#!/bin/bash
#
# Sends a mail message about shutdown to the Linux user itself.
# Hopes the appropriate message forward rule has been set.
#
# Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
# 2021-09-05 v0.1 Initial release

MAIL=$(which mail)
if [ -n "$MAIL" -a -x "$MAIL" ]; then
    subject="[Maintenance] A Docker service has been stopped intentionally on $HOSTNAME"
    message="This is a message from $0 script on $HOSTNAME.\n"
    message+="This Docker service has been stopped intentionally few seconds ago.\n\n"
    message+="Best regards: the Maintenance Bot"
    echo -e "$message" | "$MAIL" -s  "$subject" "$USER"
fi

# That's all, Folks!