Argon One Fan and Button Configuration in NixOS

default.nix

{
  pkgs
, lib
, stdenv
, fetchurl

, bash
, python3
, wget
}:

let
  pythonEnv = python3.withPackages(ps: with ps; [
    rpi-gpio
    smbus-cffi
  ]);

in stdenv.mkDerivation rec {
  pname = "argonone-bin";
  version = "20191209";

  src = fetchurl {
    name = "argonone-src";
    url = "https://download.argon40.com/argon1.sh";
    downloadToTemp = true;
    recursiveHash = true;
    sha256 = "ZAeYt1k9KZJzL6lROi5BuyN6ZBhOdVxBjKC5r9D4Af4=";
    postFetch = ''
      install -D $downloadedFile $out/argon1.sh
    '';
  };

  nativeBuildInputs = [ bash wget ];
  buildInputs = [ python3 ];

  pkgdir = "${placeholder "out"}";

  patches = [
    ./nixos-support.patch
  ];
  prePatch = ''
    install -Dm775 $src/argon1.sh ./argon1.sh
  '';
  postPatch = ''
    patchShebangs ./argon1.sh
    substituteInPlace ./argon1.sh \
      --subst-var "pkgdir" \
      --replace "sudo " "" \
      --replace "wget" "${wget}/bin/wget" \
      --replace "/usr/bin/python3" "${pythonEnv}/bin/python3"
  '';
  # TODO: Fix `argonone-ir` binary: "wget: unable to resolve host address 'download.argon40.com'"

  dontUnpack = true;
  dontConfigure = true;
  dontBuild = true;

  installPhase = ''
    runHook preInstall

    mkdir -p \
      $pkgdir/bin \
      $pkgdir/etc \
      $pkgdir/usr/bin \
      $pkgdir/lib/systemd/system \
      $pkgdir/lib/systemd/system-shutdown
    ./argon1.sh

    ln -s $pkgdir/usr/bin/argononed.py $out/bin/argononed

    runHook postInstall
  '';

  meta = with lib; {
    description = "Argon One Fan and Button Configuration";
    homepage = "https://download.argon40.com/argon1.sh";
    maintainers = with maintainers; [ ];
    mainProgram = "argononed";
    platforms = [ "aarch64-linux" ];
  };
}

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1690952720,
        "narHash": "sha256-fPsiQHARfhVxXpWgcuSKvkYwSco8K13K7XevBpdIfPg=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "96112a3ed5d12bb1758b42c63b924c004b6c0bc9",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  description = "Argon One";

  outputs = { self, nixpkgs }: 
    let system = "aarch64-linux";
    pkgs = import nixpkgs { inherit system; };
  in {
    packages.${system}.argononed = pkgs.callPackage ./default.nix { inherit pkgs; };
  };
}

nixos-support.patch

diff --git a/argon1.sh b/argon1.sh
index 2b1c105..c1e9558 100644
--- a/argon1.sh
+++ b/argon1.sh
@@ -33,13 +33,23 @@ then
 	elif [ "$ID" = "ubuntu" ]
 	then
 		CHECKPLATFORM="Ubuntu"
+	elif [ "$ID" = "nixos" ]
+	then
+		CHECKPLATFORM="NixOS"
 	fi
+elif [ -n "$NIX_BUILD_CORES" ]
+then
+	CHECKPLATFORM="NixOS"
 fi
 
 
 if [ "$CHECKPLATFORM" = "Raspbian" ]
 then
 	pkglist=(raspi-gpio python3-rpi.gpio python3-smbus i2c-tools)
+elif [ "$CHECKPLATFORM" = "NixOS" ]
+then
+	# Dependencies managed by NixOS
+	pkglist=()
 else
 	# Todo handle lgpio
 	# Ubuntu has serial and i2c enabled
@@ -69,16 +79,16 @@ fi
 
 # Helper variables
 daemonname="argononed"
-powerbuttonscript=/usr/bin/$daemonname.py
-shutdownscript="/lib/systemd/system-shutdown/"$daemonname"-poweroff.py"
-daemonconfigfile=/etc/$daemonname.conf
-configscript=/usr/bin/argonone-config
-removescript=/usr/bin/argonone-uninstall
+powerbuttonscript=@pkgdir@/usr/bin/$daemonname.py
+shutdownscript="@pkgdir@/lib/systemd/system-shutdown/"$daemonname"-poweroff.py"
+daemonconfigfile=@pkgdir@/etc/$daemonname.conf
+configscript=@pkgdir@/usr/bin/argonone-config
+removescript=@pkgdir@/usr/bin/argonone-uninstall
 
 powerbuttonshutdownscript=$powerbuttonscript
 
 
-daemonfanservice=/lib/systemd/system/$daemonname.service
+daemonfanservice=@pkgdir@/lib/systemd/system/$daemonname.service
 
 if [ ! -f $daemonconfigfile ]; then
 	# Generate config file for fan speed
@@ -495,10 +505,13 @@ echo 'fi' >> $configscript
 sudo chmod 755 $configscript
 
 
-sudo systemctl daemon-reload
-sudo systemctl enable $daemonname.service
+if [ "$CHECKPLATFORM" != "NixOS" ]
+then
+	sudo systemctl daemon-reload
+	sudo systemctl enable $daemonname.service
 
-sudo systemctl start $daemonname.service
+	sudo systemctl start $daemonname.service
+fi
 
 
 shortcutfile="/home/pi/Desktop/argonone-config.desktop"
@@ -537,8 +550,8 @@ then
 fi
 
 # IR config script
-sudo wget https://download.argon40.com/argonone-irconfig.sh -O /usr/bin/argonone-ir --quiet
-sudo chmod 755 /usr/bin/argonone-ir
+sudo wget https://download.argon40.com/argonone-irconfig.sh -O @pkgdir@/usr/bin/argonone-ir --quiet
+sudo chmod 755 @pkgdir@/usr/bin/argonone-ir
 
 echo "***************************"
 echo "Argon One Setup Completed."