a grub template to boot an archlinux iso straight from the image using grub2 loopback

archlinux-iso-loopback-grub.txt

menuentry "Archlinux-2015.09.01-dual.iso [x86_64]" --class iso {
  set isofile="/archlinux-2015.09.01-dual.iso"
  set partition="2"
  echo -n 'loop > '
  loopback loop (hd0,$partition)/$isofile
  echo -n 'kern > '
  linux (loop)/arch/boot/x86_64/vmlinuz archisolabel=ARCH_201509 img_dev=/dev/disk/by-uuid/1b8e7605-4a1b-4e8d-a67e-44c5734f0313 img_loop=$isofile earlymodules=loop
  # linux (loop)/arch/boot/x86_64/vmlinuz archisolabel=ARCH_201509 img_dev=/dev/disk/by-label/boot img_loop=$isofile earlymodules=loop
  echo -n 'init > '
  initrd (loop)/arch/boot/x86_64/archiso.img
  echo -n 'boot >>> ...'
}