thermostat/flake.nix

{
  description = "Firmware for the Sinara 8451 Thermostat";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
  inputs.rust-overlay = { 
    url = "github:oxalica/rust-overlay";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, rust-overlay }:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import rust-overlay) ]; };

      rust = pkgs.rust-bin.stable."1.66.0".default.override {
        extensions = [ "rust-src" ];
        targets = [ "thumbv7em-none-eabihf" ];
      };
      rustPlatform = pkgs.makeRustPlatform {
        rustc = rust;
        cargo = rust;
      };

      thermostat = rustPlatform.buildRustPackage {
        name = "thermostat";
        version = "0.0.0";

        src = self;
        cargoLock = { 
          lockFile = ./Cargo.lock;
          outputHashes = {
            "stm32-eth-0.2.0" = "sha256-48RpZgagUqgVeKm7GXdk3Oo0v19ScF9Uby0nTFlve2o=";
          };
        };

        nativeBuildInputs = [ pkgs.llvm ];

        buildPhase = ''
          cargo build --release --bin thermostat
        '';

        installPhase = ''
          mkdir -p $out $out/nix-support
          cp target/thumbv7em-none-eabihf/release/thermostat $out/thermostat.elf
          echo file binary-dist $out/thermostat.elf >> $out/nix-support/hydra-build-products
          llvm-objcopy -O binary target/thumbv7em-none-eabihf/release/thermostat $out/thermostat.bin
          echo file binary-dist $out/thermostat.bin >> $out/nix-support/hydra-build-products
        '';

        dontFixup = true;
        auditable = false;
      };

      pytec-dev-wrappers = pkgs.runCommandNoCC "pytec-dev-wrappers" { } ''
        mkdir -p $out/bin
        for program in ${self}/pytec/*.py; do
          if [ -x $program ]; then
            progname=`basename -s .py $program`
            outname=$out/bin/$progname
            echo "#!${pkgs.bash}/bin/bash" >> $outname
            echo "exec python3 -m pytec.$progname \"\$@\"" >> $outname
            chmod 755 $outname
          fi
        done
      '';
    in {
      packages.x86_64-linux = {
        inherit thermostat;
        default = thermostat;
      };

      hydraJobs = {
        inherit thermostat;
      };

      devShells.x86_64-linux.default = pkgs.mkShellNoCC {
        name = "thermostat-dev-shell";
        packages = with pkgs; [
          rust llvm
          openocd dfu-util rlwrap
          pytec-dev-wrappers
          ] ++ (with python3Packages; [
            numpy matplotlib
          ]);
        shellHook = ''
          export PYTHONPATH=`pwd`/pytec:$PYTHONPATH
        '';
      };
    };
}