Within live-boot's debian/patches/07_support_findiso.dpatch we're using code
from the main live script nowadays, though AFAICT the following part is missing:
if [ -n "$FROMISO" ] && [ "${TORAM}" ]
then
losetup -d /dev/loop0
grep -q /isofrom /proc/mounts && umount /
isofrom
fi
Needs testing/debugging.
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