WORKING Antergos Arch OS ISO boot from loop GRUB2

Antergos Arch OS ISO boot from loop GRUB2

menuentry "Antergos" {
        iso_path="/boot/iso/antergos-2014.08.07-x86_64.iso"
        search --no-floppy --file ${iso_path} --set
        live_args="for-arch --> img_loop=${iso_path}  img_dev=/dev/sda1 earlymodules=loop"
        custom_args=""
        iso_args="archisobasedir=arch archisolabel=ANTERGOS quiet"
        loopback loop ${iso_path}
        linux (loop)/arch/boot/vmlinuz ${live_args} ${custom_args} ${iso_args}
        initrd (loop)/arch/boot/archiso.img /boot/iso/additional-initramfs/initramfs
}