Add compatibility with Github ARC

README.md

@@ -75,3 +75,21 @@ To stop the containers:
 ```bash
 docker compose down
 ```
+
+### Github ARC
+
+This image can also be used with Github Actions Runner Controller (ARC).
+
+To use it, modify the `values.yaml` during the ScaleSet installation:
+```yaml
+template:
+  spec:
+    runtimeClassName: sysbox-runc
+    hostUsers: false
+    containers:
+      - name: runner
+        image: "ghcr.io/ableytner/docker-github-actions-runner:dev-ubuntu"
+        imagePullPolicy: Always
+        command:
+          - /entrypoint-arc.sh
+```

docker-compose.yaml

@@ -10,6 +10,8 @@ services:
       TOKEN: ${TOKEN}
       # These are in addition to self-hosted,Linux,<arch>
       # EXTRA_LABELS: docker,nonroot,example
+      # You can add additional args that are passed to the runner binary
+      # RUNNER_ARGS: --ephemeral
     deploy:
       mode: replicated
       replicas: 2

linux/Dockerfile

@@ -14,20 +14,20 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update \
   && apt-get install -y curl jq sudo \
-  && useradd -m runner \
+  && useradd -m -G 0 runner \
   && usermod -aG sudo runner \
   && echo '%sudo ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers \
   && mkdir /opt/hostedtoolcache \
   && chmod 777 /opt/hostedtoolcache
 
 # install github actions runner
-RUN INSTRUCTION_SET="$(arch | sed s/aarch64/arm64/ | sed s/x86_64/x64/)" \
-  && mkdir -p /home/runner/actions-runner \
-  && curl -L https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/actions-runner-linux-${INSTRUCTION_SET}-${RUNNER_VERSION}.tar.gz -o /home/runner/actions-runner/actions.tar.gz \
-  && cd /home/runner/actions-runner \
+RUN ARCH="$(arch | sed s/aarch64/arm64/ | sed s/x86_64/x64/)" \
+  && mkdir -p /home/runner \
+  && curl -L https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/actions-runner-linux-${ARCH}-${RUNNER_VERSION}.tar.gz -o /home/runner/actions.tar.gz \
+  && cd /home/runner \
   && tar -xzf actions.tar.gz \
   && rm actions.tar.gz \
-  && chown -R runner /home/runner/actions-runner \
+  && chown -R runner /home/runner \
   && ./bin/installdependencies.sh
 
 # install simple apt packages
@@ -85,4 +85,6 @@ COPY --chmod=755 scripts/* /
 # switch to the runner user
 USER runner
 
+WORKDIR /home/runner
+
 ENTRYPOINT ["/entrypoint.sh"]

linux/scripts/entrypoint-arc.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -o nounset
+
+# [SETUP]
+
+# start docker
+echo "Starting docker..."
+sudo service docker start > /dev/null
+sleep 5
+if [[ "$(service docker status)" == *"Docker is running"* ]]; then
+    echo "Done!"
+else
+    echo "Docker didn't start, status is:"
+    service docker status
+    exit 1
+fi
+
+# [START]
+
+/home/runner/run.sh

linux/scripts/entrypoint.sh

@@ -34,7 +34,7 @@ fi
 
 echo "Registering runner..."
 
-cd /home/runner/actions-runner
+cd /home/runner
 
 if [[ -v REPO ]]; then
     REQ_TOKEN_URL=https://api.github.com/repos/${REPO}/actions/runners/registration-token
@@ -61,7 +61,8 @@ rm token_resp.txt
     --name "${RUNNER_NAME:-"runner-ubuntu"}-${HOSTNAME}" \
     --unattended \
     --disableupdate \
-    --labels "${EXTRA_LABELS:-}"
+    --labels "${EXTRA_LABELS:-}" \
+    "${RUNNER_ARGS:-}"
 
 cleanup() {
     echo "Removing runner..."