#! /bin/sh

set -e

UPDATEDB=/usr/sbin/updatedb.plocate

# Skip if systemd timer is available.
if [ -d /run/systemd/system ]; then
    exit 0
fi

[ -x $UPDATEDB ] || exit 0

if which on_ac_power >/dev/null 2>&1; then
    ON_BATTERY=0
    on_ac_power >/dev/null 2>&1 || ON_BATTERY=$?
    if [ "$ON_BATTERY" -eq 1 ]; then
        exit 0
    fi
fi

# See ionice(1).
IONICE=
if [ -x /usr/bin/ionice ] &&
    /usr/bin/ionice -c3 true 2>/dev/null; then
    IONICE="/usr/bin/ionice -c3"
fi

# See nocache(1).
NOCACHE=
if [ -x /usr/bin/nocache ]; then
    NOCACHE="/usr/bin/nocache"
fi

flock --nonblock /run/plocate.daily.lock $NOCACHE $IONICE nice $UPDATEDB