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A simple ruby script that automatically adds ISO entries to GRUB 2.0
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README

===== BOOTISO =====

A simple ruby script that adds bootable iso entries to GRUB 2

Since GRUB 2 supports this awesome feature that enables the bootloader to boot directly from ad ISO image, I wrote this little ruby program that automatically syncs the configuration of the bootloader with ISO specs written by the user.

Every bootable ISO entry must be described in a spec file (YAML format). The standard format is very simple, and little info is needed in order to put everything to work.

---
config:
name: "System Rescue CD"
use: isoloop
boot_path: /isolinux/
kernel: rescuecd
initrd: initram.igz
root_dev: /dev/sdb1
grub_dev: "(hd1,1)"
iso_path: /boot/iso/
iso_filename: sysresc.iso
boot_opts: "vga=37C"

A little explanation of the YAML parameters:

- name : entry name that will pop up in the grub menu i
- use : root-bind method that the iso distribution uses to boot the operating system (may vary.. Sysresc uses isoloop, Ubuntu uses findiso) 
- boot_path : internal iso path where kernel image and initrd files are located 
- kernel : kernel image file name 
- initrd : initial ramdisk file name 
- root_dev : physical disk partition where the ISO path is located 
- grub_dev : same as before, but this time the device must be specified in GRUB format (for example if root_dev==/dev/sdb1, grub_dev==(hd1,1)) 
- iso_path : path where the ISO file is located (calculated from the BASE PATH from root_dev) 
- iso_filename : ISO file name 
- boot_opts : boot parameters that will be passed to the kernel image

Last but not least, put the script in /etc/grub.d/ with the name “35_bootiso”, and set the execution bit on it. Now just launch update-grub and grub.cfg will be automatically updated with the new directives:

# BOOTISO Generated entries below
# BOOT ENTRY for: System Rescue CD
menuentry "System Rescue CD" {
      insmod ext2
      set root='(hd1,1)'
      search --no-floppy --fs-uuid --set fe5190bc-71f4-402a-a70a-054af7ed37a6
      loopback loop /boot/iso/sysresc.iso
      linux (loop)/isolinux/rescuecd isoloop=/boot/iso/sysresc.iso vga=37C
      initrd (loop)/isolinux/initram.igz
}

You can add more entries by generating multiple YAML specs in /etc/bootiso. 
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