libstore/build: drop cgroups experimental feature

We drop it to re-introduce it via the concept of build context which
will control in which cgroup a certain build should be spawned.

Change-Id: I4b4705d768129a6d7c0f061dc2163ba116088b18
Signed-off-by: Raito Bezarius <raito@lix.systems>

tests/nixos/containers/containers.nix

@@ -18,7 +18,7 @@
           nix.settings.substituters = lib.mkForce [ ];
           nix.extraOptions =
             ''
-              extra-experimental-features = nix-command auto-allocate-uids cgroups
+              extra-experimental-features = nix-command auto-allocate-uids
               extra-system-features = uid-range
             '';
           nix.nixPath = [ "nixpkgs=${nixpkgs}" ];

tests/nixos/containers/id-test.nix

@@ -1,8 +0,0 @@
-{ name, uidRange ? false }:
-
-with import <nixpkgs> {};
-
-runCommand name
-  { requiredSystemFeatures = if uidRange then ["uid-range"] else [];
-  }
-  "id; id > $out"

tests/nixos/containers/systemd-nspawn.nix

@@ -1,80 +0,0 @@
-{ nixpkgs }:
-
-let
-
-  machine = { config, pkgs, ... }:
-    {
-      system.stateVersion = "22.05";
-      boot.isContainer = true;
-      systemd.services.console-getty.enable = false;
-      networking.dhcpcd.enable = false;
-
-      services.httpd = {
-        enable = true;
-        adminAddr = "nixos@example.org";
-      };
-
-      systemd.services.test = {
-        wantedBy = [ "multi-user.target" ];
-        after = [ "httpd.service" ];
-        script = ''
-          source /.env
-          echo "Hello World" > $out/msg
-          ls -lR /dev > $out/dev
-          ${pkgs.curl}/bin/curl -sS --fail http://localhost/ > $out/page.html
-        '';
-        unitConfig = {
-          FailureAction = "exit-force";
-          FailureActionExitStatus = 42;
-          SuccessAction = "exit-force";
-        };
-      };
-    };
-
-  cfg = (import (nixpkgs + "/nixos/lib/eval-config.nix") {
-    modules = [ machine ];
-    system = "x86_64-linux";
-  });
-
-  config = cfg.config;
-
-in
-
-with cfg._module.args.pkgs;
-
-runCommand "test"
-  { buildInputs = [ config.system.path ];
-    requiredSystemFeatures = [ "uid-range" ];
-    toplevel = config.system.build.toplevel;
-  }
-  ''
-    root=$(pwd)/root
-    mkdir -p $root $root/etc
-
-    export > $root/.env
-
-    # Make /run a tmpfs to shut up a systemd warning.
-    mkdir /run
-    mount -t tmpfs none /run
-
-    mount -t cgroup2 none /sys/fs/cgroup
-
-    mkdir -p $out
-
-    chmod +w /etc
-    touch /etc/os-release
-    echo a5ea3f98dedc0278b6f3cc8c37eeaeac > /etc/machine-id
-
-    SYSTEMD_NSPAWN_UNIFIED_HIERARCHY=1 \
-      ${config.systemd.package}/bin/systemd-nspawn \
-      --keep-unit \
-      -M ${config.networking.hostName} -D "$root" \
-      --register=no \
-      --resolv-conf=off \
-      --bind-ro=/nix/store \
-      --bind=$out \
-      --bind=/proc:/run/host/proc \
-      --bind=/sys:/run/host/sys \
-      --private-network \
-      $toplevel/init
-  ''

tests/nixos/default.nix

@@ -150,8 +150,6 @@ in
 
   tarballFlakes = runNixOSTestFor "x86_64-linux" ./tarball-flakes.nix;
 
-  containers = runNixOSTestFor "x86_64-linux" ./containers/containers.nix;
-
   setuid = lib.genAttrs
     ["i686-linux" "x86_64-linux"]
     (system: runNixOSTestFor system ./setuid/setuid.nix);