Ajout d’une passerelle de messagerie pour les conteneurs.

misc/images/mta/containers/Dockerfile

@@ -0,0 +1,33 @@
+FROM debian:buster-slim
+
+RUN set -eux; \
+	apt-get update; \
+	apt-get install -y \
+		exim4-daemon-light \
+		tini \
+	; \
+	rm -rf /var/lib/apt/lists/*; \
+	ln -svfT /etc/hostname /etc/mailname
+
+# https://blog.dhampir.no/content/exim4-line-length-in-debian-stretch-mail-delivery-failed-returning-message-to-sender
+# https://serverfault.com/a/881197
+# https://bugs.debian.org/828801
+RUN echo "IGNORE_SMTP_LINE_LENGTH_LIMIT='true'" >> /etc/exim4/exim4.conf.localmacros
+
+RUN set -eux; \
+	mkdir -p /var/spool/exim4 /var/log/exim4; \
+	chown -R Debian-exim:Debian-exim /var/spool/exim4 /var/log/exim4
+
+COPY set-exim4-update-conf docker-entrypoint.sh /usr/local/bin/
+RUN set -eux; \
+	set-exim4-update-conf \
+		dc_eximconfig_configtype 'internet' \
+		dc_hide_mailname 'true' \
+		dc_local_interfaces '0.0.0.0 ; ::0' \
+		dc_other_hostnames '' \
+		dc_relay_nets '0.0.0.0/0' \
+	;
+
+EXPOSE 25
+ENTRYPOINT ["docker-entrypoint.sh"]
+CMD ["exim", "-bd", "-v"]

misc/images/mta/containers/docker-entrypoint.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -Eeuo pipefail
+
+if [ "$1" = 'exim' ]; then
+	if [ -n "${GMAIL_USER:-}" ] && [ -n "${GMAIL_PASSWORD:-}" ]; then
+		# see https://wiki.debian.org/GmailAndExim4
+		export EXIM4_SMARTHOST='smtp.gmail.com::587' \
+			EXIM4_SMARTHOST_USER="$GMAIL_USER" \
+			EXIM4_SMARTHOST_PASSWORD="$GMAIL_PASSWORD"
+	fi
+	unset GMAIL_USER GMAIL_PASSWORD # scrub env of creds
+
+	if [ -n "${EXIM4_SMARTHOST:-}" ]; then
+		set-exim4-update-conf \
+			dc_eximconfig_configtype 'smarthost' \
+			dc_smarthost "$EXIM4_SMARTHOST"
+		if [ -n "${EXIM4_SMARTHOST_USER:-}" ] && [ -n "${EXIM4_SMARTHOST_PASSWORD:-}" ]; then
+			echo "*:$EXIM4_SMARTHOST_USER:$EXIM4_SMARTHOST_PASSWORD" > /etc/exim4/passwd.client
+		fi
+	fi
+	unset EXIM4_SMARTHOST EXIM4_SMARTHOST_USER EXIM4_SMARTHOST_PASSWORD # scrub env of creds
+
+	if [ "$(id -u)" = '0' ]; then
+		mkdir -p /var/spool/exim4 /var/log/exim4 || :
+		chown -R Debian-exim:Debian-exim /var/spool/exim4 /var/log/exim4 || :
+	fi
+
+	if [ "$$" = 1 ]; then
+		set -- tini -- "$@"
+	fi
+fi
+
+exec "$@"

misc/images/mta/containers/set-exim4-update-conf

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+conf='/etc/exim4/update-exim4.conf.conf'
+
+args=()
+while [ "$#" -gt 0 ]; do
+	key="$1"
+	value="$2"
+	shift 2
+
+	if ! grep -qE "^#?${key}=" "$conf"; then
+		echo >&2 "error: '$key' not found in '$conf'"
+		exit 1
+	fi
+
+	sed_escaped_value="$(sed -e 's/[\/&]/\\&/g' <<<"$value")"
+	args+=( -e "s/^#?(${key})=.*/\1='${sed_escaped_value}'/" )
+done
+
+if [ "${#args[@]}" -eq 0 ]; then
+	echo >&2 "error: nothing to do?"
+	exit 1
+fi
+
+set -x
+sed -ri "${args[@]}" "$conf"
+update-exim4.conf -v