Switch from BIOS and GRUB to UEFI and systemd-boot for Proxmox VMs

config/proxmox-vm/boot.nix

@@ -2,8 +2,9 @@
 # Sources for this configuration:
 # - a generated NixOS 23.05 configuration
 # - https://github.com/NixOS/nixpkgs/blob/069de7d3deafab651fd627c8f6d7e4c7b33087a2/nixos/modules/virtualisation/proxmox-image.nix#L241
+# - https://nixos.org/manual/nixos/stable/#sec-installation-manual-installing
 
-{ config, pkgs, ... }:
+{ config, pkgs, lib, ... }:
 
 {
   boot = {
@@ -12,19 +13,20 @@
     # Not specified here:
     # - boot.kernelModules
     # - boot.extraModulePackages
-    # Please specify as needed.
-    
+    # Please specify as needed elsewhere.
+
     # Grow the root partition on boot.
     growPartition = true;
 
     kernelParams = [ "console=ttyS0" ];
 
-    loader.grub = {
+    loader.systemd-boot = {
       enable = true;
-      # TODO: Can we use "/dev/disk/by-label/nixos" here?
-      device = "/dev/vda";
+      editor = false;
     };
 
-    loader.timeout = 0;
+    loader.efi.efiSysMountPoint = "/boot";
+
+    loader.timeout = lib.mkForce 2;
   };
 }

config/proxmox-vm/storage.nix

@@ -12,6 +12,11 @@
     fsType = "ext4";
   };
 
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-label/ESP";
+    fsType = "vfat";
+  };
+
   # Not specified here:
   # - swapDevices
   # If needed, manually specify it elsewhere.