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#!/usr/bin/env bash

set -Eeuo pipefail

IFS=$'\n\t'

if [[ "${DEBUG:-0}" == "1" ]]; then

set -x

fi

PATH="${PATH:-/usr/bin:/bin:/usr/sbin:/sbin}:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

export DEBIAN_FRONTEND=noninteractive

log_default() {

echo "[$(date '+%Y-%m-%d %H:%M:%S')] autoupdate: $*" >&2

}

NEEDRESTART_FAILED=0

run_autoupdate() {

local logger="${1:-log_default}"

NEEDRESTART_FAILED=0

if ! command -v "$logger" >/dev/null 2>&1; then

logger="log_default"

fi

if ! command -v apt-get >/dev/null 2>&1; then

"$logger" "apt-get not found; cannot continue"

return 1

fi

"$logger" "refreshing package lists"

apt-get update -y

"$logger" "calculating planned upgrades"

if simulation_output="$(apt-get dist-upgrade -s)"; then

PENDING_UPGRADES="$(printf '%s\n' "$simulation_output" | grep -c '^Inst ' || true)"

"$logger" "planned upgrades: ${PENDING_UPGRADES}"

else

"$logger" "failed to simulate dist-upgrade"

return 1

fi

"$logger" "applying dist-upgrade"

apt-get dist-upgrade -y

if command -v needrestart >/dev/null 2>&1; then

"$logger" "restarting affected services via needrestart"

if ! needrestart -r a; then

"$logger" "needrestart reported failures; scheduling reboot"

NEEDRESTART_FAILED=1

fi

fi

"$logger" "running autoremove with purge"

apt-get autoremove --purge -y

}

if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then

run_autoupdate

fi