iowatchd 0.5.2

Monitors disk IO usage and logs which processes are consuming it
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#!/bin/sh
# iowatchd-notify - desktop pop-up for iowatchd's notify_command.
#
# Enable it in /etc/iowatchd.conf:
#     notify_command = iowatchd-notify
# then: sudo systemctl reload iowatchd
#
# iowatchd runs as root, which has no desktop session, so this script sends
# the pop-up to every logged-in user's session bus (/run/user/<uid>/bus)
# using notify-send. It reads the IOWATCHD_* variables set by iowatchd.

command -v notify-send >/dev/null 2>&1 || exit 0

# Alerts repeat while IO stays high: show at most one pop-up per minute.
# Recovery pop-ups are always shown.
STAMP=${RUNTIME_DIRECTORY:-/run}/iowatchd-notify.stamp
if [ "$IOWATCHD_EVENT" = alert ]; then
    now=$(date +%s)
    last=$(cat "$STAMP" 2>/dev/null || echo 0)
    [ $((now - last)) -ge 60 ] || exit 0
    { echo "$now" > "$STAMP"; } 2>/dev/null
fi

if [ "$IOWATCHD_EVENT" = alert ]; then
    urgency=critical
    summary="High disk IO on $IOWATCHD_DEVICE ($IOWATCHD_UTIL%)"
    # Keep only the process list (after the first " | "), and the top entries.
    body=${IOWATCHD_MESSAGE#* | }
    [ "$body" = "$IOWATCHD_MESSAGE" ] && body=""
    body=$(printf '%s' "$body" | sed 's/ cmd="[^"]*"//g; s/ | /\n/g' | head -n 3)
else
    urgency=low
    summary="Disk IO back to normal on $IOWATCHD_DEVICE"
    body="$IOWATCHD_MESSAGE"
fi
# notify-send interprets markup in the body.
body=$(printf '%s' "$body" | sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g')

for bus in /run/user/*/bus; do
    [ -S "$bus" ] || continue
    uid=${bus#/run/user/}
    uid=${uid%/bus}
    [ "$uid" -gt 0 ] 2>/dev/null || continue
    user=$(id -nu "$uid" 2>/dev/null) || continue
    runuser -u "$user" -- env "DBUS_SESSION_BUS_ADDRESS=unix:path=$bus" \
        notify-send --app-name=iowatchd --urgency="$urgency" \
        --icon=drive-harddisk "$summary" "$body" >/dev/null 2>&1 &
done
wait