dockcheck/notify_smtp.sh

### DISCLAIMER: This is a third party addition to dockcheck - best effort testing.
# INFO: ssmtp is depcerated - consider to use msmtp instead.
#
# Copy/rename this file to notify.sh to enable the notification snipppet.
# mSMTP/sSMTP has to be installed and configured manually.
# Modify to fit your setup - changing SendMailFrom, SendMailTo, SubjectTag

MSMTP=$(which msmtp)
SSMTP=$(which ssmtp)

if [ -n $MSMPT ] ; then
	MAIL=$MSMTP
elif [ -n $SSMTP ] && [ -z $MAIL ] ; then
	MAIL=$SSMTP
else
	echo "No msmtp or ssmtp binary found in PATH: $PATH" ; exit 1
fi

send_notification() {
Updates=("$@")
UpdToString=$( printf "%s\n" "${Updates[@]}" )
FromHost=$(hostname)

# User variables:
SendMailFrom="me@mydomain.tld"
SendMailTo="me@mydomain.tld"
SubjectTag="dockcheck"

printf "\nSending email notification.\n"

$MAIL $SendMailTo << __EOF
From: "$FromHost" <$SendMailFrom>
date:$(date -R)
To: <$SendMailTo>
Subject: [$SubjectTag] Updates available on $FromHost
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

The following containers on $FromHost have updates available:

$UpdToString

__EOF
}