systemd-monitor-jobs.py

#!/usr/bin/python
# coding=utf-8

from gi.repository import GObject
import sys
import dbus
import smtplib
import subprocess
from datetime import datetime
from dbus.mainloop.glib import DBusGMainLoop
from email.mime.text import MIMEText
import socket

fromemail = 'root@example.com'
recipient = 'myself@example.com'

DBusGMainLoop(set_as_default=True)

bus = dbus.SystemBus()
systemd = bus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1')
manager = dbus.Interface(systemd, 'org.freedesktop.systemd1.Manager')

def OnJobRemoved(id, job, unit, result):
    print('%d: Job Removed: ' % id, job, unit, result)

    if result == "done":
        print("%d: Result is done, skipping email." % id)
        return

    logs = subprocess.check_output(["journalctl", "-u", unit, "--lines=20"])
    logs = logs.decode("utf-8")

    msg = "Systemd job %s finished execution at %s with result %s.\n\n%s"
    msg = MIMEText(msg % (unit, datetime.now(), result, logs))
    msg['To'] = recipient
    msg['From'] = fromemail
    msg['Subject'] = "%s: Job %s finished with result %s" % (socket.getfqdn(), unit, result)

    srv = smtplib.SMTP("localhost")
    try:
        srv.sendmail(fromemail, [recipient], msg.as_string())
        print("%d: Sent email: %s" % (id, msg['Subject']))
    finally:
        srv.quit()

manager.Subscribe()
manager.connect_to_signal('JobRemoved', OnJobRemoved)

loop = GObject.MainLoop()
loop.run()

systemd-monitor-jobs.service

[Unit]
Description=Systemd email monitoring
After=network.target postfix.service

[Service]
ExecStart=/etc/systemd/system/systemd-monitor-jobs.py

[Install]
WantedBy=multi-user.target