Add plymouth

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/persist/default.nix

@@ -1,10 +1,35 @@
-{ inputs, lib, ... }:
+{ inputs, pkgs, ... }:
 
 {
   imports = [ inputs.impermanence.nixosModules.impermanence ];
 
+  boot.initrd.systemd =
+    let
+      bins = with pkgs; [
+        coreutils
+        util-linux
+        findutils
+        btrfs-progs
+      ];
+    in
+    {
+      initrdBin = bins;
+
+      services.impermanence = {
+        description = "Rollback BTRFS subvolumes to a pristine state";
+
+        serviceConfig.Type = "oneshot";
+        wantedBy = [ "initrd.target" ];
+        before = [ "sysroot.mount" ];
+        after = [ "cryptsetup.target" ];
+        unitConfig.DefaultDependencies = "no";
+
+        path = bins;
+        script = builtins.readFile ./impermanence.sh;
+      };
+    };
+
   fileSystems."/persist".neededForBoot = true;
-  boot.initrd.postDeviceCommands = lib.mkAfter (builtins.readFile ./impermanence.sh);
 
   environment.persistence."/persist" = {
     hideMounts = true;