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# arch-unified-kernel-image-hooks
* Save a backup copy of the currently-booted unified kernel image UEFI entry
* Update the unified kernel image when the microcode gets updated
## Notes
* Ensure that your EFI System Partition has enough available space to save an extra copy of each unified kernel image that you boot into.
* The tool only works on local disks, which is probably what you have. Network EFI images are not backed up.
* The tool currently supports images generated by mkinitcpio. Pull requests for other initramfs generators welcome.
## Setup
1. [Configure Unified Kernel Image creation](https://wiki.archlinux.org/title/Unified_kernel_image)
2. Install the package. (`unified-kernel-image-hooks`)
3. `systemctl enable unified-kernel-image-backup.service`
4. Add the UEFI boot entry.
Examples (change --disk, --part, and --loader as necessary):
```
efibootmgr -v --create --disk /dev/sda --part 1 --label 'Arch Linux (last booted kernel)' --loader '\EFI\ARCH\linux-x64-last.efi'
```
```
efibootmgr -v --create --disk /dev/nvme0n1 --part 1 --label 'Arch Linux (last booted kernel)' --loader '\EFI\ARCH\linux-x64-last.efi'
```
5. To create the first backup entry, either reboot, or run:
```
/usr/libexec/unified-kernel-image-hooks/unified-kernel-image-backup.sh
```
## License
GPL2
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