bootutils

bootutils: Utilities to create bootable disks, remaster ISO images, make multiboot disk images
Goals – who needs this?
Use case 1: Multiboot disk image
Use case 2: Remastering ISO
Use case 3: Create boot disk on separate disk
Use case 4: Fix grub-install errors
Linux-only. No effort spent on supporting other OS

https://github.com/sundarnagarajan/bootutils