Systemd config mess.

api-internal.1.service

[Unit]
Description=API Internal
After=docker.service
Requires=docker.service

[Service]
ExecStartPre=/bin/bash /repos/services/api-internal/init.sh pre-start
ExecStart=/bin/bash /repos/services/api-internal/init.sh start

init.sh

#!/bin/bash

case "$1" in

    pre-start)
        cd /repos/api-internal
        git fetch && git checkout origin/master
        docker pull quay.io/kballenegger/rack-app
        ;;

    start)
        docker run
            -p 80:9977
            -v /repos/api-internal:/app
            quay.io/kballenegger/rack-app
            bash -l -c <<'CMD'
                bundle install --deployment --without="test development"  &&
                bundle exec thin -R config.ru -p 9977 start
CMD
        ;;

    *)
        echo "Usage: $0 {pre-start|start}"
        exit 1
        ;;
esac