audio-hauptraum-kueche = nixpkgs-unstable.lib.nixosSystem {
           inherit system;
           modules = [
             ./config/common
@@ -47,7 +79,7 @@
           ];
         };
 
-        audio-hauptraum-tafel = nixpkgs.lib.nixosSystem {
+        audio-hauptraum-tafel = nixpkgs-unstable.lib.nixosSystem {
           inherit system;
           modules = [
             ./config/common

modules/services/audio/default.nix

@@ -12,6 +12,7 @@ in
   imports = [
     ./librespot.nix
     ./mpd.nix
+    ./networking.nix
     ./pipewire.nix
     ./shairport-sync.nix
   ];

modules/services/audio/librespot.nix

@@ -23,7 +23,7 @@ in
         After = [ "network-online.target" "pipewire.service" ];
       };
       serviceConfig = {
-        ExecStart = "${pkgs.librespot}/bin/librespot --name '${config.ccchh.services.audio.name}' --device-type speaker --bitrate 320 --enable-volume-normalisation --disable-audio-cache --disable-credential-cache";
+        ExecStart = "${pkgs.librespot}/bin/librespot --name '${config.ccchh.services.audio.name}' --device-type speaker --bitrate 320 --enable-volume-normalisation --disable-audio-cache --disable-credential-cache --quiet";
         User = "librespot";
         Group = "librespot";
       };
@@ -34,7 +34,7 @@ in
       users.librespot = {
         isSystemUser = true;
         group = "librespot";
-        extraGroups = [ "pipewire" "audio" ];
+        extraGroups = [ "pipewire" ];
       };
       groups.librespot = { };
     };

modules/services/audio/networking.nix

@@ -0,0 +1,16 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+
+  cfg = config.ccchh.services.audio;
+
+in
+
+{
+  config = mkIf cfg.enable {
+    # Disable IPv6, since Shairport-Sync doesn't work with IPv6. Unclear why.
+    networking.enableIPv6 = false;
+  };
+}

modules/services/audio/shairport-sync.nix

@@ -20,7 +20,7 @@ in
       arguments = "-o pw -v";
     };
 
-    users.users.shairport.extraGroups = [ "pipewire" "audio" ];
+    users.users.shairport.extraGroups = [ "pipewire" ];
 
     environment.etc.shairport-sync-config = {
       enable = true;