postfix-smtp-relay/entrypoint.sh

#!/bin/sh

#
# entrypoint script for postfix smarthost mail relay
#

convertCase () {
    printf "%s" "$1" | tr "[:lower:]" "[:upper:]"
}

printf "\nVerifying environment variables... "

# check for missing environment variable values
if [ -z "$SMARTHOST" ]; then
    printf "\nYou must specify the hostname or IP address of a smarthost where mail should be relayed.\n\n"
fi
if [ -z "$SMARTHOST_USERNAME" ]; then
    printf "\nYou must provide a username for smarthost authentication.\n\n"
fi
if [ -z "$SMARTHOST_PASSWORD" ]; then
    printf "\nYou must provide a password for smarthost authentication.\n\n"
fi

# set failsafes
[ -z "$SMARTHOST_PORT" ] && SMARTHOST_PORT=587
[ -z "$LOCAL_HOSTNAME" ] && LOCAL_HOSTNAME="smarthost"
[ -z "$LOCAL_DOMAINNAME" ] && LOCAL_DOMAINNAME="${LOCAL_HOSTNAME#*.}"

printf "done\n"
printf "updating configuration files... "

# update main.cf
sed -i "s/{LOCAL_HOSTNAME}/${LOCAL_HOSTNAME}/" /tmp/main.cf.insert
sed -i "s/{LOCAL_DOMAINNAME}/${LOCAL_DOMAINNAME}/" /tmp/main.cf.insert
sed -i "s/{SMARTHOST}/${SMARTHOST}/" /tmp/main.cf.insert
sed -i "s/{SMARTHOST_PORT}/${SMARTHOST_PORT}/" /tmp/main.cf.insert
sed -i "s/{SMARTHOST_USERNAME}/${SMARTHOST_USERNAME}/" /tmp/main.cf.insert
sed -i "s/{SMARTHOST_PASSWORD}/${SMARTHOST_PASSWORD}/" /tmp/main.cf.insert

LOCAL_ENCRYPTION="$(convertCase "$LOCAL_ENCRYPTION")"
case "$LOCAL_ENCRYPTION" in
    OPT*)
        sed -i 's/{LOCAL_ENCRYPTION}/may/' /tmp/main.cf.insert
        sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
        ;;
    TRUE)
        sed -i 's/{LOCAL_ENCRYPTION}/encrypt/' /tmp/main.cf.insert
        sed -i 's/#smtpd_/smtpd_/g' /tmp/main.cf.insert
        ;;
    *)
        sed -i 's/{LOCAL_ENCRYPTION}//' /tmp/main.cf.insert
        ;;
esac

SMARTHOST_ENCRYPTION="$(convertCase "$SMARTHOST_ENCRYPTION")"
case "$SMARTHOST_ENCRYPTION" in
    OPT*)
        sed -i 's/{SMARTHOST_ENCRYPTION}/may/' /tmp/main.cf.insert
        ;;
    TRUE)
        sed -i 's/{SMARTHOST_ENCRYPTION}/secure/' /tmp/main.cf.insert
        ;;
    *)
        sed -i 's/{SMARTHOST_ENCRYPTION}/none/' /tmp/main.cf.insert
        ;;
esac

cat /tmp/main.cf.insert >> /etc/postfix/main.cf
rm -f /tmp/main.cf.insert

# update master.cf
sed -i 's/#tlsproxy/tlsproxy/' /etc/postfix/master.cf

printf "done\n"
printf "container setup complete!\n"

# run CMD passed to this container
printf "\nExecuting: %s\n" "$*"
exec "$@"

exit 0
#EOF