Merge pull request #730 from NixOS/flake

Flake support
2020-04-07 11:18:38 +02:00 · 2020-04-07 11:18:38 +02:00 · 4cabb37ebd
parent 62e6c65e68 681d84da0f
commit 4cabb37ebd
16 changed files with 609 additions and 387 deletions
--- a/default.nix
+++ b/default.nix
@ -0,0 +1,3 @@
+(import (fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = builtins.fetchGit ./.;
+}).defaultNix
--- a/flake.lock
+++ b/flake.lock
@ -0,0 +1,65 @@
+{
+  "nodes": {
+    "nix": {
+      "info": {
+        "lastModified": 1585573619,
+        "narHash": "sha256-QbAxdnDkVvSVgkCNRbt3fUPUSNbeq9y3u7Vek/7Ib44="
+      },
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "owner": "NixOS",
+        "repo": "nix",
+        "rev": "3e7aab81ce6787e01ea4ced5af1fc6a84e523762",
+        "type": "github"
+      },
+      "original": {
+        "id": "nix",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "info": {
+        "lastModified": 1585405475,
+        "narHash": "sha256-bESW0n4KgPmZ0luxvwJ+UyATrC6iIltVCsGdLiphVeE="
+      },
+      "locked": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b88ff468e9850410070d4e0ccd68c7011f15b2be",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-20.03-small",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "info": {
+        "lastModified": 1585388205,
+        "narHash": "sha256-lOXYmCE6FSikoOHr1HFIkNLnA0qdYhe8CxB8rE6+SnE="
+      },
+      "locked": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b0c285807d6a9f1b7562ec417c24fa1a30ecc31a",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-20.03",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nix": "nix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    }
+  },
+  "root": "root",
+  "version": 5
+}
--- a/flake.nix
+++ b/flake.nix
@ -0,0 +1,345 @@
+{
+  description = "A Nix-based continuous build system";
+
+  edition = 201909;
+
+  inputs.nixpkgs.url = "nixpkgs/nixos-20.03";
+
+  outputs = { self, nixpkgs, nix }:
+    let
+
+      version = "${builtins.readFile ./version}.${builtins.substring 0 8 self.lastModified}.${self.shortRev or "DIRTY"}";
+
+      pkgs = import nixpkgs {
+        system = "x86_64-linux";
+        overlays = [ self.overlay nix.overlay ];
+      };
+
+      # NixOS configuration used for VM tests.
+      hydraServer =
+        { config, pkgs, ... }:
+        { imports = [ self.nixosModules.hydraTest ];
+
+          virtualisation.memorySize = 1024;
+          virtualisation.writableStore = true;
+
+          environment.systemPackages = [ pkgs.perlPackages.LWP pkgs.perlPackages.JSON ];
+
+          nix = {
+            # Without this nix tries to fetch packages from the default
+            # cache.nixos.org which is not reachable from this sandboxed NixOS test.
+            binaryCaches = [];
+          };
+        };
+
+    in rec {
+
+      # A Nixpkgs overlay that provides a 'hydra' package.
+      overlay = final: prev: {
+
+        hydra = with final; let
+
+          perlDeps = buildEnv {
+            name = "hydra-perl-deps";
+            paths = with perlPackages; lib.closePropagation
+              [ ModulePluggable
+                CatalystActionREST
+                CatalystAuthenticationStoreDBIxClass
+                CatalystDevel
+                CatalystDispatchTypeRegex
+                CatalystPluginAccessLog
+                CatalystPluginAuthorizationRoles
+                CatalystPluginCaptcha
+                CatalystPluginSessionStateCookie
+                CatalystPluginSessionStoreFastMmap
+                CatalystPluginStackTrace
+                CatalystPluginUnicodeEncoding
+                CatalystTraitForRequestProxyBase
+                CatalystViewDownload
+                CatalystViewJSON
+                CatalystViewTT
+                CatalystXScriptServerStarman
+                CatalystXRoleApplicator
+                CryptRandPasswd
+                DBDPg
+                DBDSQLite
+                DataDump
+                DateTime
+                DigestSHA1
+                EmailMIME
+                EmailSender
+                FileSlurp
+                IOCompress
+                IPCRun
+                JSON
+                JSONAny
+                JSONXS
+                LWP
+                LWPProtocolHttps
+                NetAmazonS3
+                NetPrometheus
+                NetStatsd
+                PadWalker
+                Readonly
+                SQLSplitStatement
+                SetScalar
+                Starman
+                SysHostnameLong
+                TermSizeAny
+                TestMore
+                TextDiff
+                TextTable
+                XMLSimple
+                final.nix
+                final.nix.perl-bindings
+                git
+              ];
+          };
+
+        in stdenv.mkDerivation {
+
+          name = "hydra-${version}";
+
+          src = self;
+
+          buildInputs =
+            [ makeWrapper autoconf automake libtool unzip nukeReferences pkgconfig sqlite libpqxx
+              gitAndTools.topGit mercurial darcs subversion bazaar openssl bzip2 libxslt
+              perlDeps perl final.nix
+              postgresql95 # for running the tests
+              boost
+              (if lib.versionAtLeast lib.version "20.03pre"
+               then nlohmann_json
+               else nlohmann_json.override { multipleHeaders = true; })
+            ];
+
+          hydraPath = lib.makeBinPath (
+            [ sqlite subversion openssh final.nix coreutils findutils pixz
+              gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused bazaar
+            ] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] );
+
+          configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];
+
+          shellHook = ''
+            PATH=$(pwd)/src/hydra-evaluator:$(pwd)/src/script:$(pwd)/src/hydra-eval-jobs:$(pwd)/src/hydra-queue-runner:$PATH
+            PERL5LIB=$(pwd)/src/lib:$PERL5LIB
+          '';
+
+          preConfigure = "autoreconf -vfi";
+
+          NIX_LDFLAGS = [ "-lpthread" ];
+
+          enableParallelBuilding = true;
+
+          doCheck = true;
+
+          preCheck = ''
+            patchShebangs .
+            export LOGNAME=''${LOGNAME:-foo}
+          '';
+
+          postInstall = ''
+            mkdir -p $out/nix-support
+
+            for i in $out/bin/*; do
+                read -n 4 chars < $i
+                if [[ $chars =~ ELF ]]; then continue; fi
+                wrapProgram $i \
+                    --prefix PERL5LIB ':' $out/libexec/hydra/lib:$PERL5LIB \
+                    --prefix PATH ':' $out/bin:$hydraPath \
+                    --set HYDRA_RELEASE ${version} \
+                    --set HYDRA_HOME $out/libexec/hydra \
+                    --set NIX_RELEASE ${final.nix.name or "unknown"}
+            done
+          '';
+
+          dontStrip = true;
+
+          meta.description = "Build of Hydra on ${system}";
+          passthru.perlDeps = perlDeps;
+        };
+      };
+
+      hydraJobs = {
+
+        build.x86_64-linux = packages.x86_64-linux.hydra;
+
+        manual =
+          pkgs.runCommand "hydra-manual-${version}" {}
+          ''
+            mkdir -p $out/share
+            cp -prvd ${pkgs.hydra}/share/doc $out/share/
+
+            mkdir $out/nix-support
+            echo "doc manual $out/share/doc/hydra" >> $out/nix-support/hydra-build-products
+          '';
+
+        tests.install.x86_64-linux =
+          with import (nixpkgs + "/nixos/lib/testing.nix") { system = "x86_64-linux"; };
+          simpleTest {
+            machine = hydraServer;
+            testScript =
+              ''
+                $machine->waitForJob("hydra-init");
+                $machine->waitForJob("hydra-server");
+                $machine->waitForJob("hydra-evaluator");
+                $machine->waitForJob("hydra-queue-runner");
+                $machine->waitForOpenPort("3000");
+                $machine->succeed("curl --fail http://localhost:3000/");
+              '';
+          };
+
+        tests.api.x86_64-linux =
+          with import (nixpkgs + "/nixos/lib/testing.nix") { system = "x86_64-linux"; };
+          simpleTest {
+            machine = hydraServer;
+            testScript =
+              let dbi = "dbi:Pg:dbname=hydra;user=root;"; in
+              ''
+                $machine->waitForJob("hydra-init");
+
+                # Create an admin account and some other state.
+                $machine->succeed
+                    ( "su - hydra -c \"hydra-create-user root --email-address 'alice\@example.org' --password foobar --role admin\""
+                    , "mkdir /run/jobset /tmp/nix"
+                    , "chmod 755 /run/jobset /tmp/nix"
+                    , "cp ${./tests/api-test.nix} /run/jobset/default.nix"
+                    , "chmod 644 /run/jobset/default.nix"
+                    , "chown -R hydra /run/jobset /tmp/nix"
+                    );
+
+                $machine->succeed("systemctl stop hydra-evaluator hydra-queue-runner");
+                $machine->waitForJob("hydra-server");
+                $machine->waitForOpenPort("3000");
+
+                # Run the API tests.
+                $machine->mustSucceed("su - hydra -c 'perl -I ${pkgs.hydra.perlDeps}/lib/perl5/site_perl ${./tests/api-test.pl}' >&2");
+              '';
+        };
+
+        tests.notifications.x86_64-linux =
+          with import (nixpkgs + "/nixos/lib/testing.nix") { system = "x86_64-linux"; };
+          simpleTest {
+            machine = { pkgs, ... }: {
+              imports = [ hydraServer ];
+              services.hydra-dev.extraConfig = ''
+                <influxdb>
+                  url = http://127.0.0.1:8086
+                  db = hydra
+                </influxdb>
+              '';
+              services.influxdb.enable = true;
+            };
+            testScript = ''
+              $machine->waitForJob("hydra-init");
+
+              # Create an admin account and some other state.
+              $machine->succeed
+                  ( "su - hydra -c \"hydra-create-user root --email-address 'alice\@example.org' --password foobar --role admin\""
+                  , "mkdir /run/jobset"
+                  , "chmod 755 /run/jobset"
+                  , "cp ${./tests/api-test.nix} /run/jobset/default.nix"
+                  , "chmod 644 /run/jobset/default.nix"
+                  , "chown -R hydra /run/jobset"
+                  );
+
+              # Wait until InfluxDB can receive web requests
+              $machine->waitForJob("influxdb");
+              $machine->waitForOpenPort("8086");
+
+              # Create an InfluxDB database where hydra will write to
+              $machine->succeed(
+                "curl -XPOST 'http://127.0.0.1:8086/query' \\
+                --data-urlencode 'q=CREATE DATABASE hydra'");
+
+              # Wait until hydra-server can receive HTTP requests
+              $machine->waitForJob("hydra-server");
+              $machine->waitForOpenPort("3000");
+
+              # Setup the project and jobset
+              $machine->mustSucceed(
+                "su - hydra -c 'perl -I ${pkgs.hydra.perlDeps}/lib/perl5/site_perl ${./tests/setup-notifications-jobset.pl}' >&2");
+
+              # Wait until hydra has build the job and
+              # the InfluxDBNotification plugin uploaded its notification to InfluxDB
+              $machine->waitUntilSucceeds(
+                "curl -s -H 'Accept: application/csv' \\
+                -G 'http://127.0.0.1:8086/query?db=hydra' \\
+                --data-urlencode 'q=SELECT * FROM hydra_build_status' | grep success");
+            '';
+        };
+
+        container = nixosConfigurations.container.config.system.build.toplevel;
+      };
+
+      checks.x86_64-linux.build = hydraJobs.build.x86_64-linux;
+      checks.x86_64-linux.install = hydraJobs.tests.install.x86_64-linux;
+
+      packages.x86_64-linux.hydra = pkgs.hydra;
+      defaultPackage.x86_64-linux = pkgs.hydra;
+
+      nixosModules.hydra = {
+        imports = [ ./hydra-module.nix ];
+        nixpkgs.overlays = [ self.overlay nix.overlay ];
+      };
+
+      nixosModules.hydraTest = {
+        imports = [ self.nixosModules.hydra ];
+
+        services.hydra-dev.enable = true;
+        services.hydra-dev.hydraURL = "http://hydra.example.org";
+        services.hydra-dev.notificationSender = "admin@hydra.example.org";
+
+        systemd.services.hydra-send-stats.enable = false;
+
+        services.postgresql.enable = true;
+        services.postgresql.package = pkgs.postgresql95;
+
+        # The following is to work around the following error from hydra-server:
+        #   [error] Caught exception in engine "Cannot determine local time zone"
+        time.timeZone = "UTC";
+
+        nix.extraOptions = ''
+          allowed-uris = https://github.com/
+        '';
+      };
+
+      nixosModules.hydraProxy = {
+        services.httpd = {
+          enable = true;
+          adminAddr = "hydra-admin@example.org";
+          extraConfig = ''
+            <Proxy *>
+              Order deny,allow
+              Allow from all
+            </Proxy>
+
+            ProxyRequests     Off
+            ProxyPreserveHost On
+            ProxyPass         /apache-errors !
+            ErrorDocument 503 /apache-errors/503.html
+            ProxyPass         /       http://127.0.0.1:3000/ retry=5 disablereuse=on
+            ProxyPassReverse  /       http://127.0.0.1:3000/
+          '';
+        };
+      };
+
+      nixosConfigurations.container = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules =
+          [ self.nixosModules.hydraTest
+            self.nixosModules.hydraProxy
+            { system.configurationRevision = self.rev;
+
+              boot.isContainer = true;
+              networking.useDHCP = false;
+              networking.firewall.allowedTCPPorts = [ 80 ];
+              networking.hostName = "hydra";
+
+              services.hydra-dev.useSubstitutes = true;
+            }
+          ];
+      };
+
+    };
+}
--- a/hydra-module.nix
+++ b/hydra-module.nix
@ -64,7 +64,7 @@ in

      package = mkOption {
        type = types.path;
-        #default = pkgs.hydra;
+        default = pkgs.hydra;
        description = "The Hydra package.";
      };

@ -218,8 +218,6 @@ in

    nix.trustedUsers = [ "hydra-queue-runner" ];

-    services.hydra-dev.package = mkDefault ((import ./release.nix {}).build.x86_64-linux);
-
    services.hydra-dev.extraConfig =
      ''
        using_frontend_proxy = 1
--- a/release.nix
+++ b/release.nix
@ -1,333 +0,0 @@
-{ hydraSrc ? builtins.fetchGit ./.
-, nixpkgs ? builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/release-19.09.tar.gz
-, officialRelease ? false
-, shell ? false
-}:
-
-with import (nixpkgs + "/lib");
-
-let
-
-  pkgs = import nixpkgs {};
-
-  genAttrs' = genAttrs [ "x86_64-linux" /* "i686-linux" */ ];
-
-  hydraServer = hydraPkg:
-    { config, pkgs, ... }:
-    { imports = [ ./hydra-module.nix ];
-
-      virtualisation.memorySize = 1024;
-      virtualisation.writableStore = true;
-
-      services.hydra-dev.enable = true;
-      services.hydra-dev.package = hydraPkg;
-      services.hydra-dev.hydraURL = "http://hydra.example.org";
-      services.hydra-dev.notificationSender = "admin@hydra.example.org";
-
-      services.postgresql.enable = true;
-      services.postgresql.package = pkgs.postgresql95;
-
-      environment.systemPackages = [ pkgs.perlPackages.LWP pkgs.perlPackages.JSON ];
-
-      # The following is to work around the following error from hydra-server:
-      #   [error] Caught exception in engine "Cannot determine local time zone"
-      time.timeZone = "UTC";
-
-      nix = {
-        # The following is to work around: https://github.com/NixOS/hydra/pull/432
-        buildMachines = [
-          { hostName = "localhost";
-            system = "x86_64-linux";
-          }
-        ];
-        # Without this nix tries to fetch packages from the default
-        # cache.nixos.org which is not reachable from this sandboxed NixOS test.
-        binaryCaches = [];
-      };
-    };
-
-  version = builtins.readFile ./version + "." + toString hydraSrc.revCount + "." + hydraSrc.rev;
-
-in
-
-rec {
-
-  build = genAttrs' (system:
-    let pkgs = import nixpkgs { inherit system; }; in
-
-    with pkgs;
-
-    let
-
-      nix = pkgs.nixUnstable or pkgs.nix;
-
-      perlDeps = buildEnv {
-        name = "hydra-perl-deps";
-        paths = with perlPackages;
-          [ ModulePluggable
-            CatalystActionREST
-            CatalystAuthenticationStoreDBIxClass
-            CatalystDevel
-            CatalystDispatchTypeRegex
-            CatalystPluginAccessLog
-            CatalystPluginAuthorizationRoles
-            CatalystPluginCaptcha
-            CatalystPluginSessionStateCookie
-            CatalystPluginSessionStoreFastMmap
-            CatalystPluginStackTrace
-            CatalystPluginUnicodeEncoding
-            CatalystTraitForRequestProxyBase
-            CatalystViewDownload
-            CatalystViewJSON
-            CatalystViewTT
-            CatalystXScriptServerStarman
-            CatalystXRoleApplicator
-            CryptRandPasswd
-            DBDPg
-            DBDSQLite
-            DataDump
-            DateTime
-            DigestSHA1
-            EmailMIME
-            EmailSender
-            FileSlurp
-            IOCompress
-            IPCRun
-            JSON
-            JSONAny
-            JSONXS
-            LWP
-            LWPProtocolHttps
-            NetAmazonS3
-            NetPrometheus
-            NetStatsd
-            PadWalker
-            Readonly
-            SQLSplitStatement
-            SetScalar
-            Starman
-            SysHostnameLong
-            TermSizeAny
-            TestMore
-            TextDiff
-            TextTable
-            XMLSimple
-            nix
-            nix.perl-bindings
-            git
-            boehmgc
-          ];
-      };
-
-    in
-
-    releaseTools.nixBuild {
-      name = "hydra-${version}";
-
-      src = if shell then null else hydraSrc;
-
-      buildInputs =
-        [ makeWrapper autoconf automake libtool unzip nukeReferences pkgconfig sqlite libpqxx
-          gitAndTools.topGit mercurial darcs subversion bazaar openssl bzip2 libxslt
-          perlDeps perl nix
-          postgresql95 # for running the tests
-          boost
-          (nlohmann_json.override { multipleHeaders = true; })
-        ];
-
-      hydraPath = lib.makeBinPath (
-        [ sqlite subversion openssh nix coreutils findutils pixz
-          gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused bazaar
-        ] ++ lib.optionals stdenv.isLinux [ rpm dpkg cdrkit ] );
-
-      postUnpack = optionalString (!shell) ''
-        # Clean up when building from a working tree.
-        (cd $sourceRoot && (git ls-files -o --directory | xargs -r rm -rfv)) || true
-      '';
-
-      configureFlags = [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];
-
-      shellHook = ''
-        PATH=$(pwd)/src/hydra-evaluator:$(pwd)/src/script:$(pwd)/src/hydra-eval-jobs:$(pwd)/src/hydra-queue-runner:$PATH
-        ${lib.optionalString shell "PERL5LIB=$(pwd)/src/lib:$PERL5LIB"}
-      '';
-
-      preConfigure = "autoreconf -vfi";
-
-      NIX_LDFLAGS = [ "-lpthread" ];
-
-      enableParallelBuilding = true;
-
-      preCheck = ''
-        patchShebangs .
-        export LOGNAME=''${LOGNAME:-foo}
-      '';
-
-      postInstall = ''
-        mkdir -p $out/nix-support
-
-        for i in $out/bin/*; do
-            read -n 4 chars < $i
-            if [[ $chars =~ ELF ]]; then continue; fi
-            wrapProgram $i \
-                --prefix PERL5LIB ':' $out/libexec/hydra/lib:$PERL5LIB \
-                --prefix PATH ':' $out/bin:$hydraPath \
-                --set HYDRA_RELEASE ${version} \
-                --set HYDRA_HOME $out/libexec/hydra \
-                --set NIX_RELEASE ${nix.name or "unknown"}
-        done
-      ''; # */
-
-      dontStrip = true;
-
-      meta.description = "Build of Hydra on ${system}";
-      passthru.perlDeps = perlDeps;
-    });
-
-  manual = pkgs.runCommand "hydra-manual-${version}"
-    { build = build.x86_64-linux;
-    }
-    ''
-      mkdir -p $out/share
-      cp -prvd $build/share/doc $out/share/
-
-      mkdir $out/nix-support
-      echo "doc manual $out/share/doc/hydra" >> $out/nix-support/hydra-build-products
-    '';
-
-  tests.install = genAttrs' (system:
-    with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; };
-    simpleTest {
-      machine = hydraServer build.${system};
-      testScript =
-        ''
-          $machine->waitForJob("hydra-init");
-          $machine->waitForJob("hydra-server");
-          $machine->waitForJob("hydra-evaluator");
-          $machine->waitForJob("hydra-queue-runner");
-          $machine->waitForOpenPort("3000");
-          $machine->succeed("curl --fail http://localhost:3000/");
-        '';
-    });
-
-  tests.api = genAttrs' (system:
-    with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; };
-    simpleTest {
-      machine = hydraServer build.${system};
-      testScript =
-        let dbi = "dbi:Pg:dbname=hydra;user=root;"; in
-        ''
-          $machine->waitForJob("hydra-init");
-
-          # Create an admin account and some other state.
-          $machine->succeed
-              ( "su - hydra -c \"hydra-create-user root --email-address 'alice\@example.org' --password foobar --role admin\""
-              , "mkdir /run/jobset /tmp/nix"
-              , "chmod 755 /run/jobset /tmp/nix"
-              , "cp ${./tests/api-test.nix} /run/jobset/default.nix"
-              , "chmod 644 /run/jobset/default.nix"
-              , "chown -R hydra /run/jobset /tmp/nix"
-              );
-
-          $machine->succeed("systemctl stop hydra-evaluator hydra-queue-runner");
-          $machine->waitForJob("hydra-server");
-          $machine->waitForOpenPort("3000");
-
-          # Run the API tests.
-          $machine->mustSucceed("su - hydra -c 'perl -I ${build.${system}.perlDeps}/lib/perl5/site_perl ${./tests/api-test.pl}' >&2");
-        '';
-  });
-
-  tests.notifications = genAttrs' (system:
-    with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; };
-    simpleTest {
-      machine = { pkgs, ... }: {
-        imports = [ (hydraServer build.${system}) ];
-        services.hydra-dev.extraConfig = ''
-          <influxdb>
-            url = http://127.0.0.1:8086
-            db = hydra
-          </influxdb>
-        '';
-        services.influxdb.enable = true;
-      };
-      testScript = ''
-        $machine->waitForJob("hydra-init");
-
-        # Create an admin account and some other state.
-        $machine->succeed
-            ( "su - hydra -c \"hydra-create-user root --email-address 'alice\@example.org' --password foobar --role admin\""
-            , "mkdir /run/jobset"
-            , "chmod 755 /run/jobset"
-            , "cp ${./tests/api-test.nix} /run/jobset/default.nix"
-            , "chmod 644 /run/jobset/default.nix"
-            , "chown -R hydra /run/jobset"
-            );
-
-        # Wait until InfluxDB can receive web requests
-        $machine->waitForJob("influxdb");
-        $machine->waitForOpenPort("8086");
-
-        # Create an InfluxDB database where hydra will write to
-        $machine->succeed(
-          "curl -XPOST 'http://127.0.0.1:8086/query' \\
-          --data-urlencode 'q=CREATE DATABASE hydra'");
-
-        # Wait until hydra-server can receive HTTP requests
-        $machine->waitForJob("hydra-server");
-        $machine->waitForOpenPort("3000");
-
-        # Setup the project and jobset
-        $machine->mustSucceed(
-          "su - hydra -c 'perl -I ${build.${system}.perlDeps}/lib/perl5/site_perl ${./tests/setup-notifications-jobset.pl}' >&2");
-
-        # Wait until hydra has build the job and
-        # the InfluxDBNotification plugin uploaded its notification to InfluxDB
-        $machine->waitUntilSucceeds(
-          "curl -s -H 'Accept: application/csv' \\
-          -G 'http://127.0.0.1:8086/query?db=hydra' \\
-          --data-urlencode 'q=SELECT * FROM hydra_build_status' | grep success");
-      '';
-  });
-
-  /*
-  tests.s3backup = genAttrs' (system:
-    with import (nixpkgs + "/nixos/lib/testing.nix") { inherit system; };
-    let hydra = build.${system}
-    simpleTest {
-      machine =
-        { config, pkgs, ... }:
-        { services.postgresql.enable = true;
-          services.postgresql.package = pkgs.postgresql95;
-          environment.systemPackages = [ hydra pkgs.rubyLibs.fakes3 ];
-          virtualisation.memorySize = 2047;
-          boot.kernelPackages = pkgs.linuxPackages_3_10;
-          virtualisation.writableStore = true;
-          networking.extraHosts = ''
-            127.0.0.1 hydra.s3.amazonaws.com
-          '';
-        };
-
-      testScript =
-        ''
-          $machine->waitForJob("postgresql");
-
-          # Initialise the database and the state.
-          $machine->succeed
-              ( "createdb -O root hydra"
-              , "psql hydra -f ${hydra}/libexec/hydra/sql/hydra-postgresql.sql"
-              , "mkdir /var/lib/hydra"
-              , "mkdir /tmp/jobs"
-              , "cp ${./tests/s3-backup-test.pl} /tmp/s3-backup-test.pl"
-              , "cp ${./tests/api-test.nix} /tmp/jobs/default.nix"
-              );
-
-          # start fakes3
-          $machine->succeed("fakes3 --root /tmp/s3 --port 80 &>/dev/null &");
-          $machine->waitForOpenPort("80");
-
-          $machine->succeed("cd /tmp && LOGNAME=root AWS_ACCESS_KEY_ID=foo AWS_SECRET_ACCESS_KEY=bar HYDRA_DBI='dbi:Pg:dbname=hydra;user=root;' HYDRA_CONFIG=${./tests/s3-backup-test.config} perl -I ${hydra}/libexec/hydra/lib -I ${hydra.perlDeps}/lib/perl5/site_perl ./s3-backup-test.pl >&2");
-        '';
-  });
-  */
-}
--- a/shell.nix
+++ b/shell.nix
@ -1 +1,3 @@
-(import ./release.nix { shell = true; }).build.x86_64-linux
+(import (fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = builtins.fetchGit ./.;
+}).shellNix
--- a/src/hydra-eval-jobs/hydra-eval-jobs.cc
+++ b/src/hydra-eval-jobs/hydra-eval-jobs.cc
@ -9,6 +9,8 @@
 #include "get-drvs.hh"
 #include "globals.hh"
 #include "common-eval-args.hh"
+#include "flake/flakeref.hh"
+#include "flake/flake.hh"
 #include "attr-path.hh"
 #include "derivations.hh"

@ -28,6 +30,7 @@ static size_t maxMemorySize;
 struct MyArgs : MixEvalArgs, MixCommonArgs
 {
    Path releaseExpr;
+    bool flake = false;
    bool dryRun = false;

    MyArgs() : MixCommonArgs("hydra-eval-jobs")
@ -51,6 +54,11 @@ struct MyArgs : MixEvalArgs, MixCommonArgs
            .description("don't create store derivations")
            .set(&dryRun, true);

+        mkFlag()
+            .longName("flake")
+            .description("build a flake")
+            .set(&flake, true);
+
        expectArg("expr", &releaseExpr);
    }
 };
@ -89,7 +97,37 @@ static void worker(
    AutoCloseFD & from)
 {
    Value vTop;
+
+    if (myArgs.flake) {
+        using namespace flake;
+
+        auto flakeRef = parseFlakeRef(myArgs.releaseExpr);
+
+        auto vFlake = state.allocValue();
+
+        auto lockedFlake = lockFlake(state, flakeRef,
+            LockFlags {
+                .updateLockFile = false,
+                .useRegistries = false,
+                .allowMutable = false,
+            });
+
+        callFlake(state, lockedFlake, *vFlake);
+
+        auto vOutputs = vFlake->attrs->get(state.symbols.create("outputs"))->value;
+        state.forceValue(*vOutputs);
+
+        auto aHydraJobs = vOutputs->attrs->get(state.symbols.create("hydraJobs"));
+        if (!aHydraJobs)
+            aHydraJobs = vOutputs->attrs->get(state.symbols.create("checks"));
+        if (!aHydraJobs)
+            throw Error("flake '%s' does not provide any Hydra jobs or checks", flakeRef);
+
+        vTop = *aHydraJobs->value;
+
+    } else {
        state.evalFile(lookupFileArg(state, myArgs.releaseExpr), vTop);
+    }

    auto vRoot = state.allocValue();
    state.autoCallFunction(autoArgs, vTop, *vRoot);
@ -109,7 +147,7 @@ static void worker(
        nlohmann::json reply;

        try {
-            auto vTmp = findAlongAttrPath(state, attrPath, autoArgs, *vRoot);
+            auto vTmp = findAlongAttrPath(state, attrPath, autoArgs, *vRoot).first;

            auto v = state.allocValue();
            state.autoCallFunction(autoArgs, *vTmp, *v);
@ -139,23 +177,23 @@ static void worker(

                /* If this is an aggregate, then get its constituents. */
                auto a = v->attrs->get(state.symbols.create("_hydraAggregate"));
-                if (a && state.forceBool(*(*a)->value, *(*a)->pos)) {
+                if (a && state.forceBool(*a->value, *a->pos)) {
                    auto a = v->attrs->get(state.symbols.create("constituents"));
                    if (!a)
                        throw EvalError("derivation must have a ‘constituents’ attribute");


                    PathSet context;
-                    state.coerceToString(*(*a)->pos, *(*a)->value, context, true, false);
+                    state.coerceToString(*a->pos, *a->value, context, true, false);
                    for (auto & i : context)
                        if (i.at(0) == '!') {
                            size_t index = i.find("!", 1);
                            job["constituents"].push_back(string(i, index + 1));
                        }

-                    state.forceList(*(*a)->value, *(*a)->pos);
-                    for (unsigned int n = 0; n < (*a)->value->listSize(); ++n) {
-                        auto v = (*a)->value->listElems()[n];
+                    state.forceList(*a->value, *a->pos);
+                    for (unsigned int n = 0; n < a->value->listSize(); ++n) {
+                        auto v = a->value->listElems()[n];
                        state.forceValue(*v);
                        if (v->type == tString)
                            job["namedConstituents"].push_back(state.forceStringNoCtx(*v));
@ -245,6 +283,10 @@ int main(int argc, char * * argv)
           to the environment. */
        evalSettings.restrictEval = true;

+        /* When building a flake, use pure evaluation (no access to
+           'getEnv', 'currentSystem' etc. */
+        evalSettings.pureEval = myArgs.flake;
+
        if (myArgs.dryRun) settings.readOnlyMode = true;

        if (myArgs.releaseExpr == "") throw UsageError("no expression specified");
--- a/src/hydra-evaluator/hydra-evaluator.cc
+++ b/src/hydra-evaluator/hydra-evaluator.cc
@ -103,7 +103,7 @@ struct Evaluator
        }

        if (evalOne && seen.empty()) {
-            printError("the specified jobset does not exist");
+            printError("the specified jobset does not exist or is disabled");
            std::_Exit(1);
        }

@ -458,14 +458,15 @@ int main(int argc, char * * argv)
            return true;
        });

+
+        if (unlock)
+            evaluator.unlock();
+        else {
            if (!args.empty()) {
                if (args.size() != 2) throw UsageError("Syntax: hydra-evaluator [<project> <jobset>]");
                evaluator.evalOne = JobsetName(args[0], args[1]);
            }
-
-        if (unlock)
-            evaluator.unlock();
-        else
            evaluator.run();
+        }
    });
 }
--- a/src/lib/Hydra/Controller/Jobset.pm
+++ b/src/lib/Hydra/Controller/Jobset.pm
@ -223,7 +223,19 @@ sub updateJobset {
    error($c, "Cannot rename jobset to ‘$jobsetName’ since that identifier is already taken.")
        if $jobsetName ne $oldName && defined $c->stash->{project}->jobsets->find({ name => $jobsetName });

-    my ($nixExprPath, $nixExprInput) = nixExprPathFromParams $c;
+    my $type = int($c->stash->{params}->{"type"}) // 0;
+
+    my ($nixExprPath, $nixExprInput);
+    my $flake;
+
+    if ($type == 0) {
+        ($nixExprPath, $nixExprInput) = nixExprPathFromParams $c;
+    } elsif ($type == 1) {
+        $flake = trim($c->stash->{params}->{"flakeref"});
+        error($c, "Invalid flake URI ‘$flake’.") if $flake !~ /^[a-zA-Z]/;
+    } else {
+        error($c, "Invalid jobset type.");
+    }

    my $enabled = int($c->stash->{params}->{enabled});
    die if $enabled < 0 || $enabled > 3;
@ -246,6 +258,8 @@ sub updateJobset {
        , checkinterval => $checkinterval
        , triggertime => ($enabled && $checkinterval > 0) ? $jobset->triggertime // time() : undef
        , schedulingshares => $shares
+        , type => $type
+        , flake => $flake
        });

    $jobset->project->jobsetrenames->search({ from_ => $jobsetName })->delete;
@ -255,6 +269,7 @@ sub updateJobset {
    # Set the inputs of this jobset.
    $jobset->jobsetinputs->delete;

+    if ($type == 0) {
        foreach my $name (keys %{$c->stash->{params}->{inputs}}) {
            my $inputData = $c->stash->{params}->{inputs}->{$name};
            my $type = $inputData->{type};
@ -274,6 +289,7 @@ sub updateJobset {
            $input->jobsetinputalts->create({altnr => 0, value => $value});
        }
    }
+}


 sub clone : Chained('jobsetChain') PathPart('clone') Args(0) {
--- a/src/lib/Hydra/Helper/AddBuilds.pm
+++ b/src/lib/Hydra/Helper/AddBuilds.pm
@ -30,6 +30,8 @@ sub updateDeclarativeJobset {
    my @allowed_keys = qw(
        enabled
        hidden
+        type
+        flake
        description
        nixexprinput
        nixexprpath
--- a/src/root/build.tt
+++ b/src/root/build.tt
@ -120,7 +120,7 @@ END;
      <b class="caret"></b>
    </a>
    <ul class="dropdown-menu">
-      [% IF build.nixexprinput %]
+      [% IF build.nixexprinput || eval.flake %]
        <li><a href="#reproduce" data-toggle="modal">Reproduce locally</a></li>
      [% END %]
      [% IF c.user_exists %]
@ -530,18 +530,33 @@ END;

  <div class="modal-body">

-    <p>You can reproduce this build on your own machine by downloading
-    <a [% HTML.attributes(href => url) %]>a script</a> that checks out
-    all inputs of the build and then invokes Nix to perform the build.
-    This script requires that you have Nix on your system.</p>
+    [% IF eval.flake %]
+
+    <p>If you have <a href='https://nixos.org/nix/download.html'>Nix
+    installed</a>, you can reproduce this build on your own machine by
+    running the following command:</p>
+
+<pre>
+<span class="shell-prompt"># </span>nix build [% HTML.escape(eval.flake) %]#hydraJobs.[% HTML.escape(job.name) %]
+</pre>
+
+    [% ELSE %]
+
+    <p>If you have <a href='https://nixos.org/nix/download.html'>Nix
+    installed</a>, you can reproduce this build on your own machine by
+    downloading <a [% HTML.attributes(href => url) %]>a script</a>
+    that checks out all inputs of the build and then invokes Nix to
+    perform the build.</p>

    <p>To download and execute the script from the command line, run the
    following command:</p>

 <pre>
-<span class="shell-prompt">$ </span>curl <a [% HTML.attributes(href => url) %]>[% HTML.escape(url) %]</a> | bash
+<span class="shell-prompt"># </span>curl <a [% HTML.attributes(href => url) %]>[% HTML.escape(url) %]</a> | bash
 </pre>

+    [% END %]
+
  </div>

  <div class="modal-footer">
--- a/src/root/edit-jobset.tt
+++ b/src/root/edit-jobset.tt
@ -42,7 +42,7 @@
 [% END %]

 [% BLOCK renderJobsetInputs %]
-  <table class="table table-striped table-condensed">
+  <table class="table table-striped table-condensed show-on-legacy">
    <thead>
      <tr><th></th><th>Input name</th><th>Type</th><th style="width: 50%">Value</th><th>Notify committers</th></tr>
    </thead>
@ -97,6 +97,24 @@
    </div>

    <div class="control-group">
+      <label class="control-label">Type</label>
+      <div class="controls">
+        <div class="btn-group" data-toggle="buttons-radio">
+          <input type="hidden" id="type" name="type" value="[% jobset.type %]" />
+          <button type="button" class="btn" value="1" id="type-flake">Flake</button>
+          <button type="button" class="btn" value="0" id="type-legacy">Legacy</button>
+        </div>
+      </div>
+    </div>
+
+    <div class="control-group show-on-flake">
+      <label class="control-label">Flake URI</label>
+      <div class="controls">
+        <input type="text" class="span3" name="flakeref" [% HTML.attributes(value => jobset.flake) %]/>
+      </div>
+    </div>
+
+    <div class="control-group show-on-legacy">
      <label class="control-label">Nix expression</label>
      <div class="controls">
        <input type="text" class="span3" name="nixexprpath" [% HTML.attributes(value => jobset.nixexprpath) %]/>
@ -168,6 +186,21 @@
  $(document).ready(function() {
    var id = 0;

+    function update() {
+      if ($("#type").val() == 0) {
+        $(".show-on-legacy").show();
+        $(".show-on-flake").hide();
+      } else {
+        $(".show-on-legacy").hide();
+        $(".show-on-flake").show();
+      }
+    }
+
+    $("#type-flake").click(function() { update(); });
+    $("#type-legacy").click(function() { update(); });
+
+    update();
+
    $(".add-input").click(function() {
      var newid = "input-" + id++;
      var x = $("#input-template").clone(true).attr("id", "").insertBefore($(this).parents("tr")).show();
--- a/src/root/edit-project.tt
+++ b/src/root/edit-project.tt
@ -8,7 +8,7 @@
    <div class="control-group">
      <div class="controls">
        <label class="checkbox">
-          <input type="checkbox" name="enabled" [% IF project.enabled; 'checked="checked"'; END %]/>Enabled
+          <input type="checkbox" name="enabled" [% IF create || project.enabled; 'checked="checked"'; END %]/>Enabled
        </label>
      </div>
      <div class="controls">
--- a/src/root/jobset-eval.tt
+++ b/src/root/jobset-eval.tt
@ -18,7 +18,8 @@
  </ul>
 </div>

-<p>This evaluation was performed on [% INCLUDE renderDateTime
+<p>This evaluation was performed [% IF eval.flake %]from the flake
+<tt>[%HTML.escape(eval.flake)%]</tt>[%END%] on [% INCLUDE renderDateTime
 timestamp=eval.timestamp %]. Fetching the dependencies took [%
 eval.checkouttime %]s and evaluation took [% eval.evaltime %]s.</p>

--- a/src/root/jobset.tt
+++ b/src/root/jobset.tt
@ -135,6 +135,15 @@
        <th>Description:</th>
        <td>[% HTML.escape(jobset.description) %]</td>
      </tr>
+      [% IF jobset.type == 1 %]
+      <tr>
+        <th>Flake URI:</th>
+        <td>
+          <tt>[% HTML.escape(jobset.flake) %]</tt>
+        </td>
+      </tr>
+      [% END %]
+      [% IF jobset.type == 0 %]
      <tr>
        <th>Nix expression:</th>
        <td>
@ -142,6 +151,7 @@
          <tt>[% HTML.escape(jobset.nixexprinput) %]</tt>
        </td>
      </tr>
+      [% END %]
      <tr>
        <th>Check interval:</th>
        <td>[% jobset.checkinterval || "<em>disabled</em>"  %]</td>
@ -166,7 +176,9 @@
      </tr>
    </table>

+    [% IF jobset.type == 0 %]
    [% INCLUDE renderJobsetInputs %]
+    [% END %]
  </div>

  [% INCLUDE makeLazyTab tabName="tabs-jobs" uri=c.uri_for('/jobset' project.name jobset.name "jobs-tab") %]
--- a/src/script/hydra-eval-jobset
+++ b/src/script/hydra-eval-jobset
@ -328,16 +328,25 @@ sub inputsToArgs {


 sub evalJobs {
-    my ($inputInfo, $nixExprInputName, $nixExprPath) = @_;
+    my ($inputInfo, $nixExprInputName, $nixExprPath, $flakeRef) = @_;

+    my @cmd;
+
+    if (defined $flakeRef) {
+        @cmd = ("hydra-eval-jobs",
+                "--flake", $flakeRef,
+                "--gc-roots-dir", getGCRootsDir,
+                "--max-jobs", 1);
+    } else {
        my $nixExprInput = $inputInfo->{$nixExprInputName}->[0]
            or die "cannot find the input containing the job expression\n";

-    my @cmd = ("hydra-eval-jobs",
+        @cmd = ("hydra-eval-jobs",
                "<" . $nixExprInputName . "/" . $nixExprPath . ">",
                "--gc-roots-dir", getGCRootsDir,
-               "-j", 1,
+                "--max-jobs", 1,
                inputsToArgs($inputInfo));
+    }

    if (defined $ENV{'HYDRA_DEBUG'}) {
        sub escape {
@ -356,7 +365,7 @@ sub evalJobs {

    print STDERR "$stderr";

-    return (decode_json($jobsJSON), $nixExprInput);
+    return decode_json($jobsJSON);
 }


@ -374,7 +383,7 @@ sub getPrevJobsetEval {

 # Check whether to add the build described by $buildInfo.
 sub checkBuild {
-    my ($db, $jobset, $inputInfo, $nixExprInput, $buildInfo, $buildMap, $prevEval, $jobOutPathMap, $plugins) = @_;
+    my ($db, $jobset, $inputInfo, $buildInfo, $buildMap, $prevEval, $jobOutPathMap, $plugins) = @_;

    my @outputNames = sort keys %{$buildInfo->{outputs}};
    die unless scalar @outputNames;
@ -577,6 +586,16 @@ sub checkJobsetWrapped {
    };
    my $fetchError = $@;

+    my $flakeRef = $jobset->flake;
+    if (defined $flakeRef) {
+        (my $res, my $json, my $stderr) = captureStdoutStderr(
+            600, "nix", "flake", "info", "--tarball-ttl", 0, "--json", "--", $flakeRef);
+        die "'nix flake info' returned " . ($res & 127 ? "signal $res" : "exit code " . ($res >> 8))
+            . ":\n" . ($stderr ? decode("utf-8", $stderr) : "(no output)\n")
+            if $res;
+        $flakeRef = decode_json($json)->{'url'};
+    }
+
    Net::Statsd::increment("hydra.evaluator.checkouts");
    my $checkoutStop = clock_gettime(CLOCK_MONOTONIC);
    Net::Statsd::timing("hydra.evaluator.checkout_time", int(($checkoutStop - $checkoutStart) * 1000));
@ -597,7 +616,7 @@ sub checkJobsetWrapped {
    my @args = ($jobset->nixexprinput, $jobset->nixexprpath, inputsToArgs($inputInfo));
    my $argsHash = sha256_hex("@args");
    my $prevEval = getPrevJobsetEval($db, $jobset, 0);
-    if (defined $prevEval && $prevEval->hash eq $argsHash && !$dryRun && !$jobset->forceeval) {
+    if (defined $prevEval && $prevEval->hash eq $argsHash && !$dryRun && !$jobset->forceeval && $prevEval->flake eq $flakeRef) {
        print STDERR "  jobset is unchanged, skipping\n";
        Net::Statsd::increment("hydra.evaluator.unchanged_checkouts");
        txn_do($db, sub {
@ -609,7 +628,7 @@ sub checkJobsetWrapped {

    # Evaluate the job expression.
    my $evalStart = clock_gettime(CLOCK_MONOTONIC);
-    my ($jobs, $nixExprInput) = evalJobs($inputInfo, $jobset->nixexprinput, $jobset->nixexprpath);
+    my $jobs = evalJobs($inputInfo, $jobset->nixexprinput, $jobset->nixexprpath, $flakeRef);
    my $evalStop = clock_gettime(CLOCK_MONOTONIC);

    if ($jobsetsJobset) {
@ -654,7 +673,7 @@ sub checkJobsetWrapped {
        foreach my $job (permute(values %{$jobs})) {
            next if defined $job->{error};
            #print STDERR "considering job " . $project->name, ":", $jobset->name, ":", $job->{jobName} . "\n";
-            checkBuild($db, $jobset, $inputInfo, $nixExprInput, $job, \%buildMap, $prevEval, $jobOutPathMap, $plugins);
+            checkBuild($db, $jobset, $inputInfo, $job, \%buildMap, $prevEval, $jobOutPathMap, $plugins);
        }

        # Have any builds been added or removed since last time?
@ -669,6 +688,7 @@ sub checkJobsetWrapped {
            , evaltime => abs(int($evalStop - $evalStart))
            , hasnewbuilds => $jobsetChanged ? 1 : 0
            , nrbuilds => $jobsetChanged ? scalar(keys %buildMap) : undef
+            , flake => $flakeRef
            });

        $db->storage->dbh->do("notify eval_added, ?", undef,