plymouth service: init

nixos/modules/module-list.nix

@@ -522,6 +522,7 @@
   ./system/boot/luksroot.nix
   ./system/boot/modprobe.nix
   ./system/boot/networkd.nix
+  ./system/boot/plymouth.nix
   ./system/boot/resolved.nix
   ./system/boot/shutdown.nix
   ./system/boot/stage-1.nix

nixos/modules/system/boot/plymouth.nix

@@ -0,0 +1,129 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  inherit (pkgs) plymouth;
+
+  cfg = config.boot.plymouth;
+
+  themesEnv = pkgs.buildEnv {
+    name = "plymouth-themes";
+    paths = [ plymouth ] ++ cfg.themePackages;
+  };
+
+  configFile = pkgs.writeText "plymouthd.conf" ''
+    [Daemon]
+    ShowDelay=0
+    Theme=${cfg.theme}
+  '';
+
+in
+
+{
+
+  options = {
+
+    boot.plymouth = {
+
+      enable = mkEnableOption "Plymouth boot splash screen";
+
+      themePackages = mkOption {
+        default = [];
+        type = types.listOf types.package;
+        description = ''
+          Extra theme packages for plymouth.
+        '';
+      };
+
+      theme = mkOption {
+        default = "fade-in";
+        type = types.str;
+        description = ''
+          Splash screen theme.
+        '';
+      };
+
+      logo = mkOption {
+        type = types.path;
+        default = pkgs.fetchurl {
+          url = "https://nixos.org/logo/nixos-hires.png";
+          sha256 = "1ivzgd7iz0i06y36p8m5w48fd8pjqwxhdaavc0pxs7w1g7mcy5si";
+        };
+        description = ''
+          Logo which is displayed on the splash screen.
+        '';
+      };
+
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+
+    boot.kernelParams = [ "splash" ];
+
+    # To be discoverable by systemd.
+    environment.systemPackages = [ plymouth ];
+
+    environment.etc."plymouth/plymouthd.conf".source = configFile;
+    environment.etc."plymouth/plymouthd.defaults".source = "${plymouth}/share/plymouth/plymouth.defaults";
+    environment.etc."plymouth/logo.png".source = cfg.logo;
+    environment.etc."plymouth/themes".source = "${themesEnv}/share/plymouth/themes";
+    # XXX: Needed because we supply a different set of plugins in initrd.
+    environment.etc."plymouth/plugins".source = "${plymouth}/lib/plymouth";
+
+    systemd.packages = [ plymouth ];
+
+    systemd.services.plymouth-kexec.wantedBy = [ "kexec.target" ];
+    systemd.services.plymouth-halt.wantedBy = [ "halt.target" ];
+    systemd.services.plymouth-quit = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "display-manager.service" "multi-user.target" ];
+    };
+    systemd.services.plymouth-poweroff.wantedBy = [ "poweroff.target" ];
+    systemd.services.plymouth-reboot.wantedBy = [ "reboot.target" ];
+    systemd.services.plymouth-read-write.wantedBy = [ "sysinit.target" ];
+
+    boot.initrd.extraUtilsCommands = ''
+      copy_bin_and_libs ${pkgs.plymouth}/bin/plymouthd
+      copy_bin_and_libs ${pkgs.plymouth}/bin/plymouth
+
+      moduleName="$(sed -n 's,ModuleName *= *,,p' ${themesEnv}/share/plymouth/themes/${cfg.theme}/${cfg.theme}.plymouth)"
+
+      mkdir -p $out/lib/plymouth/renderers
+      cp ${plymouth}/lib/plymouth/{text,details,$moduleName}.so $out/lib/plymouth
+      cp ${plymouth}/lib/plymouth/renderers/{drm,frame-buffer}.so $out/lib/plymouth/renderers
+
+      mkdir -p $out/share/plymouth/themes
+      cp ${plymouth}/share/plymouth/plymouthd.defaults $out/share/plymouth
+      cp -r ${themesEnv}/share/plymouth/themes/{text,details,${cfg.theme}} $out/share/plymouth/themes
+      cp ${cfg.logo} $out/share/plymouth/logo.png
+    '';
+
+    boot.initrd.extraUtilsCommandsTest = ''
+      $out/bin/plymouthd --help >/dev/null
+      $out/bin/plymouth --help >/dev/null
+    '';
+
+    boot.initrd.extraUdevRulesCommands = ''
+      cp ${config.systemd.package}/lib/udev/rules.d/{70-uaccess,71-seat}.rules $out
+      sed -i '/loginctl/d' $out/71-seat.rules
+    '';
+
+    boot.initrd.preLVMCommands = mkAfter ''
+      mkdir -p /etc/plymouth
+      ln -s ${configFile} /etc/plymouth/plymouthd.conf
+      ln -s $extraUtils/share/plymouth/plymouthd.defaults /etc/plymouth/plymouthd.defaults
+      ln -s $extraUtils/share/plymouth/logo.png /etc/plymouth/logo.png
+      ln -s $extraUtils/share/plymouth/themes /etc/plymouth/themes
+      ln -s $extraUtils/lib/plymouth /etc/plymouth/plugins
+
+      plymouthd --mode=boot --pid-file=/run/plymouth/pid --attach-to-session
+      plymouth --show-splash
+    '';
+
+  };
+
+}