It seems that /dev/loop is and indicator if fai is called by fai-diskimage.
This is some debug output when running fai-diskimage ===== shell: GRUB_PC/10-setup ===== ainsl: appending to /tmp/fai-diskimage.BARhAu/etc/default/grub: GRUB_DISABLE_OS_PROBER=true ++ chroot /tmp/fai-diskimage.BARhAu grub-probe -tdrive -d /dev/loop0 + GROOT='(hostdisk//dev/loop0)' ++ readlink -f /dev/loop0 + _bdev=/dev/loop0 + '[' /dev/loop0 = /dev/dm ']' + [[ /dev/loop0 =~ /dev/md ]] + [[ (hostdisk//dev/loop0) =~ hostdisk ]] + chroot /tmp/fai-diskimage.BARhAu grub-install --no-floppy --modules=part_msdos /dev/loop0 -- regards Thomas
