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#!/bin/bash
# Sample script to pause or resume all grab-site processes as your free disk
# space crosses a threshold value. Modify the values below.
# Default: 80GB
LOW_DISK_KB=$((80 * 1024 * 1024))
PARTITION=/
CHECK_INTERVAL_SEC=60
# Track whether *we* paused the grab-sites to avoid (typically) resuming
# grab-sites that were paused by the user with e.g. ctrl-z
paused=0
while true; do
left=$(df "$PARTITION" | grep / | sed -r 's/ +/ /g' | cut -f 4 -d ' ')
if [[ $paused = 1 ]] && (( left >= $LOW_DISK_KB )); then
echo "Disk OK, resuming all grab-sites"
paused=0
killall -CONT grab-site
fi
if (( left < $LOW_DISK_KB )); then
echo "Disk low, pausing all grab-sites"
paused=1
killall -STOP grab-site
fi
echo -n ". "
sleep "$CHECK_INTERVAL_SEC"
done