[gentoo-user] Multiboot USB - GRUB2 loop device

[Alex Luehm]

Hello all

I've recently taken it upon myself to create a multiboot USB with isos
that I tend to frequently use. So far I've been successful in adding
Clonezilla and the Archlinux live ISOs. I've attempted to add the Gentoo
install ISO in a similar manner (helped with the grub config within the
iso itself but can't seem to get GRUB to recogonize the image. My
DuckDuckGo-foo has returned useless results (a near hit, yet useless 
inquiry being found here:
https://forums.gentoo.org/viewtopic-p-6527390.html).

My current GRUB menu entry is as follows:

menuentry '[loopback]gentoo amd64' {
	set isofile='/isos/gentoo.iso'
	echo "isofile set"
	loopback loop $isofile
	echo "loopback set"
	linux (loop)/isolinux/gentoo64 root=/dev/ram0 init=/linuxrc
		dokeymap looptype=squashfs loop=/image.squashfs cdroot cdboot
		initrd=gentoo64.xz
	initrd (loop)/isolinux/gentoo64.xz
}

When booting, I receive the following message:

isofile set
loopback set
error: attempt to read or write outside of disk 'loop'
error: you need to load the kernel first

Thanks in advance!

-- 
Best,

Alex Luehm