Package for Nix

[gabyx]

I would love to package this to Nix,
but I am unsure what this repo needs to build. Its a cmake project I guess. Do you know what requirements are needed to build the desktop app on another linux distro?

Help appreciated.

[gabyx]

When I run it with the following Nix shell which puts some libraries into the shell etc etc:

with import <nixpkgs> { };
mkShell {
  NIX_LD_LIBRARY_PATH = lib.makeLibraryPath [
    pkgs.stdenv.cc.cc
    pkgs.alsa-lib-with-plugins
    pkgs.qt5.qtbase
    pkgs.qt5.qtwayland

    pkgs.dbus
    pkgs.pipewire
    pkgs.jack2

    pkgs.pipewire.jack
    "/home/nixos/.local/share/chezmoi/tests/mod-desktop-0.0.12-linux-x86_64/mod-desktop/jack"
  ];

  QT_PLUGIN_PATH = "${qt5.qtbase}/${qt5.qtbase.qtPluginPrefix}:${qt5.qtwayland.bin}/${qt5.qtbase.qtPluginPrefix}";
  QML2_IMPORT_PATH = "${qt5.qtdeclarative}/${qt5.qtbase.qtQmlPrefix}:${qt5.qtwayland.bin}/${qt5.qtbase.qtQmlPrefix}";

  NIX_LD = lib.fileContents "${stdenv.cc}/nix-support/dynamic-linker";
}

The application downloaded from the release page starts, and
I can start it on my M-Track USB Audio interface:

Starting jackd using:
-R -S -n mod-desktop -C ./jack/jack-session-alsamidi.conf -v -d alsa -r 48000 -p 256 -d hw:2,0
jackdmp 1.9.22
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2016 Grame.
Copyright 2016-2023 Filipe Coelho.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
self-connect-mode is "Don't restrict self connect requests"
Jack: JackPosixThread::StartImp : create non RT thread
Jack: JackPosixThread::ThreadHandler : start
Jack: playback device hw:2,0
Jack: capture device hw:2,0
Jack: apparent rate = 48000
Jack: frames per period = 256
Jack: JackDriver::Open capture_driver_name = hw:2,0
Jack: JackDriver::Open playback_driver_name = hw:2,0
Jack: Check protocol client = 9 server = 9
Jack: JackEngine::ClientInternalOpen: name = system
Jack: JackEngine::AllocateRefNum ref = 0
Jack: JackLinuxFutex::Allocate name = jack_sem.1000_mod-desktop_system val = 0
Jack: JackEngine::NotifyAddClient: name = system
Jack: JackGraphManager::SetBufferSize size = 256
Jack: JackConnectionManager::DirectConnect first: ref1 = 0 ref2 = 0
Jack: JackGraphManager::ConnectRefNum cur_index = 0 ref1 = 0 ref2 = 0
Jack: JackDriver::SetupDriverSync driver sem in normal mode
audio_reservation_init
Acquire audio card Audio2
creating alsa driver ... hw:2,0|hw:2,0|256|2|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 256 frames (5.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 24bit little-endian in 3bytes format
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 24bit little-endian in 3bytes format
ALSA: use 2 periods for playback
Jack: JackPosixThread::StartImp : create non RT thread
Jack: JackSocketServerChannel::Open
Jack: JackServerSocket::Bind : addr.sun_path /dev/shm/jack_mod-desktop_1000_0
Jack: JackSocketServerChannel::BuildPoolTable size = 1
Jack: JackEngine::Open
Jack: JackClientSocket::Connect : addr.sun_path /dev/shm/jack_mod-desktop_1000_0
Jack: JackEngine::ClientInternalOpen: name = freewheel
Jack: JackEngine::AllocateRefNum ref = 1
Jack: JackLinuxFutex::Allocate name = jack_sem.1000_mod-desktop_freewheel val = 0
Jack: JackEngine::NotifyAddClient: name = freewheel
Jack: JackDriver::ClientNotify ref = 1 driver = system name = freewheel notify = 0
Jack: JackDriver::ClientNotify ref = 0 driver = freewheel name = system notify = 0
Jack: JackConnectionManager::DirectConnect first: ref1 = 1 ref2 = 1
Jack: JackGraphManager::ConnectRefNum cur_index = 0 ref1 = 1 ref2 = 1
Jack: JackDriver::SetupDriverSync driver sem in normal mode
Jack: JackGraphManager::SetBufferSize size = 256
Jack: JackAlsaDriver::Attach fBufferSize 256 fSampleRate 48000
Jack: JackEngine::PortRegister ref = 0 name = system:capture_1 type = 32 bit float mono audio flags = 22 buffer_size = 256
Jack: JackGraphManager::AllocatePortAux port_index = 1 name = system:capture_1 type = 32 bit float mono audio
Jack: JackConnectionManager::AddOutputPort ref = 0 port = 1
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackAlsaDriver::Attach fCapturePortList[i] 1 
Jack: JackEngine::PortRegister ref = 0 name = system:capture_2 type = 32 bit float mono audio flags = 22 buffer_size = 256
Jack: JackGraphManager::AllocatePortAux port_index = 2 name = system:capture_2 type = 32 bit float mono audio
Jack: JackConnectionManager::AddOutputPort ref = 0 port = 2
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackAlsaDriver::Attach fCapturePortList[i] 2 
Jack: JackEngine::PortRegister ref = 0 name = system:playback_1 type = 32 bit float mono audio flags = 21 buffer_size = 256
Jack: JackGraphManager::AllocatePortAux port_index = 3 name = system:playback_1 type = 32 bit float mono audio
Jack: JackConnectionManager::AddInputPort ref = 0 port = 3
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackAlsaDriver::Attach fPlaybackPortList[i] 3 
Jack: JackEngine::PortRegister ref = 0 name = system:playback_2 type = 32 bit float mono audio flags = 21 buffer_size = 256
Jack: JackGraphManager::AllocatePortAux port_index = 4 name = system:playback_2 type = 32 bit float mono audio
Jack: JackConnectionManager::AddInputPort ref = 0 port = 4
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackEngine::ClientNotify: no callback for notification = 9
Jack: JackAlsaDriver::Attach fPlaybackPortList[i] 4 
Jack: Clock source : system clock via clock_gettime
Jack: JackServer::Start
Jack: JackThreadedDriver::Start
Jack: JackPosixThread::StartImp : create non RT thread
Jack: JackPosixThread::ThreadHandler : start
Jack: JackThreadedDriver::Init real-time
Jack: JackPosixThread::AcquireRealTimeImp priority = 10
Jack: JackPosixThread::StartImp : create non RT thread
Jack: JackPosixThread::ThreadHandler : start
Jack: JackSocketServerChannel::ClientCreate socket
Jack: JackSocketServerChannel::BuildPoolTable size = 2
Jack: JackSocketServerChannel::BuildPoolTable fSocketTable i = 1 fd = 12
Jack: JackLoadableInternalClient::JackLoadableInternalClient path_to_so = /home/nixos/.local/share/chezmoi/tests/mod-desktop-0.0.12-linux-x86_64/mod-desktop/jack/alsa_midi.so
Jack: No jack_get_descriptor entry-point for alsa_midi
Jack: JackInternalClient::Open name = system_midi
Jack: Check protocol client = 9 server = 9
Jack: JackEngine::ClientInternalOpen: name = system_midi
Jack: JackEngine::AllocateRefNum ref = 2
Jack: JackLinuxFutex::Allocate name = jack_sem.1000_mod-desktop_system_midi val = 0
Jack: JackPosixProcessSync::TimedWait time out = 5000000
JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Jack: JackPosixProcessSync::TimedWait finished delta = 5000096.0
Driver is not running
Cannot open client name = system_midi
Cannot load client system_midi from internal session file line 0. Ignoring the line!
Jack: JackLoadableInternalClient::JackLoadableInternalClient path_to_so = /home/nixos/.local/share/chezmoi/tests/mod-desktop-0.0.12-linux-x86_64/mod-desktop/jack/mod-midi-merger.so
Jack: No jack_get_descriptor entry-point for mod-midi-merger
Jack: JackInternalClient::Open name = mod-midi-merger
Jack: Check protocol client = 9 server = 9
Jack: JackEngine::ClientInternalOpen: name = mod-midi-merger
Jack: JackEngine::AllocateRefNum ref = 2
Jack: JackLinuxFutex::Allocate name = jack_sem.1000_mod-desktop_mod-midi-merger val = 0
Jack: JackPosixProcessSync::TimedWait time out = 5000000
ALSA: poll time out, polled for 8000271 usecs, Retrying with a recovery, retry cnt = 1
JackPosixProcessSync::LockedTimedWait error usec = 5000000 err = Connection timed out
Jack: JackPosixProcessSync::TimedWait finished delta = 5000083.0
Driver is not running
Cannot open client name = mod-midi-merger

I get somehow Jack: No jack_get_descriptor entry-point for mod-midi-merger
which I am not sure if this is a problem.

But it does not start. Anybody some ideas what might be wrong (I am on a preemptive linux kernel and rtcqs reports all fine):

╰─❯ rtcqs
rtcqs - version 0.6.2

Root User
=========
[ OK ] Not running as root.

Group Limits
============
[ OK ] User nixos is member of a group that has sufficient rtprio (99) and memlock (unlimited) limits set.

CPU Frequency Scaling
=====================
[ OK ] The scaling governor of all CPUs is set to performance.

Kernel Configuration
====================
[ OK ] Valid kernel configuration found.

High Resolution Timers
======================
[ OK ] High resolution timers are enabled.

Tickless Kernel
===============
[ OK ] System is using a tickless kernel.

Preempt RT
==========
[ OK ] Kernel 6.6.30-rt30 is using threaded IRQs.

Spectre/Meltdown Mitigations
============================
[ WARNING ] Kernel with Spectre/Meltdown mitigations found. This could have a negative impact on the performance of your system. See also https://wiki.linuxaudio.org/wiki/system_configuration#disabling_spectre_and_meltdown_mitigations

RT Priorities
=============
[ OK ] Realtime priorities can be set.

Swappiness
==========
[ OK ] Swappiness is set at 10.

Filesystems
===========
[ OK ] The following mounts can be used for audio purposes: /, /nix, /persist/etc, /var/log, /nix/store, /home, /persist, /swap
[ WARNING ] The following mounts should be avoided for audio purposes: /boot. See also https://wiki.linuxaudio.org/wiki/system_configuration#filesystems

IRQs
====
[ OK ] USB port xhci_hcd with IRQ 55 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 45 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 53 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 43 does not share its IRQ.
[ OK ] Soundcard snd_hda_intel:card0 with IRQ 114 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 51 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 41 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 58 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 48 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 56 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 46 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 54 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 44 does not share its IRQ.
[ OK ] Soundcard snd_hda_intel:card1 with IRQ 115 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 52 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 42 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 49 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 57 does not share its IRQ.
[ OK ] USB port xhci_hcd with IRQ 47 does not share its IRQ.

Power Management
================
[ OK ] Power management can be controlled from user space. This enables DAWs like Ardour and Reaper to set CPU DMA latency which could help prevent xruns.