[Unit]
Description=rpi-setup-loop - set up file on loop device

[Service]
Type=oneshot
ExecStart=/sbin/losetup --nooverlap --find /%I
ExecStartPost=/usr/lib/rpi-loop-utils/bin/rpi-wait-backingfile-symlink %i
ExecStop=/sbin/losetup -d /dev/disk/by-backingfile/%i
RemainAfterExit=yes