mergerfs/tools/mergerfs.percent-full-mover

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#!/usr/bin/env sh
if [ $# != 3 ]; then
echo "usage: $0 <cache-fs> <backing-pool> <percentage>"
exit 1
fi
CACHE="${1}"
BACKING="${2}"
PERCENTAGE=${3}
set -o errexit
while [ $(df --output=pcent "${CACHE}" | grep -v Use | cut -d'%' -f1) -gt ${PERCENTAGE} ]
do
FILE=$(find "${CACHE}" -type f -printf '%A@ %P\n' | \
sort | \
head -n 1 | \
cut -d' ' -f2-)
test -n "${FILE}"
rsync -axqHAXWESR --preallocate --remove-source-files "${CACHE}/./${FILE}" "${BACKING}/"
done