1 files changed, 49 insertions, 0 deletions
diff --git a/sys/boot/efi.nix b/sys/boot/efi.nix
new file mode 100644
index 0000000..71c42c8
--- /dev/null
+++ b/sys/boot/efi.nix
@@ -0,0 +1,49 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.local.boot.efi;
+in {
+  options.local.boot.efi = {
+    enable = mkEnableOption "EFI with FAT32 system partition";
+
+    esp = {
+      mountpoint = mkOption {
+        type = types.enum ["/boot" "/boot/efi"];
+        default = "/boot";
+      };
+
+      uuid = mkOption {
+        type = types.strMatching "[0-9A-F]{4}-[0-9A-F]{4}";
+      };
+    };
+
+    removable = mkOption {
+      type = types.bool;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    boot = {
+      initrd.supportedFilesystems = ["vfat"];
+
+      loader = {
+        efi = {
+          efiSysMountPoint = cfg.esp.mountpoint;
+          canTouchEfiVariables = !cfg.removable;
+        };
+
+        grub.efiInstallAsRemovable = cfg.removable;
+      };
+    };
+
+    fileSystems.${cfg.esp.mountpoint} = {
+      device = "/dev/disk/by-uuid/${cfg.esp.uuid}";
+      fsType = "vfat";
+      options = ["noatime" "umask=027" "sync"];
+      neededForBoot = true;
+    };
+  };
+}