#!/bin/sh
 
set -eu
 
smtphost="$1"
 
if [ -f /etc/dkimkeys/mail.private ]; then
	printf '%s: %s %s\n' "$0"                 \
	"dkim key file /etc/dkimkeys/mail.private" \
	"already exists! Aborting..." >&2
	exit 2
fi
 
opendkim-genkey -r -S -v -b 2048 -D /etc/dkimkeys -d $smtphost -s mail
chown -R opendkim:opendkim /srv/etc/dkimkeys
 
mkdir -p -m o-rwx          /var/spool/postfix/opendkim
chown -R opendkim:opendkim /var/spool/postfix/opendkim
 
usermod --group opendkim --append postfix