/usr/lib/plainbox-providers-1/checkbox/bin/led_hdd_test is in plainbox-provider-checkbox 0.3-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!/bin/bash
TIMEOUT=3
TEMPFILE=`mktemp`
trap "rm $TEMPFILE" EXIT
for i in $(seq $TIMEOUT); do
#launch background writer
dd if=/dev/urandom of=$TEMPFILE bs=1024 oflag=direct &
WRITE_PID=$!
echo "Writing..."
sleep 1
kill $WRITE_PID
sync
echo "Reading..."
dd if=$TEMPFILE of=/dev/null bs=1024 iflag=direct
done
echo "OK, now exiting"
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