{ nix ? builtins.fetchGit ./.
, nixpkgs ? builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/nixos-21.05-small.tar.gz
, officialRelease ? false
, systems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ]
}:

let

  pkgs = import nixpkgs { system = builtins.currentSystem or "x86_64-linux"; };

  jobs = rec {


    tarball =
      with pkgs;

      with import ./release-common.nix { inherit pkgs; };

      releaseTools.sourceTarball {
        name = "nix-tarball";
        version = builtins.readFile ./.version;
        versionSuffix = if officialRelease then "" else "pre${toString nix.revCount}_${nix.shortRev}";
        src = nix;
        inherit officialRelease;

        buildInputs = tarballDeps ++ buildDeps ++ propagatedDeps;

        configureFlags = [ "--enable-gc" ];

        postUnpack = ''
          (cd $sourceRoot && find . -type f) | cut -c3- > $sourceRoot/.dist-files
          cat $sourceRoot/.dist-files
        '';

        preConfigure = ''
          (cd perl ; autoreconf --install --force --verbose)
          # TeX needs a writable font cache.
          export VARTEXFONTS=$TMPDIR/texfonts
        '';

        distPhase =
          ''
            runHook preDist
            make dist
            mkdir -p $out/tarballs
            cp *.tar.* $out/tarballs
          '';

        preDist = ''
          make install docdir=$out/share/doc/nix makefiles=doc/manual/local.mk
          echo "doc manual $out/share/doc/nix/manual" >> $out/nix-support/hydra-build-products
        '';
      };


    build = pkgs.lib.genAttrs systems (system:

      let pkgs = import nixpkgs { inherit system; }; in

      with pkgs;

      with import ./release-common.nix { inherit pkgs; };

      releaseTools.nixBuild {
        name = "nix";
        src = tarball;

        buildInputs = buildDeps;

        propagatedBuildInputs = propagatedDeps;

        preConfigure =
          # Copy libboost_context so we don't get all of Boost in our closure.
          # https://github.com/NixOS/nixpkgs/issues/45462
          ''
            mkdir -p $out/lib
            cp -pd ${boost}/lib/{libboost_context*,libboost_thread*,libboost_system*} $out/lib
            rm -f $out/lib/*.a
            ${lib.optionalString stdenv.isLinux ''
              chmod u+w $out/lib/*.so.*
              patchelf --set-rpath $out/lib:${stdenv.cc.cc.lib}/lib $out/lib/libboost_thread.so.*
            ''}
          '';

        configureFlags = configureFlags ++
          [ "--sysconfdir=/etc" ];

        enableParallelBuilding = true;

        makeFlags = "profiledir=$(out)/etc/profile.d";

        installFlags = "sysconfdir=$(out)/etc";

        doInstallCheck = true;
        installCheckFlags = "sysconfdir=$(out)/etc";

        separateDebugInfo = true;
      });


    perlBindings = pkgs.lib.genAttrs systems (system:

      let pkgs = import nixpkgs { inherit system; }; in with pkgs;

      releaseTools.nixBuild {
        name = "nix-perl";
        src = tarball;

        buildInputs =
          [ jobs.build.${system} curl bzip2 xz pkgconfig pkgs.perl boost ]
          ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
          ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.Security;

        configureFlags = [
          "--with-dbi=${perlPackages.DBI}/${pkgs.perl.libPrefix}"
          "--with-dbd-sqlite=${perlPackages.DBDSQLite}/${pkgs.perl.libPrefix}"
        ];

        enableParallelBuilding = true;

        postUnpack = "sourceRoot=$sourceRoot/perl";
      });


    binaryTarball = pkgs.lib.genAttrs systems (system:

      with import nixpkgs { inherit system; };

      let
        toplevel = builtins.getAttr system jobs.build;
        version = toplevel.src.version;
        installerClosureInfo = closureInfo { rootPaths = [ toplevel cacert ]; };
      in

      runCommand "nix-binary-tarball-${version}"
        { #nativeBuildInputs = lib.optional (system != "aarch64-linux") shellcheck;
          meta.description = "Distribution-independent Nix bootstrap binaries for ${system}";
        }
        ''
          cp ${installerClosureInfo}/registration $TMPDIR/reginfo
          cp ${./scripts/create-darwin-volume.sh} $TMPDIR/create-darwin-volume.sh
          substitute ${./scripts/install-nix-from-closure.sh} $TMPDIR/install \
            --subst-var-by nix ${toplevel} \
            --subst-var-by cacert ${cacert}
          substitute ${./scripts/install-darwin-multi-user.sh} $TMPDIR/install-darwin-multi-user.sh \
            --subst-var-by nix ${toplevel} \
            --subst-var-by cacert ${cacert}
          substitute ${./scripts/install-systemd-multi-user.sh} $TMPDIR/install-systemd-multi-user.sh \
            --subst-var-by nix ${toplevel} \
            --subst-var-by cacert ${cacert}
          substitute ${./scripts/install-multi-user.sh} $TMPDIR/install-multi-user \
            --subst-var-by nix ${toplevel} \
            --subst-var-by cacert ${cacert}

          if type -p shellcheck; then
            # SC1090: Don't worry about not being able to find
            #         $nix/etc/profile.d/nix.sh
            shellcheck --exclude SC1090 $TMPDIR/install
            shellcheck $TMPDIR/create-darwin-volume.sh
            shellcheck $TMPDIR/install-darwin-multi-user.sh
            shellcheck $TMPDIR/install-systemd-multi-user.sh

            # SC1091: Don't panic about not being able to source
            #         /etc/profile
            # SC2002: Ignore "useless cat" "error", when loading
            #         .reginfo, as the cat is a much cleaner
            #         implementation, even though it is "useless"
            # SC2116: Allow ROOT_HOME=$(echo ~root) for resolving
            #         root's home directory
            shellcheck --external-sources \
              --exclude SC1091,SC2002,SC2116 $TMPDIR/install-multi-user
          fi

          chmod +x $TMPDIR/install
          chmod +x $TMPDIR/create-darwin-volume.sh
          chmod +x $TMPDIR/install-darwin-multi-user.sh
          chmod +x $TMPDIR/install-systemd-multi-user.sh
          chmod +x $TMPDIR/install-multi-user
          dir=nix-${version}-${system}
          fn=$out/$dir.tar.xz
          mkdir -p $out/nix-support
          echo "file binary-dist $fn" >> $out/nix-support/hydra-build-products
          tar cvfJ $fn \
            --owner=0 --group=0 --mode=u+rw,uga+r \
            --absolute-names \
            --hard-dereference \
            --transform "s,$TMPDIR/install,$dir/install," \
            --transform "s,$TMPDIR/create-darwin-volume.sh,$dir/create-darwin-volume.sh," \
            --transform "s,$TMPDIR/reginfo,$dir/.reginfo," \
            --transform "s,$NIX_STORE,$dir/store,S" \
            $TMPDIR/install \
            $TMPDIR/create-darwin-volume.sh \
            $TMPDIR/install-darwin-multi-user.sh \
            $TMPDIR/install-systemd-multi-user.sh \
            $TMPDIR/install-multi-user \
            $TMPDIR/reginfo \
            $(cat ${installerClosureInfo}/store-paths)
        '');


    coverage =
      with pkgs;

      with import ./release-common.nix { inherit pkgs; };

      releaseTools.coverageAnalysis {
        name = "nix-build";
        src = tarball;

        enableParallelBuilding = true;

        buildInputs = buildDeps ++ propagatedDeps;

        dontInstall = false;

        doInstallCheck = true;

        lcovFilter = [ "*/boost/*" "*-tab.*" "*/nlohmann/*" "*/linenoise/*" ];

        # We call `dot', and even though we just use it to
        # syntax-check generated dot files, it still requires some
        # fonts.  So provide those.
        FONTCONFIG_FILE = texFunctions.fontsConf;
      };


    # System tests.
    tests.remoteBuilds = (import ./tests/remote-builds.nix rec {
      inherit nixpkgs;
      nix = build.x86_64-linux; system = "x86_64-linux";
    });

    tests.nix-copy-closure = (import ./tests/nix-copy-closure.nix rec {
      inherit nixpkgs;
      nix = build.x86_64-linux; system = "x86_64-linux";
    });

    tests.ca-fd-leak = (import ./tests/nixos/ca-fd-leak rec {
      inherit nixpkgs;
      nix = build.x86_64-linux; system = "x86_64-linux";
    });

    tests.setuid = pkgs.lib.genAttrs
      ["i686-linux" "x86_64-linux"]
      (system:
        import ./tests/setuid.nix rec {
          inherit nixpkgs;
          nix = build.${system}; inherit system;
        });

    /*
    tests.evalNixpkgs =
      import (nixpkgs + "/pkgs/top-level/make-tarball.nix") {
        inherit nixpkgs;
        inherit pkgs;
        nix = build.x86_64-linux;
        officialRelease = false;
      };

    tests.evalNixOS =
      pkgs.runCommand "eval-nixos" { buildInputs = [ build.x86_64-linux ]; }
        ''
          export NIX_STATE_DIR=$TMPDIR

          nix-instantiate ${nixpkgs}/nixos/release-combined.nix -A tested --dry-run \
            --arg nixpkgs '{ outPath = ${nixpkgs}; revCount = 123; shortRev = "abcdefgh"; }'

          touch $out
        '';
    */


    installerScript =
      pkgs.runCommand "installer-script"
        { buildInputs = [ build.x86_64-linux ];
        }
        ''
          mkdir -p $out/nix-support

          substitute ${./scripts/install.in} $out/install \
            ${pkgs.lib.concatMapStrings
              (system: "--replace '@binaryTarball_${system}@' $(nix hash-file --base16 --type sha256 ${binaryTarball.${system}}/*.tar.xz) ")
              [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux" ]
            } \
            --replace '@nixVersion@' ${build.x86_64-linux.src.version}

          echo "file installer $out/install" >> $out/nix-support/hydra-build-products
        '';

  };


in jobs