{
  description = "A leading-edge control system for quantum information experiments";

  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
  inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
  inputs.sipyco.url = github:m-labs/sipyco;
  inputs.sipyco.inputs.nixpkgs.follows = "nixpkgs";
  inputs.src-pythonparser = { url = github:m-labs/pythonparser; flake = false; };
  inputs.artiq-comtools.url = github:m-labs/artiq-comtools;
  inputs.artiq-comtools.inputs.nixpkgs.follows = "nixpkgs";
  inputs.artiq-comtools.inputs.sipyco.follows = "sipyco";

  inputs.src-migen = { url = github:m-labs/migen; flake = false; };
  inputs.src-misoc = { type = "git"; url = "https://github.com/m-labs/misoc.git"; submodules = true; flake = false; };

  outputs = { self, nixpkgs, mozilla-overlay, sipyco, src-pythonparser, artiq-comtools, src-migen, src-misoc }:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) ]; };
      pkgs-aarch64 = import nixpkgs { system = "aarch64-linux"; };

      artiqVersionMajor = 8;
      artiqVersionMinor = self.sourceInfo.revCount or 0;
      artiqVersionId = self.sourceInfo.shortRev or "unknown";
      artiqVersion = (builtins.toString artiqVersionMajor) + "." + (builtins.toString artiqVersionMinor) + "+" + artiqVersionId + ".beta";
      artiqRev = self.sourceInfo.rev or "unknown";

      rustManifest = pkgs.fetchurl {
        url = "https://static.rust-lang.org/dist/2021-01-29/channel-rust-nightly.toml";
        sha256 = "sha256-EZKgw89AH4vxaJpUHmIMzMW/80wAFQlfcxRoBD9nz0c=";
      };

      targets = [];
      rustChannelOfTargets = _channel: _date: targets:
        (pkgs.lib.rustLib.fromManifestFile rustManifest {
          inherit (pkgs) stdenv lib fetchurl patchelf;
        }).rust.override {
          inherit targets;
          extensions = ["rust-src"];
        };
      rust = rustChannelOfTargets "nightly" null targets;
      rustPlatform = pkgs.recurseIntoAttrs (pkgs.makeRustPlatform {
        rustc = rust;
        cargo = rust;
      });

      cargo-xbuild = pkgs.cargo-xbuild.overrideAttrs(oa: {
        postPatch = "substituteInPlace src/sysroot.rs --replace 2021 2018";
      });

      vivadoDeps = pkgs: with pkgs; let
        # Apply patch from https://github.com/nix-community/nix-environments/pull/54
        # to fix ncurses libtinfo.so's soname issue
        ncurses' = ncurses5.overrideAttrs (old: {
          configureFlags = old.configureFlags ++ [ "--with-termlib" ];
          postFixup = "";
        });
      in [
        libxcrypt-legacy
        (ncurses'.override { unicodeSupport = false; })
        zlib
        libuuid
        xorg.libSM
        xorg.libICE
        xorg.libXrender
        xorg.libX11
        xorg.libXext
        xorg.libXtst
        xorg.libXi
        freetype
        fontconfig
      ];

      pythonparser = pkgs.python3Packages.buildPythonPackage {
        pname = "pythonparser";
        version = "1.4";
        src = src-pythonparser;
        doCheck = false;
        propagatedBuildInputs = with pkgs.python3Packages; [ regex ];
      };

      qasync = pkgs.python3Packages.buildPythonPackage rec {
        pname = "qasync";
        version = "0.24.1";
        src = pkgs.fetchFromGitHub {
          owner = "CabbageDevelopment";
          repo = "qasync";
          rev = "v${version}";
          sha256 = "sha256-DAzmobw+c29Pt/URGO3bWXHBxgu9bDHhdTUBE9QJDe4=";
        };
        propagatedBuildInputs = [ pkgs.python3Packages.pyqt5 ];
        nativeCheckInputs = [ pkgs.python3Packages.pytest-runner pkgs.python3Packages.pytestCheckHook ];
        disabledTestPaths = [ "tests/test_qeventloop.py" ];
      };

      libartiq-support = pkgs.stdenv.mkDerivation {
        name = "libartiq-support";
        src = self;
        buildInputs = [ rust ];
        buildPhase = ''
          rustc $src/artiq/test/libartiq_support/lib.rs -Cpanic=unwind -g
        '';
        installPhase = ''
          mkdir -p $out/lib $out/bin
          cp libartiq_support.so $out/lib
          cat > $out/bin/libartiq-support << EOF
          #!/bin/sh
          echo $out/lib/libartiq_support.so
          EOF
          chmod 755 $out/bin/libartiq-support
        '';
      };

      llvmlite-new = pkgs.python3Packages.buildPythonPackage rec {
        pname = "llvmlite";
        version = "0.40.1";
        src = pkgs.fetchFromGitHub {
            owner = "numba";
            repo = "llvmlite";
            rev = "v${version}";
            sha256 = "sha256-gPEda9cMEsruvBt8I2VFfsTKZaPsNDgqx2Y9n0MSc4Y=";
          };
        nativeBuildInputs = [ pkgs.llvm_14 ];
        # Disable static linking
        # https://github.com/numba/llvmlite/issues/93
        postPatch = ''
          substituteInPlace ffi/Makefile.linux --replace "-static-libstdc++" ""
          substituteInPlace llvmlite/tests/test_binding.py --replace "test_linux" "nope"
        '';
        # Set directory containing llvm-config binary
        preConfigure = ''
          export LLVM_CONFIG=${pkgs.llvm_14.dev}/bin/llvm-config
        '';
      };

      artiq-upstream = pkgs.python3Packages.buildPythonPackage rec {
        pname = "artiq";
        version = artiqVersion;
        src = self;

        preBuild =
          ''
          export VERSIONEER_OVERRIDE=${version}
          export VERSIONEER_REV=${artiqRev}
          '';

        nativeBuildInputs = [ pkgs.qt5.wrapQtAppsHook ];
        # keep llvm_x and lld_x in sync with llvmlite
        propagatedBuildInputs = [ pkgs.llvm_14 pkgs.lld_14 sipyco.packages.x86_64-linux.sipyco pythonparser llvmlite-new pkgs.qt5.qtsvg artiq-comtools.packages.x86_64-linux.artiq-comtools ]
          ++ (with pkgs.python3Packages; [ pyqtgraph pygit2 numpy dateutil scipy prettytable pyserial levenshtein h5py pyqt5 qasync tqdm lmdb jsonschema ]);

        dontWrapQtApps = true;
        postFixup = ''
          wrapQtApp "$out/bin/artiq_dashboard"
          wrapQtApp "$out/bin/artiq_browser"
          wrapQtApp "$out/bin/artiq_session"
        '';

        preFixup =
          ''
          # Ensure that wrapProgram uses makeShellWrapper rather than makeBinaryWrapper
          # brought in by wrapQtAppsHook. Only makeShellWrapper supports --run.
          wrapProgram() { wrapProgramShell "$@"; }
          '';
        ## Modifies PATH to pass the wrapped python environment (i.e. python3.withPackages(...) to subprocesses.
        ## Allows subprocesses using python to find all packages you have installed
        makeWrapperArgs = [
          ''--run 'if [ ! -z "$NIX_PYTHONPREFIX" ]; then export PATH=$NIX_PYTHONPREFIX/bin:$PATH;fi' ''
          "--set FONTCONFIG_FILE ${pkgs.fontconfig.out}/etc/fonts/fonts.conf"
        ];

        # FIXME: automatically propagate lld_14 llvm_14 dependencies
        # cacert is required in the check stage only, as certificates are to be
        # obtained from system elsewhere
        nativeCheckInputs = with pkgs; [ lld_14 llvm_14 lit outputcheck cacert ] ++ [ libartiq-support ];
        checkPhase = ''
          python -m unittest discover -v artiq.test

          TESTDIR=`mktemp -d`
          cp --no-preserve=mode,ownership -R $src/artiq/test/lit $TESTDIR
          LIBARTIQ_SUPPORT=`libartiq-support` lit -v $TESTDIR/lit
          '';
      };

      artiq = artiq-upstream // {
        withExperimentalFeatures = features: artiq-upstream.overrideAttrs(oa:
            { patches = map (f: ./experimental-features/${f}.diff) features; });
      };

      migen = pkgs.python3Packages.buildPythonPackage rec {
        name = "migen";
        src = src-migen;
        format = "pyproject";
        nativeBuildInputs = [ pkgs.python3Packages.setuptools ];
        propagatedBuildInputs = [ pkgs.python3Packages.colorama ];
      };

      asyncserial = pkgs.python3Packages.buildPythonPackage rec {
        pname = "asyncserial";
        version = "0.1";
        src = pkgs.fetchFromGitHub {
          owner = "m-labs";
          repo = "asyncserial";
          rev = "d95bc1d6c791b0e9785935d2f62f628eb5cdf98d";
          sha256 = "0yzkka9jk3612v8gx748x6ziwykq5lr7zmr9wzkcls0v2yilqx9k";
        };
        propagatedBuildInputs = [ pkgs.python3Packages.pyserial ];
      };

      misoc = pkgs.python3Packages.buildPythonPackage {
        name = "misoc";
        src = src-misoc;
        propagatedBuildInputs = with pkgs.python3Packages; [ jinja2 numpy migen pyserial asyncserial ];
      };

      microscope = pkgs.python3Packages.buildPythonPackage rec {
        pname = "microscope";
        version = "unstable-2020-12-28";
        src = pkgs.fetchFromGitHub {
          owner = "m-labs";
          repo = "microscope";
          rev = "c21afe7a53258f05bde57e5ebf2e2761f3d495e4";
          sha256 = "sha256-jzyiLRuEf7p8LdhmZvOQj/dyQx8eUE8p6uRlwoiT8vg=";
        };
        propagatedBuildInputs = with pkgs.python3Packages; [ pyserial prettytable msgpack migen ];
      };

      vivadoEnv = pkgs.buildFHSEnv {
        name = "vivado-env";
        targetPkgs = vivadoDeps;
      };

      vivado = pkgs.buildFHSEnv {
        name = "vivado";
        targetPkgs = vivadoDeps;
        profile = "set -e; source /opt/Xilinx/Vivado/2022.2/settings64.sh";
        runScript = "vivado";
      };

      makeArtiqBoardPackage = { target, variant, buildCommand ? "python -m artiq.gateware.targets.${target} -V ${variant}", experimentalFeatures ? [] }:
        pkgs.stdenv.mkDerivation {
          name = "artiq-board-${target}-${variant}";
          phases = [ "buildPhase" "checkPhase" "installPhase" ];
          cargoDeps = rustPlatform.importCargoLock {
            lockFile = ./artiq/firmware/Cargo.lock;
            outputHashes = {
              "fringe-1.2.1" = "sha256-m4rzttWXRlwx53LWYpaKuU5AZe4GSkbjHS6oINt5d3Y=";
              "tar-no-std-0.1.8" = "sha256-xm17108v4smXOqxdLvHl9CxTCJslmeogjm4Y87IXFuM=";
            };
          };
          nativeBuildInputs = [
            (pkgs.python3.withPackages(ps: [ migen misoc (artiq.withExperimentalFeatures experimentalFeatures) ps.packaging ]))
            rust
            cargo-xbuild
            pkgs.llvmPackages_14.clang-unwrapped
            pkgs.llvm_14
            pkgs.lld_14
            vivado
            rustPlatform.cargoSetupHook
          ];
          buildPhase = 
            ''
            ARTIQ_PATH=`python -c "import artiq; print(artiq.__path__[0])"`
            ln -s $ARTIQ_PATH/firmware/Cargo.lock .
            cargoSetupPostUnpackHook
            cargoSetupPostPatchHook
            ${buildCommand}
            '';
          doCheck = true;
          checkPhase =
            ''
            # Search for PCREs in the Vivado output to check for errors
            check_log() {
              grep -Pe "$1" artiq_${target}/${variant}/gateware/vivado.log && exit 1 || true
            }
            check_log "\d+ constraint not met\."
            check_log "Timing constraints are not met\."
            '';
          installPhase =
            ''
            mkdir $out
            cp artiq_${target}/${variant}/gateware/top.bit $out
            if [ -e artiq_${target}/${variant}/software/bootloader/bootloader.bin ]
            then cp artiq_${target}/${variant}/software/bootloader/bootloader.bin $out
            fi
            if [ -e artiq_${target}/${variant}/software/runtime ]
            then cp artiq_${target}/${variant}/software/runtime/runtime.{elf,fbi} $out
            else cp artiq_${target}/${variant}/software/satman/satman.{elf,fbi} $out
            fi

            mkdir $out/nix-support
            for i in $out/*.*; do
            echo file binary-dist $i >> $out/nix-support/hydra-build-products
            done
            '';
          # don't mangle ELF files as they are not for NixOS
          dontFixup = true;
        };

      openocd-bscanspi-f = pkgs: let
        bscan_spi_bitstreams-pkg = pkgs.stdenv.mkDerivation {
          name = "bscan_spi_bitstreams";
          src = pkgs.fetchFromGitHub {
            owner = "quartiq";
            repo = "bscan_spi_bitstreams";
            rev = "01d8f819f15baf9a8cc5d96945a51e4d267ff564";
            sha256 = "1zqv47kzgvbn4c8cr019a6wcja7gn5h1z4kvw5bhpc72fyhagal9";
          };
          phases = ["installPhase"];
          installPhase =
          ''
          mkdir -p $out/share/bscan-spi-bitstreams
          cp $src/*.bit $out/share/bscan-spi-bitstreams
          '';
        };
        # https://docs.lambdaconcept.com/screamer/troubleshooting.html#error-contents-differ
        openocd-fixed = pkgs.openocd.overrideAttrs(oa: {
          version = "unstable-2021-09-15";
          src = pkgs.fetchFromGitHub {
            owner = "openocd-org";
            repo = "openocd";
            rev = "a0bd3c9924870c3b8f428648410181040dabc33c";
            sha256 = "sha256-YgUsl4/FohfsOncM4uiz/3c6g2ZN4oZ0y5vV/2Skwqg=";
            fetchSubmodules = true;
          };
          patches = [
            (pkgs.fetchurl {
              url = "https://git.m-labs.hk/M-Labs/nix-scripts/raw/commit/575ef05cd554c239e4cc8cb97ae4611db458a80d/artiq-fast/pkgs/openocd-jtagspi.diff";
              sha256 = "0g3crk8gby42gm661yxdcgapdi8sp050l5pb2d0yjfic7ns9cw81";
            })
          ];
          nativeBuildInputs = oa.nativeBuildInputs or [] ++ [ pkgs.autoreconfHook269 ];
        });
      in pkgs.buildEnv {
        name = "openocd-bscanspi";
        paths = [ openocd-fixed bscan_spi_bitstreams-pkg ];
      };

      latex-artiq-manual = pkgs.texlive.combine {
        inherit (pkgs.texlive)
          scheme-basic latexmk cmap collection-fontsrecommended fncychap
          titlesec tabulary varwidth framed fancyvrb float wrapfig parskip
          upquote capt-of needspace etoolbox booktabs;
      };

      artiq-frontend-dev-wrappers = pkgs.runCommandNoCC "artiq-frontend-dev-wrappers" {}
        ''
        mkdir -p $out/bin
        for program in ${self}/artiq/frontend/*.py; do
          if [ -x $program ]; then
            progname=`basename -s .py $program`
            outname=$out/bin/$progname
            echo "#!${pkgs.bash}/bin/bash" >> $outname
            echo "exec python3 -m artiq.frontend.$progname \"\$@\"" >> $outname
            chmod 755 $outname
          fi
        done
        '';
    in rec {
      packages.x86_64-linux = {
        inherit pythonparser qasync artiq;
        inherit migen misoc asyncserial microscope vivadoEnv vivado;
        openocd-bscanspi = openocd-bscanspi-f pkgs;
        artiq-board-kc705-nist_clock = makeArtiqBoardPackage {
          target = "kc705";
          variant = "nist_clock";
        };
        artiq-board-efc-shuttler = makeArtiqBoardPackage {
          target = "efc";
          variant = "shuttler";
        };
        inherit latex-artiq-manual;
        artiq-manual-html = pkgs.stdenvNoCC.mkDerivation rec {
          name = "artiq-manual-html-${version}";
          version = artiqVersion;
          src = self;
          buildInputs = with pkgs.python3Packages; [
            sphinx sphinx_rtd_theme
            sphinx-argparse sphinxcontrib-wavedrom
          ];
          buildPhase = ''
            export VERSIONEER_OVERRIDE=${artiqVersion}
            export SOURCE_DATE_EPOCH=${builtins.toString self.sourceInfo.lastModified}
            cd doc/manual
            make html
          '';
          installPhase = ''
            cp -r _build/html $out
            mkdir $out/nix-support
            echo doc manual $out index.html >> $out/nix-support/hydra-build-products
          '';
        };
        artiq-manual-pdf = pkgs.stdenvNoCC.mkDerivation rec {
          name = "artiq-manual-pdf-${version}";
          version = artiqVersion;
          src = self;
          buildInputs = with pkgs.python3Packages; [
            sphinx sphinx_rtd_theme
            sphinx-argparse sphinxcontrib-wavedrom
          ] ++ [ latex-artiq-manual ];
          buildPhase = ''
            export VERSIONEER_OVERRIDE=${artiq.version}
            export SOURCE_DATE_EPOCH=${builtins.toString self.sourceInfo.lastModified}
            cd doc/manual
            make latexpdf
          '';
          installPhase = ''
            mkdir $out
            cp _build/latex/ARTIQ.pdf $out
            mkdir $out/nix-support
            echo doc-pdf manual $out ARTIQ.pdf >> $out/nix-support/hydra-build-products
          '';
        };
      };

      inherit makeArtiqBoardPackage openocd-bscanspi-f;

      defaultPackage.x86_64-linux = pkgs.python3.withPackages(ps: [ packages.x86_64-linux.artiq ]);

      # Main development shell with everything you need to develop ARTIQ on Linux.
      # The current copy of the ARTIQ sources is added to PYTHONPATH so changes can be tested instantly.
      # Additionally, executable wrappers that import the current ARTIQ sources for the ARTIQ frontends
      # are added to PATH.
      devShells.x86_64-linux.default = pkgs.mkShell {
        name = "artiq-dev-shell";
        buildInputs = [
          (pkgs.python3.withPackages(ps: with packages.x86_64-linux; [ migen misoc ps.paramiko microscope ps.packaging ] ++ artiq.propagatedBuildInputs ))
          rust
          cargo-xbuild
          pkgs.llvmPackages_14.clang-unwrapped
          pkgs.llvm_14
          pkgs.lld_14
          pkgs.git
          artiq-frontend-dev-wrappers
          # To manually run compiler tests:
          pkgs.lit
          pkgs.outputcheck
          libartiq-support
          # use the vivado-env command to enter a FHS shell that lets you run the Vivado installer
          packages.x86_64-linux.vivadoEnv
          packages.x86_64-linux.vivado
          packages.x86_64-linux.openocd-bscanspi
          pkgs.python3Packages.sphinx pkgs.python3Packages.sphinx_rtd_theme
          pkgs.python3Packages.sphinx-argparse pkgs.python3Packages.sphinxcontrib-wavedrom latex-artiq-manual
        ];
        shellHook = ''
          export LIBARTIQ_SUPPORT=`libartiq-support`
          export QT_PLUGIN_PATH=${pkgs.qt5.qtbase}/${pkgs.qt5.qtbase.dev.qtPluginPrefix}:${pkgs.qt5.qtsvg.bin}/${pkgs.qt5.qtbase.dev.qtPluginPrefix}
          export QML2_IMPORT_PATH=${pkgs.qt5.qtbase}/${pkgs.qt5.qtbase.dev.qtQmlPrefix}
          export PYTHONPATH=`git rev-parse --show-toplevel`:$PYTHONPATH
        '';
      };

      # Lighter development shell optimized for building firmware and flashing boards.
      devShells.x86_64-linux.boards = pkgs.mkShell {
        name = "artiq-boards-shell";
        buildInputs = [
          (pkgs.python3.withPackages(ps: with packages.x86_64-linux; [ migen misoc artiq ps.packaging ]))
          rust
          cargo-xbuild
          pkgs.llvmPackages_14.clang-unwrapped
          pkgs.llvm_14
          pkgs.lld_14
          packages.x86_64-linux.vivado
          packages.x86_64-linux.openocd-bscanspi
        ];
      };

      packages.aarch64-linux = {
        openocd-bscanspi = openocd-bscanspi-f pkgs-aarch64;
      };

      hydraJobs = {
        inherit (packages.x86_64-linux) artiq artiq-board-kc705-nist_clock artiq-board-efc-shuttler openocd-bscanspi;
        gateware-sim = pkgs.stdenvNoCC.mkDerivation {
          name = "gateware-sim";
          buildInputs = [
            (pkgs.python3.withPackages(ps: with packages.x86_64-linux; [ migen misoc artiq ]))
          ];
          phases = [ "buildPhase" ];
          buildPhase =
            ''
            python -m unittest discover -v artiq.gateware.test
            touch $out
            '';
        };
        kc705-hitl = pkgs.stdenvNoCC.mkDerivation {
          name = "kc705-hitl";

          __networked = true;  # compatibility with old patched Nix
          # breaks hydra, https://github.com/NixOS/hydra/issues/1216
          #__impure = true;     # Nix 2.8+

          buildInputs = [
            (pkgs.python3.withPackages(ps: with packages.x86_64-linux; [ artiq ps.paramiko ]))
            pkgs.llvm_14
            pkgs.lld_14
            pkgs.openssh
            packages.x86_64-linux.openocd-bscanspi  # for the bscanspi bitstreams
          ];
          phases = [ "buildPhase" ];
          buildPhase =
            ''
            export HOME=`mktemp -d`
            mkdir $HOME/.ssh
            cp /opt/hydra_id_ed25519 $HOME/.ssh/id_ed25519
            cp /opt/hydra_id_ed25519.pub $HOME/.ssh/id_ed25519.pub
            echo "rpi-1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIACtBFDVBYoAE4fpJCTANZSE0bcVpTR3uvfNvb80C4i5" > $HOME/.ssh/known_hosts
            chmod 600 $HOME/.ssh/id_ed25519
            LOCKCTL=$(mktemp -d)
            mkfifo $LOCKCTL/lockctl

            cat $LOCKCTL/lockctl | ${pkgs.openssh}/bin/ssh \
              -i $HOME/.ssh/id_ed25519 \
              -o UserKnownHostsFile=$HOME/.ssh/known_hosts \
              rpi-1 \
              'mkdir -p /tmp/board_lock && flock /tmp/board_lock/kc705-1 -c "echo Ok; cat"' \
            | (
              # End remote flock via FIFO
              atexit_unlock() {
                echo > $LOCKCTL/lockctl
              }
              trap atexit_unlock EXIT

              # Read "Ok" line when remote successfully locked
              read LOCK_OK

              artiq_flash -t kc705 -H rpi-1 -d ${packages.x86_64-linux.artiq-board-kc705-nist_clock}
              sleep 30

              export ARTIQ_ROOT=`python -c "import artiq; print(artiq.__path__[0])"`/examples/kc705_nist_clock
              export ARTIQ_LOW_LATENCY=1
              python -m unittest discover -v artiq.test.coredevice
            )

            touch $out
            '';
        };
        inherit (packages.x86_64-linux) artiq-manual-html artiq-manual-pdf;
      };
    };

  nixConfig = {
    extra-trusted-public-keys = "nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc=";
    extra-substituters = "https://nixbld.m-labs.hk";
    extra-sandbox-paths = "/opt";
  };
}