#!/usr/bin/env bash
set -e

KEY_FILE=/etc/opendkim/keys/mail.private

# Wait for DKIM key (mounted read-only from host)
for i in $(seq 1 30); do
    [[ -f "$KEY_FILE" ]] && break
    echo "Waiting for DKIM key at $KEY_FILE ... (run mail/install.sh on host)"
    sleep 2
done
if [[ ! -f "$KEY_FILE" ]]; then
    echo "ERROR: DKIM key not found at $KEY_FILE" >&2
    exit 1
fi

# Docker の embedded DNS (127.0.0.11) は MX クエリを解決できないことがあるため
# 外部 DNS に差し替える（sed -i は bind mount で失敗するため python3 で書き換え）
python3 - << 'PYEOF'
path = '/etc/resolv.conf'
content = open(path).read().replace('nameserver 127.0.0.11', 'nameserver 8.8.8.8')
if '1.1.1.1' not in content:
    content += 'nameserver 1.1.1.1\n'
open(path, 'w').write(content)
PYEOF

# Start rsyslog for Postfix logging
rsyslogd

# Start OpenDKIM (runs as root per opendkim.conf UserID)
opendkim -x /etc/opendkim.conf
sleep 2

# Start Postfix
postfix start

# Keep container alive, forward mail log to stdout
touch /var/log/mail.log
exec tail -f /var/log/mail.log