Arch Linux ISO Grub Menuentry

menuentry 'Arch Linux 2019.09.01-x86_64 ISO' {
  set isofile='/ISO/archlinux-2019.09.01-x86_64.iso'
  loopback loop $isofile
  linux (loop)/arch/boot/x86_64/vmlinuz archisodevice=/dev/loop0 img_dev=$imgdevpath img_loop=$isofile earlymodules=loop
  initrd (loop)/arch/boot/x86_64/archiso.img
}