docker-postfix/scripts/opendkim.sh

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#!/bin/sh
noop() {
while true; do
# 2147483647 = max signed 32-bit integer
# 2147483647 s ≅ 70 years
sleep infinity || sleep 2147483647
done
}
if [ ! -d /etc/opendkim/keys ]; then
noop
elif [ -z "$(find /etc/opendkim/keys -type f ! -name .)" ]; then
noop
else
/usr/sbin/opendkim -D -f -x /etc/opendkim/opendkim.conf
fi