custom/trivmix-service.nix


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{ name
, run ? null
, connectOut ? null
, connectIn ? null
, trivmix
, stdenv
, makeWrapper
, jack2
}:

let
  genRun = if ! isNull run then run else (
    "${derivRun}/run.sh"
  );
  derivRun = stdenv.mkDerivation {
    name = "trivmix-run";
    src = ''
      #!/bin/sh

      ${if ! isNull connectIn then "jack_connect ${connectIn} $1" else ""}
      ${if ! isNull connectOut then "jack_connect $2 ${connectOut}" else ""}
    '';
    unpackPhase = "cat";
    buildInputs = [ makeWrapper ];
    buildPhase = ''
      mkdir -p $out/bin
      cp $src $out/bin/run.sh
      chmod 755 $out/bin/run.sh
      wrapProgram $out/bin/run.sh \
        --prefix PATH : ${jack2}/bin
    '';
  };
in {
  wantedBy = [ "sound.target" ];
  requires = [ "jack.service" ];
  serviceConfig = {
    Type = "simple";
    ExecStart = "${trivmix} --client ${name} --run ${genRun} --dir /run/${name}";
    User = "jack";
    Group = "audio";
  };
}