Add systemd integration for docker-compose service

emby.service

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+# http://container-solutions.com/running-docker-containers-with-systemd/
+# install in /etc/systemd/system/emby.service
+[Unit]
+Description=Emby Media Server
+After=docker.service
+Requires=docker.service
+
+[Service]
+WorkingDirectory=${EMBY_DOCKER_HOME}
+TimeoutStartSec=0
+Restart=always
+EnvironmentFile=-/etc/sysconfig/docker.emby
+# execstartpre is not necessary when using docker-compose
+#ExecStartPre=/usr/local/sbin/docker-compose pull
+ExecStart=/usr/local/sbin/docker-compose run --service-ports emby
+ExecStop=/usr/local/sbin/docker-compose down
+
+[Install]
+WantedBy=multi-user.target

install-emby-service.sh

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+#!/bin/bash
+# Created by Sam Gleske
+# Installs the emby.service file as a systemd service
+
+set -aueEo pipefail
+
+#
+# ENVIRONMENT
+#
+
+DESTINATION=/etc/systemd/system/emby.service
+export EMBY_DOCKER_HOME="${PWD}"
+
+#
+# FUNCTIONS
+#
+
+function msg() {
+  echo "${@}" >&2
+}
+
+function die() {
+  msg "${@}"
+  exit 1
+}; declare -rf die
+
+function checksum() {
+  envsubst < emby.service | sha256sum | awk '{ print $1 }'
+}; declare -rf checksum
+
+function sha256sum() {
+  if type -P sha256sum > /dev/null; then
+    command sha256sum "${@}"
+  elif type -P shasum > /dev/null; then
+    command shasum -a 256 "${@}"
+  else
+    echo "ERROR: could not find a sha256sum program."
+    exit 1
+  fi
+}; declare -rf sha256sum
+
+#
+# MAIN EXECUTION
+#
+
+# pre-flight checks before modifying the system
+[ "${USER:-$(whoami)}" = root ] ||
+  die 'ERROR: must be run as root to install the systemd service.'
+[ -d /lib/systemd ] && type -P systemctl > /dev/null ||
+  die 'ERROR: must be run on a system which uses systemd for init.'
+type -P envsubst > /dev/null ||
+  die 'ERROR: missing gettext package.  "yum install gettext" or "apt install gettext"'
+[ -r emby.service ] ||
+  die 'ERROR: no emby.service found.  Are you in the right working directory?'
+
+# Try to install the service.
+if [ -f "${DESTINATION}" ] && sha256sum -c - <<< "$(checksum)  ${DESTINATION}"; then
+  msg 'SKIPPED: emby.service is already installed.'
+else
+  msg 'Installing systemd service.'
+  envsubst < emby.service > "${DESTINATION}"
+  systemctl daemon-reload
+fi
+
+# Give the final help message.
+cat >&2 <<'EOF'
+With emby.service installed you are now ready to control the service.  This
+script only installs the service and does not control the service for you.
+
+This script is idempotent and can be safely run multiple times to see this
+message agin.
+
+=== SERVICE CONTROL ===
+Start the service.
+    systemctl start emby.service
+Stop the service.
+    systemctl stop emby.service
+Ensure the service autostarts on reboot.
+    systemctl enable emby.service
+Stop the service from autostarting on reboot.
+    systemctl disable emby.service
+
+=== DEBUGGING EMBY SERVICE ===
+View the current service status.
+    systemctl status emby.service
+View the systemd logs for the service.
+    journalctl -u emby.service
+EOF