add exec runner

.drone.yml

@@ -30,16 +30,33 @@ steps:
       - COMMIT_HASH=$(git log -n 1 --pretty=%H)
       # collect info from current image
       - echo $REGISTRY_PWD | docker login -u drone --password-stdin registry.jfmonty2.com
-      - docker pull registry.jfmonty2.com/drone-server:latest
-      - IMAGE_COMMIT_HASH=$(docker image inspect -f '{{ .Config.Labels.drone_commit_hash }}' registry.jfmonty2.com/drone-server:latest)
-      # compare and trigger CI if necessary
+      # defaults to 0 if image can't be found
+      - docker pull registry.jfmonty2.com/drone-server:latest || true
+      - IMAGE_COMMIT_HASH=$(docker image inspect -f '{{ .Config.Labels.drone_commit_hash }}' registry.jfmonty2.com/drone-server:latest || echo 0)
+      # compare and trigger build if necessary
       - |
         if [[ $COMMIT_HASH != $IMAGE_COMMIT_HASH ]]; then
           echo 'Updates available, triggering server build.'
           curl -X POST -H "Authorization: Bearer $DRONE_API_TOKEN" \
           https://drone.jfmonty2.com/api/repos/jfmonty2/drone/builds/$DRONE_BUILD_NUMBER/promote?target=server-build
         else
-          echo 'Image is already up to date.'
+          echo 'Server is already up to date.'
+        fi
+      # now check for runner
+      - echo "Checking for new runner version"
+      - RELEASE=$(curl https://api.github.com/repos/drone-runners/drone-runner-exec/releases | jq -r '.[0]')
+      - LATEST_VERSION=$(echo $RELEASE | jq -r '.tag_name')
+      # get version of currently running instance (also defaults to 0 if not found)
+      - docker pull registry.jfmonty2.com/drone-runner-exec:latest || true
+      - CURRENT_VERSION=$(docker image inspect -f '{{ .Config.Labels.drone_runner_version }}' registry.jfmonty2.com/drone-runner-exec:latest || echo 0)
+      # compare and trigger build if necessary
+      - |
+        if [[ $LATEST_VERSION != $CURRENT_VERSION ]]; then
+          echo 'New release available, triggering runner build.'
+          curl -X POST -H "Authorization: Bearer $DRONE_API_TOKEN" \
+          https://drone.jfmonty2.com/api/repos/jfmonty2/drone/builds/$DRONE_BUILD_NUMBER/promote?target=runner-build
+        else
+          echo 'Runner is already up to date.'
         fi
 
 volumes:
@@ -120,9 +137,54 @@ steps:
       - echo $REGISTRY_PWD | docker login -u drone --password-stdin registry.jfmonty2.com
       - docker push registry.jfmonty2.com/drone-server:latest
 
-
 volumes:
   - name: docker-socket
     host:
       path: /var/run/docker.sock
 
+---
+kind: pipeline
+type: docker
+name: runner-exec
+
+trigger: 
+  event: 
+    - promote
+  target:
+    - runner-build
+
+steps:
+  - name: docker-build
+    image: docker:latest
+    volumes:
+      - name: docker-socket
+        path: /var/run/docker.sock
+    commands:
+      # get version number
+      - apk add curl jq
+      - RUNNER_VERSION=$(curl https://api.github.com/repos/drone-runners/drone-runner-exec/releases | jq -r '.[0].tag_name')
+      # get the binary
+      - cd runner-exec
+      - curl -L https://github.com/drone-runners/drone-runner-exec/releases/latest/download/drone_runner_exec_linux_amd64.tar.gz | tar xz
+      - >
+        docker build
+        -t registry.jfmonty2.com/drone-runner-exec:latest 
+        --label drone_runner_version=$RUNNER_VERSION
+        .
+
+  - name: deploy
+    image: docker:latest
+    volumes:
+      - name: docker-socket
+        path: /var/run/docker.sock
+    environment:
+      REGISTRY_PWD: 
+        from_secret: registry_pwd
+    commands:
+      - echo $REGISTRY_PWD | docker login -u drone --password-stdin registry.jfmonty2.com
+      - docker push registry.jfmonty2.com/drone-runner-exec:latest
+
+volumes:
+  - name: docker-socket
+    host:
+      path: /var/run/docker.sock

runner-exec/Dockerfile

@@ -0,0 +1,9 @@
+FROM alpine:latest
+
+RUN echo 'http://dl-cdn.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories
+RUN apk update --no-cache
+RUN apk add --no-cache git curl jq yq python3 docker-cli
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
+COPY ./drone-runner-exec /bin/
+CMD ["drone-runner-exec"]