Scripts: descriptive cleanup_resources.sh on host

docker/setup_host/cleanup_resources.sh

@@ -16,18 +16,34 @@
 # limitations under the License.
 ###############################################################################
 
-if [ ! -z ${DOCKER_IMG} ]; then
-  echo "This script is expected to be run on host instead of the container."
-  echo "Please exit."
+if [ -f /.dockerenv ]; then
+  echo "Oops, this script is expected to run on host rather than from within container."
   exit 1
 fi
 
 # Credit to https://gist.github.com/bastman/5b57ddb3c11942094f8d0a97d461b430
-echo "Cleanup containers..."
-docker rm $(docker ps -qa --no-trunc --filter "status=exited")
+exited_containers="$(docker ps -qa --no-trunc --filter "status=exited")"
+if [ -z "${exited_containers}" ]; then
+    echo "Congrats, no exited docker containers found."
+else
+    echo "Exited containers found, cleanup ..."
+    docker rm ${exited_containers}
+fi
+
+dangling_images="$(docker images --filter "dangling=true" -q --no-trunc)"
+if [ -z "${dangling_images}" ]; then
+    echo "Congrats, no dangling docker images found."
+else
+    echo "Dangling images found, cleanup ..."
+    docker rmi ${dangling_images}
+fi
 
-echo "Cleanup images..."
-docker rmi $(docker images --filter "dangling=true" -q --no-trunc)
+dangling_volumes="$(docker volume ls -qf dangling=true)"
+if [ -z "${dangling_volumes}" ]; then
+    echo "Congrats, no dangling docker volumes found."
+else
+    echo "Dangling volumes found, cleanup ..."
+    docker volume rm ${dangling_volumes}
+fi
 
-echo "Cleanup volumes..."
-docker volume rm $(docker volume ls -qf dangling=true)
+echo "Docker cleaning up finished."