nice-upgrade

#! /usr/bin/env sh

DEFAULT_DL_LIMIT="32" # KB/s
APT_LAST_UPDATE_FILE="$HOME/.apt-last-update"
NICE="nice -n 19 ionice -c 3 trickle -s -d ${1:-$DEFAULT_DL_LIMIT}"

if [ -e $APT_LAST_UPDATE_FILE ] && [ $(( $(date +%s) - $(date +%s -r $APT_LAST_UPDATE_FILE) )) -le 3600 ]
then
    echo "APT package lists updated less than an hour ago, skipping"
else
    sudo $NICE apt update
    touch $APT_LAST_UPDATE_FILE
fi

UPGRADABLE="$(script -q /dev/null -c 'apt list --upgradable')"

if [ $(echo -n "$UPGRADABLE" | grep -c '^') -gt "1" ]
then
    echo -e "$UPGRADABLE"
    sudo $NICE aptitude -y full-upgrade
else
    echo "System is up to date, no upgrades required"
fi