test.sh

#!/bin/sh

set -e

cleanup_mailer=0
cleanup_mailhog=0
cleanup_docker=0
cleanup_network=0
cleanup() {
  set +e

  if [ "$cleanup_mailer" -ne 0 ]; then
    echo "Logs mailer"
    docker logs mailer

    echo "Stopping mailer Docker image"
    docker stop mailer
    docker rm -f mailer
  fi

  if [ "$cleanup_mailhog" -ne 0 ]; then
    echo "Logs mailhog"
    docker logs mailhog

    echo "Stopping mailhog Docker image"
    docker stop mailhog
    docker rm -f mailhog
  fi

  if [ "$cleanup_docker" -ne 0 ]; then
    echo "Logs"
    docker logs test

    echo "Stopping Docker image"
    docker stop test
    docker rm -f test
  fi

  if [ "$cleanup_network" -ne 0 ]; then
    echo "Removing Docker network"
    docker network rm testnet
  fi
}

trap cleanup EXIT

echo "Creating Docker network"
time docker network create testnet
cleanup_network=1

echo "Preparing"
apk add --no-cache jq

export MAILNAME=test
export MY_NETWORKS="$(docker network inspect testnet | jq -r '.[0].IPAM.Config[0].Subnet') 127.0.0.0/8"

echo "Running Docker image"
docker run -d --name test --network testnet -e MAILNAME -e MY_NETWORKS -e LOG_TO_STDOUT=1 "${CI_REGISTRY_IMAGE}:${TAG}"
cleanup_docker=1

echo "Running mailhog Docker image"
docker run -d --name mailhog --network testnet -p 8025:8025 mailhog/mailhog:v1.0.1 -hostname mailhog -smtp-bind-addr :25
cleanup_mailhog=1

echo "Running mailer Docker image"
docker run -d --name mailer --network testnet -e LOG_TO_STDOUT=1 -e REMOTES=test registry.gitlab.com/tozd/docker/mailer:ubuntu-jammy
cleanup_mailer=1

echo "Sleeping"
sleep 20

echo "Testing"
# We inside mailer container use sendmail to send an e-mail to mailhog.
# Mailer container first sends it to test container which then in turn sends it to mailhog.
/bin/echo -e "Subject: test\nTo: test@mailhog" | docker exec -i mailer sendmail -t
sleep 10
wget -q -O - http://docker:8025/api/v2/messages | jq -r .items[0].Raw.To[0] | grep -F test@mailhog
echo "Success"