Add support for systemd-ukify

README.md

@@ -8,6 +8,7 @@ The auto-update of this script should be disabled! Make sure to create `.disable
 
 ### Dependencies
 Make sure that:
+* if running Ubuntu 24.04+, Linux Mint 22+ or Debian 13+, `systemd-ukify` is installed
 * `binutils`, `efibootmgr` and `systemd-boot-efi` packages are installed
 * you [install](https://wiki.archlinux.org/title/Unified_kernel_image#Directly_from_UEFI) the UKI to your EFI
 configuration

build-uki.sh

@@ -11,12 +11,19 @@ else
 fi
 
 # Build UKI
-$sudo objcopy \
+if [ -x /usr/bin/ukify ]; then
-  --add-section .osrel=/etc/os-release --change-section-vma .osrel=0x20000 \
+  echo "Building UKI using systemd-ukify..."
-  --add-section .cmdline="/etc/kernel/cmdline" --change-section-vma .cmdline=0x30000 \
+  $sudo ukify build --linux $path_to_vmlinuz_link/vmlinuz --initrd $path_to_vmlinuz_link/initrd.img \
-  --add-section .linux="$path_to_vmlinuz_link/vmlinuz" --change-section-vma .linux=0x40000 \
+    --cmdline @/etc/kernel/cmdline --output $path_to_uki
-  --add-section .initrd="$path_to_vmlinuz_link/initrd.img" --change-section-vma .initrd=0x3000000 \
+else
-  /usr/lib/systemd/boot/efi/linuxx64.efi.stub $path_to_uki
+  echo "Building UKI using objcopy..."
+  $sudo objcopy \
+    --add-section .osrel=/etc/os-release --change-section-vma .osrel=0x20000 \
+    --add-section .cmdline="/etc/kernel/cmdline" --change-section-vma .cmdline=0x30000 \
+    --add-section .linux="$path_to_vmlinuz_link/vmlinuz" --change-section-vma .linux=0x40000 \
+    --add-section .initrd="$path_to_vmlinuz_link/initrd.img" --change-section-vma .initrd=0x3000000 \
+    /usr/lib/systemd/boot/efi/linuxx64.efi.stub $path_to_uki
+fi
 
 # Sign UKI
 if [[ -v secureboot_enabled ]] && [[ $secureboot_enabled = "yes" ]]; then