[Unit]
Description=Refresh lostfiles report at /run/lostfiles.txt
Documentation=man:lostfiles(1)
ConditionPathExists=/usr/bin/lostfiles

[Service]
Type=oneshot
Nice=19
IOSchedulingClass=idle
ExecStart=/bin/sh -c '/usr/bin/lostfiles >/run/lostfiles.txt.tmp && mv /run/lostfiles.txt.tmp /run/lostfiles.txt'