Grub2 Loop Boot Solution

[YodaDaCoda]

I maintain a flash disk full of ISOs, which I loop boot through grub2 and a custom grub.cfg. Since I'm sure I'm not the only one, and because there doesn't seem to be any documentation, I'd like to share my menuentry for anyone else who wants the same thing (I have seen at least one person asking on these forums).

menuentry "Kali Linux 1.0 amd64" {
    iso="/kali-linux-1.0-amd64.iso"
    bootoptions="findiso=$iso boot=live noconfig=sudo username=root hostname=kali quiet splash"
    search --set -f $iso
    loopback loop $iso
    linux (loop)/live/vmlinuz $bootoptions
    initrd (loop)/live/initrd.img
}
menuentry "Kali Linux 1.0 amd64 (forensic)" {
    iso="/kali-linux-1.0-amd64.iso"
    bootoptions="findiso=$iso boot=live noconfig=sudo username=root hostname=kali noswap noautomount"
    search --set -f $iso
    loopback loop $iso
    linux (loop)/live/vmlinuz $bootoptions
    initrd (loop)/live/initrd.img
}

[am!]

Hello. I edited above mentioned menuentry. (only title, and path to iso)

menuentry "Kali Linux" {
    iso="/iso/kali.iso"
    bootoptions="findiso=$iso boot=live noconfig=sudo username=root hostname=kali quiet splash"
    search --set -f $iso
    loopback loop $iso
    linux (loop)/live/vmlinuz $bootoptions
    initrd (loop)/live/initrd.img
}

it seems like it is able to find kernel, but after several seconds (quick shifting text lines appear) it freeze at blank screen.
im trying boot Kali (i386 version) from harddisk (sda1)

[am!]

Kali 1.0.6 is booting whit out any problem...

[Johannes]

Hi everyone,
I tried above menuentry (and manual boot from grub 1.99rc1) but it doesn't work for me. I get message:

Booting a command list

error: unknown command 'search'
error: no such disk
error: no such disk
error: you need to load the kernel first

I understand I have to show grub the right path, but how can I substitute command "search"?
Thanks for help.