Add delay mk_apt to reduce update reports, based on https://github.com/ypid-bot/check_mk/blob/master/agents/plugins/mk_apt

mk_apt

#!/bin/bash
# Check for APT updates (Debian, Ubuntu)
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2014             [email protected] |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk is free software;  you can redistribute it and/or modify it
# under the  terms of the  GNU General Public License  as published by
# the Free Software Foundation in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# tails. You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.

# TODO:
# Einstellungen:
# - upgrade oder dist-upgrade
# - vorher ein update machen
# Bakery:
# - Bakelet anlegen
# - Async-Zeit einstellbar machen und das Ding immer async laufen lassen
# Check programmieren:
#   * Schwellwerte auf Anzahlen
#   * Regexen auf Pakete, die zu CRIT/WARN führen
# - Graph malen mit zwei Kurven

# This variable can either be "upgrade" or "dist-upgrade"
UPGRADE=upgrade
DO_UPDATE=yes
STATUS_FILE="/tmp/apt_update_status.txt"
WAIT_DAYS=7

function check_apt_update {
    if [ "$DO_UPDATE" = yes ] ; then
        # NOTE: Even with -qq, apt-get update can output several lines to
        # stderr, e.g.:
        #
        # W: There is no public key available for the following key IDs:
        # 1397BC53640DB551
        apt-get update -qq 2> /dev/null
    fi
    apt-get -o 'Debug::NoLocking=true' -s -qq "$UPGRADE" | grep -v '^Conf'
}

function days_since_update {
    if [ -f "$STATUS_FILE" ]; then
        last_update=$(cat "$STATUS_FILE")
        now=$(date +%s)
        elapsed_days=$(( (now - last_update) / 86400 ))
        echo "$elapsed_days"
    else
        echo "-1"
    fi
}


if type apt-get > /dev/null ; then
    echo '<<<apt:sep(0)>>>'
    out=$(check_apt_update)
    if [ -z "$out" ]; then
        echo "No updates pending for installation"
        [ -f "$STATUS_FILE" ] && rm "$STATUS_FILE"
    else
        elapsed_days=$(days_since_update)
        if [ "$elapsed_days" -lt 0 ]; then
            echo "$(date +%s)" > "$STATUS_FILE"
            echo "No updates pending for installation"
        elif [ "$elapsed_days" -ge "$WAIT_DAYS" ]; then
            # Wartezeit ist abgelaufen
            echo "$out"
        else
            echo "No updates pending for installation"
        fi
    fi
fi

mk_apt_tuesday

#!/bin/bash

# Einstellungen
UPGRADE=upgrade
DO_UPDATE=yes
STATUS_FILE="/tmp/apt_update_status.txt"

# Funktion zum Überprüfen, ob heute der 2. oder 4. Dienstag im Monat nach 19 Uhr ist
function is_second_or_fourth_tuesday_after_19 {
    local day_of_month=$(date +%d)
    local weekday=$(date +%u)  # 1 = Montag, 2 = Dienstag, ...
    local hour=$(date +%H)
    
    # Überprüfen, ob heute Dienstag ist
    if [ "$weekday" -ne 2 ]; then
        return 1
    fi
    
    # Berechnung des ersten Dienstags im Monat:
    # Erster Tag des Monats ermitteln und dessen Wochentag (1 = Montag, ... 7 = Sonntag)
    local first_day=$(date -d "$(date +%Y-%m-01)" +%u)
    # Offset berechnen: Wie viele Tage fehlen bis zum Dienstag (2)
    local offset=$(( (2 - first_day + 7) % 7 ))
    local first_tuesday=$(( 1 + offset ))
    
    # Berechnung des zweiten und vierten Dienstags
    local second_tuesday=$(( first_tuesday + 7 ))
    local fourth_tuesday=$(( first_tuesday + 21 ))
    
    # Überprüfen, ob heute der zweite oder vierte Dienstag ist
    if [ "$day_of_month" -eq "$second_tuesday" ] || [ "$day_of_month" -eq "$fourth_tuesday" ]; then
        # Überprüfen, ob die Zeit nach 19:00 Uhr ist
        if [ "$hour" -ge 19 ]; then
            return 0
        fi
    fi
    
    return 1
}

function check_apt_update {
    if [ "$DO_UPDATE" = yes ] ; then
        apt-get update -qq 2> /dev/null
    fi
    apt-get -o 'Debug::NoLocking=true' -s -qq "$UPGRADE" | grep -v '^Conf'
}

if type apt-get > /dev/null ; then
    echo '<<<apt:sep(0)>>>'
    
    # Falls noch Updates offen sind, weiter prüfen
    if [ -f "$STATUS_FILE" ]; then
        out=$(check_apt_update)
        if [ -z "$out" ]; then
            echo "No updates pending for installation"
            rm "$STATUS_FILE"
        else
            echo "$out"
        fi
    elif is_second_or_fourth_tuesday_after_19; then
        out=$(check_apt_update)
        if [ -n "$out" ]; then
            echo "$out" > "$STATUS_FILE"
            echo "$out"
        else
            echo "No updates pending for installation"
        fi
    else
        echo "No updates pending for installation"
    fi
fi