add plymouth

pkgs/plymouth-spinner-monochrome/default.nix

@@ -0,0 +1,23 @@
+{
+  stdenv,
+  logo ? null,
+  lib,
+  ...
+}:
+stdenv.mkDerivation {
+  pname = "plymouth-spinner-monochrome";
+  version = "1.0";
+  src = ./src;
+
+  buildPhase = lib.optionalString (logo != null) ''
+    ln -s ${logo} watermark.png
+  '';
+  installPhase = ''
+    mkdir -p $out/share/plymouth/themes
+    cp -rT . $out/share/plymouth/themes/spinner-monochrome
+  '';
+
+  meta = {
+    platforms = lib.platforms.all;
+  };
+}

pkgs/plymouth-spinner-monochrome/src/spinner-monochrome.plymouth

@@ -0,0 +1,79 @@
+[Plymouth Theme]
+Name[be]=Круцёлка
+Name[cs]=Točítko
+Name[da]=Snurre
+Name[de]=Spinner
+Name[eo]=Turnilo
+Name[es]=Spinner
+Name[eu]=Spinner
+Name[fr]=Roulette
+Name[fur]=Roulette
+Name[hu]=Forgó
+Name[id]=Spinner
+Name[it]=Spinner
+Name[nl]=Spinner
+Name[pa]=ਸਪਿੱਨਰ
+Name[pl]=Spinner
+Name[pt_BR]=Spinner
+Name[ru]=Числовое поле с кнопками
+Name[sr]=Предилица
+Name[sv]=Spinnare
+Name[uk]=Крутний індикатор
+Name[zh_CN]=Spinner
+Name[ms]=Spinner
+Name[he]=שבשבת טעינה
+Name[fa]=چرخنده
+Name[fi]=Spinneri
+Name=Spinner
+Description=A theme designed by jimmac that features a simple spinner.
+ModuleName=two-step
+
+[two-step]
+Font=Fira Sans 12
+TitleFont=Fira Sans 30
+ImageDir=/etc/plymouth/themes/spinner-monochrome
+DialogHorizontalAlignment=.5
+DialogVerticalAlignment=.382
+TitleHorizontalAlignment=.5
+TitleVerticalAlignment=.382
+HorizontalAlignment=.5
+VerticalAlignment=.7
+WatermarkHorizontalAlignment=.5
+WatermarkVerticalAlignment=.96
+Transition=none
+TransitionDuration=0.0
+BackgroundStartColor=0x000000
+BackgroundEndColor=0x000000
+ProgressBarBackgroundColor=0x606060
+ProgressBarForegroundColor=0xffffff
+MessageBelowAnimation=true
+
+[boot-up]
+UseEndAnimation=false
+
+[shutdown]
+UseEndAnimation=false
+
+[reboot]
+UseEndAnimation=false
+
+[updates]
+SuppressMessages=true
+ProgressBarShowPercentComplete=true
+UseProgressBar=true
+Title=Installing Updates...
+SubTitle=Do not turn off your computer
+
+[system-upgrade]
+SuppressMessages=true
+ProgressBarShowPercentComplete=true
+UseProgressBar=true
+Title=Upgrading System...
+SubTitle=Do not turn off your computer
+
+[firmware-upgrade]
+SuppressMessages=true
+ProgressBarShowPercentComplete=true
+UseProgressBar=true
+Title=Upgrading Firmware...
+SubTitle=Do not turn off your computer