GRUB2 bootiing linux iso

grub2.cfg

menuentry "Boot Ubuntu ISO" {
	set root=(hd1,msdos4)
	set isofile=/lubuntu-16.04.3-desktop-amd64.iso
	
	loopback loop $isofile
	linux (loop)/casper/vmlinuz.efi persistent boot=casper iso-scan/filename="$isofile" quiet splash ro locale=zh_CN.UTF-8 noprompt --
	initrd (loop)/casper/initrd.lz
}

menuentry "Boot ArchLinux ISO" {
	set root=(hd0,msdos1)
	set isofile=/archlinux-2018.05.01-x86_64.iso
	
	# ls -l /dev/disk/by-uuid
	set uuid=4A94-70F9
	
	loopback loop $isofile
	probe -l $root -s label
	linux (loop)/arch/boot/x86_64/vmlinuz img_dev=/dev/disk/by-uuid/$uuid img_loop=$isofile
	initrd (loop)/arch/boot/x86_64/archiso.img
}