added changes from master

Dockerfile

@@ -33,4 +33,4 @@ RUN touch /var/log/cron.log
 WORKDIR "/"
 
 ENTRYPOINT ["/entry.sh"]
-
+CMD ["tail","-fn0","/var/log/cron.log"]

config.yml

@@ -0,0 +1,21 @@
+schemaVersion: '2.0.0'
+commandTests:  
+  - name: "restic package installation"
+    setup: [["/entry.sh"]]
+    command: "which"
+    args: ["restic"]
+    expectedOutput: ["/bin/restic"]
+fileExistenceTests:
+- name: 'log directory exists'
+  path: '/var/log'
+  shouldExist: true
+- name: 'cron log file exists'
+  path: '/var/log/cron.log'
+  shouldExist: true
+- name: 'backup script exists'
+  path: '/bin/backup'
+  shouldExist: true
+metadataTest:
+  volumes: ["/data"]
+  entrypoint: ["/entry.sh"]
+  cmd: ["tail","-fn0", "/var/log/cron.log"]

docker-compose.test.yml

@@ -0,0 +1,9 @@
+version: '2'
+
+services:
+  test:
+    image: gcr.io/gcp-runtimes/container-structure-test
+    command: ["test", "--image", "restic-backup", "--config", "config.yml"]
+    volumes:
+      - ./config.yml:/config.yml
+      - /var/run/docker.sock:/var/run/docker.sock

entry.sh

@@ -43,4 +43,4 @@ crond
 
 echo "Container started."
 
-tail -fn0 /var/log/cron.log
+exec "$@"