stage-1: Only copy mdadm and mdmon into initramfs if enabled

nixos/modules/system/boot/stage-1.nix

@@ -133,10 +133,6 @@ let
       copy_bin_and_libs ${getBin pkgs.lvm2}/bin/dmsetup
       copy_bin_and_libs ${getBin pkgs.lvm2}/bin/lvm
 
-      # Add RAID mdadm tool.
-      copy_bin_and_libs ${pkgs.mdadm}/sbin/mdadm
-      copy_bin_and_libs ${pkgs.mdadm}/sbin/mdmon
-
       # Copy udev.
       copy_bin_and_libs ${udev}/bin/udevadm
       copy_bin_and_libs ${udev}/lib/systemd/systemd-sysctl
@@ -225,7 +221,6 @@ let
       $out/bin/udevadm --version
       $out/bin/dmsetup --version 2>&1 | tee -a log | grep -q "version:"
       LVM_SYSTEM_DIR=$out $out/bin/lvm version 2>&1 | tee -a log | grep -q "LVM"
-      $out/bin/mdadm --version
       ${optionalString config.services.multipath.enable ''
         ($out/bin/multipath || true) 2>&1 | grep -q 'need to be root'
         ($out/bin/multipathd || true) 2>&1 | grep -q 'need to be root'

nixos/modules/tasks/swraid.nix

@@ -44,6 +44,16 @@ in {
         cp -v ${pkgs.mdadm}/lib/udev/rules.d/*.rules $out/
       '';
 
+      extraUtilsCommands = ''
+        # Add RAID mdadm tool.
+        copy_bin_and_libs ${pkgs.mdadm}/sbin/mdadm
+        copy_bin_and_libs ${pkgs.mdadm}/sbin/mdmon
+      '';
+
+      extraUtilsCommandsTest = ''
+        $out/bin/mdadm --version
+      '';
+
       extraFiles."/etc/mdadm.conf".source = pkgs.writeText "mdadm.conf" config.boot.swraid.mdadmConf;
 
       systemd = {