call process and send unicode mail with status

mailstatus.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2015 Lenna X. Peterson
# All rights reserved

import os
import socket
import subprocess
import sys


# # # # # # # # # # # # # # # # 
# FILL THESE OUT
sender_name = "admin"
recipient_address = ""
# # # # # # # # # # # # # # # # 

def send_mail(subject, message, recipient_address,
              sender_address=None, sender_name=None):
    """
    Send unicode mail.
    """
    if sender_address is None:
        sender_address = "{user}@{fqdn}".format(
            user=os.environ['LOGNAME'],
            fqdn=socket.getfqdn())
    if sender_name is None:
        sender_name = os.environ['LOGNAME']

    os.environ['LANG'] = "en_US.utf8"
    os.environ['LC_CTYPE'] = "en_US.utf8"

    mail_fmt = """Subject: {subject}
From: {sender_name} <{sender_address}>
To: {recipient_address}
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

{message}"""

    mail = mail_fmt.format(subject=subject,
                           sender_address=sender_address,
                           sender_name=sender_name,
                           recipient_address=recipient_address,
                           message=message)

    sendmail_cmd = ["/usr/sbin/sendmail", "-i", "-f", sender_address, "-F",
                    sender_name, recipient_address]

    mailproc = subprocess.Popen(sendmail_cmd, stdin=subprocess.PIPE)
    mailproc.communicate(mail.encode("utf-8"))

def main():
    """Run command and send status"""

    # Configure mail
    message_kwargs = dict(user=os.environ['LOGNAME'],
                          hostname=socket.gethostname())

    # Prepare command
    args = sys.argv[1:]
    if not args:
        print("Usage: mailstatus.py [script to watch]")
        sys.exit(1)
    partialargs = args[:20]
    if len(partialargs) < len(args):
        partialargs.append("...")

    # Run process
    proc = subprocess.Popen(args)
    proc.communicate()
    pid = proc.pid
    exitcode = proc.returncode

    smiley = "☺"
    frowny = "😞"
    teethgrin = "😀"
    grin = "😃"
    sadcry = "😭"

    # Format message
    if exitcode:
        status = sadcry
    else:
        status = grin
    subject = '"{hostname} {pid} {status}"'.format(pid=pid, status=status,
                                                    **message_kwargs)
    message_kwargs['cmd'] = " ".join(partialargs)
    message_kwargs['exitcode'] = exitcode
    message = "{status}\n'{cmd}' exited {exitcode}\n{user}@{hostname}".format(status=status, **message_kwargs)
    
    send_mail(subject=subject,
              message=message,
              recipient_address=recipient_address,
              sender_name=sender_name)

    sys.exit(exitcode)

if __name__ == "__main__":
    main()