Add support for optional deregistration via DISABLE_AUTOMATIC_DEREGISTRATION flag

.pre-commit-config.yaml

@@ -3,6 +3,7 @@ repos:
   rev: 1.0.2
   hooks:
   - id: shell-lint
+    args: [-e, SC1008]
 - repo: https://github.com/stratasan/hadolint-pre-commit
   rev: cdefcb096e520a6daa9552b1d4636f5f1e1729cd
   hooks:

.tool-versions

@@ -0,0 +1 @@
+shellcheck 0.7.0

README.md

@@ -39,6 +39,7 @@ These containers are built via Github actions that [copy the dockerfile](https:/
 | `RUNNER_WORKDIR` | The working directory for the runner. Runners on the same host should not share this directory. Default is '/_work'. This must match the source path for the bind-mounted volume at RUNNER_WORKDIR, in order for container actions to access files. |
 | `RUNNER_GROUP` | Name of the runner group to add this runner to (defaults to the default runner group) |
 | `GITHUB_HOST` | Optional URL of the Github Enterprise server e.g github.mycompany.com. Defaults to `github.com`. |
+| `DISABLE_AUTOMATIC_DEREGISTRATION` | Optional flag to disable signal catching for deregistration. Default is `false`. Any value other than exactly `false` is considered `true`. See [here](https://github.com/myoung34/docker-github-actions-runner/issues/94) |
 
 ## Examples ##
 

entrypoint.sh

@@ -11,6 +11,8 @@ deregister_runner() {
   exit
 }
 
+_DISABLE_AUTOMATIC_DEREGISTRATION=${DISABLE_AUTOMATIC_DEREGISTRATION:-false}
+
 _RUNNER_NAME=${RUNNER_NAME:-${RUNNER_NAME_PREFIX:-github-runner}-$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 13 ; echo '')}
 _RUNNER_WORKDIR=${RUNNER_WORKDIR:-/_work}
 _LABELS=${LABELS:-default}
@@ -40,6 +42,9 @@ echo "Configuring"
     --replace
 
 unset RUNNER_TOKEN
-trap deregister_runner SIGINT SIGQUIT SIGTERM
+
+if [[ ${_DISABLE_AUTOMATIC_DEREGISTRATION} == "false" ]]; then
+  trap deregister_runner SIGINT SIGQUIT SIGTERM
+fi
 
 ./bin/runsvc.sh