Merge pull request myoung34#298 from LordChunk/pr/start-docker-with-env

Start Docker service with env variable

README.md

@@ -69,3 +69,4 @@ These containers are built via Github actions that [copy the dockerfile](https:/
 | `CONFIGURED_ACTIONS_RUNNER_FILES_DIR` | Path to use for runner data. It allows avoiding reregistration each the start of the runner. No default value. |
 | `EPHEMERAL` | Optional flag to configure runner with [`--ephemeral` option](https://docs.github.com/en/actions/hosting-your-own-runners/autoscaling-with-self-hosted-runners#using-ephemeral-runners-for-autoscaling). Ephemeral runners are suitable for autoscaling. |
 | `DISABLE_AUTO_UPDATE` | Optional environment variable to [disable auto updates](https://github.blog/changelog/2022-02-01-github-actions-self-hosted-runners-can-now-disable-automatic-updates/). Auto updates are enabled by default to preserve past behavior. Any value is considered truthy and will disable them. |
+| `START_DOCKER_SERVICE` | Optional flag which automatically starts the docker service if set to `true`. Useful when using [sysbox](https://github.com/nestybox/sysbox). Defaults to `false`.

entrypoint.sh

@@ -46,6 +46,7 @@ _LABELS=${LABELS:-default}
 _RUNNER_GROUP=${RUNNER_GROUP:-Default}
 _GITHUB_HOST=${GITHUB_HOST:="github.com"}
 _RUN_AS_ROOT=${RUN_AS_ROOT:="true"}
+_START_DOCKER_SERVICE=${START_DOCKER_SERVICE:="false"}
 
 # ensure backwards compatibility
 if [[ -z ${RUNNER_SCOPE} ]]; then
@@ -166,6 +167,12 @@ if [[ ${_DISABLE_AUTOMATIC_DEREGISTRATION} == "false" ]]; then
   trap deregister_runner SIGINT SIGQUIT SIGTERM INT TERM QUIT
 fi
 
+# Start docker service if needed (e.g. for docker-in-docker)
+if [[ ${_START_DOCKER_SERVICE} == "true" ]]; then
+  echo "Starting docker service"
+  service docker start
+fi
+
 # Container's command (CMD) execution as runner user